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post #1 of 42 (permalink) Old 07-31-2011, 12:03 AM Thread Starter
1985 VN-700
 
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Clanking petcock

I changed the automatic camshaft chain tensioners over to manual today. The bike was quiet as a mouse. Then clankety clankety clankety. I thought crap a bad lifter. stethoscope screwdriver method. Nope, its the petcock. The noise gets faster as you rev the bike and decelerate. Geez its loud. Im guessing maybe the o-ring is gone inside the valve. If I pinch the vacuum hose it stops. I changed this hose. Is there a restrictor in there?
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post #2 of 42 (permalink) Old 07-31-2011, 12:41 AM
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Check the fuel tank mounting bolts.

02 honda sabre 1100
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post #3 of 42 (permalink) Old 07-31-2011, 11:14 AM Thread Starter
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No. Tank bolts are tight. I cant believe this little valve makes so much noise. It amplified through the tank like a speaker. Even my wife heard it. The weirdest stuff happens to my bike. LOL
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post #4 of 42 (permalink) Old 07-31-2011, 07:17 PM
If only it had 6th gear..
 
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No. Tank bolts are tight. I cant believe this little valve makes so much noise. It amplified through the tank like a speaker. Even my wife heard it. The weirdest stuff happens to my bike. LOL
Ha ha, that really is weird. I've been trying to figure our what is inside of it that could make that much noise and in the center of the diaphragm is there's a plunger that moves when the vacuum activates it. I suppose if it or the housing is worn it could be snapping when it moves? That's the only thing in there that I think could produce a noise. Let us know what you find. Good luck.
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post #5 of 42 (permalink) Old 07-31-2011, 11:25 PM Thread Starter
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Thanks. I should record the noise. Its unreal. Like I said a low fuel tank makes it sound like a megaphone amplification. Maybe I willl zip tie the vacuum line for now
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post #6 of 42 (permalink) Old 07-31-2011, 11:37 PM
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If you zip it you will not get any fuel.

02 honda sabre 1100
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post #7 of 42 (permalink) Old 08-01-2011, 12:01 AM
If only it had 6th gear..
 
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If you zip it you will not get any fuel.
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If you zip it you will not get any fuel.

True, but his is an 85 so he may be able to run it in the "PRI" selection if he has that type.
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post #8 of 42 (permalink) Old 08-03-2011, 06:42 AM Thread Starter
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I now know why its hard starting after a few days sitting. Fuel pump not working probably
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post #9 of 42 (permalink) Old 08-03-2011, 08:20 AM
If only it had 6th gear..
 
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I now know why its hard starting after a few days sitting. Fuel pump not working probably

Gravity fed. No pump man.
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post #10 of 42 (permalink) Old 08-04-2011, 06:50 AM Thread Starter
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Oh. I was thinking that the diapragm was sort of like a small engine pump. Ive never had one on any of my bikes. Oh. Its a shut off that opens on engine vacuum. Silly me. Prime position bypasses it I think. Still I wonder why it is pulsating?
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