New Brozz250 smoking

Oltzer · 04-14-2021, 08:35 PM

Is it Normal for smoke to be coming off of the exhaust near the motor on a new bike? It also is cutting off on its own after a few minutes of running

Big Bird · 04-14-2021, 08:56 PM

It's normal to get some burn off when you first start a new china bike.

I would pop the gas cap and see if it's a venting issue.

idle_purr · 04-14-2021, 09:00 PM

perfectly normal, that's new engine!!!

Megadan · 04-14-2021, 10:04 PM

Yeah, it's normal for a bit of a smoke show on brand new bikes. They are coated in a protective oil film for transport.

TxTaoRider · 04-14-2021, 11:05 PM

It's normal for the oil and paint to burn off when they're new, but it's not normal for them to shut off on their own. Check for loose intake bolts or a vacuum leak. That will cause the exhaust to get hotter than normal and make it overheat and quit. It's probably ok, but wont hurt to check.

Bill Hilly · 04-14-2021, 11:52 PM

Did you adjust your idle screw to about 1,400 RPMs ? Does it just go from a nice smooth idle to suddenly dying like someone turned the key off, or is it more like it gradually looses RPMs, and dies ?

Oltzer · 04-15-2021, 12:58 AM

I did adjust the idle screw after it seemed warmed up and had it around the 1500 mark. Definitely shuts off like someone turned the key. I’m going to check the bolts on both sides of the carburetor to make sure they are not loose tomorrow based on the potential vacuum leak mentioned.

Bill Hilly · 04-15-2021, 01:19 AM

I would bet it has more to do with spark than air,or fuel , if it just dies suddenly from a smooth fast idle. I don't know what the temperature is like were you live,but these motors get hot especially stationary, and idleing . Electronics have a way of acting up when exceptionally hot.

**JerryHawk250** · 04-15-2021, 08:51 AM

You also need to gain access to the idle mixture screw and tune it. You will have to remove the plug that is covering it up. I'm sure it's like most of these bikes, the idle mixture is probably set way to lean. But before you go nuts trying to tune it, adjust your valves. More than likely set with little to no gap.

Merlin · 04-15-2021, 10:19 AM

Quote:

Originally Posted by JerryHawk250

You also need to gain access to the idle mixture screw and tune it. You will have to remove the plug that is covering it up. I'm sure it's like most of these bikes, the idle mixture is probably set way to lean. But before you go nuts trying to tune it, adjust your valves. More than likely set with little to no gap.

Iam with Jerryhawk250 on this. If your valves are too tight this is what would happen.

Oltzer · 04-15-2021, 12:06 PM

I did actually adjust the valve lashing before ever starting the bike. I followed a "Joamon" doc i found somewhere that listed .003 for break-in. Its possible maybe I didn't do it right since its my first time doing it but basically followed the steps I saw online in a few videos.

Oltzer · 04-19-2021, 11:10 AM

As an update I pulled the spark plug (i had replaced with an NGK ) and found that the gap was high so I reset the gap to match what the Brozz manual had and it seemed somewhat better and stayed running without cutting off.

My next thought is the fuel/mixture screw on the carb - anyone have any pictures or know of a video that shows how to modify it - mine is either capped or broken so no screw driver will fit.

04-14-2021, 08:35 PM	#1
Oltzer Join Date: Apr 2021 Location: Harrisburg Pennsylvania Posts: 13	New Brozz250 smoking Is it Normal for smoke to be coming off of the exhaust near the motor on a new bike? It also is cutting off on its own after a few minutes of running
	0

04-14-2021, 08:56 PM	#2
Big Bird Join Date: May 2020 Location: California Posts: 169	It's normal to get some burn off when you first start a new china bike. I would pop the gas cap and see if it's a venting issue. __________________ 2020 Boom Vader Gen 2 2019 CSC TT250 2021 Kayo Fox 70
	0

04-14-2021, 09:00 PM	#3
idle_purr Join Date: Feb 2021 Location: NY Posts: 218	perfectly normal, that's new engine!!! __________________ NO HILL TOO STEEP NO MUD TOO DEEP The Brozz \| The Hawk Upgrades, Accessories, Etc... Assembly Checklist: Brozz 250 \| Hawk 250 ~idle_purr
	0

04-14-2021, 10:04 PM	#4
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,110	Yeah, it's normal for a bit of a smoke show on brand new bikes. They are coated in a protective oil film for transport. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	0

04-14-2021, 11:05 PM	#5
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	It's normal for the oil and paint to burn off when they're new, but it's not normal for them to shut off on their own. Check for loose intake bolts or a vacuum leak. That will cause the exhaust to get hotter than normal and make it overheat and quit. It's probably ok, but wont hurt to check. __________________ 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"
	0

04-14-2021, 11:52 PM	#6
Bill Hilly Join Date: Feb 2021 Posts: 1,003	Did you adjust your idle screw to about 1,400 RPMs ? Does it just go from a nice smooth idle to suddenly dying like someone turned the key off, or is it more like it gradually looses RPMs, and dies ?
	0

04-15-2021, 12:58 AM	#7
Oltzer Join Date: Apr 2021 Location: Harrisburg Pennsylvania Posts: 13	I did adjust the idle screw after it seemed warmed up and had it around the 1500 mark. Definitely shuts off like someone turned the key. I’m going to check the bolts on both sides of the carburetor to make sure they are not loose tomorrow based on the potential vacuum leak mentioned.
	0

04-15-2021, 01:19 AM	#8
Bill Hilly Join Date: Feb 2021 Posts: 1,003	I would bet it has more to do with spark than air,or fuel , if it just dies suddenly from a smooth fast idle. I don't know what the temperature is like were you live,but these motors get hot especially stationary, and idleing . Electronics have a way of acting up when exceptionally hot.
	0

04-15-2021, 08:51 AM	#9
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,713	You also need to gain access to the idle mixture screw and tune it. You will have to remove the plug that is covering it up. I'm sure it's like most of these bikes, the idle mixture is probably set way to lean. But before you go nuts trying to tune it, adjust your valves. More than likely set with little to no gap. __________________ 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 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
	1

04-15-2021, 12:06 PM	#11
Oltzer Join Date: Apr 2021 Location: Harrisburg Pennsylvania Posts: 13	I did actually adjust the valve lashing before ever starting the bike. I followed a "Joamon" doc i found somewhere that listed .003 for break-in. Its possible maybe I didn't do it right since its my first time doing it but basically followed the steps I saw online in a few videos.
	0

04-19-2021, 11:10 AM	#12
Oltzer Join Date: Apr 2021 Location: Harrisburg Pennsylvania Posts: 13	As an update I pulled the spark plug (i had replaced with an NGK ) and found that the gap was high so I reset the gap to match what the Brozz manual had and it seemed somewhat better and stayed running without cutting off. My next thought is the fuel/mixture screw on the carb - anyone have any pictures or know of a video that shows how to modify it - mine is either capped or broken so no screw driver will fit.
	0