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Gear Box not shifting properly on CARC bike

Rafael

Rafael

GT Reference
Joined
Feb 16, 2009
Messages
1,096
Location
San Leandro, CA
Well my '06 B11 has been working flawlessly until last Saturday.

I rode to a friends house, about 25 miles away - no problems. We left about 3 hours later for a ride and lunch, it shifted fine in low speed traffic, but as soon as we reached the freeway approach. It would not shift into second. I let off the throttle and was able to shift into second. The same occurs with 3rd, 4th, 5th and 6th gears but not all the time - seems to resist shifting under quick acceleration. Down shifting is not a problem.

Since this bike was sort of a barn find and did exhibit these symptoms when I bought it at 10k, I thought that maybe I had forgotten to change the oil, but not so. The oil only has 4800 miles on it - Lucas synthetic. But I will change the oil anyway to see if that helps. When I purchased the bike in '10, I changed the oil at the POs house to see if it would shift correctly and it did, It has 46k miles on the clock.

Any info would be appreciated. My knowledge of gearboxes is relatively limited.
 
Oil wears out. Changing it may be all it needs. There are better oils out there than Lucas. Most of them, actually.
Bare
 
I have a similar issue on my 12 norge with second to third ony on up shift and have checked everything external. No faults found. Not going to worry until I have to do other work there.
I have had a friends norge 12 box apart to change ratios and check the shifting fault he had and found one shift fork worn to the extent of requiring replacing. Not bent just severly worn on one side suggesting prolonged pressure against the gear too often. Changed that, assembled and customer has no complaints now. Revs heaps slower at 120k now. A proper 6th gear at last
They suggest dont use additives.
Anyone know why?
 
Hadn't ridden my bike in a week. I took her out for a short ride to warm up the oil and found, to my surprise, that the shifting was normal. I changed the oil anyway and found the used oil a bit dirtier that usual. Filled up with Redline 75w90.

I'm happy the gearbox doesn't need tearing down, but I hate a mystery but trusting suspect equipment is worse. Guess I have to go for a long ride.

edit: Test rode on the freeway and shifting is still good. Did some hard acceleration shifts. Seems Bare is right. Has anybody else had a problem with Lucas Oil? 4800 miles seems way too short for the break down of the oil. I've used Mobile 1 and Lucas in the past w/o problems.
 
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