brand new xpro hawk glowing exaust

sburk · 10-30-2023, 08:18 PM

hello everyone new to the forum and to china bikes.
i just got a new xpro hawk 250 today. i put it all together and let it run and and cool a few times.
after that i ran the gas station and got some gas and when i got home the exhaust pipe right at the head was glowing red. i have not rejetted it yet
from what every one on you tube has said they run lean from the factory.
is this the problem? if so what size jet do you think i need? i am at 696 feet above sea level. i am keeping the stock carb for now but will mostlikly get a nibbi at some point.

XLsior · 10-30-2023, 08:39 PM

If its a tamper proof carburator then prior to any modifications to jetting, try adding a small washer as a needle shim to 'richen' the mix...it might not be perfect but it will be the easiest thing to change to help with an overall lean burn while riding on the throttle.

as the needle position will have little to no effect on the pilot circuit.

**JerryHawk250** · 10-30-2023, 08:40 PM

There is no exact jet size. You will need to get a set of jets and try until you get the correct size for you particular bike. Start off with a 110 main and work your way up until you fine what runs the best.

sburk · 10-30-2023, 09:23 PM

Quote:

Originally Posted by XLsior

If its a tamper proof carburetor then prior to any modifications to jetting, try adding a small washer as a needle shim to 'richen' the mix...it might not be perfect but it will be the easiest thing to change to help with an overall lean burn while riding on the throttle.

as the needle position will have little to no effect on the pilot circuit.

i am aware its tamper proof. i have watched a lot of motocheez videos. i am going to try and slot the screws and switch the main jets when they get here hopefully tomorrow.
am i right about it being to lean that is why the pipe got red?
thanks for your help

sburk · 10-30-2023, 09:25 PM

Quote:

Originally Posted by JerryHawk250

There is no exact jet size. You will need to get a set of jets and try until you get the correct size for you particular bike. Start off with a 110 main and work your way up until you fine what runs the best.

from all the vids i have watched lately it seems around 110/115 seam to be what a lot of people are using
thanks for the reply

**JerryHawk250** · 10-30-2023, 09:30 PM

Quote:

Originally Posted by sburk

from all the vids i have watched lately it seems around 110/115 seam to be what a lot of people are using
thanks for the reply

That's a good place to start on a stock setup.

Tomshell · 10-30-2023, 11:37 PM

Sure sounds too lean. Pull the plug and look at its color. Should have some color. Reference a plug chart online and see what that says. Or better yet take a picture of the plug and post it...

Tomshell · 10-30-2023, 11:55 PM

In fact, I can only remember a few times when I saw a bike exhaust glow red....I would be a bit concerned. Could be a bad exhaust valve too.

**JerryHawk250** · 10-31-2023, 07:29 AM

I would suggest adjusting the valves first. Yew we know it's a new bike but most of these Chinese bikes come from the factory with the valves set with little to no gap. This will save you a lot of headaches when it comes to tuning the carb.

sburk · 10-31-2023, 05:00 PM

UPDATE
i pulled my valve cover off and set the valves. first time i did it i set them to what a video said .005 exhausts and .004 on intake. i was top dead center according to the fly wheel and when i got done they the chatter was ridicules. i got on here and looked through the forums and found a post saying that they should be set to .04mm intake and .05mm for exhaust and that the piston hits tdc 2 times once on compression and once on combustion. (didnt think of that but makes sense now that i think about it ) anyway set them and they sound way better.

i got my jets in the mail i put a 115 mikuni jet in after breaking in to the carb with a dremal. she is running great thanks for the help guys its very friendly around here. im glad to be a member

i am going to start a new thread on here at some point and keep all my question and updates there to keep it easy

10-30-2023, 08:18 PM	#1
sburk Join Date: Oct 2023 Location: north east missouri Posts: 89	brand new xpro hawk glowing exaust hello everyone new to the forum and to china bikes. i just got a new xpro hawk 250 today. i put it all together and let it run and and cool a few times. after that i ran the gas station and got some gas and when i got home the exhaust pipe right at the head was glowing red. i have not rejetted it yet from what every one on you tube has said they run lean from the factory. is this the problem? if so what size jet do you think i need? i am at 696 feet above sea level. i am keeping the stock carb for now but will mostlikly get a nibbi at some point.
	0

10-30-2023, 08:40 PM	#3
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,851	There is no exact jet size. You will need to get a set of jets and try until you get the correct size for you particular bike. Start off with a 110 main and work your way up until you fine what runs the best. __________________ 2025 Lifan KPT 400 2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 (Sold) 2016 Black Hawk 250 (sold) 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	0

10-31-2023, 07:29 AM	#9
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,851	I would suggest adjusting the valves first. Yew we know it's a new bike but most of these Chinese bikes come from the factory with the valves set with little to no gap. This will save you a lot of headaches when it comes to tuning the carb. __________________ 2025 Lifan KPT 400 2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 (Sold) 2016 Black Hawk 250 (sold) 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	3

10-30-2023, 08:39 PM	#2
XLsior Join Date: Aug 2020 Location: Australia Posts: 1,635	If its a tamper proof carburator then prior to any modifications to jetting, try adding a small washer as a needle shim to 'richen' the mix...it might not be perfect but it will be the easiest thing to change to help with an overall lean burn while riding on the throttle. as the needle position will have little to no effect on the pilot circuit.
	1

10-30-2023, 11:37 PM	#7
Tomshell Join Date: Sep 2023 Posts: 28	Sure sounds too lean. Pull the plug and look at its color. Should have some color. Reference a plug chart online and see what that says. Or better yet take a picture of the plug and post it...
	0

10-30-2023, 11:55 PM	#8
Tomshell Join Date: Sep 2023 Posts: 28	In fact, I can only remember a few times when I saw a bike exhaust glow red....I would be a bit concerned. Could be a bad exhaust valve too.
	0

10-31-2023, 05:00 PM	#10
sburk Join Date: Oct 2023 Location: north east missouri Posts: 89	UPDATE i pulled my valve cover off and set the valves. first time i did it i set them to what a video said .005 exhausts and .004 on intake. i was top dead center according to the fly wheel and when i got done they the chatter was ridicules. i got on here and looked through the forums and found a post saying that they should be set to .04mm intake and .05mm for exhaust and that the piston hits tdc 2 times once on compression and once on combustion. (didnt think of that but makes sense now that i think about it ) anyway set them and they sound way better. i got my jets in the mail i put a 115 mikuni jet in after breaking in to the carb with a dremal. she is running great thanks for the help guys its very friendly around here. im glad to be a member i am going to start a new thread on here at some point and keep all my question and updates there to keep it easy
	2