Exhibit 10.7.1


THIS  PROMISSORY NOTE IS AND SHALL AT ALL TIMES BE AND REMAIN  SUBORDINATED  AND
SUBJECT IN RIGHT OF PAYMENT AND ENFORCEMENT, TO THE EXTENT AND IN THE MANNER SET
FORTH IN SECTION 11 OF THIS PROMISSORY NOTE, TO THE PRIOR PAYMENT IN FULL OF ALL
SENIOR DEBT, AS SUCH TERM IS HEREINAFTER DEFINED.


                                 PROMISSORY NOTE


   $1,500,000                 Houston, Texas               As of May 23, 2006

     FOR VALUE RECEIVED,  the undersigned,  TRADESTAR SERVICES,  INC. ("Maker"),
hereby unconditionally promises to pay to the order of LARRY M. WRIGHT ("Payee")
at 911 Creek Wood,  Houston,  Harris County,  Texas 77024, or such other address
given to Maker by Payee,  the principal sum of ONE MILLION FIVE HUNDRED THOUSAND
DOLLARS  AND NO/100  ($1,500,000.00),  in lawful  money of the United  States of
America,  together with interest  (calculated on the basis of a 360-day year) on
the  unpaid   principal   balance  from  the  date  hereof  until  maturity  (or
acceleration of maturity) at the rate of ten percent (10%) per annum.

     1. Definitions.  When used in this Note, the following terms shall have the
respective meanings specified herein or in the Section referred to:

     "Business  Day" means a day upon which  business is  transacted by national
banks in Dallas, Texas.

     "Default" has the meaning ascribed to it in Section 5 hereof.

     "Indemnification    Agreement"   means   that   certain    Assumption   and
Indemnification  Agreement of even date  herewith by and among Maker,  Tradestar
Acquisition  Sub,  L.L.C.,  The CYMRI  Corporation,  Payee,  Robert  G.  Wonish,
Franklin M. Cantrell, Jr., Petroleum Engineers, Inc. and Triumph Energy, Inc

     "Maximum  Rate"  means,  with  respect to the holder  hereof,  the  maximum
non-usurious rate of interest which, under all legal  requirements,  such holder
is permitted to contract for, charge, take, reserve, or receive on this Note. If
the laws of the State of Texas are applicable  for purposes of  determining  the
"Maximum  Rate," then such term means the "weekly  ceiling" from time to time in
effect under Texas  Finance  Code  ss.303.001,  as amended,  as limited by Texas
Finance Code ss.303.009.

     "Merger  Agreement" means that certain Agreement and Plan of Merger,  dated
of even date herewith,  by and among Maker,  Tradestar  Acquisition Sub, L.L.C.,
The CYMRI Corporation,  Payee, Franklin M. Cantrell,  Jr., Robert G. Wonish, and
Michael W. Hopkins.

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     "Pledge"  means that certain Pledge and Security  Agreement,  dated of even
date herewith, by and among Maker, Payee and Franklin M. Cantrell, Jr.

     "Senior  Debt" means all  amounts  outstanding  under the Credit  Agreement
dated May 23,  2006,  by and  among  Petroleum  Engineers,  Inc.  and  Tradestar
Construction Services,  Inc., as debtors, and Wells Fargo, as lender,  including
that certain  Revolving  Note  payable to Wells Fargo in the original  principal
amount of $5,000,000.

     "Senior Debt Event of Default"  means any event,  the  occurrence  of which
permits the termination or acceleration of the Senior Debt.

     "Wells Fargo" means Wells Fargo,  National  Association,  the lender of the
Senior Debt, and any of its assigns and any other holders of the Senior Debt.

     2.  Payment.  The  principal  and  interest  on this Note  shall be due and
payable in eleven (11) equal  monthly  installments  in the amount of THIRTY-ONE
THOUSAND EIGHT HUNDRED SEVENTY DOLLARS AND 57/100  ($31,870.57)  each, the first
monthly  payment in such amount  being due and payable on 1st day of June,  2006
and  thereafter  in the same amount of principal and interest on the same day of
each  calendar  month until eleven (11)  payments of principal and interest have
been made,  and on one (1) final  installment  due and payable on the 1st day of
May, 2007 in an amount equal to the then  outstanding  principal and accrued and
unpaid interest due on this Note.  MAKER  ACKNOWLEDGES AND AGREES THAT THIS NOTE
SHALL MATURE ON THE 1st DAY OF MAY, 2007 AND THAT ON MATURITY A BALLOON  PAYMENT
EQUAL TO ALL  OUTSTANDING  PRINCIPAL AND ACCRUED AND UNPAID  INTEREST  HEREUNDER
SHALL BE DUE AND PAYABLE.

