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Check the valve lash. Sometimes, if the clearances get too tight, when the valves are hot the get long enough that they won't seat properly. I don't have the manual, but I'll bet .003 on the exhaust and .002 on the intakes are close. Put the motor at TDC and check them with a feeler gauge.
If they're not within tolerance, find the factory specs and proceedure for adjustment. This is an often overlooked part of routine maintenance. Good luck!
Inlet .0024 (two and a half thou.)
Exhaust .006" (six thou.)
(6) Set the valves:
Set the valves on the cylinder on the COMPRESSION stroke. Put the
wring
wrench on the locknut on top of the valve, and turn it anti-clockwise.
It will
be tight. Turn it about one quarter turn, and keep the wrench on it.
Then, using
the crescent wrench turn the square headed screw either in or out
depending
whether you need more or less clearance. We are talking about fractions
of a
turn here. Then lightly lock the locknut, holding the square headed
screw with
the crescent wrench so it doesn't move, and check the clearance. Repeat
until
it's exactly right. When it's exactly right, tighten the locknut.
Recheck.
(7) Rotate the engine one revolution exactly:
Shine the flashlight into either sparkplug hole and rotate the engine
slowly
so that the piston goes down once and comes back up. Stop when it's at
Top Dead
Centre.
(8) Now do the other cylinder:
Check the gap and set if necessary the other cylinder's valves
Repeat steps (5) and (6) for the other cylinder.
(9) Button it up:
Replace the valve adjustment covers, making sure to keep the gaskets
or
o-rings in place, the bike will have one or the other.
That's all there is to it!
The Honda Rider Club offers free membership which includes access to a generic service manual ... a paid membership gets you access to the service manual for your model according to info at the site. http://hrca.honda.com/
You should check the valve clearances, camshafts timing and make a compression test on the engine too. One or more of your inlet valves is/are either not closing entirely or they close but their stem is damage and it doesn't seal off the combustion chamber properly.
The valve clearances are the same as the GL 500,as I recall they are in .002" - .004", ex .003" - .006". The pilot air technically needs to be adjusted with the motor running. You want to start at 1 1/4 - 1 1/2 turns out.
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