HDTenEightyP/NetNews huggingface dataset:
Newsgroups: rec.motorcycles.dirt

In rec.motorcycles.dirt, wardman@gandalf.ca (Russel Wardman) writes:

> What does changing the mass of fluid (gas) in the tube do? If the height  
> the fluid has to be raised in the tube is reduced from 2cm to 1.8cm this 
> will reduce the mass of the fluid column by 10%. The vacuum you then have 
> to apply to maintain the fluid at the top of tube would then be reduced
> by 10%. You're mixture would therefore be 10% richer.
> 
> Somehow I doubt that my assumptions of linear relationships are correct,
> but hey, I never took fluid dynamics. 
> 
> Does this make any sense ??

No.  I'd have to say that the head losses of the fluid traveling through
the small jet passage is >>> the change in head by raising the fluid level.

I have a couple of suggestions related to gas in the bowl.  My XR used to
have a real blubbering (Shamu, whale, get it? ar ar ar...) problem when
coming off of jumps or when bouncing through major boulder fields.  I
hypothesized that the carb was starving when the fuel bounced away from the
jet.  

I build a small baffle plate that is pressed into the bowl about 1/2 inch
from the bottom.  There's a couple of cutouts for the jets.  It seemed to
cure 80% of the blubbering problem.  If anyone else with an XR600 is
interested, I can trace my baffle and fax you a copy.  

Another cure for the air time hesitation has to do with the overflow tube.
The factory MX riders discovered this fix on super cross tracks.  Normally,
the overflow tube exits the carb and is routed immediately downward.
Neutral g's while in the air cause fuel to start out the overflow/vent
tube.  When you land, the carb must struggle to "siphon" the fuel back up
this tube before it can vent freely.  

The fix for this problem was to re-route the overflow/vent  tube.  As soon
as it leaves the carb, route it upward.  I believe that they ran it up the
frame backbone.  After traversing  upward a suitable  distance, the end of
the tube should be routed back downward to keep out dirt.  I haven't tried
this yet, but plan on installation this spring. 

-Jeff Deeney-  KotD #0000  DoD#0498    NCTR    '88 XR600-Shamu   
jld@hpfcpe.fc.hp.com       AMA#540813  COHVCO  '81 CB750F-Llamaha 
We don't stop riding because we get old, we get old because we stop riding.
Newsgroups: rec.motorcycles.dirt
From: dunne@rtsg.mot.com (Jim Dunne)
Subject: Re: Another semester almost gone!
Organization: Motorola Inc., Cellular Infrastructure Group
Date: Thu, 17 Dec 1992 16:32:03 GMT

frampton@skitzo.dseg.ti.com writes:

>  Almost free!!!!  You "Texas Glitter Boys" had better be ready to
>  roost pretty pronto.  My last final will be over at 11pm tonight!

    Oohhhhhh, duuuude, you think school has done it to you.  Wait 'til
    that kid comes (or has he/she already?)  Sure, you'll be at Mosier
    and King's Creek both Saturday AND Sunday riding with Andy and
    Mike... NOT.  Man I steered *way* far away from that prospect about
    4 years ago; otherwise I'd still be living in Dallas and wouldn't
    remember what a dirt bike *looked* like.  I hope you can be an
    exception and end up with that open classer sometime soon.  After
    all, one has to have his priorities!!!

    =B^)

    <you didn't marry my ex-girlfriend, did you?  No, can't be, you're
     not the DERELICT type :>
--
   Jim Dunne   dunne@rtsg.mot.com    ...uunet!motcid!dunne   Northern IL, USA
    --<{ TEAM STRANGE -- street / dirt / lake / snow / ice  LOCO-MOTION }>--
From: dlawren@salsa.abq.bdm.com (David P. Lawrence)
Newsgroups: rec.motorcycles.dirt
Subject: Re: ATV's
Date: 16 Dec 92 00:54:48 GMT
Followup-To: rec.motorcycles.dirt
Organization: BDM International

In article <1gjrgkINNngp@usenet.INS.CWRU.Edu>, ged@po.CWRU.Edu (George E.
Davis) wrote:
>  
> Al Conte,
> 
>      Rec.spode hardly!
> 
> Stuff deleted. . .
>      Secondly, I race a Fourtrax 250R in regional motocross
> (Northern Ohio) and during late practice they run ATV's and
> the bikes together.  The bikes go first, with ATV's let loose
> about 10 seconds later.  On long (read not tight) outdoor type 
> tracks us faster "spodes" catch and pass all but the faster
> B and A riders.   Stuff Deleted. . .