     All payments of principal  and interest of this Note shall be made by Maker
to Payee in federal or other immediately available funds. Payments made to Payee
by Maker  hereunder  shall be  applied  first to  accrued  interest  and then to
principal.

     Should the principal of, or any installment of the principal of or interest
upon, this Note become due and payable on any day other than a Business Day, the
maturity  thereof  shall be extended to the next  succeeding  Business  Day, and
interest shall be payable with respect to such extension.

     3. Security.  The payment of this Note is secured by the Pledge pursuant to
which the Maker has  pledged  and  granted a  security  interest  in 100% of the
membership  interests of Tradestar  Acquisition  Sub,  L.L.C.,  a Nevada limited
liability company, as collateral for this Note.

     4. Waivers.  Maker and each surety,  endorser,  guarantor,  and other party
ever liable for payment of any sums of money payable upon this Note, jointly and
severally waive presentment,  demand, protest, notice of protest and non-payment

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or other notice of default, notice of acceleration, and intention to accelerate,
or other  notice of any kind,  and agree  that their  liability  under this Note
shall not be affected by any renewal or extension in the time of payment hereof,
or in any indulgences,  and hereby consent to any and all renewals,  extensions,
indulgences,  releases,  or changes,  regardless of the number of such renewals,
extensions, indulgences, releases, or changes.

     No waiver by Payee of any of its rights or remedies  hereunder or under any
other  document  evidencing  or  securing  this  Note  or  otherwise,  shall  be
considered a waiver of any other  subsequent  right or remedy of Payee; no delay
or omission in the  exercise or  enforcement  by Payee of any rights or remedies
shall  ever be  construed  as a waiver of any  right or remedy of Payee;  and no
exercise or  enforcement  of any such  rights or remedies  shall ever be held to
exhaust any right or remedy of Payee.

     5. Representations and Warranties.  Maker hereby represents and warrants to
Payee as follows:

          (a) Maker is a corporation,  duly organized,  validly  existing and in
     good  standing  under the laws of Nevada and has the power and authority to
     own its property and to carry on its business in each jurisdiction in which
     it does business.

          (b) Maker has full power and  authority  to execute and  deliver  this
     Note and Pledge  and to incur and  perform  the  obligations  provided  for
     therein, all of which have been duly authorized by all proper and necessary
     action of the  appropriate  governing body of Maker. No consent or approval
     of any public  authority or other third party is required as a condition to
     the validity of this Note and the Pledge,  and Maker is in compliance  with
     all laws and regulatory requirements to which it is subject.

          (c) There is no event that is, or with  notice or passage of time,  or
     both, would be a Default under this Note and the Pledge.

          (d) This Note and the Pledge constitutes the valid and legally binding
     obligation of Maker, enforceable in accordance with its terms.

          (e) There is no charter, bylaw, stock provision, partnership agreement
     or other  document  pertaining to the  organization,  power or authority of
     Maker and no provision of any existing  agreement,  mortgage,  indenture or
     contract  binding  on Maker or  affecting  Maker's  property,  which  would
     conflict with or in any way prevent the execution, delivery or carrying out
     of the terms of this Note and the Pledge.

          (f) All  representations  and warranties made under this Note shall be
     deemed to be made at and as of the date hereof.

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     6. Default and Remedies.

          (a) A  "Default"  shall  exist  hereunder  if any  one or  more of the
     following events shall occur and be continuing: (i) Maker shall fail to pay
     when  due  any  principal  of,  or  interest  upon,  this  Note;  (ii)  any
     representation  or warranty made by Maker to Payee herein shall prove to be
     untrue or inaccurate in any material respect;  (iii) default shall occur in
     the  performance  of any covenants or agreements of Maker  contained in the
     Pledge; (iv) default shall occur in the performance of any of the covenants
     and agreements of Maker  contained in the  Indemnification  Agreement;  (v)
     default  shall  occur  in  the  performance  of any  of  the  covenants  or
     agreements  of Maker  contained  herein on in the  Merger  Agreement;  (vi)
     default  shall occur in the payment of the Senior Debt,  or the Senior Debt
     shall become due before its stated maturity by acceleration of the maturity
     thereof  or  otherwise  or shall  become  due by its terms and shall not be
     promptly paid or extended;  (vii) this Note shall cease to be legal, valid,
     binding  agreements  enforceable  against any party  executing  the same in
     accordance  with  the  respective  terms  thereof  or  shall  in any way be
     terminated or become or be declared  ineffective or inoperative or shall in
     any way whatsoever cease to give or provide the respective rights,  titles,
     interests,  remedies,  powers or privileges intended to be created thereby;
     (viii)  Maker  shall (A)  apply  for or  consent  to the  appointment  of a
     receiver, trustee, intervenor,  custodian or liquidator of itself or of all
     or a  substantial  part of its  assets,  (B) be  adjudicated  a bankrupt or
     insolvent or file a voluntary  petition for  bankruptcy or admit in writing
     that it is unable to pay its debts as they become  due,  (C) make a general
     assignment  for the  benefit of  creditors,  (D) file a petition  or answer
     seeking  reorganization  or  an  arrangement  with  creditors  or  to  take
     advantage  of any  bankruptcy  or  insolvency  laws,  or (E) file an answer
     admitting  the  material  allegations  of, or  consent  to, or  default  in
     answering, a petition filed against it in any bankruptcy, reorganization or
     insolvency  proceeding,  or  take  corporate  action  for  the  purpose  of
     effecting any of the foregoing;  (ix) an order, judgment or decree shall be
     entered by any court of competent jurisdiction or other competent authority
     approving  a  petition  seeking  reorganization  of Maker or  appointing  a
     receiver,  trustee,  intervenor or liquidator of any such person, or of all
     or substantially  all of its or their assets,  and such order,  judgment or
     decree  shall  continue  unstayed  and in effect for a period of sixty (60)
     days;  or (x) any  final  judgment(s)  for the  payment  of money  shall be
     rendered  against  Maker  and  such  judgment  or  judgments  shall  not be
     satisfied or  discharged  at least ten (10) days prior to the date on which
     any of its assets could be lawfully sold to satisfy such judgments.

