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Tick/Knock

  • Thread starter Thread starter Drummert
  • Start date Start date
D

Drummert

Guest
TL;DR: I got a knock/tick in rhythm to driving speed. Seems to be coming from the back.


After standing still for about 1,5 years, I finally got the bike kinda sorted out again, good enough to drive it. This week I was able to finally put the brake and braided lines on, this morning I tuned the ignition and this afternoon I synced the carbs. After that I took the bike for a spin.

Everything seems well, until I roll, clutch in, towards a traffic light and I feel a rhythmic tick/knock. Acutally, a big one and a tiny one quite close to one another. It reduces speed with me and the bike reducing speed, which I think rules out the engine bit, since I had the clutch in and engine idling.

My first thoughts:
1. Square tire (after standing for 1,5 years not riding. It moved location once, which would explain the two knocks instead of one).
2. Wheel bearing
3. Swingarm bearing: some guy from a shop once told me he didn't dare drive faster than 80 km/h on my bike since he thought it had a problem with the swingarm. I put it off as a "doesn't know how an old bike feels like" kinda thing. Neighbour (owner of a GS850) didn't notice anything like that. Never had any problem with that as far as I know.


What would you guys think?

Things done to the bike since last serious riding:
- Carbs cleaned, tuned and synced.
- Airbox cleaned and foam re-oiled.
- New front fork springs
- Brake calipers rebuild
- New tires (went on just before it broke down on me)
- New 4-1 exhaust.
- Ingition and valve shims checked and tuned.


Drummert
 
Im to assume this bike is the 78 750. So, im thinking the chain. Specifically the master link. Set the bike on the center stand and put it in gear. Run it up good in first or second gear and listen while pulling in the clutch lever etc etc. Also watch the chain to see if it has a slight (jumping) to it as any certain link rolls onto the sprocket. And see that the adjuster notches are matching from each side...and the chain slack is right.
 
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