single carb jetting - Yamaha ATV Forum
 
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post #1 of 8 Old 08-26-2018, 10:51 AM Thread Starter
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single carb jetting

looking for help for jetting on a 2 into 1 kit with a 34mm carb!!
i have no idea where to start and all i can find are forums with guys at sea level.
what i have now is a 185 main 60 pilot and a DEL needle (middle notch) air screw 1.5 turns out my elevation is 4500 ft

things i have done are:
stock bore
t5 pipes and silencers
cooled head
ricks hot shot cdi box (advanced timing 5* on top end)
k and n filter

any help would be greatly appreciated!!!

Last edited by Alex Bergman; 08-26-2018 at 12:08 PM. Reason: forgot something
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post #2 of 8 Old 08-27-2018, 09:24 AM
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we would need more info to help. there is no magic number for jetting. it is always trial and error. i would need to know the problems you are having with your current jetting and plug color. at 4500 feet i would start a couple sizes smaller on the main and one down on the pilot and see where she is at.
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post #3 of 8 Old 08-27-2018, 11:01 AM
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PJ34 carb?
If so, 185 is way too high, same with the 60 pilot.
Should be around 150 and 50.
Also ditch the cdi and go OEM.
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post #4 of 8 Old 08-27-2018, 04:57 PM
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I'm running a 152 at 2800 ft. with 50 pilots. Pretty much the same setup as you.

01' Raptor 720, Stage 2, FCR'd
97' 250 Vitos Blaster
06' Rhino 450
94' Banshee T-5's, Vforce, ported, Cool Head, 2-1
06' Wolverine 450 - Stock!
06' LTZ 440
94' Vmax4 750, 96' 600 MountainMax, 07' Nytro(b00sTed)
06' Vmax 1200
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post #5 of 8 Old 08-27-2018, 08:29 PM Thread Starter
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Quote:
Originally Posted by cory52000 View Post
we would need more info to help. there is no magic number for jetting. it is always trial and error. i would need to know the problems you are having with your current jetting and plug color. at 4500 feet i would start a couple sizes smaller on the main and one down on the pilot and see where she is at.
i should have started with why i think my jetting is off,
i feel like there is no bottom end and when i hit the throttle it bogs out and then quickly hits the rev limit with little to no power band. after installing new plugs and running it for a bit, the plugs show that it is rich and plugs are almost oil fowled. (dark brown and wet)
the carb is a pj67 keihin carb, the research i have done shows it is a 34mm carb.
im looking for a good starting point because with the symptoms i have, i feel like its way off, and i can go from there.
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post #6 of 8 Old 08-28-2018, 02:01 AM
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sounds to me like digger has a good place for you to start. judging by his numbers you would be really rich with your numbers. my guess is you will still be rich there but you dont want to melt anything so its better to sneak up on it. my guess is you are rich but if you dont get any improvement dropping down make sure your crank seals are good and you are not sucking trans oil. ( honestly i have never had a banshee motor apart and am assuming they are similar to other 2 strokes i have worked on where bad crank seals will suck oil) digger is the pro for sure on these i am just trying to help and learn for my self
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post #7 of 8 Old 08-28-2018, 08:18 AM
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i would suggest ditching pj, because when you twist the choke, it fucks with the air screw and can cause jetting issues.
leak down test it for air leaks.
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post #8 of 8 Old 08-28-2018, 07:51 PM Thread Starter
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i did notice when i mess with the choke it does mess things up.
i think i will do the leak down test first off before anything and then move to jetting
Thank you for your help and suggestions!
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banshee, banshee 350, banshee carb ajustments, banshee carbs

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