Once again someone asking for jetting advice
 

I searched the site but I have been out of the 2T loop for a while and most is the posts I found only helped a little bit.

Without asking for too much of your time:

I am looking for a middle-of-the-road starting point for my 2010 300.

4000-6000' 30-50'F

Just need some suggestions to get me started.

Thanks

J

p.s. Looking to error a little on the rich side and I prefer more linear power deliver

One more thing
 

I promise to never ask the other dreaded question "where should I send my suspension"

I can't answer but have you spotted the other recent threads on ASI Vs ASII and the jetting database?

not sure about the temp, but i am on similar elevation and think the place to start is to buy an N3EH needle, second clip and go down one size from stock on the main jet and standard on the pilot

have you read this one?

http://www.gasgasrider.org/forum/showthread.php?t=8325

How does this sound?
 

This is what I found in the carb: (besides some old and nasty smelling fuel)

2010 300

Main 180

Pilot 40

NEF 3rd clip

Slide 7

How does this sound for 4000-6000' and 30-50' F ?

Thanks to all for your input

J

Sounds way too rich to me. How does it run?

Hmmmm
 

Not sure, have yet to start it.

Does it seem more like Sea Level jetting?

Well, I'm not sure about the needle, but the main and pilot seem awfully fat for your altitudes.

Your needle is an n1ef not nef...

If it were me - I would go with one of the following : GMPs recommendations (JD jetting) as a baseline, the n3 series needles or a cck, etc. and then de-rate for your altitude. Consider sea level main and pilot to be 178 main and 45/48 pilot for sea level when using a leaner needle. If the jetting is good at sea level or close to it, then the jetting compensation tables in the manual are accurate.

If you want to have a great working carb and don't want to do a bunch of tinkering - send it to Ron at RB-Designs for his carb mods. The nice thing about his modifications is that he internally mods the carb to add pilot circuit sensitivity - so you can quickly dial in changes for changing altitude & temps. He adds a knurled air screw adjuster that you can turn the air screw with a gloved hand, etc.

And, for those in the u.s. I would spend the money to have Ron massage the carb for you versus spending $70 on a JD jetting kit


jeff

P.S. send your suspension to Les at LT-Racing! ;)