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Gas leak from airbox vent (Read 390 times)
Grand Strand
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Re: Gas leak from airbox vent
Reply #15 - 10/14/11 at 17:09:45
 
Ok my two cents worth on two things. First be aware that there is an o-ring on the brass seat for the needle valve. When you pull the seat to clean it up be careful about inspection and reassembly. Someone on the site IDK who has mentioned that you can check the float by slipping a clear tube over the drain valve while it is open, holding it up above the top of the carb. Watch the fluid level to see exactly where the fuel level is. It should be level with the top of the bowl. Level with the gasket.
Cheers 
Smiley(Lots - o - Luck!) Smiley Smiley
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steve73
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Re: Gas leak from airbox vent
Reply #16 - 10/14/11 at 21:33:09
 
re:Fish - I went to the HEL website and they didn't have 2001 listed, just like you said. For some reason, a bunch of people and sites think Suzuki stopped making this bike from around 99-03. As we know, they sure as heck didn't!

Anyway, I emailed HEL and asked if the part for the '87 - '98 LS650 would work for a 2001, they replied saying they believed it would, so I ordered the HBF7408 and installed it yesterday. Installed fine, but, obviously, won't be able to test for real until I can get the bike running. Fit well, had the rubber parts for the frame clip things, screwed together right, was the right length, not leaking... all systems go.

They have lots of colors available, which is pretty cool. I expect the brakes to be MUCH better (new pads, new stainless line, new fluid).


UPDATE: fuel wasn't leaking last night. Left it in RES all night and wasn't leaking in the morning. Came home from work around 5pm and gas was leaking again. Before I turned off the petcock, I already had the airbox open and the air filter out. There was a slow waterfall of gas overflowing from the air intake down the front (inner) wall of the airbox and out of the airbox vent, onto the concrete floor.

I don't need to do the clear PVC tube level check... I think this pretty much tells me what I need to know. I have some clear PVC but it was actually too large to fit the carb drain line or I would have done this yesterday - this IS a good idea, just didn't have the stuff to do it.

Like I said earlier, the carb rebuild kit has been ordered.

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ratz
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Re: Gas leak from airbox vent
Reply #17 - 10/15/11 at 10:21:01
 
steve73 wrote on 10/14/11 at 07:04:23:
I agree that while the bike is off, the "OFF" position on the Raptor will (and does) keep this from happening. But what if it happens at a long stop light and the bike stalls and my wife is 30 miles away from home? "OFF" is a band-aid, not a cure.



Oh yeah,I know it's NOT a cure,like I said I agree you need to find the float valve problem. I know I wouldn't let my wife be in that position either!(I like sleeping INSIDE the house! Wink)
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steve73
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Re: Gas leak from airbox vent
Reply #18 - 10/23/11 at 20:47:00
 
**UPDATE**

Got the carb kit Friday afternoon, couldn't get to it until today.

Took the carb apart, and I'd love to throttle the guy that last took this thing apart because EVERY screw was way way overtorqued.  Angry  Not cool, man.

Anyway, took the carb apart and took out the float valve.

  • Float itself - put it in the freezer for an hour and submerged it in water for a minute and no bubbles. Shook it, no fluids in it before or after. Check!
  • Float valve - looked okay, had a tiny ridge where it had been seating all these years. I mean really barely noticeable.
  • Float valve body - this thing just about fell out it was so loose. DING DING! I think we have a winner for the cause of the overflowing. While the rubber pointy disc itself wasn't perfect, I think it was holding. The body, however, must have worn out the o-ring a long time ago. The old body came right out and the new one was tough to get back in.


Put the battery on the charger (just in case), drained the oil (just in case gas got in there - new oil is cheaper than a new engine), put everything back together, finally got the brake fluid drained and put back together (the HEL kit for the earlier years worked great on the '01), filled the oil, got the seat back on and took 'er out for a ride!

Popping quite a bit on decel, but that's pretty normal for this bike. I haven't done a couple of the mods for the popping on decel, but as long as she runs and doesn't leak gas, I'm good.

After a couple of days of no more oil leaks out of the airbox, I'm going to plug the airbox drain. Don't see a reason why I should let air bypass the air filter and the manual says it's plugged. I bet the previous owner knew about this issue and that's why he had the plug out.
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steve73
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Re: Gas leak from airbox vent
Reply #19 - 10/28/11 at 10:15:53
 
One last update - it's been 5 days since I finished doing everything to the bike. Still no more gas leaks - yeah!

Wife rode it to work and back (about 25 miles each way) and it was fine. She was also astonished at how much more power it had after the Dynojet kit and the fixed carb and the fuel/air mix adjusted properly.

Also, she was very happy with the brakes compared to before - much firmer after the new pads/stainless line/fluid change.

Only 3 things left to do - see what I can do to minimize the backfiring on decel, fix the oil plug leak (not sure if I can do this without taking the entire engine off the bike), and give her a paint job befitting the rider (it's black now; wife would like white with pink accents/highlights).

Thanks for the help, everyone. This forum is really great.
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paul k
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Re: Gas leak from airbox vent
Reply #20 - 05/13/21 at 18:44:03
 
Found the culprit, needle valve seat oring was leaking fuel around it. Replaced o-ring, no more fuel in the air box!

Item 21 in diagram
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