          (b) If Maker fails or refuses to pay any part of the  principal  of or
     interest  upon this Note as the same become due, or upon the  occurrence of
     any  Default  hereunder,  the  Pledge  or  under  any  other  agreement  or
     instrument  securing  or  assuring  the payment of this Note or executed in
     connection  herewith,  then in any such event the holder hereof may, at its
     option,  (i) declare the entire  unpaid  balance of  principal  and accrued
     interest of the Note to be immediately due and payable without  presentment
     or notice of any kind which Maker waives pursuant to Section 3 herein, (ii)
     reduce  any claim to  judgment,  and/or  (iii)  pursue and  enforce  any of
     Payee's rights and remedies  under the Pledge or available  pursuant to any
     applicable law or agreement.

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     7. Voluntary Prepayment. Maker reserves the right to prepay the outstanding
principal  balance of this Note,  in whole or in part, at any time and from time
to time, without premium or penalty.  Any such prepayment shall be made together
with  payment  of  interest  accrued on the amount of  principal  being  prepaid
through the date of such prepayment in inverse order of maturity.

     8. Usury Laws.  Regardless of any  provisions  contained in this Note,  the
Payee  shall never be deemed to have  contracted  for or be entitled to receive,
collect,  or apply as interest on the Note,  any amount in excess of the Maximum
Rate,  and, in the event Payee ever receives,  collects,  or applies as interest
any such excess,  such amount which would be excessive interest shall be applied
to the  reduction  of the unpaid  principal  balance of this Note,  and,  if the
principal  balance of this Note is paid in full, then any remaining excess shall
forthwith be paid to Maker.  In determining  whether or not the interest paid or
payable under any specific  contingency  exceeds the highest lawful rate,  Maker
and Payee shall,  to the maximum  extent  permitted  under  applicable  law, (a)
characterize any non-principal  payment (other than payments which are expressly
designated  as interest  payments  hereunder)  as an  expense,  fee, or premium,
rather  than as  interest,  (b)  exclude  voluntary  prepayments  and the effect
thereof,  and (c)  spread the total  amount of  interest  throughout  the entire
contemplated  term of this Note so that the interest rate is uniform  throughout
such term.

     9.  Costs.  If  this  Note  is  placed  in the  hands  of an  attorney  for
collection,  or if it is  collected  through any legal  proceeding  at law or in
equity, or in bankruptcy,  receivership or other court proceedings, Maker agrees
to pay all costs of collection,  including,  but not limited to, court costs and
reasonable attorneys' fees, including all costs of appeal.

     10. Notices. Any notice that may be given by either Maker or Payee shall be
in writing  and shall be deemed  given  upon the  earlier of the time of receipt
thereof  by the  person  entitled  to  receive  such  notice,  or if  mailed  by
registered or certified  mail or with a recognized  overnight  mail courier upon
two (2) days after  deposit  with the United  States  Post Office or one (1) day
after  deposit  with such  overnight  mail  courier,  if postage is prepaid  and
mailing is  addressed  to Maker or Payee,  as the case may be, at the  following
addresses, or to a different address previously given in a written notice to the
other party:


         To Maker:   Tradestar Services, Inc.
                     3451 Candelaria NE
                     Albuquerque, New Mexico 87107
                     Attention: Frederick A. Huttner, Chief Financial Officer
                     Facsimile: (213) 593-8727

