HDTenEightyP/NetNews huggingface dataset:
From: ai598@cleveland.Freenet.Edu (Mike Sturdevant)
Newsgroups: rec.motorcycles.dirt
Subject: Re: Homebrew Voltage Regulator?
Date: 22 Nov 1992 23:36:28 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: ai598@cleveland.Freenet.Edu (Mike Sturdevant)
NNTP-Posting-Host: slc10.ins.cwru.edu


In a previous article, carney@iccgcc.decnet.ab.com () says:


>
>
>Ask "Go Fast " Mike , I think he put  one on an XL250 a few  months
>ago. He couldn't figure why his RS meter didn't measure 12v...
>He had it on DC!!!!
>

	And my buddy Mark had to tell the whole world. 

Didn't see ya at the Trial last weekend - snow scare ya off?


>
>
>
>
>
-- 
Go fast. Take chances.

	Mike S.
From: kenm@array.com (Ken Murphy)
Newsgroups: rec.motorcycles.dirt
Subject: Re: winter riding
Date: 18 Nov 92 14:19:29 GMT
Distribution: na
Organization: Array Microsystems, Colorado Springs, CO. USA
X-Newsreader: TIN [version 1.1 PL6]

Cy (cmhg1010@uxa.cso.uiuc.edu) wrote:
: I like riding my bike and plan to do it all winter long, snow
: ice, sleet, whatever.  I recently saw a posting about changing
: the jet for cold riding.  (Sometimes it gets -20F here)
: 
: Do I need to do this for a Yamaha DT250 '79?  Also, does this
: involve going to the dealer and asking for a cold kit or something?

You'll need to rejet the bike both on the pilot and main and probably
on the needle.  Cold air is denser than warm air.  I doubt there
is a 'cold kit'.  You'll just have to learn a little `bout jetting.

: 
: Another question.  HOW DO I GET MORE POWER ON THIS BIKE?  Do I
: just need a bigger bike, or can I do something to the carb?
: Any low budget ideas?

Never owned/ridden a DT but there are various ways of eeking more power
out of just about any bike.  There's an old saying about racing.

Speed is just a matter of money, how fast do you want to go?

: Also, I never hear mention of DT's on this net.  Are they just bad
: dirt bikes or are they not even considered dirt bikes?  I only

The DT's were the forerunners of todays dirt bikes.  I wouldn't say they
weren't considered dirt bikes.  Good is a relative term.  What do you 
want to do?  I doubt you would be competitive in the local 250 B class 
but it may be perfect for the trail riding somebody else wanted to do.

: Cy Herring


  O                    Ken Murphy aka kenm@array.com              President RMEC
 <M> MerfMan          DoD #0479      '92 KTM 250 EX/C              Member COHVCO
_/ \_                 Race Now Party Later Racing Team                AMA 406077
Disclaimer: _I_ don't believe what I said, why should you?              SRAC 886
                   *******  Support Project Stealth ******
Newsgroups: rec.motorcycles.dirt
From: jjb@dtc.hp.com (Jim Brewer)
Subject: Re: Parts sticker shock
Date: Fri, 20 Nov 1992 00:38:41 GMT
Organization: HP Design Technology Center, Santa Clara, CA
Keywords: legal robbery

In article <1egoc5INNrvn@male.EBay.Sun.COM> checksix@flyboy.EBay.Sun.COM writes:
>
>The damage came to $166.00 big ones!!!!

  I can relate.

>Well, I lobe my CR-500 red rocket but, that new 250 YZ shure looks nice.
>A top end job for that one ONLY costs $120 bucks.  What a deal.

  Yeah, but how often do you need a full top end for the CR?  And what would
a real long sand wash be like on a 250 after having a 500?

Newsgroups: rec.motorcycles.dirt
From: cooper@kdx200.enet.dec.com ()
Subject: Re: '87 KDX200 Inquiry
Reply-To: Cooper@KDX200.enet.dec.com
Organization: DIGITAL Equipment Corporation
Date: Wed, 18 Nov 1992 21:32:04 GMT


>	Hmm.. maybe.  Forgive my 4-stroke-biased ignorance, but what do mean
>by "port it" ?  

