oceanvibe Posted July 4, 2005 Report Share Posted July 4, 2005 On my 02 250 pro I am having major problems changing down from 5th to 4th. Goes up the box nice and smooth and in and out of all other gears fine but when I try to go back down to 4th it either goes into a false nuetral or the shifter moves loads but nothing happens. I have to kill the engine and gentle rock it back and forth while moving the shifter before it will go down to 4th. Once there all is fine again until the next time I have adjusted the cam screw with no effect. I have been running it on dextron III and changing it every 2-3 weeks. I was told when I bought the bike that it had the '03 gearbox mod.' but ithat just the spring that should be red, if so mine is not red but it seems to be ok. Would a worn selector fork be at fault and is that easyto do ? Also should I stop running the bike until fixed or just don't go above 4th until then. Any help please. Quote Link to comment Share on other sites More sharing options...
gasgas Posted July 5, 2005 Report Share Posted July 5, 2005 Oceanvibe, i have this problem going from 3rd into 2nd. Upshifting no problemo, back almost everytime trouble. I also checked the camscrew with no succes. I just keep on riding it, untill i plan on opening the cases. Then i probably find a worn/bend shifterfork. Sorry i can't help at the moment, but in a few months time i can Quote Link to comment Share on other sites More sharing options...
spike2450 Posted July 5, 2005 Report Share Posted July 5, 2005 hi I've only had my 2002 280txt standard for about 2 weeks, and i've noticed that i also hit a neutral the same. When i'm riding and also when i checked the bike over stationary before purchasing. (probably not a problem at the moment for me as a novice). Quote Link to comment Share on other sites More sharing options...
jtt Posted July 5, 2005 Report Share Posted July 5, 2005 Sounds like it could be a worn or bend shift fork or drum. I'd just be aware of it and take care shifting till you can get the time to open it up and verify the problem. For what it's worth, these motors are lovely to work on and easy to split the cases on. Tranny is simple and easily accessable. Quote Link to comment Share on other sites More sharing options...
spike2450 Posted July 5, 2005 Report Share Posted July 5, 2005 Checked my bike tonight and the 280 2002 txt standard is fine going up the gears but coming back down hits a false neutral between 6th and 5th gear, not really a problem for me, but what are the possible causes and could it escalate to further problems ? Are there other known problems with this bike that i need to look for? I am so far very happy and impressed with it. Quote Link to comment Share on other sites More sharing options...
oceanvibe Posted July 5, 2005 Author Report Share Posted July 5, 2005 Had another wee mess about with the cam screw today, I was adjusting it to much at a time. A bit better than befoe but not totally sorted. Can now get from 5th to 4th if I slow down to a point that the bike is labouring then change down without the clutch ! It is better than nothing as I have a 2 day trial this weekend and don't have time to open it up. WIll have another go at the cam screw tomorrow and see what gives. I think deep down I know I'll have to replace something inside but time will tell. Quote Link to comment Share on other sites More sharing options...
perce Posted July 5, 2005 Report Share Posted July 5, 2005 Try this - when it fails to change down put your foot under the lever & lift a little bit. Not enough to change back up! Just a little touch. It should then change down no problem. Quote Link to comment Share on other sites More sharing options...
gasgas Posted July 6, 2005 Report Share Posted July 6, 2005 Yes, sometimes that trick works. I do it myself going from 3rd into 2nd. Quote Link to comment Share on other sites More sharing options...
oceanvibe Posted July 11, 2005 Author Report Share Posted July 11, 2005 Well after my last adjustment on the cam screw it jammed in 5th and would not move. With th eMull 2day only 2 days away I had no choice but to strip the bike and split the engine. When I took the gears out I found that the end of the selector shaft was broken off, the spring loaded cam bits and the bits were stuck in the gears. Managed to get a new one same day and put it all back together, ajausted the cam srew to set the gear selection and it is like new , shiftssweet as a nut now. All in all it took about 8 hours which is a pain as once I had the engine on the bench splitting and fixing it only took about an hour, it was stripping the bike down to nothing to get it out then putting it all back that takes the time. The job itself is a doddle. Word of warning, weeks before the bike had had trouble shifting the odd time but never thought much about it, it must have been on it's way out. If theis par had got stuck in the gears while I was running it it might have caused a lot more damage, so if your bike is not shifting right it might be better to fix it before you cause more work. Anyway I got it sorted before the 2 day, just, so was well happy. Thanks for the advise. Quote Link to comment Share on other sites More sharing options...
gasgas Posted July 12, 2005 Report Share Posted July 12, 2005 Thnks for the update, Oceanvibe. Will act accordingly and split cases this month. At the moment i am fixing my mx-bike and once that is done, the GG is next. Yoy didn't make piccies, did you? Quote Link to comment Share on other sites More sharing options...
jtt Posted July 12, 2005 Report Share Posted July 12, 2005 The job itself is a doddle Pretty slick engine to work on isn't it? Glad to hear you got it sorted. Quote Link to comment Share on other sites More sharing options...
gasgas Posted July 17, 2005 Report Share Posted July 17, 2005 Guys, i reckon i can leave the clutch alone and split the cases without removing it. Am i correct in thinking this? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.