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R90/6 slipping in low gear
- cbclemmens
- Posts: 220
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R90/6 slipping in low gear
The starter relay burned out on my R75/5 and I ordered a new one from Max. $183!!! While I wait for it to get here I boogered a wire from the solenoid to under the seat. To crank the starter I just touch the wire to the battery. Starts fine.
Craig
- schrader7032
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Re: R90/6 slipping in low gear
Yes it's possible to remove the transmission without removing the engine. You would need to remove the battery and tray. Also remove the exhaust headers and muffler...be careful of the exhaust nuts potentially galling if the anti seize is not working. Remove the airbox. Remove the clutch cable. Then you can loosen the motor mounts and use a jack to raise the rear of the engine/trans. Once at an angle, you can loosen the transmission mounting bolts and slide the transmission out along that angled axis and then out of the bike.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- cbclemmens
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Re: R90/6 slipping in low gear
I found a manual in the club library with comprehensive instructions. Unfortunately it appears to require several special tools.
Thanks for your thoughts.
Craig
Re: R90/6 slipping in low gear
- cbclemmens
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Re: R90/6 slipping in low gear
I already have the relay in, but thanks for the reference.
Re: R90/6 slipping in low gear
I have no idea, but you could ask. It's Bob's Motorwerks in Robert’s, MT. 406-445-2044. I just read that Mat Parkhouse in Colorado Springs was rebuilding some transmissions to sell, but I don’t know what he would have, nor do I have contact information for him. Maybe there is some on the airhead site. Good luck. Also, Tom Cutter might have an idea for you.cbclemmens wrote: ↑Sun May 01, 2022 3:28 pmDoes your brother possibly have a used or rebuilt 5 speed R series transmission laying around that he would swap out?
I already have the relay in, but thanks for the reference.
Re: R90/6 slipping in low gear
If it occurs in all gears, then I’d suspect something has broken in input shaft gear and “spring“ assembly. Those have also been known to fail and would cause a slipping problem in all gears.
Either way, the transmission needs to come apart. Have you drained the oil to see if any parts come out with the oil?
Have you checked Snowbum’s site? It’s long and you can skip the parts about the circlip issue on the later five speeds.
There are a few independent mechanics on the east coast who do Airhead transmission work.
https://bmwmotorcycletech.info/transmission.htm
Seattle
- cbclemmens
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Re: R90/6 slipping in low gear
Re: R90/6 slipping in low gear
This condition MAY also be attributable to a BEARING begining to self destruct.
Ask me HOW I KNOW....