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Hmm, well gearing may have something to do with it, but it probably also depends on the porting done to each of your cylinders. I was told mine was the "low-mid" porting. Maybe your buddy's is ported for better low-end performance? I might have to email Eric Gore and see if anything else can be done to my bike to...

I've been wondering if anybody does a stroker kit for the RM125. So you got your stroker cranks from Eric Gore as well? I'd love to know how that compares to just the 144 like mine. I really like my bike, a touch more torque certainly wouldn't hurt it though. Here's my RM144.

I've got an EG 144 mod on my 'o3 RM125 and love it. What is the 155? Is it just a bigger bore or a stroker crank as well?