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ducatipaso.org :: View topic - Mikuni jets
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Mikuni jets
http://www.ducatipaso.org/forum/viewtopic.php?f=1&t=2128		 Page 1 of 2
Author:  Finnpaso [ Thu Nov 22, 2007 1:17 pm ]
Post subject:  Mikuni jets
Ok, Guys, who have tuned they Mikunis:

What size main jets i shall try???

Modificatios to 750 Paso: Open pod filters(just "like" K&N, but cheaper ones). Open exhaust pipes with 40 mm headers and i drive normally in "sea level"(about here +0-400meters). I have already Dynojet kit Stage 1. (european version) for 750SS.

I think, i have all other jets ok, but what main jets?
Author:  eliatt [ Thu Nov 22, 2007 2:23 pm ]
Post subject:  Re: Mikuni jets
Hi,
Try 140 to 142.5 at first.
Author:  Finnpaso [ Thu Nov 22, 2007 2:45 pm ]
Post subject:  Re: Mikuni jets
I think, those are "way too big", cause my Mikunis came with 142.5 and they were in 900 Elephant earlier and in Dynojet kit there is 124 and 128 jets! Have anybody tried 128??? Stage 1. is designed for stock airbox or w.stock airbox with K&N filter, but mine have free flow pod filters instead normal K&N. What can be difference between main jets, if little different air filters?
Author:  paso750 [ Thu Nov 22, 2007 6:44 pm ]
Post subject:  Re: Mikuni jets
with open filters and exhaust I think 140 is a good start off. Whatever was on an Elephant, both 750 and 900 Supersport used 140 main jets from stock. Ducs need to run a little bit on the rich side.

G.
Author:  Finnpaso [ Thu Nov 22, 2007 7:39 pm ]
Post subject:  Re: Mikuni jets
What size You Gerhard use?
My Ducati friend have many sizes, so thats not problem, but wondering, that in Stage 1. kit is those jets.... Dont they know, what they put to kit?(with labelled note about open mufflers & K&N) Anyway totally different needles, than there was "as original". Anyway that main jet should function 100% only, when throttle is totally open and needle up... And i think, that 900 engine needs(uses) more fuel, than 750...
Author:  paso750 [ Thu Nov 22, 2007 8:12 pm ]
Post subject:  Re: Mikuni jets
I really don`t know anymore. Don`t even know in which box I put the carb :oops:
You know that the numbers on Dynojet parts have their own system and are not comparable to others ?
So far I remember I did not change the main jet so I guess it`s the 140 I`ve been using.

The original jetting of the 750SS is:

main jet: 140
main air jet: 70
needle jet: Y-6
Jet needle: 5C19 - 3rd notch from top
Pilot jet: 37,5
Pilot air jet: 60/1.4

The original jetting of the 900SS is:

main jet: 140
main air jet: 70
needle jet: Y-2
Jet needle: 5C19 - 4th notch from top
Pilot jet: 42,5
Pilot air jet: 60/1.4


G.
Author:  Gwenadu [ Thu Nov 22, 2007 8:18 pm ]
Post subject:  Re: Mikuni jets
from and old post: "I have 600 monster Mikuni carbs, KN cylindrics filters, very free home made cans, 150 jets and the needle at the upper level+1.6mm washers under the circlips. It runs well until 7000rpm but I think it is still a little lean over this speed... not often used!!!"... Now I have "Fedek" exhausts (idem DaveM ones)- less noisy and better balance at high RPM.
Author:  eliatt [ Thu Nov 22, 2007 9:18 pm ]
Post subject:  Re: Mikuni jets
Hi,
I use 140 main jets, and testing 145 on 750 sport with modified K&n filter element & after market cans.
I have installed the carbs ( taken from Monster 750 ) with the original 132.5 main jets, and when tested, were way to small .
Author:  Finnpaso [ Fri Nov 23, 2007 11:34 am ]
Post subject:  Re: Mikuni jets
So, it can be, that need close 140 jets....
Author:  Fraser [ Sat Nov 24, 2007 3:37 am ]
Post subject:  Re: Mikuni jets
Terve Antti,

My Mikunis are off a 1994 900SS, they came with a main jet size of 124.
The Dynojet Stage 2 kit came with 2 sets of main jets, a YJ144 (used if you have standard exhaust) and YJ148 to use if you have aftermarket exhaust. I've used the YJ148 and the bike runs really well, like trains toilet.
The kit also has slide springs, needles, washers etc. I have used foam pod type filters.

Fraser.
Author:  Finnpaso [ Mon Nov 26, 2007 2:37 pm ]
Post subject:  Re: Mikuni jets
Thanks, Guys, ill try those 142.5, what came with carbs :) Still waiting filters, should come close days. Already original throttle handly and choke are connected, also carbs are installed. Next fuel lines and tank for "breather pipes"(ill use one plastic can to all pipes and if problems, then put 2 cans). Btw, that original Weber throttle handly seems to work fine, so no need 2 cable system(that return spring is quite hard)... :twisted:
Author:  Finnpaso [ Mon Nov 26, 2007 2:40 pm ]
Post subject:  Re: Mikuni jets
Author:  Gwenadu [ Mon Nov 26, 2007 7:50 pm ]
Post subject:  Re: Mikuni jets
Author:  Finnpaso [ Mon Nov 26, 2007 8:10 pm ]
Post subject:  Re: Mikuni jets
Thanks Alain for tip :wink: In that original Paso handly is thread ready for 2. cable, so easy to fit such, if needeed. Anyway i am driving with this bike only summertime and not in high altitude, so i think, i dont need it. In whatkind condition Your carbs get icey? Anyway, thanks! 8)
Author:  Gwenadu [ Mon Nov 26, 2007 9:25 pm ]
Post subject:  Re: Mikuni jets
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