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86 lt250r rebuild help
Posted by
Wheeling
on 23 Jun, 2013 11:09
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rebuild is in the process. all is well UNTIL I put the cylinder on the motor. The piston jams at close to the top of the stroke! then it just seizes up until I knock it out. BUT WHAT IS CAUSING IT TO JAM IN THE CYLINDER???
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#1 Reply
Posted by
LT250RWV
on 23 Jun, 2013 11:55
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Can you take some pics of it. Is it the right piston? How done the bore?
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#2 Reply
Posted by
Wheeling
on 23 Jun, 2013 12:07
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Can't see how pics will help can't really see anything it's the exact same size piston that came out I'm just replacing the piston and rings but it turned into a headache!
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#3 Reply
Posted by
LT250RWV
on 23 Jun, 2013 12:57
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What kind of piston is it? Are you getting the rings into the metal taps on the piston? Pic could tell us if something is wrong your not seeing!!
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#4 Reply
Posted by
JayTater
on 23 Jun, 2013 13:51
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Was the cylinder ported, and were the ports chamfered? Sounds like a ring is catching the lip of the exhaust port..
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#5 Reply
Posted by
Wheeling
on 23 Jun, 2013 16:06
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Nothing was changed old piston and rings out and new piston and rings in!
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#6 Reply
Posted by
Rider414
on 23 Jun, 2013 19:01
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Do you have the ring gaps aligned right? Is the arrow on the piston facing toward the exhaust?
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#7 Reply
Posted by
Wheeling
on 24 Jun, 2013 05:13
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I have the gaps at the little pins and yes the piston arrow is facing forward
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#8 Reply
Posted by
LT250RWV
on 24 Jun, 2013 05:36
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Did you try the old piston back in again to see if it went in fine. Have you check your new rings inside the cylinder to see what the gaps are. If you havent, check them in the top and take the piston threw the top with no rings and use it to push the ring down the cylinder.Check the top and middle and bottom. Also have you measured your new piston. Hope this helps you.
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#9 Reply
Posted by
Wheeling
on 24 Jun, 2013 08:03
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Ive measured the piston and its the exact same size that came out. Ill try the pushing it thing. Sadly im only home on weekends. Work during the week. so I cant try anything till Friday evening.
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#10 Reply
Posted by
GrkGuy
on 25 Jun, 2013 12:51
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sounds like one of the rings is not lined up with pin.
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#11 Reply
Posted by
Zilla273
on 25 Jun, 2013 16:33
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have u tried turning it over with the base gasket bolts loosend? if piston is the same and the rings are aligned with pins and bottom end wasn't disassembled, u may have a bent rod
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#12 Reply
Posted by
Wheeling
on 25 Jun, 2013 16:52
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I will look into everything suggested this weekend when I get to work on it.
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#13 Reply
Posted by
Wheeling
on 29 Jun, 2013 12:51
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Found the time to go work on her. It seemed to go well my only problem now is I cant get the rings to stay on the pins? whenever the cylinder is installed the the rings around the piston aren't even all around. I assume because there on top of the little pins? So how do I fix this?
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#14 Reply
Posted by
JayTater
on 29 Jun, 2013 18:12
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Hope the rings didn't distort or scratch your cylinder... Usually, its pretty simple to hold them in place by hand while you're dropping the cylinder into place.
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#15 Reply
Posted by
Wheeling
on 06 Jul, 2013 12:14
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SHE LIVES!!!!!! Somewhat....... It starts just doesn't want to idle I have to keep giving it gas to keep it alive. I'd normally take it for a drive to clean out but I was hoping to do a few heat cycles before taking it for a drive. What do you guys suggest? Btw putting the choke on just kills the motor.
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#16 Reply
Posted by
Wheeling
on 06 Jul, 2013 15:12
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Carburator was cleaned well and my pilot is a 57 it worked well before the rebuild
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#17 Reply
Posted by
Andys92
on 06 Jul, 2013 18:40
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57 pilot , wow that sounds big!! i run 37.5 and that is still very slightly rich ,
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#18 Reply
Posted by
Wheeling
on 06 Jul, 2013 18:50
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That's what I thought to! Do you have similar mods as my bike has?
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#19 Reply
Posted by
Andys92
on 07 Jul, 2013 11:37
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only difference i had was i had a stock filter with lid.
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