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General Category >> Rubber Side Down! >> Would a larger pilot jet fix this?
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Message started by 94camroz28 on 08/15/14 at 16:28:16

Title: Would a larger pilot jet fix this?
Post by 94camroz28 on 08/15/14 at 16:28:16

Looking for input on my '07 S40. Its completely stock inside and out. I've just recently gone through about everything to get the bike to run. (bought as a non running project). The carb is clean, raptor petcock, new spark plug.

Anyhow, I recently adjusted the idle screw about 3/4 turns richer, hoping to get rid of the back fire while slowing down. This did indeed fix the problem, as I now get a small burble at the most.

The issue I have now is at lower RPMs, the bike feels like its surging or hunting. If I select half choke, the bike runs its best. It instantly runs smoother, sounds better, and rpms raise a bit. This is well after the bike is warm.

With this happening, would a larger pilot jet fix the issue? Above 1/2 throttle it seems fine. What exactly is half choke doing, as this is what it seems to like most while under 1/2 throttle.

Thanks

Title: Re: Would a larger pilot jet fix this?
Post by Serowbot on 08/15/14 at 16:42:24

Sounds like it would,.. only cost ya' $6.00 to find out...

Title: Re: Would a larger pilot jet fix this?
Post by 94camroz28 on 08/15/14 at 16:48:42

4C5A4D50485D504B3F0 wrote:

Sounds like it would,.. only cost ya' $6.00 to find out...

I'll give it a try, thanks.

Title: Re: Would a larger pilot jet fix this?
Post by verslagen1 on 08/15/14 at 18:26:25

14194E4C405F42571F152D0 wrote:

The issue I have now is at lower RPMs, the bike feels like its surging or hunting. If I select half choke, the bike runs its best. It instantly runs smoother, sounds better, and rpms raise a bit. This is well after the bike is warm.

white spacer mod.

Title: Re: Would a larger pilot jet fix this?
Post by killeraxemannic on 08/16/14 at 21:06:03

I used to notice the surging before I changed my pilot jet and now that I have the correct size one in its much worse. Next for me is the spacer mod. I am not convinced jetting would help this. When I am done with the spacer mod I will let you know how it rides.