Kayo Bull 200 Carb or A/F ratio adjustment

Driver72 · 12-30-2021, 12:28 PM

Hello all,

First post here. I bought two Kayo Bull 200's for my sons.
We've had them for about 3 months. I really didn't ride them much as I have a larger ATV for myself.
But yesterday I rode both my sons ATV's and noticed one of them didn't run quite as smoothly as the other. I tested the top speed of both and one went 39 mph in a two block period without hesitation. The other went 37 mph but took an extra block to get there and hesitating a bit.

Research told me that if an ATV with a carb bogs its running lean, if it sputters or hesitates while accelerating it's running rich. So it appears this one is running rich.

Anybody got pics of the A/F ratio screw on the Kayo Bull 200?
Which direction do you turn the screw to make it run more lean?

Thanks

TxTaoRider · 12-30-2021, 12:43 PM

If it hesitates under hard acceleration and there's no black smoke it's usually lean. It can also be the symptom of an old spark plug.

**JerryHawk250** · 12-30-2021, 12:52 PM

Depending on what carb you have. If it has a manual choke. It could be on half choke. If auto choke, The auto may not be working properly. At WOT there is no mixture setting. You will have to change the main jet. More than likely running lean.

12-30-2021, 12:28 PM	#1
Driver72 Join Date: Dec 2021 Posts: 1	Kayo Bull 200 Carb or A/F ratio adjustment Hello all, First post here. I bought two Kayo Bull 200's for my sons. We've had them for about 3 months. I really didn't ride them much as I have a larger ATV for myself. But yesterday I rode both my sons ATV's and noticed one of them didn't run quite as smoothly as the other. I tested the top speed of both and one went 39 mph in a two block period without hesitation. The other went 37 mph but took an extra block to get there and hesitating a bit. Research told me that if an ATV with a carb bogs its running lean, if it sputters or hesitates while accelerating it's running rich. So it appears this one is running rich. Anybody got pics of the A/F ratio screw on the Kayo Bull 200? Which direction do you turn the screw to make it run more lean? Thanks
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12-30-2021, 12:43 PM	#2
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	If it hesitates under hard acceleration and there's no black smoke it's usually lean. It can also be the symptom of an old spark plug. __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
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12-30-2021, 12:52 PM	#3
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,561	Depending on what carb you have. If it has a manual choke. It could be on half choke. If auto choke, The auto may not be working properly. At WOT there is no mixture setting. You will have to change the main jet. More than likely running lean. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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