Help - new breakin

Islander · 08-16-2023, 09:54 PM

I just purchased a TBR7D. I changed oil, set idle, checked everything and then started bike for breakin. During the first minutte of the run up, the exhaust started glowing red and the heat shroud melted. Input is most welcome. What's up with this?

Texas Pete · 08-16-2023, 11:00 PM

The engine is basically running hot and needs cooling. Usually a sign the engine is running lean. Might be worth inspecting and if needed adjusting your valves now then when you have that done see how it runs with the current jets in the carburetor to see if it still runs lean.

TominMO · 08-16-2023, 11:10 PM

Also, make sure the bike is getting airflow, to cool the motor. Don't let it idle for long periods.

Bill Hilly · 08-16-2023, 11:25 PM

Do you mean the plastic muffler guard actually melted? I sometimes think that people may buy these bikes, and not realize what about 1,500 RPM sounds like. I can't imagine even a lean motor getting so hot in one minute. Like stated, you do need to change oil(which you've done), adjust valves, and at least install a more adequate main in the carb, but I don't really know how important the heat cycles that some people do are, but if that's what you're doing, and the motor gets that hot , it's probably doing more harm than good. If you do anymore, at least hold it in about half choke, to fatten it up some, but either way I can't imagine it getting so hot ,in a minute , of idle to melt the muffler plastic from just being jetted lean.

TarMack · 08-17-2023, 07:24 AM

I would definitely adjust the valves. Videos on youtube showing you how. It's easy.

**JerryHawk250** · 08-17-2023, 08:34 AM

As Bill Hilly mentioned. Make sure the idle is around 1,500 rpms. High idle will heat up the exhaust quick, especially with these lean tuned carbs.

TarMack · 08-18-2023, 07:17 AM

Exhaust glowing red... I would fear exhaust valve isn't fully closing. Can't think of what else would cause this. Let us know what you find.

08-16-2023, 09:54 PM	#1
Islander Join Date: Aug 2023 Posts: 1	Help - new breakin I just purchased a TBR7D. I changed oil, set idle, checked everything and then started bike for breakin. During the first minutte of the run up, the exhaust started glowing red and the heat shroud melted. Input is most welcome. What's up with this?
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08-16-2023, 11:00 PM	#2
Texas Pete Join Date: Nov 2022 Location: Dallas TX Posts: 579	The engine is basically running hot and needs cooling. Usually a sign the engine is running lean. Might be worth inspecting and if needed adjusting your valves now then when you have that done see how it runs with the current jets in the carburetor to see if it still runs lean. __________________ 2022 1/2 Templar X 250 - 6 gear model - 13 Front / 40 Rear Sprockets - #42 / #120 Jets - 1mm thick nitrile O-ring needle shim (removed) - Kenda K761 Dual Sport Tires - Sedona Standard Thickness Inner Tubes - Stock OEM battery, carburetor, spark plug still going strong - https://youtu.be/dhAYEKH-jFQ Texas Pete's Templar X 250 Torque Specifications Sheet Texas Pete's Engine Displacement Calculator Texas Pete's Tire and Rim Compatibility
	1

08-16-2023, 11:10 PM	#3
TominMO Join Date: Sep 2021 Location: De Soto, MO Posts: 1,876	Also, make sure the bike is getting airflow, to cool the motor. Don't let it idle for long periods. __________________ 2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself
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08-17-2023, 08:34 AM	#6
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,574	As Bill Hilly mentioned. Make sure the idle is around 1,500 rpms. High idle will heat up the exhaust quick, especially with these lean tuned carbs. __________________ 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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08-16-2023, 11:25 PM	#4
Bill Hilly Join Date: Feb 2021 Posts: 948	Do you mean the plastic muffler guard actually melted? I sometimes think that people may buy these bikes, and not realize what about 1,500 RPM sounds like. I can't imagine even a lean motor getting so hot in one minute. Like stated, you do need to change oil(which you've done), adjust valves, and at least install a more adequate main in the carb, but I don't really know how important the heat cycles that some people do are, but if that's what you're doing, and the motor gets that hot , it's probably doing more harm than good. If you do anymore, at least hold it in about half choke, to fatten it up some, but either way I can't imagine it getting so hot ,in a minute , of idle to melt the muffler plastic from just being jetted lean.
	1

08-17-2023, 07:24 AM	#5
TarMack Join Date: Aug 2023 Posts: 8	I would definitely adjust the valves. Videos on youtube showing you how. It's easy.
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08-18-2023, 07:17 AM	#7
TarMack Join Date: Aug 2023 Posts: 8	Exhaust glowing red... I would fear exhaust valve isn't fully closing. Can't think of what else would cause this. Let us know what you find.
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