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Winter Jetting Question

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So I'm looking to do some winter riding on my 2001 RM125, however i'm not sure about the jetting. I know you're suppose to go a bit richer in the winter to compensate the air density difference. In warmer weather, I can tell that the bike is running rich already because the spark plug is black, and I experience a bit of spooge (not too much though). Due to this, would I be safe just doing nothing in terms of jetting for winter riding?

 

The temperature was -5C out today with heavy snowfall, and the bike was unusually difficult to start (10-20 kicks maybe). However, it was also the first time I attempted starting during a heavy snowfall. I feel some adjustment should be taken though..

 

Thanks in advance!

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Bump up the pilot about 3 sizes.

The main will be about 4-5 sizes.

Raise the needle (lower the clip) 1-2 positions. A thinner needle would be a good thing too. The straight portion (fattest part of the needle) of the needle is available in thinner (richer) sizes. If yiu choose to buy a needle, go about 2 sizes thinner.

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