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ViragoTechForum.com Tech Help Valve adjustment (SOLVED)

#1:  Valve adjustment (SOLVED) Author: jbsytes Post Posted: Sat Aug 14, 2010 2:41 am

Ok, so I tried to adjust the valves following the instructions givin' here, and in the manual. I must have goofed somewhere, cause now I only have 1 good cylinder and one barely working. After reading back thru the instructions, I think I had the timing out 180 degrees, not totally positive on that, but I think it is. I get alot of popping and backfiring from one pipe. and the rear cylinder gets hot. but the front does not. The front exhaust pipe is getting hot, but not the head. It just stays warm. So I will go back to square one, pulling everything off again, ( only what i'm supposed to) and re-adjust the valves on the compression stroke. But hey, at least the ticking noise is gone. LOL My other big bummer moment was when I did the compression test. Front cyl. 147lbs. Rear cyl. 90lbs at normal temp.

Post more after re-adjust.

#2:   Author: 1986 XV700 Post Posted: Sat Aug 14, 2010 11:10 am

The only marks that are important when adjusting the valves are the timing marks on the cam gears. Turn the engine , over, till the dot on the cam gear, lines up with the divot on the inside of the cylinder head, not to the left or right, but right on the mark. When these are lined up the valves in that head are closed and you can adjust those valves, then go to the other head and repeat. The position of the piston doesn't matter so there's no need to worry about the marks on the flywheel.

#3:   Author: grazingazer Post Posted: Sat Aug 14, 2010 12:50 pm

jbsytes wrote (View Post):
Ok, so I tried to adjust the valves following the instructions givin' here, and in the manual. I must have goofed somewhere, cause now I only have 1 good cylinder and one barely working. After reading back thru the instructions, I think I had the timing out 180 degrees, not totally positive on that, but I think it is. I get alot of popping and backfiring from one pipe. and the rear cylinder gets hot. but the front does not. The front exhaust pipe is getting hot, but not the head. It just stays warm. So I will go back to square one, pulling everything off again, ( only what i'm supposed to) and re-adjust the valves on the compression stroke. But hey, at least the ticking noise is gone. LOL My other big bummer moment was when I did the compression test. Front cyl. 147lbs. Rear cyl. 90lbs at normal temp.

Post more after re-adjust.
incorrect adjustment can result in a loss of compression due to a valve being bent when contacting the top of a piston

#4:  Re: Valve adjustment Author: jbsytes Post Posted: Sun Aug 15, 2010 9:23 pm

Ok, I re-adjusted the valves, and I think I got it right this time. Fires right up, (minus the normal starter issue) Idled very smooooothly, (after warming up) and boy oh boy, the power she has now is almost twice what she was before my first attempt. She still pop on deceleration, but I can live with that for now. I'm planning on having the engine gone thru during the winter so it will be ready for next seasons rides. Thanks for the tips, and for a great page to fix my ailments.
ViragoTechForum.com Tech Help Valve adjustment (SOLVED)


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