Hello to all, may I start with what a fantastic website thank you!! I have just got back my 92 mc21R I had sold to a friend a few years ago when I was in need of cash, he has seized the engine due to not putting one of the bolts for the oil pump back in when he was messing around with it and the oil pump has rattled loose and BANG. I have bought some second hand cylinders and heads but they are marked KV3L which I believe to be SP cylinders, the ones that came off the bike are KV3H R model. My question is will the SP cylinders and heads work with the R motor, does anything need to be changed to make them work. I have read not to mix them up, use L with L and H with H but is there any difference's with the bottom end except the clutch and gearbox, will they just bolt on and work?

Also I got carried away cleaning the power valves, they are shiny on the part where the exhaust gas flows over them. Now I started to worry that I shouldn't have and maybe it will rust?? any thoughts anyone

And now for the hard question, How to test the Air solenoids, when I got the bike 5 years ago I took it to the bike shop cause it ran like crap after 6000rpm. After a good carb clean and them fiddling around with the jets they told me the Air solenoids were not working, they disconnected the X piece and it ran pretty good and reved out all the way with no problems but started to loose power up top after a few weeks.
Do the air solenoids get power to them at a certain rev range or do they always have power to them that switches off at a certain rev range?? If so I can just check them with a multimeter when the bike is running right? also I don't have the original hoses for the air correction circuit does the diameter and length of the hoses matter if so could someone tell me the inside diameter of the hoses??

Thank you again NSW World, I have learned heaps from reading the forums Awesome site!!