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90cc case used for 70cc?
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Posted by: WISH1965

G,

Can the 90cc case I have be used for a 70cc if we were to purchase a different crank and a 70cc cylinder/head. It is my understanding (correct me if I'm wrong) that the stroke of the DRR 50 & 70cc are the same. Can a 70cc crank and cylinder/head be used in a 90cc case to get the desired 70cc with little or no modifications?? If so this may help. Please advise. Thanks.

WW

Posted by: jetmedic

50 and 70 share same crank and cases. 90 cases have a larger crankcase volume for the longer stroke crank. 50 and 70 have 39.2 stroke crank

Posted by: jetmedic

a 70crank and cyl will run with 90cases but thats all it will do is run. you will not get a race motor out of it.

Posted by: WISH1965

JM,

Thanks for heads up.

WW

Posted by: Bolinracing

I have a question. Do the 50 70 90's all bolt up the same. Basically I guess my question is, can they all bolt up to the same frame? Thanks.

Posted by: jetmedic

absolutely.