Just an additional note. . .  I have a friend that races a modified 
Banshee in our desert racing series.  In most races, only the expert 
riders beat his lap times!  The "not so good" quad riders are sure
a BITCH to pass though!!!!  Can you say dusty road hogs?!
*-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-*
   David P. Lawrence                                 1991 XR-600
*-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-*
Newsgroups: rec.motorcycles.dirt
From: Kenneth_Ferguson@rand.org (Ken Ferguson)
Newsgroups: rec.motorcycles.dirt
Subject: Re: Landuse Mailing List
Date: 17 Dec 92 14:49:11 GMT
Organization: RAND
X-UserAgent: Nuntius v1.1a2



    Sorry Jeff, But if the Sahara club is involved I'm not interested.
I received an E mail a while ago from one of those misinformed morons
in regards to the District 37's attempts to fight land closure
legislation.

  This person rambled on about how the district had a do nothing policy
towards fighting land closure legislation. Obviously this person has not
been
around long enough to remeber the district's battles  with the BLM in the
70's to bring back Barstow to Vegas.


   So thank you very much but no thanks.

     Ken Ferguson
Newsgroups: rec.motorcycles.dirt
From: hubcap@hubcap.clemson.edu (System Janitor)
Subject: Re: CR500 and recreational riding -
Organization: Clemson University
Distribution: world       
Date: Wed, 16 Dec 1992 17:50:04 GMT

I absolutely *love* my (87) CR500 for motocross and fun riding. The only
time I found it to be unacceptable was when I entered a Hare Scrambles
once. It would have been great if I was more of a stud, but as it is,
I was pooped by about halfway through. By the end, I was trashed.

-Mike
Newsgroups: rec.motorcycles.dirt
From: baxter@epcot.spdc.ti.com (Mike Baxter)
Subject: Re: CR500 and recreational riding -
Organization: TI Semiconductor Process and Design Center
Date: Fri, 18 Dec 1992 22:58:27 GMT

In article <BzH4t8.FIM@news.dtc.hp.com> jjb@dtc.hp.com (Jim Brewer) writes:
>In article <1992Dec17.050301.24314@selway.umt.edu> mtrhead@selway.umt.edu (Josh Harmon) writes:
>
>  Just as an aside, a stock geared CR500 will go about 70 topped out.
>Last sunday I followed a friend of mine down a paved road (coming back from
>the bar at Clear Creek) on his '92 and he could only muster 70.

My stock '91 CR250 WFO in 5th run at ~70mph.  He must have only been in 4th.
Are you sure he was topped out.   

_____________________________________________________________________________
DoD #359                    '91  CR250 |         Mike Baxter   
AMA #607249                      #P61  |              
TCCRA  #P61  "Team D."                 |      baxter@spdc.ti.com
Pro Class	                       |
Texas Cross-Country racing series      |   Texas Instruments, Dallas Tx.   
50 miles of off-road Hell (FUN)        |  
_______________________________________|_____________________________________
Disclaimer:  The opinions expressed above are my very own, becuase 
             if they were worth anything TI would patent them.
Newsgroups: rec.motorcycles.dirt
From: aweaver@epcot.spdc.ti.com (Andy Weaver)
Subject: Re: springs
Organization: TI Semiconductor Process and Design Center
Date: Fri, 18 Dec 1992 21:15:12 GMT

In article <124510164@hpfcso.FC.HP.COM> jld@hpfcso.FC.HP.COM (Jeff Deeney) writes:
>
>With a stiffer front spring, you can push the front end into bigger holes
>and bumps without worrying about bottoming.  With softer springs I worked a
>lot harder to unload the front end for the big bumps.  This leads to
>blistered hands.  As someone else mentioned, the drawback to stiffer springs 
>is that they will hammer your arms and shoulders more on the chatter bumps. 

