![]() 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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