2002 kdx200 jetting info

[minidog]

Purchased new bike in
september 2001.Loved power delivery but fouled plug second day. Leaned out oil ratio of mc-1 to 50;1 still fouled plug. Drilled out air box cover and guess what-more fouled plugs. Started reading your site and went with 155 main jet and 42 pilot at 1 turn out needle in mid position-still fouled plugs. Switched to a #7 plug and got good reading off of it with no fouled plugs-have also switched to mobil 1 mxt2 but now a am hearing crackling noises like bike is running rich. When jetting bike should I jet for #7 or # 8 plug. Riding in tight woods at sea level at about 85 degrees and can only getr into 3rd gear. Bike is completely stock and also when do I need to service top end and kps system. Bike lacks power like when new is this normal?

 

[Canadian Dave]

Given temps in your area and the riding conditions I'd consider moving the jet needle's clip to the second from the top position (#2), install a 152 main and fine tune from there.

I'd stick with the #7 plug and jet with that.

"Bike lacks power like when new is this normal" Yes poor jetting zaps a pile of power and throttle response.

When to service the top end? That's not an easy question to answer, there isn't a one size fits all answer and it will vary greatly depending on how you ride the bike, maintain the air filter etc. I'm do a compression test now and record the value in your log book then periodically take compression reading, record them, and compare them to the original.


David