This is just what I wanted to hear.  You are describing my problems pretty
good.  I find myself yanking back hard before big slams to try to unload
as much as possible.  This takes tons of energy and leaves bilsters, 
especially at Dowdy Ferry where the track is almost all hard hits all the
way around.  I don't think that the chatter bumps will bother me too much
with the stiffer springs.  It is soft enough now that it doesn't rebound
quick enough while going through the chatter, and this will sometimes send
the front end into a head shake.  I'm hoping that with the stiffer springs
the front end won't be hopping around as much so that I can keep it going
straight through the rough stuff.  I'll gladly take more arm punishment
on the chatter if it will go straight through it and then let me slam those
square edge whoops when I need to without a lot of pulling back to take the
hit.

>I prefer a softer rear suspension to soften the blows on the spinal column.
>For the smaller bumps where you are sitting down, you want a soft spring
>anyway.  For the larger bumps, power can compensate for soft suspension.
>By landing with the gas on you can unload the suspension, effectively
>increasing resistance to bottoming. This is true for standard bikes.  I'm
>not sure if A-trak does away with this benefit.  
>
The rear suspension on my bike is set up pretty good now, so I'll leave it
the same and just tweek the rebound and compression if needed.

Landing with the power on definately smoothes things out.  Try to let the
clutch out smooth just as you are landing.

What is an A-trak?

Andy


Newsgroups: rec.motorcycles.dirt
From: eastman@bnr.ca (Gordon Eastman)
Subject: Re: springs
Followup-To: rec.motorcycles.dirt
Organization: Bell-Northern Research
Date: Thu, 17 Dec 1992 17:23:52 GMT

In article <1992Dec17.160929.170@nsisrv.gsfc.nasa.gov>,
tim@intrepid.gsfc.nasa.gov (Tim Seiss) wrote:
> 
> >Andy Weaver (aweaver@epcot.spdc.ti.com) wrote:
> >: Because of excessive front end dive and general softness, I ordered
> >: a stiffer set of fork springs from Kawasaki.  
> >: 
> >: I am curious if I need to also change the rear spring to balance out
> >: the stiffer front spring rate.  A friend at the Kawasaki shop where I
> >: ordered them said that it usually wasn't necessary.  Does anyone have
> >: experience with changing fork spring rates and it's affect on overall
> >: suspension performance?
> >: 
> >: Andy
> 
> However, if you get stiffer springs, you might want to get a re-valve job
> in your forks to get more damping.  The damping is there to work against
> the energy stored up by the spring.  If you increase the energy potential
> of the spring (i.e. stiffer spring) without increasing the damping, you
> might end up with a fork that has too little rebound damping and will
> top-out off jumps and bumps (like a catapult).
> 
> -Tim Seiss

You will likely need more rebound and LESS compression damping with stiffer
springs. The basic problem with most stock Japanese forks is too light a
spring which they try to correct with extra compression damping and spring
pre-load. The result is a harsh fork that still bottoms!

Gordon   1990 KX200
____________________________________________________________________________
Standard disclaimer: opinions are mine, not BNR's
Newsgroups: rec.motorcycles.dirt
From: frampton@skitzo.dseg.ti.com
Newsgroups: rec.motorcycles.dirt
Subject: Arenacross Series!
Date: 15 Dec 92 08:57:58 CDT
Organization: Texas Instruments Component Test Facility


   I just got an entry form in the mail (a few others should as well).
   for the "AMA Nat ARENACROSS Series".  If you've never been to one
   of these... Its a scaled down SUPERCROSS and almost as much fun to
   watch.  Races are held in coliseums not stadiums.

   The forms says (in short) to expect:

     50' doubles, triples, hairpins and whoops. AMA sanctioned and 
     points accumulation.  125-250 payout per class per night is
     1st - $1000 through 14th - $100 (expert?).  Dash for cash!

     Race format: Expert races are Fri & Sat. Amateur races are Sun.
                  All riders will compete in heats. Riders who do not
                  transfer directly to main event will ride a semi-final
                  to try and make the final.  Finishing position in 
                  final will count as overall finish for trophies/purse.

