CN250 performance tweeks for Roketa GK-13
I have a Roketa GK-13 with a CN250. The engine runs great but the gasket on the crankcase directly under the cylinder is leaking bad. I have the engine out and am waiting on gaskets and seals to show up. Everything is stock currently but I have ordered Dr Pulley 19g sliders and a yellow torque spring for the clutch, along with a Uni filter and main and pilot jets.
Anyway, I was wondering if there are any easy performance tricks I can do while it is apart? Porting the head, is it worthwhile on these? Milling the head to raise compression (I have a machine shop at home), or is that a no-no with the chain driven over head cam? Not looking for performance cam at this point do to cost. I also have a 400cc yamabuggy for going fast, but would like the Roketa to be a little more fun. Mainly flat land, open trails.
Thanks,
Patrick
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