Grand Prix 250
Main Motorcycle: Daytona 955i
Join Date: Jun 2006
Other Motorcycle: T140 1973
Primary Chain adjuster
This is on a 1973 T140. The primary chain was making some noise, so I took a look at the adjuster, and the adjuster rod threads were completely worn away so the adjuster nut was presumably slipping back under pressure, I ordered a new rod and nut, firstly the new nut (the tube like adjuster) was slightly bigger diameter and wouldn't fit in the crankcase hole, so I turned it down a little on the lathe. Next as I tightened up the new adjuster it gets to about half way down the threaded part and sticks... The new rod now has damaged threads aswell! I eventually broke the rod by forcing the adjuster nut!
Has anyone else experienced this? I think maybe the small cylinder with a hole through (goes into the adjuster blade) it is damaging the threads, it also looks to have an oval shaped hole through it so maybe I should replace this aswell?
The other question I am asking myself is whether the chain itself is too loose and worn and the adjuster is having too much pressure put on it and therefore damaging the threads... Ho bent should the adjuster blade get to adjust the chain correctly, mine is quite bent I need to take a photo? When can you tell if the primary chain is passed useful life?
Thanks for any help.
Last edited by DaveG; 06-27-2019 at 03:56 AM.
Reason: spelling mistakes