Brand new tbr7 won’t stay running

James2727 · 07-23-2021, 01:21 AM

I bought 2 new tbr7 and put them together I also bought new clone carbs for them. I put a 110 main jet in both of them and left everything else the same. I then set the air/fuel screw 2 and half turns out. One bike is running good and the other I can’t get to stay on the exhaust gets hot really fast when I can get it to stay on for a few seconds and I can smell strong odor of gas. What could be wrong. Any help is appreciated

TxTaoRider · 07-23-2021, 05:41 AM

Welcome to the forum!

Did you check your valve lash on both bikes?

Afterwards, check and adjust the float levels, as they seem to be as all over the board when they arrive on the clone carbs. Then check and clean out the carbs. The sometimes have machining debris still inside the bowls and passages.

Also inspect your intake boot for tightness and cracks. Theres stories on here about having cracked boots on new bikes.

Good luck and keep us posted.

**JerryHawk250** · 07-23-2021, 08:27 AM

Sounds like it real lean. What size pilot jet are you running. The main jets doesn't control idle. Like TxTaoRider said. Check for air leaks in intake. 2 1/2 turns out on the idle mixture screw would indicate too small of an idle jet as well.

cycleway4 · 07-23-2021, 11:00 AM

If you come to a standstill,...no progress,....maybe switch the carbs-and-intakes from one to the other? if it still doesn't run good, you've eliminated quite a few items and yes, don't overlook the valve adjustment

James2727 · 07-23-2021, 11:03 AM

I will try all these suggestions today and let you know. The only thing I changed in them was the main jet everything else was what came with it I will let you know. Will the muffler not being connected to the manifold good cause it not to run?

Bill Hilly · 07-23-2021, 11:09 AM

To restart it ,does it take choke, or no choke? If it has to have the throttle wide open to restart is is rich. Really lean, or even possibly a blocked exhaust could explain the over heating issue. I guess it could be possible that the inner catalitic converter could have been crushed in manufacturing , and restricting exhaust flow even more than they normally do.

James2727 · 07-23-2021, 11:14 AM

I have to have choke on to get it started and if I let off the throttle it will not stay on but seems while it is on the exhaust gets extremely hot.

James2727 · 07-23-2021, 11:21 AM

I forgot to say after I could not get it to run with the clone carb I bought I put the stock one back on it and the bike is doing the same thing. So I don’t know if it’s the carb or not I am taking carbs apart today.

Bill Hilly · 07-23-2021, 11:23 AM

Quote:

Originally Posted by James2727

I have to have choke on to get it started and if I let off the throttle it will not stay on but seems while it is on the exhaust gets extremely hot.

Then it is lean, not getting enough fuel for the air it draws. Definitely check the valves ,and look for intake leaks. I would try the carb off the one that runs well. On cars some people take an open,but unlit propane torch all around the intake,and carb to trace down a vacume leak on a running motor.

**JerryHawk250** · 07-23-2021, 11:26 AM

Adjust the valves first then proceed with trying to tune the carb. A high idle will also make the engine heat up faster. Idle should be around 1500-1600 rpms. Check for intake leaks or lose or disconnected vacuum lines.

Bill Hilly · 07-23-2021, 11:40 AM

When you adjust the valve be sure to keep the small square headed adjustment screw from turning with the locknut. Re check clearance after tighting the lock nuts.

James2727 · 07-23-2021, 11:45 AM

Thank you I will try it today and let you know

J4Fun · 07-23-2021, 11:49 AM

Do all of the above but first look into the exhaust pipe for any obstruction! I live in the land of mud wasps is why my thought!

James2727 · 07-23-2021, 12:59 PM

Will this being loose on one side cause it not to run or cause the pipe to get real hot?

