Question about 1993 Yamaha XJ 600 Diversion S

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1993 Yamaha XJ600 (pre divi) Mikuni carbs surging

Yamaha XJ600 (pre divi) has Mikuni carbs and K&N filters, and there is fuel flowing from no 3 carb. revs and power are very hit and miss, and at one point it started to accelerate revs by itself.

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Hi, Bevstait and the usual suspects are:
1. Extremely lean fuel mixture.
2. Dirt, rust, water, or ethanol sludge in the fuel system.
3. Sticky throttle cables.
4. Multiple carburetors not in synchronization.
5. TPS sensor out of adjustment or faulty.
6. Wrong spark plugs for the type of service.
7. Throttle bodies not in synchronization (FI)
8. Faulty O2 sensor.
9. Clogged, stuck, or faulty IAC valve.
10. Aftermarket components not compatible with ECM.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
New Seca II surging bogging under mid RPM load NOT CARBS XJRider com
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Posted on May 29, 2017


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Posted on Jan 02, 2017

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SOURCE: rebuilt carbs-starts and idles but wont rev up without choke on

sounds like the main jets are partly pluged, you must remve all brass jets and seats including needle jet and its slide soak in carb cleaner and blow out with compressed air only.. hold up to bright light to verify if all are clean. jim

Posted on Mar 29, 2009

  • 3567 Answers

SOURCE: yamaha yz 125 1994



Can I get a “very helpful” rating on this answer? Thanks!

Posted on Jul 06, 2009

  • 16 Answers

SOURCE: Carb (Mikuni) flooding on Yamaha Vmax motor cycle

I had a similar problem. For the float needle there is a seat that it goes into, check this for dirt first, then if no dirt present, the brass part (not the needle but the part it seats into) has an o-ring where it mates to the carb body. If that o-ring is not tightly sealed it will allow fuel to bypass. I found o-rings very cheap at pep boys just take an old one with you to match for size. very cheap too. (under 5 dollars)

Posted on Sep 20, 2009

  • 491 Answers

SOURCE: I have a yamaha trimoto 175 3 wheeler, The carb. Flooding!!


Posted on Nov 08, 2009

  • 666 Answers

SOURCE: How to clean (after a lay-up) the Mikuni BDS28

if you have idea for the removing carbs set, remove it from the block and dismantle all small parts, you can clean using gas, paint brass and pressurized air. for blowing small hole. be sure all kit to return back with no left behind.

Posted on Apr 13, 2010

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1 Answer

Mikuni carburetor overflow

Hi, Wes 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.
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Carb issue on Yamaha big bear 400 high end hesitation what could be a cause

Sounds like you are running lean at the top end. Unless you are a moto-psychic, proper tuning gear is important to prevent holing a piston or overheating. But a few things can be tried before dropping by your local Yama shop:

1. New parts may combine with a less than spotless work area to cause problems. Start with clean hands and work space!! If you are running the engine for more than a 30-60 seconds at a time, get out a good fan and keep things cool. It\'s cheap insurance. Now, since you posted in November and are likely north of the equator, I\'m assuming you have fresh, winter blend gas in the tank....

2. See if the engine revs differently with petcock set for run or reserve. If so, it\'s the petcock or tank filter that need attention.

3. Check the tank vent tube for blockage and sufficient flow. A vacuum will occur in the tank if it\'s wrong and counter fuel flow.

4. Check that spark timing or quality haven\'t been accidentally whacked. That will affect top end. Check all connections and wires.

5. Drop the float bowl and see if fuel flows well (note you may need to apply vacuum to the "automatic" fuel cock, if you have one, to get fuel to flow). Check fuel tank filter, fuel petcock, fuel line and carb needle and seat for blockages. You can use a paper coffee filter under the fuel drop area to see specifically if anything is there (and catch loose parts).

6. That done, get the carb manual or PDF to know what you are getting into. Carefully clean the fuel passages in the carb body. Maybe there\'s a bit of manufacturing grit or casting flash in the system. Carb spray may not do it. I\'ve found steel guitar strings and welding tip cleaner rods are the trick here. These are small holes. Be careful and don\'t force anything!!!

7. Lastly, that new carb may mean you need to increase carb jet size or adjust the metering needle to get enough fuel at high revs. This is especially important if you are above 5000 feet and the carb is jetted for less. The shop is best for this BUT, if you must DIY, get the carb manual or PDF to know what you are getting into. Jets: go rich one size at a time. Metering rod: move up/down one place at a time.

Hope that gets you down the road!!


1 Answer

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Hi, Anonymous sorry you can't find the first and best tool you ever bought for your Yamaha despair, not for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
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Fuel wont get to carb on yamaha diversion

Hi, Anonymous always check fuel flow first to isolate the problem area otherwise the usual suspects are:
1. Fuel tank empty.
2. Fuel cap or fuel tank not venting properly.
3. Fuel filter clogged with rust or dirt.
4. Fuel valve/petcock not in the on or reserve position.
5. Vacuum line to fuel valve cracked, broken, pinched, or missing*
6. Fuel valve/petcock clogged or diaphragm cracked, cut or torn*
7. Fuel line from the fuel valve to the carburetor or fuel pump clogged, cracked, pinched, bent, broken, or missing.
8. Fuel pump not working*
9. Fuel line touching cylinder or head causing fuel to boil and vapor lock, repair by rerouting and wrapping line with convoluted tubing.
10. Carburetor inlet clogged.
11. Carburetor float or needle and seat stuck.
12. Carburetor not venting properly overflow line or bowl fitting clogged, pinched, or bent.
* If equipped or applicable.
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Mikuni ucal carburetor diagrams

Many things can cause this;
check the following.

1. trash(including rust in the tank if metal) in the tank/carb. If the carb set for more than 6 months it may need the fuel system cleaned out(includes the carb). Putting a filter in the system will not take care of the rust problem in most cases. If the tank is metal and has rust it will need a tank liner kit like the brand "kreem" or the equivalent.
2. the needle/seat combination and/or float is incorrectly set or bad causing that fuel level to get high in the bowl. Check the float height according to the manual or replace the float/needle/seat.
3. bad seat o ring if it has one and also a petcock that does not shut off. If you can jog the seat around in the carb, then the o ring is probably bad. If you disconnect the fuel line from the carb and gas still comes out, the petcock is most likely bad or it has trash in it.

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I have a 2002 Yamaha Zuma II, it has a new battery, Plug and gas. It has great compression but will not start unless you spray into the carborator? I bought a new carb and checked all the jets, still the...

Hi and welcome to FixYa,

Based on your description, bike will start if you spray fuel into the carb, then the carb is not getting fuel. A couple of ideas you may want to explore/check/clean:
  • fuel valve;
  • some fuel valve have 3 positions, OFF, ON, PRI where the ON would only allow fuel to flow if there is sufficient vacuum from the intake manifold; the PRI allows fuel to flow unrestricted;
  • float settings of the carb;
  • fuel filter. Some tanks have built-in strainer/filter right before or part of the fuel valve.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

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