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SP1000 Broken shifter return spring

profwacko

Cruisin' Guzzisti
GT Famiglia
Joined
Oct 28, 2008
Messages
122
Location
Austin
I have an '83 SP1000 on my lift with the frame crabbed.

It is stuck in 2nd or 3rd gear, I am told by the owner (a buddy of mine) and we are guessing that this is caused by a broken shifter return spring.

This bike rode and shifted really well last I was able to test ride it a few months back. The bike has about 95k miles on it and seems to be in pretty solid overall condition.

My questions for The Illuminati are as follows:

1. Since the gearbox is still attached to the engine, is it possible to remove the output shaft nut without the special tools shown in the V1000 G5 SP1000 service manual (pg 70)?

2. How much more complicated is it to get the cover off of the gearbox, considering that I cannot get it into neutral?

3. How likely is it that all I will need to do is replace the return spring to get this gearbox shifting again?

4. Should I just cut my losses and take the gearbox to Mike Haven to repair?

ADVthanksANCE

-Jack (shiftless in Bastrop, Tx)
 
A rattle gun and deep socket will remove the shaft nut.

When this happened on my SP, I managed to replace the spring (which was broken) by just removing the back cover, though it was very fiddly to do, so I'm not sure I would suggest others tried it.
 
It would be best to remove the gearbox from the engine. When you remove the output nut be sure to nut misplace the little steel ball. If it isn't in neutral doesn't matter, you will just lift the gear shafts and shift drum until you can free the shift drum from the pawl. To be stuck in gear may be a bent shift fork and not the return spring. You should be able to manually re-center the selector and change gears if the spring were broken. Once you get stuck in gear sorted, I would go ahead and replace the input and output bearing with steel cage bearings. The bearing is a 3205, 25x52x20.6 If you don't have the special tools to remove the hub gear, I'd suggest taking the gearbox to a place that does.
 
I should have said the bike will only shift between 2nd and 3rd.

It is not stuck in one gear, which is why it's likely that the only issue is the return spring.

When does the little steel ball fall out? is it when you remove the output shaft nut or when you actually remove the cover?

The ball is the key for the speedometer drive gear, right?
 
My experience with a broke return spring is different.

The shifter would kind of flop down & feel loose.
I could get it to change gears but it was like trying to flip pancakes with a rubber hose.
 
I should have said the bike will only shift between 2nd and 3rd.

It is not stuck in one gear, which is why it's likely that the only issue is the return spring.

When does the little steel ball fall out? is it when you remove the output shaft nut or when you actually remove the cover?

The ball is the key for the speedometer drive gear, right?

If you can shift between gears and the lever moves to a center position then it isn't the shift return spring. The little ball can become lost when you remove the nut, but more likely when you remove the speedometer drive. One of the splines on the output shaft is much longer and the little ball rests in that groove and an indentation in the speedometer drive part. It really sounds like you haven't been in one of these 5 speeds. I suggest you take the gearbox to someone that is familiar with them, or get assistance from someone who is so you can learn how to go into them. Again it is sounding like a problem with a shift fork, or shift collar.
 
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