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Chris Rayer
Un nom - une histoire – une passion

 

Questions / Réponses

1 – iF I increase my 125cc engine’s power output, what extra speed will I obtain?

Answer: There are many ways of increasing an engine’s power output, depending on the results you want. The power output does not mean anything unless it relates to an engine speed in rpm.
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This means, for example, that an extra 5 hp from an engine produces very different results, depending on whether it is obtained at 6,000 rpm or at 9,000 rpm from the same engine:
  • In the first case, the engine will provide the power more easily at low and mid-range revs. This produces considerably better acceleration, even uphill (especially uphill!) and reaches top speed more quickly than before with the same load, but it does not increase the top speed because the engine will be less efficient at high revs (as maximum torque will be produced at lower revs).
  • In the second case, the engine will be less responsive at low revs and will require revving to produce all its power. Obviously, you must change gear more to keep up the revs, which is inconvenient = riding is less pleasant and ultimately weakens the engine, gearbox and transmission (“sporting” riding). If the power is produced at higher revs, on the other hand, the highest possible gear ratio acceptable by the engine can be used and a 10-20% absolute top speed increase can reasonably be expected in many cases if maximum revs is also increased slightly, with a flat power curve, if the rider balances the gear ratio with the engine load properly. If there is a hill, or even an incline or a strong headwind, however, the absolute top speed will drop. You must be aware of this fact and choose accordingly, depending on what results you want to achieve.
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2- If I modify my engine, can I ride on the road nevertheless?

Answer: Absolutely not; this is forbidden. You must ride only on private circuits closed to public traffic, or on private property.

To ride on the public highway, you must make a homologation request yourself and then present the vehicle to the department’s homologation authority (“service des mines”), or else be a motorcycle club member, be licensed, and ride on the private land generally available to club members.


3- Can I dismantle and modify my engine myself?

Answer: Everything is possible, but some technical knowledge and equipment is needed to dismantle and reassemble a four-stroke engine, in order to adjust the timing.
It is simpler to dismantle and reassemble a two-stroke engine, but tuning the carburation is more tricky and extremely important.
Technical reviews and workshop manuals are commercially available.
If you have doubts, we recommend asking a professional to perform the work.

 

4 - If I modify my engine, is there a warranty?

Answer: No, that is impossible. Manufacturers’ warranties are issued and applied by their service networks, and are subject to very strict limitations.
In the case of replacement parts that are fitted unaccompanied and used without checks and with no detailed governing framework, it is impossible. People who say otherwise are either liars or philanthropists.

5 - Will my engine be able to withstand a large torque increase at low revs without breaking?

Answer: All Japanese, Chinese and Korean 125cc engines are sized to withstand a large increase in torque without problem. In forty years, we have never had a single engine that has had problems at low revs, even after the torque has been greatly increased.

As an experiment, we have a Yamaha four-stroke 125cc TTR engine that has been running perfectly and without problem for a very long time, with a cylinder capacity of 246cc (in other words, double the original cylinder capacity), the original crankcase and all the maximum options (HP camshaft + 26 carburettor + exhaust + 11,000 rpm electronic unit, etc.) producing an additional 20 hp. It runs like a sewing machine, and never has a problem.

 

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