arteacher wrote on 06/22/12 at 07:44:08:I have Raask exhaust and a K&N slab filter. I have 55 pilot and 150 main jets installed with a 3/4 white spacer mod. I have a Dial-a-Jet installed. The mixture screw is 2 3/4 turns out. I drive around at roughly 1000' altitude. The plug looks good.
The specific problem I am having is the idle drops down too low, sometimes to the point of stalling, when I let off the throttle quickly from about 2000- 2500 rpm or higher. I have replaced the spring and the diaphragm in the TEV, and cleaned the carb thoroughly twice.
This problem disappears when running with the choke out one notch- in fact the bike runs much smoother that way, except that it is too rich.
Would going up to a 57.5 pilot be the solution? I ask because I have never heard of anyone running a pilot that large.
K&N filter and a Raask and you only did a 3/4 white spacer mod ?
The K&N and Raask moves more air for you so you need more fuel to mix with it. The Dial-a-jet picks up in the mid range but you could still have a lean spot in the 1/4-1/2 range. I would go to at least 1/2 white spacer, if not a bit more to richen the low-mid range crossover. If you have a good distinct setting on your pilot jet then you could possible to to a #57.5 to try.
I have a stock S40 with a small cone filter and an Emgo reverse cone muffler from RYCA. I am currently running a #52.5 pilot with the screw at 2 3/4 turns out and a #52.5 main jet. It runs smooth and strong and have twice hit 105mph indicated on the speedo on a flat freeway run.
The Emgo is as flow through as a muffler gets, at least as much as a Raask. I've not tried a #55 pilot or #155 main jet yet but will this weekend and see what if any difference that makes.