air fuel readings on 840.... - Kawasaki Teryx Forums: Kawasaki UTV Teryx Forum
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post #1 of 35 (permalink) Old 03-18-2010, 05:21 PM Thread Starter
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air fuel readings on 840....

after work this evening i used my lm1 guage i received yesterday...anyways on my front cylinder..heres what i come up with.around 11.5 at idle....14.0 to 14.9 at wide open ..and i have a miss that was killing me and made me buy the guage to see what was wrong and now i found out.i am running at 10s to 11s at where my miss is.and its at very little throttle to keep it at speed like at cruising speed....i have probably done damage to my engine for running it this lean this long..or maybe not..im not sure.i do know i am VERY tired of working on this junker.anyways...any tips on where to go from here?thanks.i also have the stock needles with 2 shims under each and 195-200 mains with #40 pilots.
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post #2 of 35 (permalink) Old 03-18-2010, 06:15 PM
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10 to 11s are rich not lean. You should target for around 13 - 13.5 across your throttle range. You air screw can go in a 1/2 turn to get that 11.5 up to near 13. The rest is your main jet and needle. But if you 14-14.9 you need to go up in jet size to add more fuel.
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post #3 of 35 (permalink) Old 03-18-2010, 06:53 PM
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Hey whitey. I feel your pain with that miss at steady throttle. My problem was fixed by putting the stock springs back on the vacuum slides. If you have not tried that.....I would. I don't know what all the rage is about the softer springs. They did not work here in Missouri anyways.
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post #4 of 35 (permalink) Old 03-18-2010, 07:34 PM Thread Starter
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my carbs are stock except for 195 and 200 mains.....with #40 pilots... and stock needles with 2 shims under them.
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post #5 of 35 (permalink) Old 03-18-2010, 07:47 PM
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Quote:
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my carbs are stock except for 195 and 200 mains.....with #40 pilots... and stock needles with 2 shims under them.
What ignition are you running & what curve is built for it
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post #6 of 35 (permalink) Old 03-18-2010, 08:24 PM Thread Starter
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dyna tak non programmable.....
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post #7 of 35 (permalink) Old 03-18-2010, 08:50 PM
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Need larger mains, take the two shims off needle and turn mixture screws in on turn at a time.

What intake you running? Reason I ask is the very large mains you have denote lack of vacuum in the intake and lack of fuel being metered right.




Last edited by Hunterworks; 03-18-2010 at 08:56 PM.
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post #8 of 35 (permalink) Old 03-18-2010, 08:52 PM Thread Starter
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stock intake with 6 -1inch holes in air box lid.filter is also stock.........
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post #9 of 35 (permalink) Old 03-18-2010, 09:02 PM
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Cover three holes then get a reading

If the stock hole was good enough for 749 CC and is about 3 square inches then nine is overkill for 100 more CC.

When you put all those holes in your intake you lost vacuum signal and then fuel didn't meter right so you had to have such a large jet just to get enough fuel in it. Fluid flows easier in a larger hole. You didn't need those big jets cause of all the air you flowing but the lack of fuel actually flowing thru jets.

Imagine drinking water thru a straw then I come along and poke a hole in the side of the straw, you can't suck near as much water cause you lost your vacuum.



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post #10 of 35 (permalink) Old 03-18-2010, 09:04 PM
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Quote:
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my carbs are stock except for 195 and 200 mains.....with #40 pilots... and stock needles with 2 shims under them.
Didn't need an A/F meter to cure the problem... we told you in the last post you made to remove atleast one shim on each needle. Ah, well least this way you can get your mains perfect for some added performance.

How is the stock hole good enough for 749CC? You know how much horse power the 08 Teryx motor makes with the stock hole? like 41-42 hp at the crank? A brute force with the same engine and carbs puts out 51hp. How is the stock hole good enough for 749CC? These motors need AIR FLOW and covering up holes isn't going to give that... The air rushing in creates more than enough vacuum to tune these motors without having to choke it to death trying to suck through a tiny straw.

Last edited by Shan; 03-18-2010 at 09:11 PM.
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