Have a tech sit your jug on a flow bench and start grinding !!  Knowing that 
a 2 stroke cylinder has intake, transfer and exhaust holes in the cylinder
wall, and the piston traveling up and down in the bore is the "valve", means
you can alter the port timing with a grinder and a flow bench.  In a nut shell,
you get more top end power by making the exhaust port taller and wider.  You 
get low-end from making it shorter and narrower.  Knowing HOW MUCH to gring out
and where to grind is the art...Pay someone for it.

>Does this have to do with modifying the cylinder, er, intake
>ports ?  I may just do this if I can figure out how, or who to send it to,
>how long it takes, how much it costs, etc.

This is something that I would NOT recommend you do yourself.  All the after-
market places will port your cylinder and modifiy your head or cases (some
times) for $100-$300.  You send 'em you top end, and they do the work and have 
it back to you within a couple weeks.  Porting is the single most effective
means of getting the most ponies from you motor - period.

You can port a motor for lots of torque, lots of horsies, midrange, or whatever.
In my estimation, the BEST kind of port job is a "Match, clean  and spec of
your motors.  Just clean it u, and make no  radical changes that may effect
reliability.

>	Thanks for the advice on the other items, too.
My pleasure.  Hope I was helpful.  :)

jc


+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                    Jeff Cooper - Cooper@KDX200.enet.dec.com
          Digital Equipment Corporation - Colorado Springs, Colorado

                            Thats *DOCTOR* KDX200"
                                   To YOU!!

President - DIGITAL Equipment Corp. Trail Riders Assn. (DECtrail)
Rocky Mountain Enduro Circuit
AMA
MIDI Rack Puke

       No one cares about my stupid views and opinions, so why bother??
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Newsgroups: rec.motorcycles.dirt
From: dunne@rtsg.mot.com (Jim Dunne)
Subject: Re: winter riding
Organization: Motorola Inc., Cellular Infrastructure Group
Distribution: na
Date: Mon, 16 Nov 1992 16:13:13 GMT

Mike Baxter writes:
>Cy writes:
>Unfortunately I can't tell much about winter set-up or how to get more power
>out of your DT250.  Modern 125's make more horsepower than your bike.  What
>>Also, I never hear mention of DT's on this net.  Are they just bad
>>dirt bikes or are they not even considered dirt bikes?  I only
>Well Andy owns a '78 DT125 and we use it for our pit tranportation at the

    Mike's right, they're reliable, great bikes.  I learned to ride on
    a friend's (same friend with the H1 and lots of others) '73
    DT125A.  It had electric start (does your 250?) which added 17 lbs.
    I think!  It was a bit heavy, but Mike did a good job of
    enduro-izing.  Nicer bars, rubber, Preston Petty fenders (are those
    still around?), etc.  He'always weighed quite a bit more than me,
    and he cracked the frame from jumping it too hard!  Fortunately
    he's a good welder, and mechanic.

    As for more power... that's a toughie.  Baxter's right, you'll have
    a hard time getting more out of it.  If an aftermarket exhaust pipe
    or silencer could be made to fit, that'd be a start.  Boyesen reeds
    maybe?  Don't know if they go back that far, but it's a cheap mod...

    Does yours have dual plugs (one spare?)  That's another feature I
    remember, and we used it now and again.

    Maybe that bike's the reason I am primarily a dual-sport rider today.

