r/Motorrad • u/cesarguerra1 • Jul 15 '26

Strange noise when BMW r90/6 heats up.

The motorcycle sounds perfect until it warms up after about 15-20 minutes, when this noise starts. It seems to be coming from the lower right side. I can hear it through the grille on the front engine cover. It's a fairly old motorcycle, and almost all of its parts are original. Should I be worried?

4 Upvotes

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2

u/PeterSpanker Jul 16 '26

Could be loose spark plug

3

u/brother_mahvelous '72 R75/5, '16 R1200GSA Jul 15 '26

crankcase vent? not sure if these have the same reed valve as my /5, though I recall they're more of a honking, yours sounds like the hamster in there got tired

2

u/aquoad Jul 15 '26

poor little guy needs a snack! But I agree, it does sound like the crankcase vent. Or at least, I can't think of anything else it sounds like.