4 mill with out cool head or spacer plate

[thomas h.]

Do builders cut 2 mm out of a stock head to clear the 4mm crank?

 

I picked up a shee last week and it was advertised a 400cc by alba but it didn't have the plate. It had no port and 310 jets and the pistons are coated in carbon because the jetting was rich. I can't read the top of pistons with video scope. Any other way to check besides tearing it down?

 

I put 290 mains and its good now

[Coupelx]

Yes it can be done. you can measure the stroke using something like a pencil doen the spark plug hole. make a mark at top dead center and bottom dead center. stock is 54mm so 58 is a 4mil crank.

[thomas h.]

 

Also measured with a pencil.

Not a 4mill

[trickedcarbine]

To answer an earlier question, yes a stock head can be set up to accept stroke.

[thomas h.]

I like the sleeper 4 mill idea.

Also less leaks and better than spacer