Question about 2005 kawasaki KX 250

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I have a 2005 kx 250 2 stroke and it keeps eating plugs

I have tryed diffent plugs br8 br9s and tryed diffent mixs with the fule and 2 stroke am goin to try cleanin tank and fule lines and then try a new plug but if ne one has ne idears plz message me thanxs dan

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  • Sharky Feb 07, 2012

    I don't know why anyone would be mixing 32:1. This is ONLY for pure mineral oils. If you're using a semi synthetic oil, you can safely mix at 40:1 & if you use a fully synthetic oil you can safely mix at 50:1. I have been doing this for 20yrs & haven't had a single problem with any of my bikes, jet skis, lawn mowers, chainsaws, etc etc etc. Use an iridium plug, at correct plug gap & follow the mixing suggestions I just mentioned & you will have the best performance from your machine.

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NGK brand spark plug BR8ECMVX is the stock plug for the bike. The proper gas / oil mix is 32 to 1. That means 4 ounces of 2 stroke oil per gallon of gas. The posting was not clear as to just what the problem is. If you are burning up plugs there may be a air leak in the intake system making the bike run lean. A lean fuel mix runs hot.

Posted on Jun 25, 2009

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Hey dan, I own a 2005 kx250 also , had a heck of a time jetting the bike to not foul plugs but here's what I did ,lower the pilot or low speed jet to a #48 (stock is #50 ) this will clean up the bottom end and make it a little snappier , If you're going to ride the bike wide open alot like in sand riding you could leave the stock #160 main jet in , If trail riding you'll want to drop to a #158 main jet this is all for sea level to approximately 1500 feet and 60 to 75 degrees, if you ride in 55 degrees and below you'll want to richen up the mixture to stock specs or more ,I'll use a #50 pilot and #162 main jet for 50 degrees and if it gets hot like 90 to 100 you'll probably want to raise your jet needle clip up one clip position (2nd from top is stock) to the notch on top of needle , all of these suggestions are what I use here in Oregon just make sure you're watching the plug color all the time especially when leaning the engine out it should be a light to medium dark brown in color, If it gets leaning towards a white color on the ceramic under the electrode you're in danger of seazing the engine, the last thing is run your premix 32 to 1 with a 50/50 race gas to pump premium ( if you can afford to) and that will help both keep plugs from fouling and prevent pinging of the engine , Also you need to use a old plug that has color on it when you're jetting , that will make it easier to see if your running lean. I'll bet this sounds like quite a hassle but once you get it sorted out you won't be eating $11.00 spark plugs anymore .I hope this helps , I haven't fouled a plug now for 2 years.

Posted on Jun 27, 2009

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Put a b7es pulg and run fuel mix 40 to 1 i thinks thats is 250 ml oil to 10 l feul and your air screw2.5 turns out

Posted on Mar 05, 2013

  • sean wood Mar 05, 2013

    check your reed vaules

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You don't always run 32:1. It depends on what king of oil running. If using racing oil most require 50:1. It says it on the back. 32:1 is to much oil and will foul plugs expecially if you do not run it hard. The plugs I always ran were br8es and br9es. Both ngk

Posted on May 24, 2012

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Hi, I have a 2005 kx250 with no spark plug problems 32:1 gas mix ( I use AMS Oil) and a Ngk-br9eix and you should be all set.

Posted on Aug 17, 2010

  • redgreenfan5 Aug 17, 2010

    Sorry that should be a NGK-BR8EIX

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4 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: my 1974 250 2 stroke will not start. I have a new

With a bike that is 35 years old lots of things could be the problem. I will list what to look for in a "most likely" sequence but with a mind to some of the easy things to check first.

  • Got gas and is it turned on? Clean air filter?
  • Have a buddy kick the starter while you look for spark.
  • Assuming no spark, How good is your battery? Fuses good? Kill switch on or shorted to the bars or elsewhere?
  • carb, head, intake manifold and carb mounted tight?
  • Does the carb intake manifold have reeds? What condition are they in?
  • I don't recall for sure, does the bike have CDI? If so, have the dealer test it and the coil.
  • If no CDI, when was the last time the points and condenser were replaced or points filed and set? Get the coil checked.
  • Remove the flywheel cover. Take hold of the flywheel and, without turning the wheel, lift the flywheel up and down then left and right. Any movement or was the flywheel rock solid? If movement then the crank bearings need replaced along with the crank seals.
  • Speaking of crank seals, how old are your seals? The bike ain't gonna run with bad seals.
This is a pretty good list of things that should keep you busy for a few hours. Wish I were there to help. It's been a long time since I serviced an old Yamaha 250. I was a shop mechanic for ten years.

Let me know what you find out.
Please rate this answer. Thanks Brandon!

Posted on Apr 02, 2009

ollie reece
  • 1167 Answers

SOURCE: hey! ,i have a 06 kx 250 2 stroke and shes not giveing any fire !

sounds like your coil is packing in try the coil on another bike buddy if this works on another nike get back to me

Posted on Sep 06, 2009

yz-maniac
  • 127 Answers

SOURCE: 2 stroke ratio

32:1 to 40:1 is fine.if you go any more than 40:1 your just wasting money and will foul plugs! any less than 32:1 and the top end is not protected.....

Posted on Jun 10, 2010

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1 Answer

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Everyone will tell you the oil they use is the best, so you are going to get a different answer from everyone that answers. I've been using BelRay MC1 for over 35 years and I have never had a lubrication related failure. I am still proudly racing 2-strokes at the top amatuer level. I have heard good stuff about Amsoil but I don't use their premix. I do use their suspension and brake fluids, though.

I suggest using BelRay MC1 at at least 32:1.

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differnt brands of oil, suggest different ratios. The oil packaging will give recommended mixes
starting at 25-1 for the cheaper mineral oils, to 50-1 for the more expensive synthetics.

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A “very helpful” rating for this answer? Thanks!

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