--
   Jim Dunne   dunne@rtsg.mot.com    ...uunet!motcid!dunne   Northern IL, USA
    --<{ TEAM STRANGE -- street / dirt / lake / snow / ice  LOCO-MOTION }>-- 
Organization: Senior, Electrical and Computer Engineering, Carnegie Mellon, Pittsburgh, PA
Newsgroups: rec.motorcycles.dirt
Date: Mon, 16 Nov 1992 23:56:59 -0500 
From: "Russell E. Hoffman, II" <rh2y+@andrew.cmu.edu>
Subject: Re: winter NON-riding :(

Excerpts from netnews.rec.motorcycles.dirt: 16-Nov-92 Re: winter
NON-riding  :( by frampton@skitzo.dseg.ti. 
>   Don't know if it makes much difference but, get the bike up on a crate
>   to relieve the suspension.   You might also shoot the tires with Armorall
>   to keep them from dry rotting.  Thats something I forgot to do and my

Umm... right idea, wrong direction. Unless they've changed the formula
lately, Armor-all has alcohol in it, which tends to actually dry out
rubber and vinyl. You probably want to use something like Son-of-A-Gun 
or something similar. Wonder if mineral oil would work as well?

>   nobs showed up with cracks on the sidewalls.  My clutch plates oxidized.
>   I probably should have flooded the case with oil which would have submerged
>   the seals.

Yeah, my Suzuki 125 used to do that, which was annyoing, because it
would start like that. So every Spring, I could count on firing up the
Zuke and having it take off on me until the clutch plates broke free
again!

Russell Hoffman                 | 1970 Split-Bumper Camaro SS
rh2y+@andrew.cmu.edu            | 406 Small Block   13.5:1 CR 
Carnegie Mellon University      | Tunnel Ram 2x650cfm 4bbl    STREET DRIVEN
---------------------------------------------------------------------------

-rwx        1 joe_user                   806 May  1 23:38 file

r - indicates you can look at the file
w - indicates file can be hosed
x - indicates file contains bugs

From: scottt@hpmwtd.sr.hp.com (Scott Trosper)
Date: Thu, 19 Nov 1992 21:30:27 GMT
Subject: Idaho riding questions
Organization: HP Santa Rosa Site (SRSD MWTD)
Newsgroups: rec.motorcycles.dirt

I will be transferring to Boise Idaho near the first of the year and would like
to know what to expect as far as off-road riding in the area.  I've been 
keeping a close eye on the events section in Cycle News, but I have not seen
many events in Idaho.  Any one from up that way that could fill me in on the
riding and racing opportunitys in the region?  Any info on off-road clubs 
in the area would also be appreciated.

Happy Trails,
Scott

-------------------------------------------------------------------------------
Scott Trosper
work: Hewlett Packard                after work: 1988 Husqvarna 510XC (DP bike)
      Microwave Technology Division              1991 Husqvarna 125WXE
      1412 Fountaingrove Pkwy  1USE              1969 Triumph T120R (project)
      Santa Rosa, CA 95403  (707) 577-4299  
      scottt@sr.hp.com
-------------------------------------------------------------------------------
From: checksix@flyboy.EBay.Sun.COM (Al Conte)
Newsgroups: rec.motorcycles.dirt
Subject: Re: Parts sticker shock
Date: 20 Nov 1992 17:31:49 GMT
Organization: Sun Microsystems, Inc.
Distribution: world
Reply-To: checksix@flyboy.EBay.Sun.COM
NNTP-Posting-Host: flyboy.ebay.sun.com
Keywords: Yeah but!


> Yeah, but how often do you need a full top end for the CR?  And what would
>a real long sand wash be like on a 250 after having a 500?

I hear you but, we don't got no sand washes around here.
The only place I would be cuss'in would be on some of our nasty ass, sandy, 
rutty, hillclimbs.

I got some more news for ya, todays porting that comes "stock" on todays
dirt sleds is pretty radical.
I doubt that anyone can go more than 1 year's riding time before needing 
at least a ring job.


Al
From: checksix@flyboy.EBay.Sun.COM (Al Conte)
Newsgroups: rec.motorcycles.dirt
Subject: Re: CR500 jetting in Montana
Date: 19 Nov 1992 18:55:13 GMT
Organization: Sun Microsystems, Inc.
Distribution: world
Reply-To: checksix@flyboy.EBay.Sun.COM
NNTP-Posting-Host: flyboy.ebay.sun.com

>Question: How do I set the idle for both situations, stopped out of
>gear and (clutch in) downhill sections of trail?

