sputter at full throttle

Audihuff · 04-10-2019, 09:16 AM

hello, as some of you know, i am a total noob! I got my first bike (hawk) about a 3-4 weeks ago. When temps for 15-35 degrees. 40 pilot 110 main jet. Now that it is 45-70 degrees here in Ohio.. I think that my main jet is running too rich because it will sputter / bog down at full throttle. Once in a while it will sputter at 1/2 throttle, rarely. what is the best method to diagnose what circuit / jet is running rich or lean?

**JerryHawk250** · 04-10-2019, 09:24 AM

Full throttle will be the main jet. If it ran fine with the cold weather then it must be running rich. Drop down to a 105. Are you still running the stock exhaust with the cat?

Alpha Reign · 04-10-2019, 09:25 AM

If you are at full throttle and are having problems, then your main jet needs to be adjusted. I'll try to find a picture that tells you what each jest does, but this article could help too.

Alpha Reign · 04-10-2019, 09:27 AM

I found the picture!

Audihuff · 04-10-2019, 10:15 AM

thanks fellas! i went on a morning ride, no issues with it being 45 degrees. if it does this again next 70 degree day, ill know where to look. I appreciate the fast responses!

04-10-2019, 09:16 AM	#1
Audihuff Join Date: Feb 2019 Location: Youngstown, OH Posts: 56	sputter at full throttle hello, as some of you know, i am a total noob! I got my first bike (hawk) about a 3-4 weeks ago. When temps for 15-35 degrees. 40 pilot 110 main jet. Now that it is 45-70 degrees here in Ohio.. I think that my main jet is running too rich because it will sputter / bog down at full throttle. Once in a while it will sputter at 1/2 throttle, rarely. what is the best method to diagnose what circuit / jet is running rich or lean? __________________ To light a candle, is to cast a shadow..
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04-10-2019, 09:24 AM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,561	Full throttle will be the main jet. If it ran fine with the cold weather then it must be running rich. Drop down to a 105. Are you still running the stock exhaust with the cat? __________________ 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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04-10-2019, 09:25 AM	#3
Alpha Reign Join Date: Aug 2018 Location: Ohio Posts: 131	If you are at full throttle and are having problems, then your main jet needs to be adjusted. I'll try to find a picture that tells you what each jest does, but this article could help too. __________________ Hawk 250 Lithium Battery, Mikuni Carb 110 main jet, Bark Busters with Mirrors, Extended Mixture Screw, 428 O-ring Chain, 17-15/40 sprockets, Digital Cluster, Cycra YZ250F Skid Plate, Oil Cooler
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04-10-2019, 09:27 AM	#4
Alpha Reign Join Date: Aug 2018 Location: Ohio Posts: 131	I found the picture! __________________ Hawk 250 Lithium Battery, Mikuni Carb 110 main jet, Bark Busters with Mirrors, Extended Mixture Screw, 428 O-ring Chain, 17-15/40 sprockets, Digital Cluster, Cycra YZ250F Skid Plate, Oil Cooler
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04-10-2019, 10:15 AM	#5
Audihuff Join Date: Feb 2019 Location: Youngstown, OH Posts: 56	thanks fellas! i went on a morning ride, no issues with it being 45 degrees. if it does this again next 70 degree day, ill know where to look. I appreciate the fast responses! __________________ To light a candle, is to cast a shadow..
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