Thread: Jetting for Unported Carbed 1300
09-05-2007, 10:56 PM #1
Jetting for Unported Carbed 1300
What jetting should I use for a nonported, 150 psi compression, stock 1300 with stock 1200 carbs? The ski also has FF and D-plate.
This is my guess. I want to see how close it is.
1.5 N&S black 80 gram spring
Hopefully someone can tell me what it really should be.
09-05-2007, 11:12 PM #2
Starting off by saying " I don't know".
Can't imagine it being to far off from the 12. 130m would be a good start IMO but the 80 gram spring seems a little low. I would stay with the 95.
I think Philip GPR had a setup like this at one time. Maybe he can shed a little light.
09-05-2007, 11:15 PM #3
Jim, has always ran the 80 gram springs, I think he has anyway. You would think that it would cause a rich bogg down low but not on his skis!
09-06-2007, 12:46 AM #4
Jim, my ported 1300 with 1200 carbs did not like 135 mains. I ended up with 125 mains and the hi's are at 1.25 turns out for max rpms. With the 135 mains, the hi's gave best rpms at only 1/4 turn out. I would think stock 1300 cyls would need 120-125 mains. I have the same 80 gram springs and 1.5n/s but this setup has a 95 main jet in the return line which nets me 6 psi of fuel pressure at wot. It is spot-on with this setup.
09-06-2007, 06:45 AM #5
my compression is really high (170) so I wanted the extra fuel
I also lowered the timing and use 94 octane
As you can see I have also been using a low pop-off
the low end was clean, though a little lazy
above about 4000/4500 it pulled really hard
on the top it was delivering the right amount of fuel
I cruise this ski all day and often play running buoys - the extra fuel from the larger pilot and lower pop-off help keep everthing happy
09-06-2007, 07:24 AM #6
I'm running unported 1300 jugs with 1200 carbs. Still running her rich but I think we have the jetting where it needs to be.
not sure on the spring, maybe TCR, my trusty wrench and tuner will chime in.
09-06-2007, 07:47 AM #7
I wrote this down from a thread a while back - I searched everywhere this morning and couldnt find the thread - just figured I would throw it out there
Stock Carbs =
09-06-2007, 09:51 PM #8
- Join Date
- May 2005
80 gram spring
Start then highs at 2 turns out
09-06-2007, 10:02 PM #9
09-06-2007, 11:21 PM #10
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