1 1990 K100LT intermediate "whacking sound" while running. Thu Nov 03, 2016 5:13 pm
Banzaibob
active member
K100LT with 48,000 miles. Bought it after is has sat for 5, maybe 10 years...who knows. Cosmetic condition is poor, overall I'm still evaluating this bike to see if it is worth restoring. Finally got the fuel pump issues sorted out and got it started today. At just over idle (and intermittently during idle somethings) there is a sort of slapping sound. It is not the deep resonant knock of a bad rod or the thin ticking of a loose valve train, but a clacking sound. My first thoughts? Cam chain. After removing the cover and exposing the cam chain everything looks rather normal. However, it appears that the automatic adjuster can be pushed back with finger pressure. Is this right? Also when turning the starter motor over is the cam tensioner device suppose to hold the chain taut?