Still having trouble with my @T engine since the Refurb.

I'm sure one of my cam chains is rattling. There is a classic clatter from the front end on de-accelerating.
When I start the engine there 'appears' to be a slight misfire and there's some popping back from the exhaust. I know this can be caused by air getting into the system but everything seem to be tight on the joints.

I've replaced the plugs, coils (all 4) even the control units been replaced but all to no avail.

Its only done 40K (on the clock) but knowing now what I do about this bike, I'm not so sure that's accurate.

Anybody got a spare RD04 engine in good nick their prepared to sell? If I can get a good replacement, I'll whip this one out and strip her down and rebuild her slowly with whatever new is needed.

Mike