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General Category >> Rubber Side Down! >> Carb Flooding when slowing down?
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Message started by Suzukisavvy on 09/04/14 at 08:22:33

Title: Carb Flooding when slowing down?
Post by Suzukisavvy on 09/04/14 at 08:22:33

On my 1998 Suzuki Savage LS650 when ever i slow down or am going down a hill the carb floods and send gas out the overflow tubes. Why is that happening? How can i fix the issue?

Title: Re: Carb Flooding when slowing down?
Post by Serowbot on 09/04/14 at 08:33:42

Do this test...
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1251932429/1

Title: Re: Carb Flooding when slowing down?
Post by Steve H on 09/04/14 at 20:44:57

Wouldn't fuel coming out the overflow tubes be more indicative of a float valve problem than a petcock?

If it's coming out the overflows, the fuel is getting into the bowl before coming out.

Does fuel continue to come out the overflow if you put the petcock to prime with the engine stopped?

Title: Re: Carb Flooding when slowing down?
Post by Serowbot on 09/04/14 at 22:12:16

If fuel comes out of tank unrestricted,.. through the fuel line, or the vac line... it flows everywhere below the tank...
The first test, should always be the petcock...(because it is a known issue)...
Once that is ruled out... the next test is the float system...
It's also the easier thing to rule out... (if everyone would just do the proper and complete test)... which includes both setting to Prime, and blocking the vac line...
(So many people just turn to Prime without blocking the vac line)...

There is no definitive test for a float problem... it's trial and error...
Leaky floats,.. sticky mechanism, worn seat, hardened needle tip, grit...
Test the petcock first... it might save pulling precious hairs out... ;)...

Once the pet is ruled out, you might well well be right, Steve...
It's a 50/50 proposition...
It's just best to try the easiest test first...

Title: Re: Carb Flooding when slowing down?
Post by Steve H on 09/05/14 at 03:33:13

You've got a good point there, Serow. The pet test is so easily done, why not do it and rule it out.

Just removing the carb, in most cases, will take longer than the petcock test. Every time I've ever had fuel from an overflow, it's been float system related. I wasn't considering how easy or hard it was going to be to check it. Sometimes it was as simple as the carb was in a non-designed position. (about 90º from vertical (bike on its side)) This has been especially true with dirt bikes.

All in all with the vibration, heat, constantly varying positions, it's amazing our fuel systems work as well as they do.

What Serow said...try the petcock test first. It's quick, easily done, and if it's not your problem, you've ruled it out and can move on to something else.