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1981 xv750 has spark but floods out

Cleaned the carbs floats seem right but it still floods out

Posted by Anonymous on


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  • Yamaha Master
  • 47,276 Answers

Hi, Anonymous and the usual suspects are:
1. Dirt or other foreign matter between float valve and its seat.
2. Float valve sticking.
3. Float valve and/or valve seat worn or damaged.
4. Float misadjusted.
5. Float cracked, leaky or damaged.
6. Excessive "PUMPING" of hand throttle grip.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Motorcycle Message Board Motorcycle USA
1981 1994 Yamaha XV Twin Service Manual Moto Data Project
OEM parts for Yamaha

Posted on Nov 21, 2016


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Posted on Jan 02, 2017

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SOURCE: flaot setting for 81 yamaha 650 maxim (4 ea.)

# 1carb left 0.04+or-0.04 inches mm 1.0+or-1.0 # 2 carb right 0.08+or-0.04 2.0+or-1.0 hope this gets you there

Posted on May 30, 2009

  • 311 Answers

SOURCE: yammy rd 200 1978 inconsistent running

check the neddle valve seats under the float bowls,may find that theseats are not sealing,to test,take the carbs off the bike,remove the bowls ,compress the floats untill they are all the way up(simulates full bowl of fuel)then blow through the fuel inlet pipe,you should not be able to hear air passing throgh the valve if you can replace the valve seat and the needle valve,sorry cant remember point settings,long time ago since i worked on one of these

Posted on Jul 04, 2009

  • 3600 Answers

SOURCE: Yamaha SR185 1981 carb settings

Righhttt And I need some new brain cells, stock jet size is .075 float level in 17/64ths turn adjustnebt screws in till they bottom out lightly then turn one and a half turns out andthat should get it to run, otherwise go to the nearest library and check out the book for that modle. there is another adjustment for the venturi plates but don't remember the exact proceedure.

Posted on Nov 22, 2009

Mr BrokRench
  • 1623 Answers

SOURCE: have 1989 fzr 1000 hard

Hello, these carbs can be hard to tune once they get out of tune. First thing you need to do is confirm you have spark. Pull the plugs and read them. If they are black and wet that would indicate no fire and/or rich fuel mixture causing them to foul. A white, grey, light brown color would indicate a lean mixture. Ideally you want a dark brown, but not black electrode for a correct fuel mixture. If the plugs are discolored, replace them. You can't properly tune the carbs other wise.
Next check for vacuum leaks, any unmetered air entering the engine will create a bad fuel mixture. Vacuum leaks around the carb boots is common on these older bikes. A good way to check for leaks is to use spray carb cleaner, with the engine @ idle spray around the carb boots, and all the vacuum lines. If the RPM's change, it has suxed some in and there is the leak. The needle, float and seat all need to be in perfect condition. The main and pilot jets, and all the passages need to be throughly clean. I use a small guitar string and carb cleaner, to clean with. If you have not rebuilt the carbs, i would install carb kits. Then sync and balance---carburetor synchronization is important for multi-carbed engines to run right.

Here are some video how to's that might be helpful.

Posted on Aug 30, 2011

  • 333 Answers

SOURCE: I cleaned the carbs it

Sounds like you need to check the needle and seat for dirt etc. or one of your floats may be sticking. A simple way to check is to connect the fuel pipe to carbs upside down with float bowl off and you will see if it is leaking or not. If that is ok then make sure that the floats are not sticking or holed. Test again by inverting the carbs again with no fuel in them and you should not be able to blow into the chamber until you turn the carbs to normal position. Hope that helps.

Posted on Sep 25, 2011

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