James2727 · 07-23-2021, 01:01 PM

This is picture

07-23-2021, 01:21 AM	#1
James2727 Join Date: Jul 2021 Posts: 15	Brand new tbr7 won’t stay running I bought 2 new tbr7 and put them together I also bought new clone carbs for them. I put a 110 main jet in both of them and left everything else the same. I then set the air/fuel screw 2 and half turns out. One bike is running good and the other I can’t get to stay on the exhaust gets hot really fast when I can get it to stay on for a few seconds and I can smell strong odor of gas. What could be wrong. Any help is appreciated
	0

07-23-2021, 05:41 AM	#2
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	Welcome to the forum! Did you check your valve lash on both bikes? Afterwards, check and adjust the float levels, as they seem to be as all over the board when they arrive on the clone carbs. Then check and clean out the carbs. The sometimes have machining debris still inside the bowls and passages. Also inspect your intake boot for tightness and cracks. Theres stories on here about having cracked boots on new bikes. Good luck and keep us posted. __________________ 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"
	1

07-23-2021, 08:27 AM	#3
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,561	Sounds like it real lean. What size pilot jet are you running. The main jets doesn't control idle. Like TxTaoRider said. Check for air leaks in intake. 2 1/2 turns out on the idle mixture screw would indicate too small of an idle jet as well. __________________ 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
	1

07-23-2021, 11:00 AM	#4
cycleway4 Join Date: Feb 2007 Location: Virginia Posts: 269	If you come to a standstill,...no progress,....maybe switch the carbs-and-intakes from one to the other? if it still doesn't run good, you've eliminated quite a few items and yes, don't overlook the valve adjustment __________________ <div>Steve 2006 Roketa DB-07A/RSX-200E 2008 Roketa 250 Scooter 2019 Brozz 250
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07-23-2021, 11:03 AM	#5
James2727 Join Date: Jul 2021 Posts: 15	Thank You I will try all these suggestions today and let you know. The only thing I changed in them was the main jet everything else was what came with it I will let you know. Will the muffler not being connected to the manifold good cause it not to run?
	0

07-23-2021, 11:09 AM	#6
Bill Hilly Join Date: Feb 2021 Posts: 934	To restart it ,does it take choke, or no choke? If it has to have the throttle wide open to restart is is rich. Really lean, or even possibly a blocked exhaust could explain the over heating issue. I guess it could be possible that the inner catalitic converter could have been crushed in manufacturing , and restricting exhaust flow even more than they normally do.
	1

07-23-2021, 11:14 AM	#7
James2727 Join Date: Jul 2021 Posts: 15	Choke on I have to have choke on to get it started and if I let off the throttle it will not stay on but seems while it is on the exhaust gets extremely hot.
	0

07-23-2021, 11:21 AM	#8
James2727 Join Date: Jul 2021 Posts: 15	Stock carb I forgot to say after I could not get it to run with the clone carb I bought I put the stock one back on it and the bike is doing the same thing. So I don’t know if it’s the carb or not I am taking carbs apart today.
	0

07-23-2021, 11:26 AM	#10
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,561	Adjust the valves first then proceed with trying to tune the carb. A high idle will also make the engine heat up faster. Idle should be around 1500-1600 rpms. Check for intake leaks or lose or disconnected vacuum lines. __________________ 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
	1

07-23-2021, 11:40 AM	#11
Bill Hilly Join Date: Feb 2021 Posts: 934	When you adjust the valve be sure to keep the small square headed adjustment screw from turning with the locknut. Re check clearance after tighting the lock nuts.
	0

07-23-2021, 11:45 AM	#12
James2727 Join Date: Jul 2021 Posts: 15	Thank you I will try it today and let you know
	0

07-23-2021, 11:49 AM	#13
J4Fun Join Date: May 2021 Posts: 285	Do all of the above but first look into the exhaust pipe for any obstruction! I live in the land of mud wasps is why my thought!
	0

07-23-2021, 12:59 PM	#14
James2727 Join Date: Jul 2021 Posts: 15	Picture Will this being loose on one side cause it not to run or cause the pipe to get real hot?
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