TwinJet1077

Okay so everything back together and test ran.. everything was great at first... everything is much smoother, better response and cleaner shifting.. no longer getting stuck in neutral. But at a certain point it started shifting back into neutral from 3rd to fourth again... One thing I did notice was that when I took the clutch apart the pressure plates and disks were stuck together...It took considerable force to separate them all. Could this have something to do with going all the way back to neutral from 3rd? Again, thanks for input.

Ok, So update here... Put the inner part of the clutch basket on the shaft and was able to shift again by turning it manually like suggested. Got her into 2nd and adjusted the distance between the hooks to be even on both sides. Unfortunately there is no washer with tab to bend and I don't see the typical set up for such a lock i.e. a slot on the case to hold the lock washer in place. Anyways if I crank it down I'm hoping it won't come loose again. It's not under any real stress anyways. I'll get it all back together and see what happens! Thanks again! P.S. YPVS TONE, where did you find the manual?

Yea this all makes sense. Kinda what i figured, I tried moving the drum manually but it really didn't want to budge. I was afraid something was messed up in the gear box. Anyways I will try this again and see if I can get it into first. I'll post an update after class tonight. Thanks guys.

So here is my problem. After removing the clutch basket and gaining access to the shift assembly I found the adjustment screw was loose. So I tightened it down all the way and began shifting the bike and backing the screw out a bit at a time. After shifting the bike maybe three times it now refuses to shift at all. At first I noticed that the rods in the shift drum would end up only being rotated part way, Thus getting stuck out of reach of the shift armature. Now, even though the rods are in proper position, the drum just refuses to move. It appears to be stuck in neutral as the tire spins freely,.Any help would be GREATLY appreciated.

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.

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

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.

Thanks DirtyDT I really appreciate all the info. I'll let you know what happens

Return spring would make perfect sense. I'll take a look at it after classes tonight.

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..

Thanks, sorry for wrong section

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

Hello all, Joined the forum looking forward to seeing everyone's projects and hopefully learning a lot, A few months back I picked up a 69 Yl-1 and I have been spending my spare time bringing it back to life. Lots of blood and sweat but that's what it all about. Have a question or two, but I'll save that for the correct thread!