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Wondering wer i can get the cylinder re sleeved or get a hole new cylinder .or is the a cheap way of fixing it ther is 1 score mark in the cylinder of my 1991 kx 125
If your going to the trouble of replacing the cylinder - wouldn it make sense to replace it with a quality part ? You really should do new piston & rings while your at it..
If not - you might be doing it again allot sooner than you would like..
Your local bike shop should be able to get one for you..
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Honestly - it's just as cost effective to just buy a new cylinder complete from Yamaha - unless you have a lot of porting done to your cylinder. The cylinders are plated and you typically don't bore them - you have them re-sleeved.
I have raced semi-pro for many, many years (AMA District 13, A-class). When I raced 125s (1998-2002) I would usually go through 6 to 8 cylinders per season and I would rebuild the engine after every race (every week). I never bothered getting the worn cylinders resleeved because the sleeves cost almost as much as a new cylinder from Yamaha.
Price out a new cylinder then price out the re-sleeve. You'll see there's only a slight difference. I recall the new cylinders being about $245 and a sleeve was around $225.
Once you get it rebuilt, keep the ring fresh and make sure you run at least 28:1 mix. I raced at 26:1 to get the engines to last. They are single ringers and the piston ring just doesn't last. Yamaha recommends changing the ring every 2.2 hours for maximum output. I couldn't get 2 hours on a motor running 32:1, so I switched to 26:1 for more lubrication and better sealing of the ring. Long story.
I would be checking compression it may not be visible score on cylinder but it does not take much to loose compression on small bore motor with one piston ring and 11 years old
Yes, that is a plated cylinder so if it galls, or wears out, it cannot be bored out you have to put a new sleeve in it. The new sleeve will be able to be bored out so it will last for a long time. The resleeving is best left to a cycle shop or machine shop with the propper equipment, as it is an interfearence fit and the cylinder must be bored perfectly, then heated in an oven to be able to install the new sleeve.
If you say it is definately sleeved it should be possible to bore it, you normally get one or two oversizes before it needs resleeving. If you are able to buy an over size piston from kawa or wiseco, chances are it can be bored.
Hi
Just to confirm with you... looking for a piston kit, barrel, and topend gasket kit for your 1991 kx125?
Where in the world are you?
regards
robotek
Get a new NGK spark plug one heat range hotter than stock. Be sure the fuel mix is 32/1 using two stroke engine oil ( not motor oil ). A 32/1 mixture equals 4 ounces oil to 1 gallon of gas. Remove the cylinder head and de-carbon the top of the piston and head.
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