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TM Racing User Advice

Find any guidance or advice notes or advice released by 777MX or TM Racing here.

2013 TM Racing 85cc Machine

Important Information On The 2013 TM Racing 85cc MX Machines.

Please Note:


 It is advised that for the UK climate and condition all 2013 85cc machines be fitted with a 230 size main jet, this will ensure adequate fuelling at all and allow for conditions and temperature variancies in our climate, the performance of the machine will not be affected, it will in fact be improved and increase longevity of the internal components of your TM Racing machines race engine. Please ensure regular plug colour checks are performed to ensure correct running in altering ground conditions / sand surfaces and temperatures.

Please note that superunleaded fuel must be used at all times, this fuel should be mixed with a high quality two stroke racing synthetic premix lubricant to a ratio of 33:1.


When replacing pistons and/or piston rings please ensure that the correct ring end gap of 0.30mm > 0.35mm is achieved, if the ring gap is smaller than these specified measurement the ring end gap must be enlarged. The piston ring end gap can easily be increased using a small carbon stone to abrase the ring and achieve the correct gap, please ensure after using any tool to remove material from the piston ring that all burrs and rough edges/corners are removed and the ends of the rings are clean and burr free before fitting the piston ring into the piston, please check for free movement of the piston ring within the piston ring gap on the piston. As this 85cc engine has been designed to give the required high performance that has come to be expected from TM Racing's high rpm two stroke machines it is advised that the piston be changed at regular intervals with piston ring changes in between. It is advised that under 'normal' operating conditions that the piston ring should be changed at approximately 6 hours, the piston should be changed at 10-12 hour intervals, please note that under harder use conditions, ie sand or extreme temperature variations this time be reduced.

Failure to ensure the correct piston ring end gap is achieved during assembly and that piston ring and complete piston change intervals are adhered to will lead to premature failure and engine damage.


When fitting new pistons it must be noted that the correct squish values must be obtained to ensure correct running of the engine and to ensure premature engine failure does not occur due to over compression and overheating scenarios. The correct measurent for the 2013 85cc engine is 0.60mm > 0.65mm, this figure can be achieved by using altering thickness base gaskets that are readily available from TM Racing dealers.

Failure to adhere to the correct squish measurements could lead to engine failure and damage.


Please use genuine TM Racing spare parts in your TM Racing machines, using inferior parts could lead to premature engine failure and or damage to persons, the use of non genuine spare parts will also invalidate any warranty on your TM Racing machine.





Maintaining Your Electronic Exhaust-valve System.

It is advised that the following procedure relating to the set-up and maintenance of your TMEES Engine is used as per instruction on a regular basis to ensure both the performance and reliability of your TM Racing machine is maximised, it should be noted that TM UK recommend the procedure be applied to your machine at 4 hours intervals for MX and prior to each event for Enduro machines.

Please Click On The Link Below To Download The TMEES Set-Up Guide.

TMEES Set-Up Instructions with images.

The above instruction manual has been translated by the TM Racing Staff into English, therefore some of the wording will seem unfamiliar, please see below for an altered translation of the numbered procedures.

NOTE: The servo unit only needs to be removed from the machine to replace the cables, for simple maintenance and cable adjustment the servo unit can stay attached to the cylinder brace but with it's two fastenings bolts loosened slightly to allow some movement whilst performing the cable adjustment operation. The domed Allen Key headed bolt in the black moulded plastic cover on the servo unit can be removed to give access to the 4mm positioning hole for locking the servo arm 'pulley reference' hole into place prior to cable adjustment. If the 4mm 'pulley reference' hole in the servo arm  is not inline with the 4mm hole in the servo unit's black moulded plastic cover the servo can be moved by gently rotating the cable arm on the cylinder, this will allow the cables to pull on the servo arm rotating the 4mm 'pulley reference' hole into the correct position for a 4mm locking pin to be inserted. It is advised that the 4mm 'tool' used to lock the servo arms 'pulley reference' hole to the covers 4mm positioning hole be slightly tapered to ease insertion.

1: Cables fitted in the correct position.

2: Cable with red sheath fitted into the lower position.

3: Cable tensioner locking nuts wound back fully allowing the tensioner adjuster to be screwed fully into the servo unit allowing maximum cable movement (fully 'slack').

A: 4mm hole in the servo arm used to lock the servo into place for correct cable adjustment.

4: Black moulded protection cover in place and secured using the 6 screws.

5: Servo Unit installed onto the cylinder brace with the cable tensioner adjuster locking nuts wound back fully with the tensioner adjuster wound fully into the servo unit allowing maximum cable movement (fully 'slack').

6: Pulley reference 4mm positioning hole in the black moulded plastic cover inline with 4mm 'pulley reference' hole in the servo arm, please see 'NOTE' above for instructions on aligning the two holes with the servo unit fitted in place on the cylinder brace.

7: 4mm 'tool' inserted into black moulded plastic cover positioning hole and into 4mm 'pulley reference' hole in servo arm, this locks the servo into the correct position for cable adjustments to be set.

8: fixing the two cables to the cylinders exhaust valve pulley arm.

9: Remove the cylinder's black moulded plastic cover to expose the cylinder exhaust valve pulley arm and cable housings. Lock the cylinder exhaust valve pulley into place using another 4mm 'tool' allowing it to pass through the exhaust valve pulley arm and into the 4mm positioning hole located in the cylinder, this secures the cylinder exhaust valve pulley into the correct position prior to cable adjustment (cylinder exhaust valve pulley 4mm locking hole shown in 'Figure 4')

NOTE: both the cylinder exhaust valve pulley arm and the servo units pulley arm must both be locked into position to adjust the cables correctly.