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         with a copy (which shall not constitute notice) to:

                     Haynes and Boone, LLP
                     One Houston Center
                     1221 McKinney Street, Suite 2100
                     Houston, Texas 77010
                     Attention:  Bryce D. Linsenmayer, Esq.
                     Facsimile:       (713) 236-5540

         To Payee:   Larry M. Wright
                     911 Creek Wood Way
                     Houston, Texas 77024
                     Facsimile:       (713) 464-8048

         With a copy (which shall not constitute notice) to:

                     Hirsch & Westheimer, P.C.
                     700 Louisiana Street, 25th Floor
                     Houston, Texas 77002-2728
                     Attention: Bradley E. Rauch, Esq. and Michael S. Wilk, Esq.
                     Facsimile: (713) 223-9319

     11. Subordination.

          (a) Maker agrees,  and Payee,  for itself and for its  successors,  by
     accepting  this Note agrees that the  obligation  represented  by this Note
     shall be subordinated in right of payment,  to the extent and in the manner
     provided  in this  Section  11, to the prior  payment in full of all Senior
     Debt.

          (b) Except as provided in Section 11(c) below, from and after the date
     hereof until  maturity  (or  acceleration  of  maturity) of this Note,  and
     unless  Wells  Fargo  expressly  consents  in writing to the  contrary,  no
     payment on this Note shall be made or given by or on behalf of Maker or any
     affiliate thereof and no payment on account of this Note shall be received,
     accepted, or retained by Payee, nor shall Payee accelerate, make any demand
     for,  or  attempt  to  receive,  collect,  or retain  the same,  whether by
     collection, set-off, foreclosure, counterclaim, or otherwise.

          (c) Notwithstanding anything contained herein to the contrary, so long
     as Payee has not received notice from the holders of the Senior Debt that a
     Senior  Debt Event of Default  has  occurred  and has not been cured in the
     prescribed  period of time, Maker may pay, and Payee may receive,  payments

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     of principal and interest and other  amounts due under this Note;  provided
     that,  following an the occurrence of a Senior Debt Event of Default,  such
     payments  may and shall be resumed  upon the date on which such Senior Debt
     Event of Default is cured or waived.

          (d) Payee agrees to execute any and all documents reasonably necessary
     or  reasonably  required by any Senior Debt lender in order to evidence the
     terms,  agreements  and  conditions  with respect to the  subordination  of
     payments on this Note.

         12. GOVERNING LAW. THIS INSTRUMENT AND ALL ISSUES AND CLAIMS ARISING IN
     CONNECTION WITH OR RELATING TO THE  INDEBTEDNESS  EVIDENCED HEREBY SHALL BE
GOVERNED AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS AND THE
APPLICABLE LAWS OF THE UNITED STATES OF AMERICA.

     13. ENTIRETY. THE PROVISIONS OF THIS NOTE MAY BE AMENDED OR REVISED ONLY BY
AN  INSTRUMENT  IN WRITING  SIGNED BY MAKER AND PAYEE.  THIS NOTE  EMBODIES  THE
FINAL,  ENTIRE  AGREEMENT  OF MAKER AND PAYEE AND  SUPERSEDES  ANY AND ALL PRIOR
COMMITMENTS, AGREEMENTS, REPRESENTATIONS, AND UNDERSTANDINGS, WHETHER WRITTEN OR
ORAL,  RELATING  TO THE SUBJECT  MATTER  HEREOF AND MAY NOT BE  CONTRADICTED  OR
VARIED BY EVIDENCE OF PRIOR,  CONTEMPORANEOUS,  OR SUBSEQUENT ORAL AGREEMENTS OR
DISCUSSIONS OF MAKER AND PAYEE.  THERE ARE NO ORAL AGREEMENTS  BETWEEN MAKER AND
PAYEE.

     14.  WAIVER OF JURY  TRIAL.  MAKER,  TO THE  FULLEST  EXTENT  PERMITTED  BY
APPLICABLE LAW, HEREBY KNOWINGLY,  INTENTIONALLY,  IRREVOCABLY,  UNCONDITIONALLY
AND  VOLUNTARILY,  WITH  AND UPON  THE  ADVICE  OF  COMPETENT  COUNSEL,  WAIVES,
RELINQUISHES  AND FOREVER FOREGOES THE RIGHT TO A TRIAL BY JURY IN ANY ACTION OR
PROCEEDING  BASED UPON,  ARISING OUT OF, OR IN ANY WAY  RELATING TO THIS NOTE OR
PLEDGE.

                            [Signature page follows]


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                                    MAKER:

                                    TRADESTAR SERVICES, INC.




                                    By: /s/ Clarence J. Downs
                                        ---------------------------------------
                                           Clarence J. Downs
                                           Chairman and Chief Executive Officer

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