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Discussion Starter #1
I got a 1996 300ex with a k&n w/ outerware and removed airbox lid and a hmf slip on with stock head pipe. Really no other performance mods but i got a 40 pilot with a 130 main in it does that sound correct? Cuz i tryed 2 do a spark plug check but its freezing cold here and almost 2 feet of snow on the ground. The new plug i put in came out still shiny and looked new still. Shouldnt it have come out like a brown color?
 

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Yeah, you really need to rapp it up into 5th gear then kill the motor. I don't know if just revving will do it. Your jets won't be the same from winter to summer. Cold air is more dense.
 

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Agree^^^^ you need to get it real hot about 20 min of good riding. then on the last run wind it out through the gears and shut it down in 5th like Red said, make sure you don't pull in the clutch either just let it die off.
 

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Discussion Starter #4
I got it goin down the road and froze. lol. but i got 2 5th gear with the tires spinning and it still dont look brown my brother said it sounds like im running way lean does my jetting sound ok 2 u tho?
 

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Im running a 134 main and a 42 slow jet with no box lid.. try putting your lid back on and see if you get a different reading. running it too lean is very bad for your engine, you run the risk if melting a piston.
 

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Agred^^^^^^^
 

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Discussion Starter #7
Yea i think my jets are wrong if ur running just a little higher then me and u got all that stuff done to ur motor and a full head pipe. Ive got limited mods and im only one step below what ur running. Thanks for the help guys.
 

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Keep coming back, I'm sure you can help others with their problems and we love talking atvs
 

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Discussion Starter #9
Oh i will for sure. but u were saying winter to summer u have to change ur jets? Cuz i dont think ive ever done that but it makes sense now that u say it.
 

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Usually going up one size on the pilot jet for the winter months works. Assuming you're jetted correctly during the summer.

Do you have any problems during the summer or did this just come about?
 

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Discussion Starter #11
The jetting was fine in the summer altho just this winter i took off the air box lid and got an outerwear. The only other thing i did was pull the spark arrestor out. The thing is i dunno if it bored or anything cuz ive never opened the motor up cuz its always just ran perfect never smoked or anything like that. But i got it from some ppl who lets just say had no clue what they were doing with it.
 

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Put your lid back on and go up one size on your pilot jet. See how she runs!
 

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I would just stick the lid back on that should solve your lean issue or drop back to the stock 38 slow jet and see if it richens up. but Red is correct about jetting for the climatic changes from summer to winter. Stock engine do not need this I would also turn in the pilot screw about 1/4 to 1/2 turn and reset the idle and see how it does before ripping off the carb.
 

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Discussion Starter #14
In the summer the jetting seemed fine i mean the plug was a light brown everytime i changed it. This winter was when i took the lid off and got the outerwear so i figured i would need to rejet it. I had a 128 and a 38 before winter. So i only went one step up i guess.
 

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Discussion Starter #15
Thank You guys for all your help but i got one more question. Would my needle being set 2nd from the top cause the issue im having?
 

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With just a hmf slippy you shoud have stock jetting except a 125 main jet.
 

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Discussion Starter #17
I got a hmf slippy removed airbox lid and a k&n with outerwear and i took the spark arrestor out if that means anything?
 

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I just replied to your PM.
 

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I'd say put the lid back on and put a 125 main in with stock pilot and you should be good to go.
 

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134 and a 40 pilot is a bit much drop down on the jets after you try what i told you in yourom.
 
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