I'd do a stock bore stock stroke motor build with a 6-8inch arm and put struts and a bar on it and boom your done. Then take the bar off and put the shocks back on for duning.
A Raptor 700, lowering kit, stock arms,*brand new* outsu 501(stock 2001 400ex rear)tires, msd programmer, 15t front sprocket, 12.5:1 CP piston, stg 3 hot cam, my mild port head, duals and a K&N filter kit. That setup runs low 5's in dirt 300' consistently on more than 6 different bike's. That's more than plenty to beat you average weekend warriors and it will be just as reliable.
As far as the classes are the classes are setup what normally is the difference between a 4stroke modified and an open class rig. Is there normally some big change that moves you up like stretched frame or something.
Best thing to do is look up the class rules for the organization your going to race with and then build your bike to fit those rules. Rather than build a bike and then try to figure out where it fits. Generally an open class is run what ya brung, no restrictions on Engine size or modifications to engine or chassis. Modified will usually have some sort of engine and or chassis restriction.
Yeah, I am waiting for them to get them posted. I have been back and forth with my buddy who owns the local shop all day on what platform to build. He is really trying to push me into a banshee.
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