OK, this may sound weird but, it works.

Put back the stock slow jet.
Run the needle at the mid clip position.
Change your pre-mix ratio to somewhere between 32 and 40 to 1.
Lighten up on the filter oil saturation, if it looks overcoated to much.
Then go have fun riding.


Al
From: ryang@drycas.club.cc.cmu.edu (Robert H. Yang)
Newsgroups: rec.motorcycles.dirt
Subject: '87 KDX200 Inquiry
Date: 16 Nov 92 07:37:30 GMT
Article-I.D.: drycas.1992Nov16.123730.2581
Reply-To: ryang@drycas.club.cc.cmu.edu

Hi,

	I just bought a bone-stock '87 KDX200.  I was wondering what kinds
of modifications, adjustments, tweaking, and, uh, other extra goodies you
all have done to yours.  I was curious, as down the road I may be interested
in doing similar things to mine.  Of course, I will have to get some riding
time on it first :-)

Rob
--
Rob Yang (Pittsburgh, PA, U.S.A) RYANG@DRYCAS.CLUB.CC.CMU.EDU
'92 CBR600F2 (Hon) "It hisses on snakes."   AMA 642916 DoD 0593 FSSNOC 1721
'79 XT500 (The Bitch)        '90 Plymouth Laser RS (Sweetie)
                       '87 KDX200 (Name That Bike)
Newsgroups: rec.motorcycles.dirt
From: cooper@kdx200.enet.dec.com ()
Subject: Re: another question of KDX exhaust...........
Reply-To: Cooper@KDX200.enet.dec.com
Organization: DIGITAL Equipment Corporation
Date: Wed, 18 Nov 1992 17:28:09 GMT


>	Then I asked him if he has ever heard of people modifying the baffles
>in the exhaust?  and he said "yes, buuuuuuuuuuuuuuuuuuut its illegal with a
>steep fine, and it messes up the back pressure"
		^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Sure, it changes your back pressure a little.  What it really does is
LET YOUR MOTOR BREATH A LITTLE!!  Common sense tells me that if you have 
a MX sock jammed in your yap, and you can't breath, then removing the
sock will help.  :)  :)  You  will need to re-jet if you diddle your
exhaust at all...  I *wouldn't* say "Messes up your back pressure"...
It just changes it.

>		Here is where the question is..... is this true?
>		I read it gave more power (any ideas on how much?)?

I wouldn't guess how much you gain, but maybe a pony or two...  :)
After all - Horsepower is a funny thing.  Kawasaki says that a KDX200
makes 37 horsepower (Wagagagagagaaaa), so...



+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                    Jeff Cooper - Cooper@KDX200.enet.dec.com
          Digital Equipment Corporation - Colorado Springs, Colorado

                            Thats *DOCTOR* KDX200"
                                   To YOU!!

President - DIGITAL Equipment Corp. Trail Riders Assn. (DECtrail)
Rocky Mountain Enduro Circuit
AMA
MIDI Rack Puke

       No one cares about my stupid views and opinions, so why bother??
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
From: carney@iccgcc.decnet.ab.com
Newsgroups: rec.motorcycles.dirt
Subject: Re: Homebrew Voltage Regulator?
Date: 18 Nov 92 13:35:57 GMT
Followup-To: rec.motorcycles.dirt

In article <eastman-171192144724@47.208.134.18>, eastman@bnr.ca (Gordon Eastman) writes:
> Bulbs don't last long in my KDX powered bike. I have to install new ones
> before each enduro to pass inspection.
> 
> The recent thread on KDX200 mods mentioned that the '92 KDX200 has a
> voltage regulator to prevent this problem. So I called the local Kawasaki
> dealer. $90 for the part! And he said it with a straight face :-).
> 
> I suspect that it is $2 of components in a waterproof package. Anyone with
> an electronics background know how to roll your own? Or know of a more
> reasonably priced unit from a different motorcycle?
> 
> Gordon   1990 KX200
> ____________________________________________________________________________
> Standard disclaimer: opinions are mine, not BNR's
    The output from these lighting coils are usually AC and
the regulators used are not like that of a car, i.e.not controlling
field current in response to load.
     Typically they come in the form of "shunt" type elements that mearly
"blow off" the excess power (in the form of heat) into ground.Although
you could put in some back-to-back Zener diodes (of adequate power) to 
do just this (they tend to clip the tops of the waveform voltage).
But I allways just but a universal type from


