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Old 07-31-2011, 06:11 PM   #11
seruzawa
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More likely the vacuum hose is leaking or fell off.
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Old 07-31-2011, 06:14 PM   #12
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Quote:
Originally Posted by subievf52 View Post
I just ran the bike on PRI and it runs like a dream again.
At this point, you need a basic understanding about how the vacume operated petc o c k works. There is a little vacume operated valve inside that cuts the fuel off when the engine is not running. It functions like that if the lever is in the ON position or REServe.
In the PRIme position, it is just like REServe except that it bypasses the little automatic shutoff valve.

Read that again.

So, this means a couple of things:

1) You can run the bike with no problem set to PRIme but you will have no reserve and there is a tiny chance that fuel will leak out while it is parked.

2) The smaller hose connected to the petc o c k is a vacume line to the carbs. Be sure it is connected at both ends and has no leaks. Take it off at the petc o c k end and with the bike running, see if there is a vacume there. If there are no leaks and you have vacume in that hose.......then you have a defective petc o c k.

If you do NOT have a vacume in that hose, then the vacume port at the carb end is plugged up.

Those things are ALL it can be. Can't be filter or hoses or anything else. Your last test proved the problem is related to the petc o c k.
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Old 07-31-2011, 07:03 PM   #13
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I'm no mechanic, but don't stop here leave it on prime & ride like it's fixed. You'll get across town & it'll die in flood.
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Old 08-01-2011, 12:23 AM   #14
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That explanation makes sense. Greatly appreciated. I'm still not riding the bike, I had to ride around for a few miles just to be sure that it was functioning fine on PRI but that's about it. The bike is still at my folks place which is half an hour from where I live. Will see if I can make it over sometime this week to mess with it some more.

So, another question, say I pull the vacuum line off while it's running and there is vacuum. Would I need to replace the pet**** entirely? Or can I take it apart and try to see what's causing trouble. If I can take it apart and look for problems, is there anything in particular that I should be looking for? Sounds like I should be looking for that vacuum valve and see if it can actually open properly?
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Old 08-01-2011, 05:22 AM   #15
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You'll get across town & it'll die in flood.
No actually it probably WON'T.

Many bikes don't have that automatic shutoff feature and they work just fine. The primary responsibility for shutting off the fuel rests with the floats in the carbs.

If they are defective, it will flood out or leak when running because the vacume operated shutoff is open when going down the road.......just like manually setting it on PRIme.
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Old 08-01-2011, 05:26 AM   #16
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Would I need to replace the pet**** entirely? Or can I take it apart and try to see what's causing trouble.
That depends partly on how resourceful you ARE.
Most are not made to be repairable and are rivited together.
Look up your specific model in a parts catalog like BikeBandit and see if it is all one part or not.
Most failures are caused by a hole in the rubber diaphram.
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Old 08-01-2011, 11:02 AM   #17
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[quote=A Star Ride;263952]I'm no mechanicQUOTE]

I have seen in the past situations where the bike seemed to run (idle) great on prime, but no other position, but then die off at full(er) throttle positions. You know more about this then I do, I didn't want f52 to leave "well enough" alone & get stranded.
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Old 08-01-2011, 02:13 PM   #18
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I have seen in the past situations where the bike seemed to run (idle) great on prime, but no other position, but then die off at full(er) throttle positions.
That would mean that there is more than one problem.......and it is usually best to assume JUST ONE, at least in the beginning.
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Old 08-03-2011, 12:53 PM   #19
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I believe suzuki recommends no synthetic oil.
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Old 08-03-2011, 12:56 PM   #20
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Good luck!
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