     Classes: 125cc,250cc  Expert,B,C,D
              250cc (over 25 "Andy?"),(over 30)
              65cc (7-11)
              85cc (7-11),(12-15),(12-13),(14-15),Beg(12-15)
              50/60cc Modified
              50cc Stock

     Dates & location:  Jan 1-3     Ft. Worth, Tx
                            8-10    San Francisco, Ca
                           22-24    Guthrie, Ok
                        Feb 5-7     Indianapolis, In
                           12-14    Sioux Falls, Sd
                           26-28    Denver, Co
_________________________________________________________________________
mark frampton....O/30 NOVICE   |    I just broke a screw off into infinity.
X-Country?!? What next?!?      |      Anyone got a real long/short easyout?  
frampton@skitzo.dseg.ti.com    |    If you'll try it, I'll try next. NOT!
                               |
From: oconnor@eng.umd.edu (Mark O'Connor)
Newsgroups: rec.motorcycles.dirt
Subject: Re: wider footpegs
Date: 16 Dec 92 23:12:40 GMT
Organization: College of Engineering, Maryversity von Uniland, College Park
Originator: oconnor@coffee.eng.umd.edu


aweaver@epcot.spdc.ti.com (Andy Weaver) asks:
>Does anyone out there use wider footpegs, and
>are they an advantage?

I widened my pegs at the beginning of last season.  I think this is
a matter of personal preference.  Some people may not like them
because rotating your foot is more difficult, but the factory
trend is to go wider than previous years.  It took me several
rides to feel comfortable on the new "running boards", but now
when I ride a std. peg, I hate it.  All my machines have now
gone to a peg 1+1/2 inch width.

*Mark OConnor      Aerospace Engineering      University of Maryland*
*'90 CR250R        AMA District 7 Vet #90     MB Racing Group       *
Newsgroups: rec.motorcycles.dirt
From: baxter@epcot.spdc.ti.com (Mike Baxter)
Subject: Re: CR250 vs. XR250
Organization: TI Semiconductor Process and Design Center
Date: Wed, 16 Dec 1992 21:36:51 GMT

In article <1992Dec16.152427.13871@nlm.nih.gov> masys@nlm.nih.gov (Dr. Daniel R. Masys) writes:
>- how does one learn to ride such a beast in a way that minimizes risk
>  of injury?  (No racing anticipated with it--i.e., signing up for a
>  beginner class moto was not what I had in mind, although being able
>  to view a MX course as another kind of trail to have fun with seems
>  within reason, and the local AMA courses do have practice days for
>  such stuff).

Just ride it sensibly.  You have already realized the difference in power.  



>- Are there any maintenance gotchas with the 1988 CR250, or things to
>  look out for beyond what the owner's manual says (analogous to snapping
>  the swing arm linkage on recent KX's)?  The owner's book is almost a
>  shop manual, with maintenance procedures and specs for all the systems
>  on the bike, and while its cold and wet we may disassemble the beast
>  and put it back together by book specs.  Anything special to look for
>  in terms of hidden damage?


I don't know of any particular defects on the '88 model.  The linkage bearings
need to be greased often if you ride in water.  The HPP power valve will gum-up
rather quikly as compared to other brands of bikes.  It is a pain to clean to.
Grease the head bearings while your working on it.  Other than that it should
be bullet proof.  The '88 CR is not much different than my '91 CR.  I suggest
you get a real shop manual for it.  

In your future I see you selling two XR's and getting another CR250.  


_____________________________________________________________________________
DoD #359                    '91  CR250 |         Mike Baxter   
AMA #607249                      #P61  |              
TCCRA  #P61  "Team D."                 |      baxter@spdc.ti.com
Pro Class	                       |
Texas Cross-Country racing series      |   Texas Instruments, Dallas Tx.   
50 miles of off-road Hell (FUN)        |  
_______________________________________|_____________________________________
Disclaimer:  The opinions expressed above are my very own, becuase 
             if they were worth anything TI would patent them.
Newsgroups: rec.motorcycles.dirt
From: jjb@dtc.hp.com (Jim Brewer)
Subject: Re: CR500 and recreational riding -
Date: Sat, 19 Dec 1992 00:34:25 GMT
Organization: HP Design Technology Center, Santa Clara, CA

In article <1992Dec18.225827.28037@spdc.ti.com> baxter@epcot.spdc.ti.com (Mike Baxter) writes:
>My stock '91 CR250 WFO in 5th run at ~70mph.  He must have only been in 4th.
>Are you sure he was topped out.   

