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I have a 95 wr250 it fouls plugs on idle and just doesn't sound right till u hit power band it blowing alot of smoke I'm running the fuel at 35:1 it also fouls plugs when I'm working the bike in the low rev range

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  • Motorcycles Master
  • 1,190 Answers

Are you using good quality oil ? when i raced two strokes i used belray race oil and it ran really clean ! more money but no problems ! is the mix correct as it sounds also that it is choking on the amount ? what is the colour of the plug ? it should be dark brown and not too much black oil residue ! are the carb settings correct ? what compression do you have , 100psi or above is good but less than is bad for two strokes ! ??

Posted on Apr 14, 2014

  • Shane obrien Apr 14, 2014

    I can't set the carby right yet as it fouls plugs I'm running motal oil around 35:1 and the bike has only just had a rebuild

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Posted on Jan 02, 2017

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  • 7 Answers

SOURCE: 91 kx 250 blows smoke and drips alot of unburnt oil out the pipe

Does it have a stock pipe,carb,any modifications! If its stock,I would put a new ring and piston in it,it seems like your getting a lot of blowby,also make sure your air filter is clean. It would help if you used an iridium spark plug.

Posted on Jan 21, 2009

  • 3 Answers

SOURCE: were does the spark plug go on a yamha wr250

remove the fuel tak, the plug is under the rubber cap right on the top of the engine. it is quite deep down, you will need an extension on the plug spanner

Posted on Feb 11, 2009

SOURCE: 2003 WR250 F - eng. won't idle down and carb starts to overflow

Hi Jwelden,
Have you checked the float level in the float chamber?
I guess you may have to reset the float pin adjustment, its allowing more gas to pass through thn required and thus the overflow!
Not bad too, when you are working on the float assembly take the opportunity to blow out the fuel line from petcock to the carburator via the seat for the float pin,any foreign particals there would stop the float pin to seal up and thus overflow.
Fit in an inline fuel filter , this will help keep out the dirt or whatever.
Hope this helps.

Knight (Yamaha Seca XJ750A 1981)


Posted on Feb 13, 2009

  • 9 Answers

SOURCE: how to drain fuel from carb bowl?????

there should be a screw or a larg looking bolt on the bottom of the float bowl (carb) remove it and it will drain use a rag to catch it and drain your tank add fresh gas (if it dose'nt run right you may have to clean the carb)

Posted on Apr 04, 2009

jayhope
  • 20 Answers

SOURCE: fzr6 running lumpy

also check the plugs are they new ,do they have build up eg cardon/oily ? check the jets sizes are they rigth size ?

Posted on Oct 26, 2009

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1 Answer

Blowing black smoke


far too much fuel not getting completely burned upon iginition.
That leads on to look at:
-fouled fuel injectors, (clean them - run injector cleaner)
-lack of air to the intake (filter and clear out tubing),
-spark plugs are fouled, (replace them, ensure wires seated correctly on plug)
-ignition power is low or partial, (ignition system module not sending enough electricity to plugs)
-ignition wires are bad, (check/replace)
-ECM is failing or getting bad sensor readings. (shop diagnosis)
-cat convertors have been removed and sensors are at fault
Its a long list -- do the easy stuff yourself, leave hard stuff to a shop diagnosis.

Mar 28, 2015 | Cars & Trucks

1 Answer

1999 jeep grand cherokee.uses alot of gas idals bad.new fuel filter.blowing black smoke.hit the gas.and it will get away from you...need help...


Can be a bad O2 sensor. Check with a scanner which shows live data the 1-1 and 2-1 (upstream) sensors. Good sensors show a rapidly fluctuating voltage from 0.2 to 0.8 V. When the sensor has a steady voltage, then its most probably bad. There is no check engine light and no fault codes set?

Jul 18, 2013 | 2000 Jeep Grand Cherokee

1 Answer

When I try to start my 1994 WR250, 2 stroke, it takes a million kicks, or 3 or 4 good pushes down a steep hill, popping the clutch. When I do get it started, once it warms up it will idle, and start back...


Sounds like a combination of leaking fuel tap and old fuel.

When you park it overnight or longer, pull the fuel hose off the carb , and drain the carb bowl.
So when you next ride it, reconnnect the fuel line, turn on the fuel tap long enough to fill the carb, 10 secs,then turn it off to start the bike, turn it back on when the bike starts.
even if you replace the fuel tap this process can help.


I have a 91 wr still sitting under the house from younger times, and yes very good bike

Aug 13, 2011 | Yamaha WR 250 F Motorcycles

1 Answer

When car is in idle all is well but as soon as I go and hit the accelerator the power bogs down. As soon as I let up on the pedal the car runs at normal idle again.


1- could be spark plugs fouled.
2-Fuel injection system needs adjustment or repair.
3-Fuel filter clogged
4-incorrect ignition timing
5-Intake manifold air leak

This should get you started on the right trac....

May 26, 2011 | 1991 Chevrolet Corvette

1 Answer

I have a 95 rm 125 i keep fauling plugs i mix my gas 40 to 1 and use penns oil 2 stroke mix im using a br9 and a br8 plugs i guess i need a special one but its 35 a plug also my bike when the power band in...


If your fouling plugs, my guess is that your premix isnt quite right and possibly your piston rings are on their way out. BR8/9 should be running your bike fine, we use BR9's in our bikes and we have no proplems. As for your powerband issue, sounds like a jetting problem. Could possibly be a clogged jet. Id suggest stripping the carb and cleaning it out, blow through all the jets, with WD40 or similar so that you know they are free and clear. Put it back together and give it a try.

Mista B.

Apr 14, 2011 | Suzuki RM 125 Motorcycles

1 Answer

Bike lacks bottom end power and topend doesn't hit band properly and it bellows smoke but its like gear box oil smoke its not running rich it has a new set of piston and rings the carby is fine and at...


Who put the new crankcase seals in your bike? Sounds like your sucking oil out of your crankcase if it is blowing all that smoke.just fixed Cr125 doing same thing.

Dec 20, 2010 | 2003 kawasaki KX 125

4 Answers

I have a Aprilia rs 125 2008,done 4000ks. It blows too much smoke


maybe rings are you losing coolant check the spark plug if it comes out with oil or too wet this means your oil pump is pulling to much in get back to me budd

Sep 10, 2009 | 2000 Aprilia RS 125

1 Answer

91 kx 250 blows smoke and drips alot of unburnt oil out the pipe


Does it have a stock pipe,carb,any modifications! If its stock,I would put a new ring and piston in it,it seems like your getting a lot of blowby,also make sure your air filter is clean. It would help if you used an iridium spark plug.

Jan 21, 2009 | kawasaki KX 250 Motorcycles

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