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Hi thank for checking out my page i just bought a used kx125 and it runs great the only problem is the spark plugs fouled. Now i hhave heard a few couple answers to this but it could be that this is my first 2 stroke and i am used to a four stroke that im under reving it. this happened in trails and the bike is not a trail bike so that could be why but i dont think 2 spark plugs in 4 hours is because of that any help is greatly appreciated





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If the previous owner didn't rejet for the pipe and V-force, it is probably running rich.

-Have you adjusted the air screw yet?
 

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Tree Magnet
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don't change your premix ratio OR run a different plug range until you get the jetting issue fixed. Spanky's jetting guide is posted here in various locations, or you can google it. It's an easy yet comprehensive way to get your jetting straight.
 

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what year is that kx and like dmstarr said dont change your mix ratio as fromt he factory it should be 32:1 at least thats what my 03 calls for and thats what i run .......... ive just rejetted it for this elevation and weather and it runs great i havent chaged a plug in about 4 days of trail riding with about 5-6 hours day
 

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Discussion Starter #7
yeah mines an 03 kx125 i am not the best with the engine and that sort of knowledge should i take to a dealer or is this an easy operation?

thanks
 

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there is a thread on one of these web sites to a post called "sparky's jetting guide" do a google search for it and read it through a couple times before you go out and try it but its pretty simple to do if you read it understand it .... if not get a friend with some knowledge to help you out and as a last resort ( or a first if its easy to do ) go to a local track on a weekend when there is a open riding day and ask a local rider with some help ...... just dont let them tell you to lean out your fuel / oil mixture or run a hotter plug as both of these ideas are just band aid fixes to the real promblem and alot of times over a period of time will give you more headach than if you just learn how to jet from the get go

oh and the mixture should be a 32:1 for your oil / fuel mixture .... this is what the manual says it should be .....i recommend getting a mixing cup to get an accurate mix for your fule plus alot of time the mixing cups also show how much is in the cup in ounces and cc and can help you fill your crankcase and forks with the proper amount of oil
 
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