Bad news for my new red arrow 34cc engine

[szaki75]

i matched the transfer opening to the case too. also removed some corners / edges in the case and compensated the volume with some JB weld.. and formed a ramp to the transfers.
did gentle turbo cut on the crank too.
as i can remember, 65% of bore diameter is the limit to intake and exhaust ports. with some special ring material it can go up to 70% w/o port bridge

 

[Seandonato73]

Yep 70% was the number. There was also a exhaust to intake ratio as well. I didnt know anything about special rings. I prefer Caber if I can get them for the application.

 

[Rep732]

@crucialRC ddm offers modifed for +2mm crank stock ports and modified for +2mm stroker crank+ race ported

 

[crucialRC]

@crucialRC ddm offers modifed for +2mm crank stock ports and modified for +2mm stroker crank+ race ported

Yeah I saw that but won't be getting it until the top end I have takes a ???