more air fuel readings on 840.... - Kawasaki Teryx Forums: Kawasaki UTV Teryx Forum
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post #1 of 31 (permalink) Old 04-05-2010, 12:20 PM Thread Starter
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more air fuel readings on 840....

80 degrees...12.1 at idle and 12.8 at wide open and then at around cruising speed[the least amount of fuel to keep it steady at 50 mph] it is running high 10s and low 11s.i have stock needles with 2 shims under each with 205 and 210 mains.and .38 pilots.any advice here?thanks again guys
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post #2 of 31 (permalink) Old 04-05-2010, 12:44 PM
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The numbers actually look pretty good. Your target is 12.5-13.1. Maybe go to a #40 pilot jet for the cruising #'s I will be jetting my 840 kit soon. What air box & filter are you running? What elevation & part of the country are you at?

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post #3 of 31 (permalink) Old 04-05-2010, 02:04 PM Thread Starter
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im at 900 ft and ride to around 3000 ft but no higher.also i think i need to remove one shim and try to lean it up some.just kinda waiting for more advice before i do anything.it runs good right now.
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post #4 of 31 (permalink) Old 04-05-2010, 05:31 PM
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Pull the shims out one at a time to lean the mid range out.
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post #5 of 31 (permalink) Old 04-05-2010, 06:28 PM Thread Starter
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what number should i tune for mickey?
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post #6 of 31 (permalink) Old 04-05-2010, 06:42 PM
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Quote:
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what number should i tune for mickey?
I like to run the mid a little towards the richer side for torque,so 12.5 or there about.You are way rich now!
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post #7 of 31 (permalink) Old 04-05-2010, 08:39 PM
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Also,watch your wot AFR when you move the needles down;they are a tapered needle, clear to the end point,so, wot will be effected--(is that a word)

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post #8 of 31 (permalink) Old 04-06-2010, 04:28 PM Thread Starter
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i took 2 shims out and run it again......this time at 50 mph with the least fuel it takes im around high 12s and wide open is still bumping around high 12s and idle isin the 12s also....thats on the front cylinder...is that good enough wonder and i know i shouldnt even ask this but do i have to check the rear one too?im having hell out of taking the plugs in and out!!
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post #9 of 31 (permalink) Old 04-06-2010, 06:56 PM Thread Starter
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update.....i hooked the tuner to the rear cylinder and im running way lean......14 at idle and around 14 to 15 at wide open throttle and 14 at 50 mph where the front is at 12s...what to do now?also it seems that thew rear cylinder is jumping numbers and not staying as steady as the front.any ideas?
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post #10 of 31 (permalink) Old 04-06-2010, 07:31 PM
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Start with wot and go up two main jet sizes. Then re-check mid and idle. Mains will change everything. I think you know how to richen mid , but if mid and low idle wont get down were you want it then go to a #40 pilot jet 2 turns out on air fuel screw. Good thing you checked the rear.

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