I have a 2008 CBR600rr with about 56,000 miles on it. The last time the valves were checked was around 20,000 miles so I overdue to say the least to get the valves checked. A friend of mine has worked on motorcycles for a long time and offered to lend a hand. We took the motorcycle all apart like you have to till we got down to the valves. Even after 36,000 miles the valves are still +/- .001 within spec. I almost couldn't believe it! I even bought the whole shim kit online in anticipation of at least a few exhaust valves being out of spec but everything was as it should be.
I did want to point out a few "pro tips" for doing your own valve check which is more intimidating than what it really is. One issue we ran into was after we put the engine all back together the motorcycle started giving a two blink FI light. After a quick search I found out that it meant the MAP sensor was bad or the vacuum to the MAP sensor was incorrect. Unfortunately the MAP sensor is at the very bottom of the air box and you have to pull the entire air box out to get to it. Sure enough we somehow missed it and had snapped the little black tube piece off of the MAP sensor. We tried super gluing it back on but no go. It broke every time we tried putting it all back together. So when you put the airbox back together make sure to to pay attention to the bottom of the airbox where the MAP sensor has a hose and electric connector that needs to be reattached and carefully place the airbox back into the bike.
The other "pro tip" we found out was when you unscrew your secondary injectors and tape them to the underside of the gas tank or get them out of the way however you do it you may end out knocking the black rings on the bottom of them off quite a few times which we managed to do. We even knocked a sensor out once or twice. After putting the fuel injector back in I decided to just turn the key to on and see what happened when the fuel pump primed. Sure enough two of the fuel injectors that we had knocked out by accident sprayed fuel everywhere. After removing them we noticed the O rings were bad.
So in summary, be aware of the MAP sensor on the bottom of the airbox which is easily overlooked and you may want to get a few fuel injector O rings in the event you knock one or two loose like we did. They're not expensive, like 2 bucks on partzilla, and they are good to have on hand. Just a few things I encountered doing a valve check that would have been nice to know going into it. Hopefully this helps people who do their own valve checks in the future!
I did want to point out a few "pro tips" for doing your own valve check which is more intimidating than what it really is. One issue we ran into was after we put the engine all back together the motorcycle started giving a two blink FI light. After a quick search I found out that it meant the MAP sensor was bad or the vacuum to the MAP sensor was incorrect. Unfortunately the MAP sensor is at the very bottom of the air box and you have to pull the entire air box out to get to it. Sure enough we somehow missed it and had snapped the little black tube piece off of the MAP sensor. We tried super gluing it back on but no go. It broke every time we tried putting it all back together. So when you put the airbox back together make sure to to pay attention to the bottom of the airbox where the MAP sensor has a hose and electric connector that needs to be reattached and carefully place the airbox back into the bike.
The other "pro tip" we found out was when you unscrew your secondary injectors and tape them to the underside of the gas tank or get them out of the way however you do it you may end out knocking the black rings on the bottom of them off quite a few times which we managed to do. We even knocked a sensor out once or twice. After putting the fuel injector back in I decided to just turn the key to on and see what happened when the fuel pump primed. Sure enough two of the fuel injectors that we had knocked out by accident sprayed fuel everywhere. After removing them we noticed the O rings were bad.
So in summary, be aware of the MAP sensor on the bottom of the airbox which is easily overlooked and you may want to get a few fuel injector O rings in the event you knock one or two loose like we did. They're not expensive, like 2 bucks on partzilla, and they are good to have on hand. Just a few things I encountered doing a valve check that would have been nice to know going into it. Hopefully this helps people who do their own valve checks in the future!