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  #1  
Old 07-15-2005, 11:16 PM
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Default New to 2-strokes... need help

     

Ok.. I know it's been discussed already.. I did a search and read a little, but any info will be helpful.

Here's the story:
I haven't had a 2-stroke since 96. I haven't ridden in almost 2 years.
Just got a 98 kx250. The previous owner said the bike fouls the plug just about every ride. What should I check or change? (he used Motul? and mixed it 32:1)

General Maintenance ????
change the gear oil every 3 rides, clean air filter every ride, wash bike after every ride, top end once a year (or as needed)...

anything else?

Bike Setup?
I'm 6'2" 220lbs. I like to jump, even though I'm not very good at it. What's the best suspension setup?

Any other info will be appreciated... THANKS
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Old 07-15-2005, 11:18 PM
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Default Re: New to 2-strokes... need help

Well if it fouls plugs every ride you might want to look into getting it jetted....
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Old 07-15-2005, 11:24 PM
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Default Re: New to 2-strokes... need help

Did he say lately it started fouling plugs or has always been like that? Id look into just doing a top end right away, it could save you having to get it replated or sleeved and may make the jetting problem go away. Also look into the spark. If the spark isnt bright this can also cause fouling. You could try running one step hotter plug.

Also check jetting like alex said
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Old 07-15-2005, 11:31 PM
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Default Re: New to 2-strokes... need help

He said it's been doing it since he got it. He just put a new top end in it. Compression is 160 (so he says). he = previous owner

....and yes... I will go get a manual on Monday.
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Old 07-15-2005, 11:45 PM
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Default Re: New to 2-strokes... need help

I thought the compression check after a new top end should be around 190 - 200? At least thats what the yz was when we did it. Either way if its 160 that should be ok its probably more of a spark or jetting issue then. Well unless the guy lied, remember that DOES happen lol. I know from experience
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Old 07-15-2005, 11:49 PM
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Default Re: New to 2-strokes... need help

thanks for the info... I will try going with a hotter plug.. I'll post up tomorrow what's in the bike currently... and I'll try messing with the jetting after I get the manual.. isn't it just the needle inside the carb?

10 years and one too many beers to remember anything about 2-strokes
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Old 07-16-2005, 12:19 AM
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Default Re: New to 2-strokes... need help

Quote:
Originally Posted by kaaronc
10 years and one too many beers to remember anything about 2-strokes
LOL Don't feel bad, I'm kind of a 2 stroke newbie too.

First thing. Make SURE your float level is correct. It has alot to do with how lean or rich your bike is regardless of jetting. Click HERE for a GREAT how-to on how to set it. The spec for the measurment should be in your manual. Good luck and let us know how it goes from there.
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Old 07-16-2005, 02:00 AM
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Default Re: New to 2-strokes... need help

Do as was suggested by Kenny before you touch anything else. Without the float being set all the other jetting exericises just wont bandaid it up. Brass is expensive, and if you need it buy it, but make sure that baseline maintenance item is right. You can do it faster than you can do a compression test.
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Old 07-16-2005, 07:51 AM
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Default Re: New to 2-strokes... need help

When its time to start onthe jets, go here for a starting point. http://www.fmfracing.com/jetting_center.aspx
I have used their jet settings before on various bikes and they have always been pretty close.
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Old 07-16-2005, 04:39 PM
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Default Re: New to 2-strokes... need help

thanks for all of the info
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Old 07-19-2005, 11:04 AM
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Default Re: New to 2-strokes... need help

Personally, if you classify yourself as jetting illiterate, you should use the factory recommended oil and ratio. You can then follow the jetting tables that are often in the service manual. Once you get more experience, then you can look into running different pre-mix types and ratios.
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