Topic: HELP!! exhaust valve opening in deg

[forwheeldrift]

can any one tell me what the stock exhaust valve opening is , at BTDC
for the 72' cb 500 four

i have the original Chilton's repair book but , it dose not have the answer it says N.A.

ITS GOT THE SIZES FOR THE 750 & 750K2 BUT NOTHING FOR THE 500.

[Bob Wessner]

From the 500/550 shop manual

[forwheeldrift]

thank you

[eurban]

Don't have the info your looking for but I guess you figured out that Bob gave you the valve clearance specs rather than the degree info?

[Bob Wessner]

Don't have the info your looking for but I guess you figured out that Bob gave you the valve clearance specs rather than the degree info?

So you think he was after setting cam timing? Oops.

[oldfart]

I do believe that information is still in the factory manual.  The manual gives opening and closing numbers and even the checking height.  I am on the road at present and not near my factory manual, but typically the early fours had almost all the same numbers.  Most of them were or were very close to 5-40, 40-5.  Some were 10-45, 45-10.  Like that.  I believe the 500/550 is 40-5, which means the exhaust opens at 40 degrees.  Remember however that this is using a checking height of 1mm (0.040"). 

http://www.motorcycleproject.com/motorcycle/text/lobectr.html

Edited because I had a brain fart and misread his question...   

[oldfart]

Then again, maybe he *was* looking for valve clearances...  Hmm.  In that case, friend, it's 0.002" for intake and 0.003" for exhaust.