Self profiling Cam lobes

[T.W.R]

Check this beast out

It hasn't taken thou's off the lobe it's taken millimetres, the edges are were it's supposed to be
with that amount of wear you'd think the rocker would be naffed but nah just slightly worn

This is out of a Kawasaki KVF650 Quad that has come into work because it was running rough
It's the cam out of the front cylinder and the rear wasn't any better but on the opposite lobe

[98tls]

Bloody hell,was it noisey?

[T.W.R]

Bloody hell,was it noisey?

Just a bit could have been part of the percussion section in an orchestra

[98tls]

Just a bit could have been part of the percussion section in an orchestra

Or maybe even a Ducati clutch

[paturoa]

oops forgot the hardening - oh well just bung it in, it'll be out of warranty b4 anyone notices..

[FROSTY:Me]

and it was still running ?

[Motu]

Looks like a mid '80's XR250 cam.

I've seen worse,on a diesel Isuzu - it wouldn't rev past 2500rpm.Also SR20 Nissans after the cam oil feeds block,symtom (apart from the noise) is a rough idle.

[deanohit]

Hahahahaha, man, how many kms/hours had that bike done?
Must've had a hard life!

[T.W.R]

Or maybe even a Ducati clutch

Nah an Old Duke dry clutch had nothing on this

oops forgot the hardening - oh well just bung it in, it'll be out of warranty b4 anyone notices..

Somehting like Honda V4s of the early 80s

and it was still running ?

Yep just though

Looks like a mid '80's XR250 cam.

I've seen worse,on a diesel Isuzu - it wouldn't rev past 2500rpm.Also SR20 Nissans after the cam oil feeds block,symtom (apart from the noise) is a rough idle.

It's a KVF650 Prairie, but the engines in them were a bit of failure (starting to gain a rep actually for dying prematurely) and have been updated to 700s & 750s.

[T.W.R]

Hahahahaha, man, how many kms/hours had that bike done?
Must've had a hard life!

there's about 8600kms on the clock but being a dairy farmers bike thats like going from here to Siberia & back

[F5 Dave]

GPZ305s used to do this all the time. Would get noisier & slower until round.

Interestingly I've just been reading an article on Z250s which they were based on in m/c mechanics. Seems half the issue is the oil pump gets rooted by debris from the flywheel & there is a filter behind the pump that never gets cleaned.

Great design. Still, the less quads holding up traffic on trail rides the better.

[Motu]

Premature valve train wear is nearly always a lubrication problem.....oil quality,or a supply issue.To counter that I have also seen cams wear from faulty materials....built up and reground for example.