Topic: Whats that Knock!

[MILO]

Howdy,

I've got a kawasaki GT550 thats done god knows how many miles.
It runs good, blows no smoke. but does have a small oil leak. can hear a bit of valve chatter.

When it is at idle, or say around 1000-1500rpm, there is a knocking sound coming from the bottom end, but as soon as the revs pick up to above 2000rpm the sound goes away.

What do you reckon it could be?

[Duke McDukiedook]

Does the sound change when you pull in the clutch?
Have the carburetors been synchronized/ worked on lately?

[MILO]

sound doesn't change at all when the clutch is pulled in.

Sound's definitely coming from the front of the engine, not the gearbox.

I just bought it, its been used as a daily driver by the PO for the last year, i doubt its had the carbs balanced or worked on in the time he had owned it.

[MILO]

anyone?

[Duke McDukiedook]

Time for a full tuneup, then come with Q's.

[333]

That must be one of those models not imported into the U.S..  There was a Kaw GPZ550, and Suz made a GT500(2 stroke).  But, no matter.

If a tune up doesn't do the trick, you'll probably need to do a rebuild. Crank and rod bearings.  There is no easy fix if that is what's wrong.