  a snowmobile type
place like Shade Tree or Dennis Kirk 

They come in 12v or 6v for about $15-$25

Pretty easy to install, single wire to "hot" side of L coil


Ground to chassis (sometimes a wire but often just the case)

typical package is a 2"x2"x 3/4" Zinc type cube ,potted material
on top. Mounting through a  ~ 1/4" hole through the middle.



Ask "Go Fast " Mike , I think he put  one on an XL250 a few  months
ago. He couldn't figure why his RS meter didn't measure 12v...
He had it on DC!!!!


                                            Hope this Helps


                                            Mark


I love the smell of 2-Stroke in the morning...


                                            ... it smells like Victory!!!
Newsgroups: rec.motorcycles.dirt
From: eastman@bnr.ca (Gordon Eastman)
Subject: Homebrew Voltage Regulator?
Followup-To: rec.motorcycles.dirt
Organization: Bell-Northern Research
Date: Tue, 17 Nov 1992 19:48:21 GMT

Bulbs don't last long in my KDX powered bike. I have to install new ones
before each enduro to pass inspection.

The recent thread on KDX200 mods mentioned that the '92 KDX200 has a
voltage regulator to prevent this problem. So I called the local Kawasaki
dealer. $90 for the part! And he said it with a straight face :-).

I suspect that it is $2 of components in a waterproof package. Anyone with
an electronics background know how to roll your own? Or know of a more
reasonably priced unit from a different motorcycle?

Gordon   1990 KX200
____________________________________________________________________________
Standard disclaimer: opinions are mine, not BNR's
Newsgroups: rec.motorcycles.dirt
From: mtrhead@selway.umt.edu (Josh C Harmon)
Subject: CR500 jetting in Montana
Keywords: CR500 jettin
Organization: University of Montana
Distribution: usa
Date: Thu, 19 Nov 1992 17:59:18 GMT

I recently purchased an 88 CR500.  The bike is in excellent shape
except I had to replace the pipe.  I went with a DG pipe. 

Problem:   Jetting is off. (as I expected)  Because the bike 
ran too rich off idle I decreased the slow jet size from 58 to 55.
Now the idle is incorrect, if I have the idle right for 
downhill trail sections (I ride trails in Montana), the idle is way 
to high when the bike is stationary and out of gear.  Midrange and 
topend jetting seem right.

Question: How do I set the idle for both situations, stopped out of
gear and (clutch in) downhill sections of trail?  

Can any of you 2-stroke gurus help? :-)

Thanks in advance!

-- 
*** Josh Harmon *** 88 CR500 *** 88 GSX600 *** 
Newsgroups: rec.motorcycles.dirt
From: ramz@lanl.gov (Rick Ramsey)
Subject: Re: KTM 400cc LC4
Followup-To: rec.motorcycles.dirt
Organization: LANL
Distribution: usa
Date: Fri, 20 Nov 1992 23:00:56 GMT

The December 92 issue of Trail Rider has an article on the new 1993
KTM 400 LC4, including a black and white photo of the bike.  
The LC4 is one of KTM's 4-stroke off-road/enduro motorcycles.  The bike
is liquid cooled and comes with front and rear lights and an odometer.
The picture shows new plastic with hand holes under the rear of the seat
and a largish rear fender extension that hangs down like some street-legal
dual sport bikes (could be for license plate).  The radiator shrouds almost
completely cover what looks like a black gas tank peeping out the top 
similar to the KX 250.  The side stand is on the right side in the photo!
The first units are expected in January.

