Piston Rings

I want to know how much more power an engine with rings has vs. one with no rings. My engine runs on the stand, but when I take the ped off the stand the engine stalls. I took the engine apart and found that it only has .5 of a rings when it should have two. I think that the motor is just not getting enough power to keep it from stalling??? Any help would be great. And could you tell me where I could get new rings?

Re: Piston Rings

Please explain how the piston can have 1/2 of a ring? If it has less rings than it has ring grooves, then someone without a clue has been in there. Put the proper rings on the piston and it will have the power.

Re: Piston Rings

Hi! If you're talking piston rings you have to have how many the bike manual says(probably 2 or 3) .Are you talking piston rings? You're not talking about a gasket or something else are you? An engine without a full piston ring would start hard and run terrrrrrrrrrrrrrriiiiiiiible.If your piston rings are gone, you'd better look really close at the piston too. Sounds like somebody took it apart and THREW it back together. Getting new rings would depend on what type bike you have: JAP or EURO or ASIAN. BYE! HANDY BIKES has your rings if it's not a JAP.Call (614-299-0550) and ask for B.J.. BYE!

Re: Piston Rings

Chris Robertson /

Your engine actually runs with only half a piston ring?!

First hint: <b>Don't</b> run the engine with only a piece of a ring. There's a good chance you'll score your cylinder, or bits of the ring might break off and get wedged between the piston and cylinder or (worse) get into the crankcase and do the equivalent damage to your engine as a wrecking ball hitting a bungalow.

In answer to your question about power in an engine with rings vs. without. You'll have oodles more power <i>with</i> rings. If you test your compression now (with half a ring) I'd bet you are getting somewhere around 50lbs per square inch. A properly running engine should be at 100lbs minimum.

You've got no choice. You have to have at least one ring (preferably two) on your piston.

Chris.

Re: Piston Rings

Yes the engine runs crapy without all the rings. When I looked at the piston there was two slots for rings in it and on slot had half of a ring on it. Thanks for all the help. And I had to replace the gasket aswell, I used some coper sheet metel for that...

Re: Piston Rings

Well I believe if you're using a cast iron cylinder with a cast iron piston, you dont need rings. But Im not really sure what kindof engines use this but they redline at about 2500rpm though..

Re: Piston Rings

i don't know of any mopeds that don't need rings. you NEED rings on that piston. both of them. if you only have half a ring, do look very closely at the cylinder. if it's scored, you broke a ring somewhere and you can write that clinder (and probably also the piston) as a loss. if that's the case, you may want to be very careful w/ the engine. if pieces of piston rings went inside the engine itself, you may be in deep trouble.

call handybikes, or check online for piston rings. you may end up needing a whole tope end. do not even try to start that moped until you have rings on that piston. you will ruin your bike.

also, be sure to specify what kind of moped and engine you have. not all mopeds are the same. they have different size pistons and rings and cylinder and everything else. be very specific.

but, yes, to keep emphasizing what everyone else has said: you need rings on that piston.

Re: Piston Rings

Ron Brown /

Steam???

Re: Piston Rings

Chris Robertson /

I would love to see a steam powered moped! I suppose you'd have to tow the boiler and hopper on a trailer behind the ped. It might also take a while to start it up every morning...

Chris.

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