I have a Pre-unit with a 4-speed slick shift transmission. This weekend I finally got a chance to take out of my neighborhood and get in the wind a little (not registered yet :p ). It's doing some strange things when shifting...
First, I have a hard time getting it in neutral sometimes. Not too bad, but noticable.
Second: When I'm shifting from second to third it doesn't act right. It feels like I'm going back to First??? HUH??? The RPMs spike and the bike slows/lags big time.
Is this just lack of understanding the slick shift transmission, or is something going on here? Maybe it's just me, the user, but it doesn't seem right to me.
Not being able to find neutral is generally a clutch thing. Make sure you plates are straight, not sticking, and adjusted correctly.
Definately go with the upgrades that redneck suggested. They are well worth the effort.
As far as your third gear issues are concerned, I don't really have a suggestion. It is not possible to mismatch the parts that much and still get the box together.
The 'slickshift' bit of the gearbox won't effect your shifting if you use the clutch. I would be surprised if the mechanism is still active. Most of them were removed (simple to do). As a matter of fact, out of all of the slickshift bikes I have owned, only one still had it in there! (ironically it is the one I currently use as my daily bike)
Hmmm... thanks for the tips. More info than needed, but things I will definitely think about for the future. I'm thinking of pulling it of the frame this winter and polishing the cases, covers and maybe I can make the upgrade at the same time. What are the part numbers for what I need to order to make the conversion and what should I expect for machining work? Any "how-to" articles I can reference when I do go to do this?
As far as the shifting thing, I think the mechanism is still in there... I will use the clutch anyway though. I know it's not possible to mis-match parts in that tranny, that's why I can't figure out what kind of weird voodoo is going on.... probably just need to mess around with it more. I suspect user error!! :p
Thanks for the tips guys. Any more info available on the "not-so-slick-shift" transmission would be great.
Re: Pre-unit transmission gremlins (or just the user)#83896 09/27/051:19 am09/27/051:19 am
info so far i can't add to but the slick shift does work great if the clutch is set up right and the push rod is correct length. i've used one for years and fool people at traffic lights into thinking i'm not ready for the off when they change as i still have just one hand on the bars (at the throttle end). gently open throttle and lower gear lever and we're off. it's great for short shifting too. people found it weird when changing gear when the lever operated by itself, a lot more couldn't be arsed setting the clutch up, so it was discontinued
my 2 bobs worth
Re: Pre-unit transmission gremlins (or just the user)#83899 09/27/052:55 pm09/27/052:55 pm
I went for a ride last night and messed around with shifting a little more. I used the clutch going into 3rd and everything seemed fine. User error is the hardest thing to diagnose!! :p
I got to thinking more about my clutch though... I have a feeling it's slipping just a little bit. I got to talking with a buddy last night and he made a comment that after he got his clutch all installed someone told him that he should have soaked each of his plates in oil for 10-minutes before installing. Is this true? I didn't do this either. I put the new plates right in out of the box. I have to pull the primary cover again because I have a little leak, maybe I can check this out when I have it off. What do you guys think?
Re: Pre-unit transmission gremlins (or just the user)#83900 10/02/053:16 am10/02/053:16 am
I just installed brand new clutch plates in the '57 Thunderbird,and I soaked them in 20wt fork oil for a few minutes each plate.Then I drained and dabbed the excess off and installed them as well as scuffing up the steel plates with 220 grit.I also checked the plates on a flat glass surface to make sure they weren't warped, everything checked out.We'll see how it works!
Put as much oil on as you like. The spinning clutch slings out all the excess in the first minute. The light weight oil in the primary should just barely have the chain dipping into it. Check it with a flash light. Twice.