  Yeah cause we were racing (I won!).

From: jld@hpfcso.FC.HP.COM (Jeff Deeney)
Date: Fri, 11 Dec 1992 19:55:01 GMT
Subject: Re: riding gear: what do I need?
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: rec.motorcycles.dirt

In rec.motorcycles.dirt, thompson@Apple.COM (Paul Thompson) writes:

> I'm just starting to ride in the dirt, and I'd like to know
> what kind of riding gear I should get.  I assume boots, a
> helmet, and goggles top the list.  For just plunking around,
> how good of a helmet do I need?  I've seen models from $50 to
> $200.  

For just plonking, you can probably get by with your street helmet.  Be
aware that there are a few disadvantages to using a street helmet.  Number
one, it will be quite a bit warmer. Number two, the lack of a visor makes 
riding into the sun more hazardous. 

>Also, what kind of armor should I get?  I assume I
> should have something for elbows and knees, but should I 
> spend the money on a chest protector?  

I'd strongly recommend a chest/back protector.  If I'd been wearing one 16
years ago, I wouldn't have this neat scar on my shoulder where the surgeon
tied everything back together. 

>Finally, how do I know if I need a kidney belt?

Let's see, do you have kidneys?  Kindney belts are a good idea to prevent 
detachment of your kidneys.  I even wear mine on long street rides.  

-Jeff Deeney-  KotD #0000  DoD#0498    NCTR    '88 XR600-Shamu   
jld@hpfcpe.fc.hp.com       AMA#540813  COHVCO  '81 CB750F-Llamaha 
We don't stop riding because we get old, we get old because we stop riding.
From: frampton@skitzo.dseg.ti.com
Newsgroups: rec.motorcycles.dirt
Subject: Re: More winter riding concerns (MTBE)
Date: 18 Dec 92 13:07:15 CDT
Organization: Texas Instruments Component Test Facility

> Between pipe changes, rejetting and winter riding, this fuel can
> prove very frustrating.  Maybe now I have an excuse to order that 55 
> gallon drum of race gas!

> -- 
> --- Josh Harmon -- 88 CR500R -- 88 GSX600F -- Disciple of DoD: #1137 ------
> ::: mtrhead@selway.umt.edu   To Bad, San Fran :(, The Cowboys are BACK! :::
> ---------------------------------------------------------------------------

  I'm sure that you would not see any real problem with running the
  high performance stuff as I didn't with my previous open bike, but
  I did run into a very disturbing experience when I went for a little
  more octane in the 125 (couple years ago).  On the way to a Fri. night
  MX, I stopped into a SuperFuels and figured a few more notches in the
  octane couldn't hurt.  What a mistake.....  My 125 didn't have the right
  volumes to handle it (IMHO).  Everytime I nailed it I was greeted with
  boooooooogggggg. I didn't DNF but I would just as well have.

  Moral?  Don't go try out new and exotic ideas just before a race.
From: baxter@epcot.spdc.ti.com (Mike Baxter)
Newsgroups: rec.motorcycles.dirt
Subject: Troy Lee Designs address
Date: 12 Dec 92 00:35:54 GMT
Organization: TI Semiconductor Process and Design Center

Troy Lee must be a drinking, partying kind of guy.  TROY LEE DESIGNS is 
on Wild Turkey Dr.   Corona, Ca.  Real nice people there.  I thought it was 
funny.  

