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By Dennis O
#1490
Some time ago I asked about fitting a 20 tooth gearbox sprocket to my Electra 500 so to make the bike more relaxed and out of the vibration period when touring at 60 mph.
I have completed the job now and after a short ride everything appears to be OK and the bike still pulls strongly. As I had fitted a 19 tooth sprocket earlier along with a 96 link chain I did not need to change the chain. I also fitted our hosts primary chain adjuster and clutch pad with bearing and 20 tooth gearbox sprocket and new primary chain.

I would like to warn anyone who is thinking to do the same mod about a problem I encountered.

On my machine when putting on a 19 tooth sprocket I saw that the chain split link pins had been rubbing on the back of the inner case. I decided to place the spit link on the inside of the chain as I have heard some bikes from the factory are delivered this way and I did not encounter any problems over the next few thousand miles.

Every went well and I rebuilt the bike along with the larger sprocket and adjusted the rear chain. On spinning the rear wheel I found the split link pins were catching on a engine stud that stuck out beyond he nut by about 1/4 of a inch. I stripped down the bike again and cut off the protruding stud down to the retaining nut and built the bike up again. The 20 tooth sprocket and chain hid this stud so it is best to fit the rear chain and check everything before putting on the rear chain-case.
By Frank
#19868
Even with the 19 tooth spocket I found the chain ran perilously close to that stud. By splitting the chain and running it off the front sprocket, hooked on a piece of wire to aid refitting, i found just enough space to get a file and dremel grinding tool down there to shave a few mill off. Saved a lot of work stripping it down again. May not be possible with a 20 tooth though.
By Dennis O
#19880
Hello Frank, Thanks for your input to warn others of this problem stud when fitting a larger gearbox sprocket. I think you are right in that it would not be possible to get in behind the 20 tooth sprocket to cut off the protruding stud. At least others now know.
All this started because I wished to ride down to France to see the Millau Bridge.

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