My 90 had a floating valve and I'm stuck in a hotel for the next few months away from my famildy so I said hey, might as well rebuild the motor. Planning on replacing the keepers, springs and all other associated parts because I don't know the real reason why the keepers let go on that valve. I'm tossing up the idea of replacing all keepers at this point but haven't decided on it yet. I have a degree in automotive, not motorcycles but the concept is still the same, don't fix it if it ain't broke! The ticking I heard and thought was an exhaust leak from the pair port coverup I did was actually a floating valve! I got lucky, I'll post a photo in a little while of the worn carbon buildup on the piston from making repeated contact. I expected things would happen when I bought it with 75K miles on it. I'm going to be re-ringing it and honing cylinders, inspecting shift forks and probably replacing the main bearings depending on the condition and the measurements and how many thousandths of an inch of tolerance I have. I previously rebuilt a f2 motor but this will be my first time on a v4. My question is, to the people who have done rebuilds on this motor, what issues have you ran into and what should I expect and what parts would you consider mandatory other than the obvious o-rings and rings and gaskets/seals. I can also post photos of the teardown and rebuild, with the exception of the heads off because the engine wont fit in my trunk with them on!! hahaha!!! Thank you
Here’s the excessive carbon build up and the point where the valve was making contact with the piston.
No experience on overhauling v-fours fortunately, just beyond basic maintenance and riding. Keep us posted as I only think about these bikes on a daily basis of maybe 500 times a day My 82,000 mile bike does 150mph and rides/idles etc like a dream just saying. You might be better off just getting an Ebay engine too.