Question about Yamaha XT 125 R Motorcycles

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Gas is spitting out tne vent hole on an 32mm mikuni carb when it running at 1/4 or more throttle. elan 250 single cylinder skidoo

Posted by Anonymous on

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I think it could be youre float level needs to be adjusted if the float bowl gets too full it will come out of the vent hole

Posted on Apr 10, 2011

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Posted on Jan 02, 2017

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When I gas it up it vapor locks and spits gas out the vent holes I have it just barely in the spout and have to go real slow


Are you talking about filling the gas tank>> If yes,,, That is NOT vapor lock... thats just the angle, speed of delivery, size of hose in vehicle, etc that causes the gas to spit out,, try not putting it in so far, and use a different angle.. (mine does the same thing!)..

Vapor Lock is when the engine/carb get so hot that the fuel vaporizes in the fuel lines and carb...THEN "vapor" cannot be pumped into the engine... and it wont run... now ya know!! :)

Aug 11, 2017 | Cars & Trucks

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How do I adjust Mikuni carb, VM 28-242, to prevent fuel from coming out of air vent


Hi, Anonymous for more information about your issue and free downloads that you will need please visit the websites below. Good luck and have a nice day.http://www.mikuni.com/pdf/vmmanual.pdf Elan Mikuni Jetting Vintage Ski Doo
Mikuni VM Air Screw
http://kawtriple.com/mraxl/carb/carbadj.htm

Jan 09, 2016 | Motorcycles

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Bogging Bultaco


indicates problem floats or needle and seats
take the carbys to a specialist carby shop and have them full reconditioned

Jun 26, 2017 | Motorcycles

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Mikuni carb


Hey Anon,, WHY are you needing to replace the carb?? In my 40+ years of being a motorcycle/atv mechanic, I have only replaced 3 carbs,,,and CLEANED and repaired HUNDREDS AND HUNDREDS. reply to me on here.... I'll help you

Jun 28, 2017 | Suzuki 2005 QuadSport Z400

1 Answer

Idles, but no acceleration


Hi 1finehog, if you have a carburator the usual suspects are:
1. Damaged or restricted fuel tank venting system (gas cap).
2. Inlet system air leak.
3. Vacuum piston malfunction.
4. Accelerator pump leaking or no output.
5. Plugged bowl vent.
6. Fuel level (float chamber) too low.
7. Restriccted fuel supply passages.
8. Plugged jets or passages.
9. Worn or damaged needle or needle jet.
10. Enrichner valve not seated or leaking.
Good luck

Apr 24, 2010 | 2000 Harley Davidson FLSTF Fat boy

2 Answers

Rebuilt all four carbs cleaned and replace needle and seat.Bike runs on choke at idle but will not excelerate,dies when you turn the throttle. feather the throttle past 3000 rpm and it will respond but...


the ajustment need to be set where they were originaly, needle position and mixture screw. the carbs are not suppling enofe fuel, was there any torn seals or diaphrams.

Mar 15, 2010 | 1985 Yamaha FJ 1100

1 Answer

My elan floods out. Replaced all jets and still


The needle valve is stuck, you will have to get the carb. off and check the float and needle assy.

Feb 27, 2010 | 1989 Honda CBR 600 F(1)K

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Fuel line issues on Yamaha Timber Wolf ATV


That was an atmospheric vent you found that should not have gas in it. If it does, the carb has over flowed. It probably needs to be cleaned with special attention paid to the needle valve and float assemblies.It is routed up high to prevent water and debris from entering it and clogging it up. It should have holes for it to pass through on the snorkel coming out of the air box behind the gas tank under the seat.

Jun 28, 2009 | 2000 Yamaha YZF-R1

1 Answer

2003 rm 250 while holding gas at mid throttle it spudders


Install a new NGK spark plug ONE HEAT RANGE HOTTER THAN STOCK . Now go back to the 32/1 gas mix. The 32/1 is what lubricates the crank bearings and piston. At 44/1 you are asking for a seized piston and/or the need for new crank bearings. Be sure to use Two Stroke Engine Oil in the gas, NOT motor oil. Use premium gas, not regular. This should take care of plug fouling.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.

Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.


Please rate this solution as " FixYa " if all goes well. Thanks

Mar 28, 2009 | 2003 Suzuki RM 250

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