IMO it would depend on how bad your rings were that you replaced and what the cylinder looked like. If it were me I would get a little bit bigger piston from Wiseco in the kit that comes with rings and everything and have the cylinder honed and bored to fit it. You may be able to just get bigger rings and have the cylinder honed and board for those which i believe should fix it if it is losing compression through the rings.
400ex wont start after re-ring.
Hey guys first post on here. I've had my bike for about 4 years and I re ringed it friday. Everything went good and we gotter back together and now it won't start and run. You can hit the throttle about halfway down and it'll will like sputter everytime the motor turns over but it never will catch and run. Can anyone help me with this problem. I'm in desperate need of it to run. We gotta get some cows up. Thanks in advance.
Pitman
Pitman
21 - 33 of 33 Posts
If you bore it, you will have to get over sized piston and rings, both.
The cylinder was scared at all from the rings goin out. It was smooth as can be. We used a cylinder hone to scuff it up a hair and installed the new rings
Okay so tonight we compression tested it. It got upto 90lbs and I got another q....we shot it with a small shot og ether and then I smelled the crank case (took the timing plug outta the side) and it smelt like ether. Is there supposed to be pressure in the crankcase?
You did install the rings correctly didn't you? there is a up and a down to them.
Ya we installed them with the n facing up
There shouldn't be any pressure in the crankcase, while it's not running. There will be a little pressure if it's running.Okay so tonight we compression tested it. It got upto 90lbs and I got another q....we shot it with a small shot og ether and then I smelled the crank case (took the timing plug outta the side) and it smelt like ether. Is there supposed to be pressure in the crankcase?
I don't like to use ether as it tends to wash the oil off the cylinder walls.
IF you ringed it correctly and cleaned the cylinder up good you should have more than 90 on the compression I would think? maybe somewhere around 110 to 130? you may have an issue in the head?
I'm thinkin about tearin it apart and puttin it all back together again!
If you do tear it all down I would go ahead and take the cylinder with the piston to a machine shot to see if they think it needs anything done. The smallest amount of wear can cause some pretty big problems.
AGREE!!!!!^^^^^^^^ saves on headaches too!!
I think I might just do that...-t aint hard to get that wrist pin out is it?
No, it's not too hard to get the wrist pin out. Just remove one of the circlips and tap it out that side of the piston. If, for some reason, you can't get it out that side, then remove the other circlip and tap it out that side. Just don't tap it too hard, so you don't damage the rod bearing.I think I might just do that...-t aint hard to get that wrist pin out is it?
21 - 33 of 33 Posts
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