Author Topic: 38mm mikuni jetting?  (Read 2254 times)

nevadanotch

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38mm mikuni jetting?
« on: July 26, 2010, 10:43:34 AM »
I just picked up a 38mm Mikuni TMX11 and I am looking for a base line for jetting for this carb.

It is a new take off from a 2001 CR250. The main jet is a 420 and the slow jet is a 35.

I have the following mods on my FL350:
80mm Wiseco
DG pipe with a FMF Quiet Core II silencer
Modified air box (used 6 small UNI 1" filters in lid)
No port work.
The elevation I will be running at is from 4500 to 9500 feet.


If anyone out there running a 38mm Mikuni with similar modifications could give me a guideline as to where to start jetting at I would greatly appreciate it!
High Speed Soil Sampler!

oscevans

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Re: 38mm mikuni jetting?
« Reply #1 on: July 27, 2010, 11:43:12 PM »
Quote from: "nevadanotch"
I just picked up a 38mm Mikuni TMX11 and I am looking for a base line for jetting for this carb.

It is a new take off from a 2001 CR250. The main jet is a 420 and the slow jet is a 35.

I have the following mods on my FL350:
80mm Wiseco
DG pipe with a FMF Quiet Core II silencer
Modified air box (used 6 small UNI 1" filters in lid)
No port work.
The elevation I will be running at is from 4500 to 9500 feet.


If anyone out there running a 38mm Mikuni with similar modifications could give me a guideline as to where to start jetting at I would greatly appreciate it!


ok im going the same way with the same carb, im in about 1500 ft they suggested i started with a 45 slow jet and to start with a
175 main jet. on the needle position since I don't know
if it is the same needle i have i suggest to start
on clip position 1 from the bottom up then test. hope this gives you a guide line, you can probably ask the guys from aftershockmotorsports.com there preatty cool they might give you a better idea on that type of elevation.

hoodlum

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Re: 38mm mikuni jetting?
« Reply #2 on: July 28, 2010, 04:32:16 AM »
Quote from: "nevadanotch"
I just picked up a 38mm Mikuni TMX11 and I am looking for a base line for jetting for this carb.

It is a new take off from a 2001 CR250. The main jet is a 420 and the slow jet is a 35.

I have the following mods on my FL350:
80mm Wiseco
DG pipe with a FMF Quiet Core II silencer
Modified air box (used 6 small UNI 1" filters in lid)
No port work.
The elevation I will be running at is from 4500 to 9500 feet.


If anyone out there running a 38mm Mikuni with similar modifications could give me a guideline as to where to start jetting at I would greatly appreciate it!


Man,that's a hard one...I think what ever you do,you will end up rich at 10,000 when it is lean at 5000..That's a big elevation change....Ever looked into a dial-a-jet?

oscevans

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Re: 38mm mikuni jetting?
« Reply #3 on: July 30, 2010, 06:46:53 PM »
have you made it work yet let us know how did it go  8)