SOHC.co.uk Forums > CB500/550

5th gear jumping

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Steris:
Whilst trying to sort my carb issue out I went for a run up the dual carriageway to do a plug chop, all going well  until I was in 5th, after a few miles it started jumping,  it gives the impression its jumping back into 4th momentarily,. But its sporadic,  itll go 2 or 3 miles without jumping then jump a few times then ok again. Is it possible its dropping back into 4th momentarily or could it be a clutch issue?  Only does it in 5th..

Bryanj:
More likelyto be worn gear dogs, selector or broken shim

Steris:
Engine out and on the bench, found the middle selector fork really badly worn and has obviously been very hot at some point, 5th gear dogs only meshing by about 2mm. So that's why its been jumping.  Found a complete CB350 twin gearbox on Ebay with as new forks for £60 so happy days.. then it'll be back to sorting the carbs out 🤣🤣

Bryanj:
Thats about the only bit thatwears on the 500 ans,as you found, not easy to get new.
Carefull assembling the cases, make sure the bearings locate on the pegs and while you are in there check the primary chain as on the 500 it eats into theoil gallery when worn

Steris:
Hi Brianj  thanks for the advice,  I replaced the primary chain when I rebuilt the engine earlier this year.  I noticed the worn fork then but it didn't look too bad and was selecting 5th gear ok on the  bench.  Only done 150 miles since the rebuilt,  you live and learn 😁😁😁

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