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Valve adjust specs after 25,000+ miles on the 82
Posted: Fri May 08, 2009 9:19 pm
by Terry
Only four were out of spec, two, too tight and two, too loose (barely). Here are the numbers for anyone worried about the timeliness of adjusting them per the book.
.14/.10 .02/.09 .13/.08 .10/.11 .02/.09 .09/.08
.13/.14 .11/.10 .08/.09 .08/.09 .10/.09 .10/.13
Not bad for 92,000+ miles eh? But I'm still wondering if I should ride the 79 on tour this summer, seeing as how its the 30th anniversary and all...
Posted: Sat May 09, 2009 9:28 am
by EMS
Under "normal" circumstances the clearance gets tighter over time as the valve head and seat get cosy with each other. There is little I can think of that would make a valve clearance larger other than wear on shims
Posted: Sat May 09, 2009 2:20 pm
by alimey4u2
EMS wrote: There is little I can think of that would make a valve clearance larger other than wear on shims
Heavy carbonization on the valve seats but that is a thing of the past. Cam wear but that doesn't seem to be a problem with CBX's. Cam journal wear, doubtful ?? Most likely it's settled down (debris under the shim) from an earlier adjustment that was on the edge of tolerance....
Posted: Sat May 09, 2009 3:13 pm
by EMS
Cam wear - I was thinking about that. But wouldn't that be unlikely to affect valve clearance?? Cam wear usually occurs on the lobes, were there is metal-to-metal contact. The valve clearance, however, is measured on the ground of the camshaft where there is no contact and should be no wear...????
Posted: Sat May 09, 2009 3:34 pm
by alimey4u2
EMS wrote:Cam wear - I was thinking about that. But wouldn't that be unlikely to affect valve clearance?? Cam wear usually occurs on the lobes, were there is metal-to-metal contact. The valve clearance, however, is measured on the ground of the camshaft where there is no contact and should be no wear...????
You are indeed right Mike, thank you for the correction....
Posted: Sat May 09, 2009 5:15 pm
by EMS
alimey4u2 wrote:EMS wrote: You are indeed right Mike, thank you for the correction....
It was not intended to be one, Larry. I wasn't sure myself
Cam wear would sure cause a noise indicating a large valve clearance...
Posted: Sat May 09, 2009 5:59 pm
by alimey4u2
EMS wrote:It was not intended to be one, Larry
I know that Mike, it's good that we can openly question each others thoughts, makes for a better forum....
Posted: Sat May 09, 2009 9:54 pm
by Terry
Posted: Sat May 09, 2009 11:51 pm
by cbxtacy
Don't look at me, Terry. I do mine every 60,000 miles or 10 years, whichever comes first, whether they need them or not.
