Got sleeve honed and a bigger piston and immediatly destroyed it

[Kibblesnbits]

Didn't use a ring clamp cause I never needed one with my Hondas but the skirt has a weird shape on the 96 KQ300, anyways I hand cranked it twice and that was enuff I guess, I had to send it back in again. Another 200 down the drain, thought I'd share.

[Mech]

Well the oil ring didn't get that damaged being fitted...  So what happened to it ?

[Kibblesnbits]

Didn't have it fully tucked in and tapped it in with some muscle, as I did it I thought it was way to tight but I couldn't see that rings sticking out so I thought I was good.

13 minutes ago, Mech said:

Well the oil ring didn't get that damaged being fitted...  So what happened to it ?

Didn't have it fully tucked in and tapped it in with some muscle, as I did it I thought it was way to tight but I couldn't see that rings sticking out so I thought I was good.

[Mech]

Youch..

Most bikes you hardly need a ring compressor, and on a lot of them a ring compressor won't work, or at least, a lot of ring compressor designs won't work on them, because the sleeves have a big gentle taper at the bottom.. 

It was probably caused by letting the barrel lean over on the piston as it was going on, pressing the ring in on one side and allowing it to pop out on the other side. You need to get two fingers in under the piston to hold it flat as you slide the barrel down over it.. 

[Kibblesnbits]

7 minutes ago, Mech said:

Youch..

Most bikes you hardly need a ring compressor, and on a lot of them a ring compressor won't work, or at least, a lot of ring compressor designs won't work on them, because the sleeves have a big gentle taper at the bottom.. 

It was probably caused by letting the barrel lean over on the piston as it was going on, pressing the ring in on one side and allowing it to pop out on the other side. You need to get two fingers in under the piston to hold it flat as you slide the barrel down over it.. 

Interesting, I do recall the piston going in at a slight angle, I think I'll try to make a forked wedge to place between the piston and lower engine to keep it strait cause both the sleeve and the piston moved around to much when I was try ING to reinstall, guess I got spoiled with my Hondas lol

[Mech]

Yeah a coupe of bits of wooden beading or something laying across the crankcase would keep the piston flat..  Two fingers do work though.

[Kibblesnbits]

26 minutes ago, Mech said:

Yeah a coupe of bits of wooden beading or something laying across the crankcase would keep the piston flat..  Two fingers do work though.

Well I will certainly be more careful this time around, cant afford to do this again haha, thank you for the advice.

[Mech]

Yeah nah..  that's a bummer alright..  You'll get it this time.

My son's just working on a crf, a four stroke motocross bike, and it's piston is huge and only about thirty mills high to the bottom of it's skirt..  and the skirt is all cut away except for the two sides. That will be a tricky one.. 

[Gwbarm]

Sorry to see this , I have always been afraid of breaking rings and never even thought of this happening, I never use a ring compressor either I have tried them and do better with fingers.