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Carburetor adjustment suzuki ls650

What is the float level for the carb on a 2000 Suzuki ls650. I am having problems with it backfiring to much. It doesn't seem to be getting the right amount of gas in the carb and I need to know the float level so I can eliminate that. I would also like an exploded view of this carb if you have one.

Posted by Anonymous on


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Posted on Jan 02, 2017


SOURCE: Cleaning carbs on Suzuki GS650 L, what is the float setting?

to check the float height, invert the carb body holding the float arm pin so the pin will not slip off. With the float arm kept free, measure the height it should be 22.4 + or - 1.0mm
This is what the shop manual says.
basically what that means turn the float bowl upside down and keep the bottom of the float even with the edge of the bowl.

Posted on May 18, 2009

  • 2 Answers

SOURCE: setting float level on HSC40 Hitachi carburetors on 1986 Virago

I have a 1982 Virago 750 that I just did a carb rebuild to. To set the float levels I built a jig from wood that simulates the position of the carbs when mounted on the bike. This jig clamps into my bench vise. I created a fuel supply using a small funnel and a piece of fuel hose mounted above the level of the carbs.. After that all you need is a short length of transparent fuel hose to attach to the drain on the bottom of the float bowl to provide the visual indication of the float setting. Now you are ready to set up the float levels on your bench. This is way easier than trying to set them up in the bike.

Make sure that the jig is set up so that the carbs sit as level as possible across the pair and that they sit as close to the natural position in the bike in the lengthwise position when the bike is sitting level.

The process of setting up these floats can be very tedious, be patient. It may require that the float bowls be removed multiple times to get it correct (I replaced the philips head machine screws with allen head screws to make this easier). Printed instructions for the procedure look for a certain fuel level setting plus or minus 1mm. This kind of tolerance can be quite difficult to get when the only adjustment you have to work with is to bend the metal tang on the float assembly.

Posted on Jul 09, 2009

  • 15 Answers

SOURCE: Float setting for BS34ss carb

I have a set my float to 22.0 +- 1.0 for a Mikuni carb.
To set floats, drain the carbs, pull the carbs from the bike invert and remove float bowl.
With the carb inverted, take off the float bowls. Take off the gasket. Use a vernier caliper or an accurate device to measure from the carb body to the top of the float block.
Here is are a couple of good sites about carbs and such.

Posted on Aug 18, 2009

  • 194 Answers

SOURCE: where do all the hoses go to a suzuki quadrunner carb

There is one supply hose (larger) and a bunch of vent tubes. The vent tubes really don't matter how they are connected as long as they vent. The vents that point vertical - just loop the tube up and then down towards the ground.

Posted on Oct 08, 2009

  • 17 Answers

SOURCE: My suzuki intruder is missing backfiring on the

Did you sync the two carbs? If not the rear may be getting all the gas from the rear carb and none to the front. Twist throttle engine off and see if front carb cable is pulling the carb open.
Also unscrew the spark plug boot from the front spark plug wire and trim 1/8th inch off the wire and screw the boot back in. The plug wire end may be corroded on that wire.

Posted on Feb 08, 2010

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I have a 2004 Suzuki LS650 that won't start. Battery says it's charged . Has new spark plug. Gas is good. When I go to start it it does not start, and then the battery is low again.

You say the gas is good? do you mean fresh in the tank? Try draining the card floatbowl using the 10 mm headed bolt on the very bottom of carb. If you smell a foul odor there is varnish buildup in the carb which will require a complete fuel system/ carb cleaning to fix.

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Hi, Jacob and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
8. Damaged petcock diaphragm allowing fuel to flow through the vacuum line into the combustion chamber.
9. Contaminated gas tank.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Savage LS650 dumping gas
Suzuki LS650 Carburetor Cleaning
Suzuki LS650 Savage Service Repair Maintenance
SUZUKI LS650P Owner Manual

Btw, I’m available to help over the phone in case u need at

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You need to drain all the oil which by now is contaminated with gas.
You will also need to clean the carbs and get the float pin examined and better to get the carbs throughly cleaned also resetting the float to the required level in the float chamber.

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The problem is probably you carb. float is sticking open,you need to check the float bowl to see if it has fluid inside the float,the float may have a crack in it ,if so you will need to replace with a new one. to get to the float you have to take the lower half of the carb apart,it should only take one screw to seperate it.

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the floats in the bottom of the carb need adjusting the are to low


When setting the float level be aware that the spring loaded bumper on the fuel inlet needle valve may have a tendency to compress under the weight of the float assembly which will skew your measurement. Before you obtain your measurement you'll need to make sure that the float assembly tang just barely makes contact with the spring-loaded bumper. Sometimes it is easier to hold the carb body at a 45-degree angle to avoid compressing the spring in the fuel inlet needle.


If you find that your measurement does not match your float level spec then you can carefully bend the float assembly tang to achieve your desired measurement. Be sure to recheck your work, and if you feel confident that your float level is spot on then you can reinstall your carb and get back to riding.

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I suspect the float in the carb had stuck down.
Strip the carb down and replace any corroded jets and fuel float valve.
Change all fluids, oil etc. as you need fresh lubrication to keep the engine going smoothly.

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When cleaning a multi carb bike, it is best to take them all off. Clean and reset float levels on both. Then reinstall, set both idle mixture screws about 1 turn out. Then adjust, and you'll probably have to syncronise them also.

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