Looking for opinion or advice on valves. - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 11 (permalink) Old 09-10-2018, 08:46 AM Thread Starter
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Looking for opinion or advice on valves.

After riding 200 miles on my recent purchase of a 2003 classic, I noticed a lot of backfire. I did a shim check and the intake is within tolerance ( .1 ) but the exhaust is at 0. I checked the front cyl only as its running much colder than the rear. The bike has V&H exhaust without baffles. My concern is that since I don't know how long it has been running without baffles that the exhaust valves are burnt. Finding a good mechanic here (Dominican Republic) is like finding a needle in a haystack. On top of that you can't leave your bike in the shops here. Most work is done on the streets. This means if I want to see the valve seat I will have to pay to have it torn down then reassambled. From what I see I have 3 options. Reshim and pray the valves are good, buy new exhaust valves and pray the seats are good, or buy used Cyl head assy.
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post #2 of 11 (permalink) Old 09-10-2018, 10:48 AM Thread Starter
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Any input or advice would be greatly appreciated, thanks
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post #3 of 11 (permalink) Old 09-10-2018, 12:07 PM
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loco aqui la gente casi ni responde a nada, creeme ando en las misma manin.
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post #4 of 11 (permalink) Old 09-10-2018, 09:19 PM
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How many KMs are on the engine? At the very least you should correct the valve shim tolerance before you ride it any more.

Never argue with a fool: onlookers may not be able to tell the difference.
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post #5 of 11 (permalink) Old 09-11-2018, 06:10 AM Thread Starter
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There is 22,000 miles (35405 km) on the bike, I have parked it until I do some kind of fix.
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post #6 of 11 (permalink) Old 09-11-2018, 09:51 AM
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ALL valves should be adjusted to Kawasaki specified clearances.
Once that is done, you can do a compression check to verify seats.

Are you having intake or exhaust backfire?
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post #7 of 11 (permalink) Old 09-11-2018, 08:11 PM Thread Starter
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I believe it was intake backfire. The air breather would "pop" against my leg. I have ordered a shim kit and it should be here in another week. Glad I know someone with a compression tester. Wish I had my tools from Canada, lol. Checked the rear valve clearances today and they are below tolerance as well, but not "0".
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post #8 of 11 (permalink) Old 09-12-2018, 10:02 AM
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Quote:
Originally Posted by Marlburoman View Post
but not "0".
What do you mean by this?
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post #9 of 11 (permalink) Old 09-12-2018, 01:26 PM Thread Starter
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I didn't get the exact clearance on the rear cyl shims but there was an under tolerance clearance. There was no clearance on the front cyl exhaust valves. What I meant was that there was a clearance on the rear valves. It was not a "zero" clearance (like the front cyl) and the lifters were touching the shims. Sorry for the confusion.
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post #10 of 11 (permalink) Old 10-04-2018, 12:01 AM
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Just adjust your shims so you have the proper gap tolerance per the manual and I expect the bike will be fine since it is still running, but you need to do that otherwise you will fry your valves.
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