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Mechanics 101 Can't get it to run right? Find a trick to add HP?
From the first oil change to completely rebuilding the engine,
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Old 12-31-2017, 10:00 PM   #1
Rikker
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Default Petcock

This might be a stupid question, and if it is I'm sorry up front. But do you really need a petcock? or can it just be bypassed? From what I can tell all it really does is turn off the gas when your not riding. Once again, sorry for the stupid question.
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Old 12-31-2017, 11:06 PM   #2
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Yes, you do need it. It is fairly common for the float needles to leak slightly. If your fuel flow is "on" all the time, you risk flooding your engine which can actually fill your cylinders with gas. Gas doesn't compress. This is called hydrolock, which can crack pistons and bend connecting rods when you crank your engine.

The stock Kat petcock is vacuum operated, which means it automatically stops fuel flow when the engine is not producing vacuum, which prevents overflowing your carbs if you happen to have float valves that don't seal completely, and prevents fuel from leaking all over the ground as well if you have float bowl gaskets that don't seal 100%.

Don't remove, the risk is too great IMO.
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Old 01-01-2018, 04:14 AM   #3
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I concur with Doc.
Leave the stock petcock in place. If it needs an overhaul, there are kits available. There's also an excellent how-to stickied in the forum as well. It mentions part numbers too.
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Old 01-01-2018, 04:08 PM   #4
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+1
I've rebuild several, the kit from K&L works great. Think they run ~$30. Krey's write up is excellent.
The rebuild process is pretty easy, only one thing you really have to watch out for is the little weird AF spring (krey's post has great pics of it and what you need to do)
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Old 01-02-2018, 08:48 AM   #5
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Couldn't agree more with everyone here, I'm sure we all hate that leaky lil poop head but a carb'd bike without it... All it would take is a single time forgetting to switch off that fuel line and you would be screwed.
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Old 01-03-2018, 08:33 PM   #6
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Quote:
Originally Posted by Suerte View Post
Couldn't agree more with everyone here, I'm sure we all hate that leaky lil poop head but a carb'd bike without it... All it would take is a single time forgetting to switch off that fuel line and you would be screwed.
I've had this happen when I left it on prime.
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Old 01-04-2018, 06:37 AM   #7
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Well that makes a lot of scene. Thanks for your help.
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Old 01-06-2018, 05:03 PM   #8
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Is the petcock also the fuel filter? When I got the bike it had 2 filters in line coming off the tank. This looked odd to me and I don't think its right.
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Old 01-07-2018, 01:36 PM   #9
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Negative, totally separate. What year do you have? I'm guessing 89-97. They don't get fuel filters. Filters on a pre messes up fuel flow
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Old 01-08-2018, 05:34 AM   #10
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I have a 97 600. an that's what i though. The manual didn't talk about a fuel filter so it looked like something aftermarket. Thanks for the confirmation. Ill pull them out today.
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