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petcock only works on prime (Read 25 times)
rocky
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petcock only works on prime
11/15/07 at 17:57:22
If I put my petcock on prime my bike runs fine. If I put it on reserve or run it pumps fuel out the vacuum hose and the overflow. Is it bad diaphram?
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Reelthing
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Re: petcock only works on prime
Reply #1 -
11/15/07 at 19:08:12
overflows do not - the vaccum line sounds like it - and be really careful you can end up with a crankcase full off gasoline - not good - eats the bearings and cam in no time
search a bit - quite a lot of postings on the matter
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T Mack 1 - FSO
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Re: petcock only works on prime
Reply #2 -
11/15/07 at 19:17:27
Like Reelthing says, read the posts, but it really sounds like it's bad.
Fuel coming out the vacuum hose it a big clue.
Note: Check your oil. Probably should change it to be on the safe side.
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barry68v10
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Re: petcock only works on prime
Reply #3 -
11/16/07 at 03:15:41
Some here really like the vacuum actuated petc0ck, but when I started having problems with mine I converted it to manual operation and haven't had a single problem since. There's a post in here on how-to convert it...
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petc0ck mod, white spacer removed, 150 main jet, 12.5" shocks, 16" turnout muff, oil cooler mod, chain conversion, Tkat brace, external fuel filter, fuel screen removed...
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Re: petcock only works on prime
Reply #4 -
11/16/07 at 10:11:51
If the diaphram were bad, you would run way rich and stumbly even on prime, because gas would be sucking down the vac line.
Running good on prime says that your vac line is leaking air and won't pull enough vacuum to open the diaphram.
Replace the vac hose and you should be O.K.
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barry68v10
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Re: petcock only works on prime
Reply #5 -
11/16/07 at 14:20:42
Serowbot wrote
on 12/31/69 at 16:00:11:
If the diaphram were bad, you would run way rich and stumbly even on prime, because gas would be sucking down the vac line.
Running good on prime says that your vac line is leaking air and won't pull enough vacuum to open the diaphram.
Replace the vac hose and you should be O.K.
True dat! But the petc0ck conversion deletes those pesky vac lines...
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petc0ck mod, white spacer removed, 150 main jet, 12.5" shocks, 16" turnout muff, oil cooler mod, chain conversion, Tkat brace, external fuel filter, fuel screen removed...
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rocky
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Re: petcock only works on prime
Reply #6 -
11/16/07 at 16:29:25
I replaced the vacuum hose and gas is still running out the 2 tubes that are on the upper part rear of the carb. they run behind the little side panel. I don't have a problem converting petcock to manual but I would like to be doing the correct repair. As soon as I put the petcock on prime it runs great and there is no stumble and perfect idle and running. switched to either run or reserve gas comes out the 2 tubes. help!
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rocky
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Re: petcock only works on prime
Reply #7 -
11/16/07 at 19:23:59
I just realized the vent tubes are hanging down well below the carb could that be the problem?
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barry68v10
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Re: petcock only works on prime
Reply #8 -
11/16/07 at 20:13:32
rocky wrote
on 12/31/69 at 16:00:11:
I just realized the vent tubes are hanging down well below the carb could that be the problem?
No, I don't think so. My vent tubes hang below the carb, as do the one's on my dirtbike. It's kinda sounding like your float need is worn out, except for the whole bit about PRI petc0ck position seeming to cure all. So I'm gathering there's no gas leaking at all on the PRI position?
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petc0ck mod, white spacer removed, 150 main jet, 12.5" shocks, 16" turnout muff, oil cooler mod, chain conversion, Tkat brace, external fuel filter, fuel screen removed...
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rocky
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Re: petcock only works on prime
Reply #9 -
11/17/07 at 04:12:18
there is no gas leaking in the prime position, everything is good and runs fine
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rocky
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Re: petcock only works on prime
Reply #10 -
11/17/07 at 08:09:58
I raised the carb vent tubes up to the frame rail and after about 30 secs the vent tube starts to spew gas. As soon as I swith the petcock from run to prime it quits. Does anyone have any suggestions?
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Re: petcock only works on prime
Reply #11 -
11/17/07 at 09:17:21
Time to do the petc0ck conversion. Info on how is in the tech section.
I did it. It's not to hard.
Good luck,
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barry68v10
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Re: petcock only works on prime
Reply #12 -
11/17/07 at 12:15:39
Hmmm, so after all this, we're back to my original post.
Quote:
Some here really like the vacuum actuated petc0ck, but when I started having problems with mine I converted it to manual operation and haven't had a single problem since. There's a post in here on how-to convert it...
Also, I would consider removing the internal fuel screen and adding an inline fuel filter...that change added about 30 miles to a tank of gas for me.
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petc0ck mod, white spacer removed, 150 main jet, 12.5" shocks, 16" turnout muff, oil cooler mod, chain conversion, Tkat brace, external fuel filter, fuel screen removed...
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Trippah
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Re: petcock only works on prime
Reply #13 -
11/17/07 at 17:44:13
I don't think this is going as well as it could. If rocky wants to keep the vacumn system in place, then the real question is; why is the fuel leaking out the vent tubes when he is using the vacumn vs the gravity feed position. He has replaced the vacumn lines, it still leaks. Next check, I would think is to open the top half of the carb and see if the diaphram is okay, or if the needlejet whatever is hung up? Yes?
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Re: petcock only works on prime
Reply #14 -
11/17/07 at 18:05:14
First, (sorry) is the carb hosed correctly?
Vacuum to petcork, vents pointed up?
check with pictures in clymers, SSM or tech section.
If you're overflowing it has to be a needle valve problem.
If all else fails, remove carb and clean the he!! out of it. You got some demon in there.
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