_____________________________________________________________________________
DoD #359                    '91  CR250 |         Mike Baxter   
AMA #607249                      #P61  |              
TCCRA  #P61  "Team D."                 |      baxter@spdc.ti.com
Pro Class	                       |
Texas Cross-Country racing series      |   Texas Instruments, Dallas Tx.   
50 miles of off-road Hell (FUN)        |  
_______________________________________|_____________________________________
Disclaimer:  The opinions expressed above are my very own, becuase 
             if they were worth anything TI would patent them.
From: jerry@stratford.dab.ge.com (Jerry Szulinski)
Newsgroups: rec.motorcycles.dirt
Subject: baja 1000
Date: 15 Dec 92 13:33:26 GMT
Organization: GE Simulation & Control Systems. Daytona Beach, FL

What's the deal with the winner of Baja? According to Cycle News, a bike
won the overall, according to ESPN it was the Ford guys (glad I got both).
The latest CN (letters section) once again noted that the bike won 
overall so what's up with ESPN? Do they have a hard time believing 
"a little motorcycle" could beat "an American iron truck"? Actually,
it was a Ranger that beat all the full size trucks anyway. OTOH, 
I remember hearing something about bikes having to leave _way_ early
in the morning, before any other vehicles; that would mean the truck
covered the 1000 in less time since it got to the finish only a little 
bit after the top two bikes (one of which CN claims beat the truck).
I'll post the same article to wreck.autos.sport to see what kind of info
they got (don't worry, I'll try not to start another war of "our bikes
beat your cages...nahnah,nahnahnah").

Jerry S.
From: oconnor@eng.umd.edu (Mark O'Connor)
Newsgroups: rec.motorcycles.dirt
Subject: Re: More winter riding concerns (MTBE)
Date: 18 Dec 92 21:32:19 GMT
Organization: University of Maryland, College Park, MD
Originator: oconnor@coffee.eng.umd.edu


	Dr. Daniel R. Masys said:

   good information regarding MTBE considerations deleted...
>(I found out all of this stuff because my airplane is FAA approved for
>use of auto gas, but up there is not where you want to find out that
>MBTE causes engine problems).

Off the net subject, but, do you gas your bird with Exxon?
Does CP airport have auto gas readily available for birds?
Interesting.
-Mark
From: mcclend@hpnmdla.sr.hp.com (Mike McClendon)
Date: Thu, 10 Dec 1992 16:48:06 GMT
Subject: Re: Warning... may be offensive!
Organization: Hewlett-Packard, Santa Rosa, CA
Newsgroups: rec.motorcycles.dirt

Yeah, where is George?  The net isn't the same without his sage advice and
snappy wit!

When we don't hear from George for awhile, you start to worry:  did he go
too far this time with his CR500RR . . . is he stuck in orbit?  Did a croc
get him?  Or maybe one of those brown-mama watch-you-call-em super poisonous
snakes slither into his boots?  Perhaps, as a Queen's subject, he's just
deeply depressed and withdrawn over Charles and Di. . .

George, George, where are you ??

-- Mike

Newsgroups: rec.motorcycles.dirt
From: hart@cheshire (James A. Hart)
Subject: Re: CR250 vs. XR250
Organization: TRW Inc., Redondo Beach, CA
X-Newsreader: Tin 1.1 PL4
Date: Fri, 18 Dec 92 01:34:05 GMT

masys@nlm.nih.gov (Dr. Daniel R. Masys) writes:
: In article <1992Dec16.193449.17388@rtsg.mot.com> dunne@rtsg.mot.com (Jim Dunne) writes:
: >
: >     I want to know
: >    however, do any of you get that dreaded Honda headshake that still
: >    exists today (according to the magazines)? 
: >    Do XRs get it like CRs?
: >
: One of our local riding places has a headshake alley, where my (dearly
: departed) Yamaha dual sport used to go crazy with side-to-side fork
: oscillations.  The XRs never even wiggle, they just take it like they're
: on rails.  Guess this is another thing to "look forward" to on the CR.
: 
: Dan Masys
: masys@nlm.nih.gov
: 
: 
--
I keep hearing that XR's don't shake. Hmmmm.  I wonder what my '600's doing
then.  Maybe its a 'wobble'.  8-).

Name:        Jim Hart    N6JSS
InterNet:    hart@donald.etdesg.TRW.COM 
                         I'd rather be LANDSAILING!