10: Adjusting the tension of the pulley cables by means of winding the tensioner adjusters screwed into the servo unit outwards (anti clockwise) removing the 'slack' from the cables.

NOTE: The correct tension of the two pulley cables is set thus, remove the upper cable from it's machined recessed housing in the cylinder and hold it over its housing, whilst pushing the black sheath of the cable gently rearward to ensure the cable is pushed fully home into the cable tensioner adjusters on the servo unit simultaneously wind the tensioner adjuster outwards increasing the tension until the cable sheath's silver cap at the cylinder end is between 1.0 to 1.5mm over the fitting face, this ensures the correct cable preloading is set. The cable sheath can then be pulled gently backwards and pushed into the machined recessed housing that secures it. Repeat this procedure with the lower cable. Please try to ensure the cables are running from the servo to the cylinder in as straight a line as can be achieved, this can be assisted by moving the servo on it's elongated mounting holes.

11: Once the correct tension has been set on the pulley cables the locking nuts on the cable tensioner adjusters of both the upper and lower cables can be wound clockwise against the servo unit body and tightened locking the cable tensioner adjusters into place, please ensure the the cable tensioner adjusters are held securely in position whilst tightening the locking nuts to avoid accidental cable adjustments.

12: Remove the two 4mm 'tools' used to lock both the servo pulley arm and the cylinder exhaust valve pulley arm into place during cable tensioning.

13: Refit the domed Allen Key headed bolt into the pulley reference positioning hole in the servo's black moulded plastic cover.

14: Refit the cylinder pulley black moulded plastic cover and replace the 3 fastenings allen bolt securing it into place.

15: Retighten the servo units two fastenings.

16: Reinstall the 4 rubber protection 'boots' on the two pulley cables into their correct positions to minimise water and dirt ingress into the cables and operating system.

Please ensure the powervalve cables are treated as per any other cable, ensure frequent lubrication of the cables by either a penetrating spray or a designated light cable oil. Also periodic changing of the cables is advised, as with any cable under load, and whilst in a harsh environment, it will eventually fail, if the cable shows any sign of corrosion or fraying of the cable wire strands please replace the cable immediately. TM Racing part No' 64038.


125cc TMEES Engine Carburetion Advice.

Correct fuelling of any engine is of uppermost importance to ensure correct performance and reliability, please ensure that conditions, temperature, elevation and rider ability is taken into consideration when carbureting your machine. Remember that an engine running on a harder surfaced circuit on a warm day will require different fuelling to the same engine on a loose surface circuit on a colder day.

IMPORTANT INFORMATION: The new TM Racing TMEES engine is a high performance competition motor and it is recommended that the larger carburettor main jet sizes are fitted immediately during running-in and for initial 'hard runs' to give yourself a base setting.  As there are so many variables with carburetion settings it is advisable that the possibility of being too 'rich' on fuelling is better than being too 'lean'. This latest generation of TM Racing 125cc engine with the electronic exhaust-valve operation is 'all new' and needs to be treated as such, therefore all known carburetion settings that were employed in the previous engine design are to be discarded, it is advised that a new program of education in fuelling this new engine is devised as it's required fuel quantities at various rpm stages have altered, this shows in the differing needle designation and position and jet sizes. Please be advised to start with larger main jet sizes and decrease as required, not the other way round.

Please be advised that is up to you to ensure that you machines engine is running correctly, checking the spark plug during every ride will soon inform you of any changes that may need to be made to your machines carburetion for the conditions. It is advised that you carry a selection of carburettor jets suitable for you machine which will allow you to make any changes should the need arise. NOTE: Incorrect carburetion will lead to poor performance, bad running and even engine failure.



TM Racing 125cc TMEES Engine Standard Settings And Advisories.

PLEASE NOTE: All advisories are for assistance only, you must test and set your machine to the given conditions, Super-unleaded fuel must be used at all times pre-mixed to the correct oil ratio of 33:1 - 40:1 (600ml / 500 ml of quality synthetic oil to 20 Litres of fuel), please be advised that conventional 'regular' unleaded does not meet the higher octane requirements of competition engines and it's use will lead to poor running and even engine failure.

Spark Plug - NGK BR9 EG


Pilot Jet size - 50/52

Advisory: 45 / 48 pilot jets will help low end response if you are using a tick over on the machine.


Main Jet size  - 185

Advisory: 195 / 200 / 210 size main jet. We have found during initial UK testing that the engine seems to give better performance on larger main jet sizes as it's efficiency of burning fuel is very good, more fuel and oil also gives more engine safety especially in softer/sandy conditions and/or lower temperatures.

NOTE - conditions, temperature, elevation and rider ability.


Mixture Screw - 1.5 turns outward (anti-clockwise)  from fully closed inwards (clockwise)

Advisory: Mixture can be tested and set as per conditions, 1 turn outward to 1.75 turns outwards can be utilised.


Needle Position - Position 3 ( Middle setting)

Advisory: Stock setting adequate for most conditions unless extremely heavy and/or cold where it may be advised to move to position richen the machine working with changes to main jet size to suit and needle position, alternatively extreme hot temperature and/or higher elevation changes could require going to a leaner setting working with changes to main jet sizing and needle position. Also we have available another needle, designated N1EI, that has proven to work in nearly all conditions with the settings of 50 pilot, 195 main, needle clip position 3, mixture set accordingly, BR10EG plug with 1mm washer fitted to lift plug position slightly in combustion chamber.


NOTE: Please ensure correct fuelling at all times, regularly check the engines spark plug colour to ensure your engine is running within the correct parameters, please also take notice of the spark plug advisory relating too temperature. If the machine appears to be running incorrectly please rectify the carburetion or if you cannot do this please stop using the machine immediately and seek advice from your 777MX 01509 210914 or contact us via the *Contact Us* form.