The specs as related in the article are:
  398cc engine w/Nikasil cylinder
  dual head pipes w/aluminum muffler
  five-speed wide-ratio transmission
  White Power shock and fat-top forks
  Metzeler Unicross tires
  2200cc oil capacity, oil in the downtube and engine sump
  dry weight of 248 lbs
  suggested retail price is $5429

For woods and moderate high-desert use, this bike looks like a better
bet than the new KLX 650 Kawasaki.  For us little guys, anyway. 8-)
..................................................................
Rick Ramsey  ramz@lanl.gov  Los Alamos, NM  505/662-2447 evenings.
Newsgroups: rec.motorcycles.dirt
From: bored-out-of-my-skull <clane@magnus.acs.ohio-state.edu>
Subject: Hey hey hey!!!!!!!!!!!!!
Organization: The Ohio State University
Date: Mon, 23 Nov 1992 16:56:59 GMT



Merf U and the sales rep were correct!  I took apart my silencer, actually i
pulled out the spark arrestor and after looking around and a few screw driver
taps combined w/ a flashlight, I concluded that i didnt have to repack my
silencer.  Oh well!  another thing i dont have to worry about!

OK so on to next comment,   

My stock silencer is rated at 82 db,  Does anyone know what the Answer SA (i
believe that is the modle) db rating is?  I was looking thru the Dennis Kirk
catolog last night and i think i am gonna go with that one and combine it
with a pipe.

Any pipe or silencer/spark arrestor  Recommendations?


later               Sponsered by: Chuck's Bar, Barbeque, Bed and Breakfast
chuck!                              "Breakfast is FREE at my restaurant!"
Newsgroups: rec.motorcycles.dirt
From: wardman@gandalf.ca (Russel Wardman)
Subject: Re: winter riding
Organization: Gandalf Data Ltd.
Date: Mon, 23 Nov 1992 15:02:48 GMT

In <1992Nov21.002458.25783@sbcs.sunysb.edu> srabo@csws19.ic.sunysb.edu (Sebastian Rabo) writes:


>	On the cold air == lean mixture issue, why would a motorcycles 
>carburation be more greatly affected than the millions of carburated cars
>that manage just fine through winter without rejetting. Also I wonder if
>the increased heat transfer on an air cooled bike during cold weather would
>actually cause it to run cooler. 

   I've learned this from experience, in my four or five years of ice racing.
I've seen other people melt down because they didn't rejet and I've seen
that to keep my spark plug the right colour, I have to increase the jet size
when it gets colder.

Based on this data, I've come up with a few theories.

At a given rpm a 2 stroke has twice as many power strokes as a 4 stroke,
it therefore has twice as much heat to dissipate. This means it is 
operating much closer to the edge and is therefore easier to push it
over that edge. 

Engines are jetted from the factory for their expected application. That
means they will be jetted so they aren't too lean at the highest altitude/
coldest weather they are expected too see. Can anyone confirm if cars are
jetted differently based on the area they are being shipped to? Since dirt
bikes are expected to be run in the summer, they won't come from the factory
with winter jetting, although they do seem to play it safe and jet them
slightly fat for summer riding. 

In our quest for more power, many of us have leaned our jetting in the 
summer, something we don't tend to do with our trucks and cars. Once 
again, this puts them closer to that edge.

I have to wonder if the people argueing this point are doing so because
they want to find a reason to be lazy and not change there jets. rejetting
is only a 10 minute job; whats the problem. Even in the summer, rejetting 
should be a common thing to try and find hidden, cheap power.

Russell 
-- 
**         Russell Wardman         ** 78 TT-500 (for sale)             **
**          613-723-6500           ** 84 Turbo 750 KAWASAKI (for sale) ** 
**                                 ** 90 KX 500 KAWASAKI               **
**      (rwardman@gandalf.ca)      **                                  **
From: mcclend@hpnmdla.sr.hp.com (Mike McClendon)
Date: Thu, 19 Nov 1992 16:33:04 GMT
Subject: Re: Homebrew Voltage Regulator?
Organization: Hewlett-Packard, Santa Rosa, CA