TwinJet1077 Posted October 22, 2013 Share Posted October 22, 2013 Hello all, So here is a little description of my issue with my Yl-1. I have only ever worked with single speed or two speed automatic two-strokers in the past. I apologize for the length of this post. I just want to be detailed. Once I got her running I noticed that there was serious slipping when in 4th gear (4 speed bike). I left this be while I sorted other things out, Eventually I noticed an issue where I would be shifting into 4th and I would end up back in neutral, then when I would try and shift up again I would end up in 1st gear. About two weeks ago I rebuilt the clutch and eliminated the slipping in 4th gear, however now I have a more serious issue where I completely lose the ability to shift.. let me elaborate... I will be riding for about 20 minutes or so and then I will go to shift from 3rd to 4th and nothing happens. then I cannot shift at all, up or down, I will just be stuck in neutral.. no response from the shifting lever at all, no clickin in or out.. nothing... My only though is that it must have something to do with the tranny fuild I'm using, possibly something is happening when it gets heated up.. (10w-40 conventional for wet clutches). after it sits for a while I will be able to shift again... Any advice would be GREATLY appreciated. Thank you Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted October 22, 2013 Moderator Share Posted October 22, 2013 Moved from the Bar to the classic section. I would say that it was more to do with the shift mechanism than oil. Shift arm spring or an issue with the neutral stopper would be my guess. Link to comment Share on other sites More sharing options...
TwinJet1077 Posted October 22, 2013 Author Share Posted October 22, 2013 Thanks, sorry for wrong section Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted October 22, 2013 Moderator Share Posted October 22, 2013 No worries. Please see my answer above for my thoughts. Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted October 22, 2013 Moderator Share Posted October 22, 2013 I don't have a workshop manual for your bike but a lot of these early Yam's had an adjuster screw which can be used to adjust the shift. It is by the gear shift arm. Link to comment Share on other sites More sharing options...
blackhat250 Posted October 22, 2013 Share Posted October 22, 2013 Dirty is on the right track,,, shift pawl / return spring .etc. why you got ATF in box,,, put in correct SAE. it will help ,,, Welcome bye the way... Link to comment Share on other sites More sharing options...
TwinJet1077 Posted October 22, 2013 Author Share Posted October 22, 2013 Yeah there is a nut that is accessible from outside the case. I do recall this being related to the spring.. Should I just loosen it all the way and just turn it a bit at a time? Everything was very clean when i popped the clutch side open.. Link to comment Share on other sites More sharing options...
TwinJet1077 Posted October 22, 2013 Author Share Posted October 22, 2013 Return spring would make perfect sense. I'll take a look at it after classes tonight. Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted October 22, 2013 Moderator Share Posted October 22, 2013 If it is not a spring then look at number 4 in the first link. The numbers are hard to read so the part that fits to number 5. LINKY Second part of the shifter mechanism LINKY Full parts list LINKY Link to comment Share on other sites More sharing options...
TwinJet1077 Posted October 23, 2013 Author Share Posted October 23, 2013 Thanks DirtyDT I really appreciate all the info. I'll let you know what happens Link to comment Share on other sites More sharing options...
TwinJet1077 Posted November 3, 2013 Author Share Posted November 3, 2013 ok here is an update. I took it out and rode around till the problem started. Then I proceeded to adjust the clutch to see if I could get any change... What I found was that if I adjusted the adjuster screw or the cable adjuster to anything but fully tight the clutch slipped when I started to ride. What I don't understand is how the rod that the shift armature is supposed to return to the original position, unlike the schematics you linked there is no visible return spring(or signs of one being absent) I will post pictures so that hopefully you can see the difference. Link to comment Share on other sites More sharing options...
TwinJet1077 Posted November 3, 2013 Author Share Posted November 3, 2013 Also the adjuster screw and single ball bearing were in during testing( just out during picture) I am trying to understand how this all works from the schematics but i cant even find the rod in any of the schematics available Link to comment Share on other sites More sharing options...
YPVS TONE Posted November 3, 2013 Share Posted November 3, 2013 If you mean the clutch pushrod which is seen in your second photo just in front of the front sprocket this is shown under the clutch section in the parts list as number 8 Rod push (2). This relys on the springs number 22 pushing against the pressure plate number 21 to return the pushrod to the normal position when you let the clutch lever out. Link to comment Share on other sites More sharing options...
TwinJet1077 Posted November 3, 2013 Author Share Posted November 3, 2013 O geez that makes so much sense... so that wouldn't have anything to do with my issue.. Basicly I have no choice but to split the case. Link to comment Share on other sites More sharing options...
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