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Severe carbon buildup on one valve? (Read 192 times)

Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18098 Camp Springs, Kentucky Gender:	Re: Severe carbon buildup on one valve? Reply #15 - 07/23/15 at 19:25:33 There is also the possibility that the valve seal on that side is a bit leaky, and is allowing oil to run down the valve stem and onto the bottom of the valve.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Severe carbon buildup on one valve? Reply #16 - 07/23/15 at 19:28:22 Correct, and the valve seat test will point the finger.
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Dave

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Re: Severe carbon buildup on one valve?
Reply #17 - 07/24/15 at 04:08:51

justin_o_guy2 wrote on 07/23/15 at 19:28:22:

Correct, and the valve seat test will point the finger.

We are not talking about the same "seal".

You are looking to check the seal of the valve seat and valve face with the liquid test. I am suggesting that maybe the valve stem oil seal is leaky on one of the valves.

I am not sure how you are going to do your liquid test....the valve is not level in the head, so I don't know how you are going to get the liquid to cover all of the valve from the carb spigot side. I would think that a "leak down" test using air would be far easier.....remove the spark plug and put air pressure in the cylinder through the spark plug hole, and see if any of the valves are leaking. If you hear air in the muffler the exhaust valves are not sealed, air in the intake and those valves are not sealing, air in the oil breather and the rings are leaking.

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Gary_in_NJ

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Re: Severe carbon buildup on one valve?
Reply #18 - 07/24/15 at 09:08:24

Dave wrote on 07/24/15 at 04:08:51:
justin_o_guy2 wrote on 07/23/15 at 19:28:22:
Correct, and the valve seat test will point the finger.

We are not talking about the same "seal".

You are looking to check the seal of the valve seat and valve face with the liquid test. I am suggesting that maybe the valve stem oil seal is leaky on one of the valves.

I am not sure how you are going to do your liquid test....the valve is not level in the head, so I don't know how you are going to get the liquid to cover all of the valve from the carb spigot side. I would think that a "leak down" test using air would be far easier.....remove the spark plug and put air pressure in the cylinder through the spark plug hole, and see if any of the valves are leaking. If you hear air in the muffler the exhaust valves are not sealed, air in the intake and those valves are not sealing, air in the oil breather and the rings are leaking.

In order to conduct a proper leak down test:

1) ensure that the piston is at TDC. Put the bike in gear and have someone sit on the bike to ensure the engine stays at TDC during the test.

2) Don't just fill the cylinder with air. Use a leak-down tester (HF has 'em) that has two indicators, one for reference pressure and one for cylinder pressure. I usually use 70 pounds as the reference pressure.

3) A 10% differential is considered acceptable between the reference pressure and the cylinder pressure.

4) Conduct the test on a warm engine.

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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Severe carbon buildup on one valve? Reply #19 - 07/24/15 at 17:10:01 Good Going Gary! Sounds like a Genuine mechanic talking. I admit, I'm good at just fixing stuff, but others sure can be better. I Like that answer. Thanks for stepping in.
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