Carbs and flooding issues - Suzuki ATV Forum
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post #1 of 16 Old 10-07-2014, 06:04 PM Thread Starter
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Exclamation Carbs and flooding issues

There are basically two types of common carburetors used on ATVs. CV and standard. Both have slides.

CV = Constant Velocity. The throttle cable controls a butterfly valve on the engine side of the carb. The slide is operated by vacuum and uses a rubber diaphragm and spring combination to regulate how fast and how far it moves. The slide also has the Jet Needle.

Standard, often called Round Slide, but not all have round slides, the throttle cable directly controls the slide. The Jet Needle is also attached to the slide.

When 4 strokes flood, it can be very difficult to un-flood and even more difficult when using a CV carb.

The choke on all of these carbs is actually an enricher. It opens up another hole down into the float bowl that pulls more fuel into the engine.

Flooding is fairly common with ATVs, specially newly rebuilt or carb-cleaned ones.

If the ATV does not fire, pull the spark plug and look at it. If it is noticeably wet, you're flooded.

In CV type carbs, the float level is critical because of two factors. Set to high and the pilot circuit will get to much fuel and possibly the main jet will bubble more fuel up at idle. To low and the main jet will starve for fuel at higher speeds. There is a reason the tolerance is 1mm in all of these carbs.

Float level in non-CV carbs is also critical, but the tolerance is usually 1.5 to 2.5mm. Error on the side of to high and you typically won't have any issues.


Why is flooding so common in new rebuilds? When the engine doesn't start in the first couple pulls, the first thing people try is full choke, which floods it.

2013 Suzuki King Quad 500 AXi w/EPS
1990 Suzuki LT-4WD 250
and lots of snowmachines

Last edited by TUBBYTUBB; 05-28-2016 at 10:53 PM.
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post #2 of 16 Old 10-08-2014, 10:49 AM
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GREAT...great...write-up TheBearAK!!

Hopefully this helps those that have a flooded carb issue.


biz

==============================
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post #3 of 16 Old 10-08-2014, 11:38 AM
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Agreed. Think this thread belongs as a sticky.

2000 Suzuki King Quad 300 4x4
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2300 lbs Superwinch
Kenda Bear Claws (Rear 25X10-12) - (Front 24X9-11)
Differential Lock Mod
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post #4 of 16 Old 12-19-2014, 10:50 AM
Tim
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Excellent and thanks Bear. How many beers would you like to rebuild my CV carb?

Former: 09 LTA 450 AXI KQ, 93LT-F4WDX KQ, 93LT-F4WDX KQ, 94LT-F4WDX KQ, 95LT-F4WDX KQ, 87 LT230 QR, 89 LT80 QS
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post #5 of 16 Old 12-19-2014, 09:55 PM Thread Starter
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hehe, well, I'm not an expert on them. I just ripped into it and figured all this stuff out. The fine art of actually tuning a carb still eludes me.

2013 Suzuki King Quad 500 AXi w/EPS
1990 Suzuki LT-4WD 250
and lots of snowmachines
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post #6 of 16 Old 12-20-2014, 12:11 AM
Tim
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When electronic fuel injection first came out I thought it was BS idea. Then I got something FI...not looking back.

Former: 09 LTA 450 AXI KQ, 93LT-F4WDX KQ, 93LT-F4WDX KQ, 94LT-F4WDX KQ, 95LT-F4WDX KQ, 87 LT230 QR, 89 LT80 QS
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post #7 of 16 Old 07-26-2015, 08:43 AM
bkr
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having a problem with my LT-F4WD running fine till it gets worm then idles to fast
can some one help
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post #8 of 16 Old 10-13-2015, 06:14 PM
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Having problems with my Suzuki quad runner 250. Cleaned the carb because it would start and cut off when I gave it gas. After reinstall it runs worse. It takes awhile too start and once it does I give it full throttle and it hardly stays running and spits and sputters plus exhaust smoke. Not sure if I have the lines hooked up correctly. Any help would be appreciated.
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post #9 of 16 Old 10-13-2015, 06:16 PM
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Are you turning down the choke once warmed up?
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post #10 of 16 Old 11-08-2015, 10:15 AM
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Rebuilt Mikuni VM 26SS - Idle Screw doesn't affect idle.

Hello,

Just rebuilt Mikuni VM 26SS - (1987 LT230e Quadrunner) When running now somehow the Idle Adjustment Screw doesn't affect the idle. I just got the quad running again this morning and it starts/runs great until I let off the throttle. I'm turning the screw and nothing is happening to the idle speed. Does anyone have experience with this? What component did I eff-up on the carb rebuild? Thanks.

-C
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