My72D100

Afternoon everyone I replaced my timing chain in Jan. And after I have noticed a humming during accelerating and driving at normal speeds. I replaced it with a single metal chain and metal gears. I have been told by a few it might be humming during break in period. Any thought? Thanks

Archer

72 D -

A metal timing chain and gears will be louder than a nylon/metal stock one, but the difference is debatable.
The only concern would be that who ever installed it "forced" the gears on and left too much slack in the chain.

Archer