pinning a piston?
 

I have a 25cc piston that I want to pin the ring so I can take the blockage out of the exhaust port. Can a stock ring be pinned? Anyone have close up pics of the process?

RE: pinning a piston?
 

This is a good mod, and worth doing. You need to get a new ring from Frank Bowman that is made for use with a pin however. It could be done with a stock, or original ring but the ring gap would be wide and you would lose power.

AV8TOR

RE: pinning a piston?
 

Better yet send your piston to Frank.

Have him pin it and install one of his famous rings.

You will be one Happy Camper.:D

RE: pinning a piston?
 

Does Frank Bowman cut piston groves in a blank piston for his rings? Thanks Capt,n[:-]

RE: pinning a piston?
 

There is one way to find out for sure.

[email protected]

505-327-0696

RE: pinning a piston?
 

Ralphbf: Thanks for the Number. I did call, and found out everthing I needed to know. Also got to talk to a Trout fisherman like myself!!! What a great day....Best Regards Capt,n:D:D

RE: pinning a piston?
 

Well Captin, Does Frank Bowman cut piston groves in a blank piston for his rings?

Also does he cut ring grooves in old pistons for a second ring?

RE: pinning a piston?
 

Yes Frank can do all that...but it sounds real easy to do it for myself. He is quite busy making piston rings now. I do not think adding a 2nd ring is going to help that much. Two rings will create more drag and cost twice as much I suspect. The aplication on certain engines, may make 2 rings worth it. Capt,n

RE: pinning a piston?
 

I had another guy interested in the Frank Bowman piston ring. I see the email address...does he have a web-site also? Thanks Capt,n;) ADDED..Franks Phone number is 505-327-0696

RE: pinning a piston?
 

can anyone tell me if it is realy worth takeing the bar out of the exhaust port. If so what can I expect in power increase?

RE: pinning a piston?
 

I can't give you a perfect, "before, then after with no other changes" comparison, but it very definitely increases the power noticeably and is a very good modification to do. I do it to any Homelite 25cc I convert, whether it is for me or someone else....

AV8TOR