As stated in past posts I have the 6mm long rod stroke. My power band will cease at about 9200 rpm. For dirt drags that is fine but if on a long stretch you will only be putting the max stress on the engine. I have more than enough power at the bottom rpm range so I will be re-gearing my final drive which will move the power band to a lower rpm range since now most of my driving is on trails and hills. Now my buggy is the early GY6 with external reverse so I have the option of re-gearing the final drive which the internal reverse models don't. I run the stock sprockets on mine so he may have to go with a smaller axle sprocket. That will be determined once he gets it all together using an accurate tachometer.
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