another 88 cr 125 ?

team466
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9/7/2011
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Block Island, RI, USA
team466
Edited Date/Time 3/26/2012 8:35am
We got the whole bike back together last night and ran it on the stand in the driveway motor runs awesome.We did a total rebuild on the motor,cases split rebuilt bottom and top end. I did remove the transmission and checked all the gears. Today the boy takes it down the driveway runs good thru two passes. On pass 3 he lugs it going into second gear and the rear tire just locks up and stalls the bike. The transmission would not shift up or down. I rocked the bike back and forth and it shifted down into neutral. Started it up, I went down the driveway upper rpm range and it shifted thru the gears fine. I tried it again but this time just lugging the motor, as soon as I shifted to second I could feel the bike start to hesitate like something wasn't releasing or something was grabbing. The rear tire locked up as before,as did the shift. Rocking it back and forth freed it up.One last try, high rpm range shift thru first second third, I backed off the gas in third and as the rpm dropped I could feel that lurching feeling again, put it into neutral and placed into garage. The bike seems to shift and run fine at higher rpm but feels lurchy and locks up at lower rpm. You guys have been awesome at solving my problems, Thanks
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team466
Profile picture for user team466
Posts
27
Joined
9/7/2011
Location
Block Island, RI, USA
team466 3/25/2012 7:08am
3/25/2012 7:08am
Heeeeeelp please this is driving me nuts.
Stooperbike
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10/6/2008
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Salem, NH, USA
Stooperbike 3/25/2012 4:55pm
3/25/2012 4:55pm
I will throw in my 2cents, not trying to sound like a wise guy but do you pleanty of oil in it? It almost sound like you have bearing in there that is siezing up as you ride. When you faster the power of the motor is able to push through the seazing if that makes any sense.
I am kind of a nut when it comes to something like this, when I run into problems like this its easier for me to just pull the motor apart rather than experimenting. I am sure other would disagree but its the direction I take, sometimes it works other times it doesn't.
When you drain did you see any metal flakes?

One other idea is to put the bike on the stand with the spark plug out, have the boy spin the tire and you shift through the gears maybe you can better feel what the heck is going on.

Few Long shot ideas:
Is the rear brake locking up on you? Maybe to much fluid in the rear resivoir? Is the chain way to tight? I am thinking not since you are able to rock the bike back and forth.

thats all the nutty ideas I can think of, let us know how you make out.
Halfast816 3/26/2012 8:35am
3/26/2012 8:35am
You probably are going to be splitting the cases. I had an 88 that would shift and spin fine until everything was buttoned up then the motor would shift and spin but lock up part way around. Dissassembly and close inspection(very hard to see) revealed a cracked tooth on second gear with a larger gap between one set of teeth and smaller gap on the otherside that was pinching the gear it came in contact with. You could force it by but it would definately bind. Easiest way to determine would be to take off the chain and clutch plates shift into second or problem gear and spin the countershaft around feeling for any resistance. This will elimate the gearbox if every gear spins fine.

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