The gray wire & jetting???
Posted May 16, 2002 - 02:16 PM
Any advice is welcome
Posted May 16, 2002 - 04:51 PM
There is a whole new bike just waiting for you. On the 250F forum, there is a CDI 101 post that describes what the CDI and grey wire do. There are numerous posts on how to find it and cut it. This is going to be good for you.
The jetting is going to be even better. The cutting out and running out of gas symptom you have is because it is too rich. In fact, it is too rich everywhere. You can get by dropping to a main in the 165 168 range and lowering your needle two or three positions (1 or 2 from stock). It will still tend to foul with the original pilot. The real deal is a needle change. Taffy will probably chime in here, he's the guy you really need. I use a FHN needle, he and JD used to recommend a DMM or EMM needle but they tended to run close to the lowest clip position, so Taffy recently revised just the clip position part of it. Doing that will require an even smaller main jet. Don't be afraid, this is the key to power. It won't cost $40 bucks for the needle and a couple of jets.
The YZ cam timing changes the power considerably, mainly moving it from the bottom to the midrange. Up to you on that one. I've had both twice and don't really have a preference.
Posted May 17, 2002 - 01:57 PM
About the jeting thing I read some were that the pipe would make the motor use more air and I thought more air more fuel so thats why I made it richer. Ill try your advice still and see how it gose. Thanks again for the advice
Posted May 17, 2002 - 05:58 PM
Yeah, the open pipe needs more fuel. Taffy touts a change of 10 in the jet number for an open pipe. But they are already rich on the top and choked down in the middle. Try the current Taffy recommendation for a needle (was EMM which still works but new one involves more central clip position) with a small pilot and small main jet.
Posted May 17, 2002 - 11:01 PM
keep reading. there are plenty of posts on everything here.
your stutter is because the needle is too high so drop it one position.
as MC says the MJ you want with that pipe would be about 162 and an E needle. if you go with the D needle go to a 168MJ
i would do the MJ first. this will lean off the juice where the needle works and you may not need to move it after the change.
Posted May 18, 2002 - 05:05 AM
You did not mention if you removed air box lid and throttle stop.. YZ timing= Releasing the Hounds!
Check in history there is about weeks worth of reading, then if you have any troubles, your fellow thumper's will guide you through it...
Posted May 18, 2002 - 08:14 AM
Posted May 18, 2002 - 09:03 PM
your're the first person ever to ask that question