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RC51 Valve Clearance Check

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14K views 10 replies 5 participants last post by  ajluhmann  
#1 ·
Just did the 16k valve clearance maintenance check on my 01 RC. Took 3 hours and cost $0. Although you need to have the service manual to explain the tolerances needed. I've been told its roughly $400 from the dealer. The hardest part is removing the gas tank. If you can get beyond that the rest is down hill. I took pics during the process. Shoot me a pm if you need any help. BTW....at 22k miles all of my intake and exhaust valves were still within tolerance.
 
#4 ·
now i know for a fact i was scammed!!! 2 years ago i bought my SP1 from the biggest Honda dealership in South Africa. with only 8 000 miles on the clocks. the bike looked brand new and spotless. so i reconed the miles on the clocks colaberate with the overall condition. soon there after i decided to do the valve clearance check. and all 8 shims were out of spec. but with a HUGE margin. i found it very strange. but either way, i replaced all 8 shims. so with all 8 shims out so far, i think someone screwed around with the speedo. what the saying; "nothing sells as easy as a low mileage vehicle" damn bastards! whats the easiest way to determine true mileage?
 
#5 ·
You haven't mentioned the facts that mean you were scammed.
How huge a margin are you talking on the shims? With shim heads it's normal practise to set them at maximum spec as they tighten up with use.
There is no way of knowing the true mileage on any vehicle, and it's irrelevant anyway. All that matters is that the bike is in good condition. Is there something about the bike that indicates high mileage?
 
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#6 ·
dieprofeet, did you check the valves yourself or had a dealership check them?
How sure are you that you did it right? Were they tight or loose?

Checking valve clearances is not that hard for anyone with basic tools and a quality filler gauge, adjusting them takes a little more expertise and much more work. Needless to say the work area should be as clean as if you were doing surgery.
When the seats wear the gap narrows, when the engine overheats, gets little oil in the head, or bad oil, or oil contaminated with metal grinds, the gaps can become wider from wear on the lobes and contact surface. Always turn the cams around and watch for discoloration, pitted surface, uneven wear. They should ideally have a single tone color and mirror shine.
 
#8 · (Edited)





Here are some color pictures of what you are looking at when you remove the valve cover. Keep in mind that you should have a honda service manual nearby, because you do need to rotate the crank shaft to align the camshafts. THe service manual does a good job of explaining that part. Also keep in mind that there is 1 head cover bolt that is different than the other 2. It is black, and longer, whereas the other 2 are silver. With the front valve cover, you need to losen the oil cooler from its mounts. Its a bit tricky and tight up front so be careful not to allow any road grime into the top of the valvetrain.
 
#10 ·
I made some corrections to a couple of the pictures and converted them to JPEG for those having problems viewing.

The +/- I believe should be 0.03mm not 0.003mm which I do not believe any of us have an instrument to measure. 1"=25.4mm 0.001"=0.0254mm

PS Damn, those throttle bodies look tiny ;)
 

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