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Old Apr 20th, 2012, 7:18 am   #1 (permalink)
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Valve clearance check - how often do they need actual shimming?

Just out of curiosity, factory calls for valve clearance check every 7500mi. I was wondering how often they actually do require to be shimmed on average.
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Old Apr 20th, 2012, 7:31 am   #2 (permalink)
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I asked the same thing to a very experienced tech.
He said that generally, on the testastretta heads, if the clearances were set up correctly at the factory, then they are most times still within spec at 7,500 miles (unless it's a track bike or really beaten on).

That being said, my clearances on the horizontal head were all within spec.
The vertical cylinder was all over the place.
I ride with spirit at times, but I don't beat my bike, nor have I tracked this one yet.
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Old Apr 20th, 2012, 7:33 am   #3 (permalink)
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Do you recall if the price of the service was the same for shimming the vertical valves?
Looking at the service manual the job appears to be significantly more involved if shims need to be added.
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Old Apr 20th, 2012, 7:53 am   #4 (permalink)
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Quote:
Originally Posted by samw5 View Post
Do you recall if the price of the service was the same for shimming the vertical valves?
Looking at the service manual the job appears to be significantly more involved if shims need to be added.
I don't know. I did it myself.
I guess it would cost more because of the added shop time.
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Old Apr 20th, 2012, 7:55 am   #5 (permalink)
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I don't know. I did it myself.
I guess it would cost more because of the added shop time.
The heads need to come off to shim them right?
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Old Apr 20th, 2012, 8:56 am   #6 (permalink)
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Quote:
Originally Posted by samw5 View Post
The heads need to come off to shim them right?
No. Just the valve covers, cam journals and cams.
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Old Apr 20th, 2012, 9:14 am   #7 (permalink)
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No. Just the valve covers, cam journals and cams.
Ah. I guess that gets me a little more confident I can do it. I guess I'll have to see how much free time I get this winter season
Thanks for the tip.
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Old Apr 20th, 2012, 9:04 pm   #8 (permalink)
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Ah. I guess that gets me a little more confident I can do it. I guess I'll have to see how much free time I get this winter season
Thanks for the tip.
Definitely a job you won't want to rush through.
Being my first time with a Desmo head,
It took me several days to do it with any amount of confidence in my work.
Even so, I decided to button everything back up and run it for another 1,000 miles, and I will recheck it all again. Just want to see how the half-rings/collets settle in etc.
I will do a write-up with pics of the process when I am satisfied with my work.
Probably won't be for a few months though.
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Old Apr 21st, 2012, 12:07 pm   #9 (permalink)
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Ya definitely gonna take my time if I decide to do it. I'll have all winter so I'm not too worried.
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Old Apr 28th, 2012, 9:03 am   #10 (permalink)
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Did you guys also do the valve lift check when checking for valve clearance? Seems to be in the same section in the user manual so I'm not sure if that's part of the regular 7500 check.
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