Anyone ever moved the ringpin in their pistons? Im running kawasaki flattops in a big bore and Im about ready to put it together. I heard the ringpin in the piston doesnt align properly on the yamaha sleeves. I was just wondering the proper procedure? I was going to heat the piston up and see if the original pin would pull out. If not drill it out. Then drill the proper sized hole for a new ringpin heat the piston and put it in. Any better ways to do it?
moving ring pin in piston
- Thread starter RideItLikeYouStoleIt
- Start date
No one knows then huh?
Motorheads5
Livin the generation gap
- Location
- ketchikan alaska
I don't think this is a custom procedure that will work very well ?
I am pretty sure that any of the engine builders on here do it. I was told I can send them to someone like LPW and they can do it for me. I would rather do it myself. I was wondering what was the common practice for doing this to save myself sometime and do it right the first time. If you dont move the pins the chances of catching a ring on a port are pretty high.
It is not uncommon when running a flat top set up to have to move the ring pin. your right a little heat and the pis should come out. Just make sure when you are drilling the new hole to make it small enough to that you have to tap in the pin into the new hole. I have seen a few motors when the pin hole was too large and the pin fell out!!!!! It can get pretty expensive pretty quick when that happens.
Motorheads5
Livin the generation gap
- Location
- ketchikan alaska
I am not familiar with what it is you are trying to do I guess?
can't you get flat top's from someone for your application?
can't you get flat top's from someone for your application?
Motorheads5
Livin the generation gap
- Location
- ketchikan alaska
The problem he is running into is that the ring pin lines up with one of the transfer ports when using these in a yamaha cylinder. So you just have to move to locating pin a bit to avoid catching a ring. We used to do this when I did snowmobile motors as well. It was cheaper and easier to modify existing pistons then to have custom ones made. With the right tools and a little knowledge, its a pretty easy mod.
Motorheads5
Livin the generation gap
- Location
- ketchikan alaska
gotchya good knowledge thank you how's the little one I will send a pm:Banane37:
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#ZERO
Beach Bum
- Location
- Florida - U.S.A.
Why not just sell the Kawi pistons and go with the Riva flat tops?
It's more expensive to have the piston ring guide pins relocated and machined.
It's more expensive to have the piston ring guide pins relocated and machined.
- Location
- So. IL
If your at low throttle you might get by with just a bore and pistons. BUT at WOT it can cost a case and a crank rebuild also. More money that the first build.
- Location
- Near Seattle WA
Bump
I have a set of New Riva 85mm flat tops I would sell.. $275.00 OBO.
I would be extremely cautious relocating your own pins.. You might be able to do it, but the "crush" must be correct or they will fall out from heat & detonation.
wcc@watcon.com
I have a set of New Riva 85mm flat tops I would sell.. $275.00 OBO.
I would be extremely cautious relocating your own pins.. You might be able to do it, but the "crush" must be correct or they will fall out from heat & detonation.
wcc@watcon.com
#ZERO
Beach Bum
- Location
- Florida - U.S.A.
That's a good deal; they're usually 200 bucks a piece.
It wont cost me a cent. I have access to every tool and cnc machine you can imagine. Id machine my own pistons before i spent that. Thanks anyways. I already pretty much knew how to do it. Just wanted to make sure it was the easiest way.
Ill heat it to about 350 celsius then pull the pin. Let it cool. Drill a slightly smaller hole than the pin. Heat it back up. Put pin in. Let it cool. Pretty simple. Wanted to make sure that was easiest way.
Ill heat it to about 350 celsius then pull the pin. Let it cool. Drill a slightly smaller hole than the pin. Heat it back up. Put pin in. Let it cool. Pretty simple. Wanted to make sure that was easiest way.