Dio AF27 - Bigbore size vs crank

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epitaph

Well-Known Member

• 4 November 2010

• #1

Hi,

I have just started building my 1st modded Dio engine AF27 (AF18E)
Question: How big can you go with the big bore kit while still using the stock crank?

From research I have done, it seems you can go up to 49mm big bore kit and still use the stock crank, is this correct?

Thanks

 

tiba_karotsu

OVERREV TUNING

• 5 November 2010

• #2

there used to be lots of kits sold here for the Dio ranging from 44mm to 54mm & they still used the stock stroke crank, for the 54mm to fit you'll need the crankcase bored.

the norm here is 50mm which gave you 82cc, using a 44mm crank (biggest you can fit inside stock case) will net you 86cc.

 

E

epitaph

Well-Known Member

• 5 November 2010

• #3

Thanks for your response tiba,

Im trying to avoid having to machine cases for a crank, your 50mm 82cc setup sounds perfect.
Also I was thinking CT manifold with 28mm OKO carb, and exhaust to suit... is this the best carb size to suit 80cc setup??

 

tiba_karotsu

OVERREV TUNING

• 7 November 2010

• #4

the CT manifold can only accommodate a 26mm carb, look for a PE26 keihin.

the 44mm crank i'm talking about is a bolt on fit.