A port’s time-area is a calculation of a port opening’s area and timing in relation to the displacement of the engine and the rpm. The cylinder ports are designed to produce a certain power characteristic over a fairly narrow rpm band.įirst measure and calculate the stock engine’s specifications – the most critical measurement is the port’s time-area. If you have necessary tools then you can try to modify the stock cylinder. If this not the case and you have maybe restrictions to do so then there are things that can be done on a stock cylinder. The easiest option to say is to go for a larger, big bore cylinder. I would suggest to keep the stock timing as the engine is revving lower then there is no need to advance or retard it. Moto Tassinari options can be found on ebay: here) Ignition Although some suggest that simple glass fibre reeds and reduced reed size is a good option for low revving engine then carbon fibre option woks as good (e.g. What this does is that smaller diameter increases air-mass velocity and improves flow characteristic.Įxperience has shown that changing the reed valves does not have effect on the torque. For 100cc engine 24-26mm is sufficient, 125cc engine 30-34mm. If you have a 50cc engine then try out 17mm or 19mm carb. Try reducing the size of the carburettor. By increasing the primary compression you effectively work on increasing the mixture movement velocity, which supports the high rpm engine. It is the same with filling the webs or using the other ways of increasing the primary compression. High primary compression crankshaft (HPC) is not suggested as the volumetric efficiency of the crankcase for the primary compression increases. An option is to go for an aftermarket crankshaft with the longer stroke reweld the conrod’s big end hole. Increasing the stroke is probably the most effective way to increase torques as it increases the displacement of the cylinder and in effect decreases the peak rpm. Below are some easier modifications that you can easily do and others require more skill, special software and tools. If you are willing to try out some changes yourself, then below are some tips how to turn the high revving engine into torque monster. Or, if you are just looking more to enjoy cross country and trail riding then you do not need high revving engine. If you are in the ATV motocross (all those Apex PRO MXR and DRR 50cc, 70cc and 90cc engines) then you definitely have room for improvement for those small size engines that have to carry substantial weight on them. So you have your engine which is top notch, but you feel that the power curve is very narrow and the feel of the bike is very abrupt.
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