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Discussion Starter #1
I've a honda cb350 that I've disassembled and found one of the pistons has blown a hole through the top of it. So I purchased some pistons that are .020 over but need to know how much clearance there is supposed to be between the cylinder wall and the piston? I'm in Iowa and had a hard time finding anyone able to do an engine as small as this.

any help or ideas on where to find help would be great
 

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Discussion Starter #3
I've been told to go 2 to 2 1/2 thousandths for the clearance needed.

I'm going to keep checking around until I get a definite answer though. My local honda dealer/service dosen't have an answer for me either. someone has to know.
 

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About .002" is typical of Honda street bikes. Measured at the skirt, perpendicular to the wrist pin.

For top notch work try these guys:
http://www.langcourt.com/index.htm

Ship them the cylinder and the pistons and in about two weeks you get them back in beautiful condition, bead blasted, serial numbered and bored to perfection. Should be about $100 for a twin. I've had them do all my race engines and I've never had a problem. A service manual should give you the details on proper piston to wall clearance.
JohnnyB
 

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yeah, definately email bill at boretech! he is a great machinist and loves the cb350. a racer who also sponsors weravintage.

his email is off the link. don't forget to ship the nos pistons with the bore.

tex
 

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Try Baxter Cycles in Marne Iowa. They're out in the western part of Iowa and sepcialize in British stuff and MotoGuzzi but they have experiance with small engines and may know of someone who knows something about Hondas.

Mike O.
 

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mike, do you have a phone number for those guys?

tex
 

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Discussion Starter #8
So far everyone I've talked to has said .002 clearance. My dad used to work on these bikes during the 70's in Austrialia and .002 was what he said but told me to check up on it because it has been thirty years since he last did something like this.

Thanks also for recomending some people that do quality work.


Ben
 
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