What Does "Sputtering" Mean? (Tao Motors TBR7)

Aufgeblassen · 10-07-2021, 06:25 PM

I was informed that my new 2021 Tao Motor TBR7 may "sputter" with the stock carburetor. I have not noticed anything like that during acceleration or at steady speed. But when decelerating with throttle off, is sputters/backfires a bit. Is that it?

buzz · 10-07-2021, 07:23 PM

HI you need bigger jets,more gas

Dusman · 10-08-2021, 10:59 AM

Backfiring during deceleration or letting off of your throttle indicates a lean pilot jet. Try going up one size in your pilot jet and see if this remedies it.

Aufgeblassen · 10-08-2021, 12:44 PM

Quote:

Originally Posted by Dusman

Backfiring during deceleration or letting off of your throttle indicates a lean pilot jet. Try going up one size in your pilot jet and see if this remedies it.

How does it matter if it happens? Sounds cool actually!

**JerryHawk250** · 10-08-2021, 03:22 PM

The backfiring is a sign of a lean idle mixture. Pilot jets is probably sized right. Try turning out the idle mixture screw to about 1 1/2 turn for a starting point and adjust from there. The idle mixture screw is located on the bottom side of the carb next to the bowl. It will have either a brass or plastic cap covering it that you will have to remove t gain access to it.

braindead0 · 10-08-2021, 05:21 PM

Quote:

Originally Posted by Aufgeblassen

How does it matter if it happens? Sounds cool actually!

Running too lean can damage your engine, that's why it matters.

Aufgeblassen · 10-08-2021, 05:53 PM

Quote:

Originally Posted by braindead0

Running too lean can damage your engine, that's why it matters.

They would not design it that way.

braindead0 · 10-08-2021, 06:06 PM

Quote:

Originally Posted by Aufgeblassen

They would not design it that way.

It's designed to run with a stoichiometric mixture of fuel/air at about a 14.7:1 parts air to fuel ratio. You're bike is running too lean, the engine is NOT designed to run under those conditions... too lean and it will be damaged.

mototech77 · 10-08-2021, 07:51 PM

Quote:

Originally Posted by Aufgeblassen

They would not design it that way.

You are giving the manufacturers too much credit. These bikes are fine for the money, but they lack in quality control and engineering. Braindead0 is absolutely right about possible damage, and JerryHawk250 has great advice on how to resolve it.

It’s your bike though, so if you really like the popping and are okay with engine damage, more power to you

TominMO · 10-09-2021, 10:04 AM

No vehicle which is subject to environmental emissions regulations is designed for optimal running; they are designed for passing emissions regs, i.e. they are too lean. If you have a carby bike, step one should be to get the air intake and carb jetting right. If you are not concerned about water splashing onto the filter, or the intake being submerged in creeks, toss the airbox if it has one and put on a clamp-on filter. Then adjust the carb, or get a better carb, to suit the improved air intake.

Aufgeblassen · 10-09-2021, 12:57 PM

Quote:

Originally Posted by TominMO

No vehicle which is subject to environmental emissions regulations is designed for optimal running; they are designed for passing emissions regs, i.e. they are too lean.

But it is advertised as: *Item does not have fmvss, NHTSA label*
*Please check with your local DMV to confirm street Legality*

Bruces · 10-09-2021, 01:24 PM

Clearly you must be right and everybody else around here is wrong .

J4Fun · 10-09-2021, 01:49 PM

Too listen, is too learn! Just thinking out loud!

culcune · 10-09-2021, 03:26 PM

Quote:

Originally Posted by TominMO

No vehicle which is subject to environmental emissions regulations is designed for optimal running; they are designed for passing emissions regs, i.e. they are too lean.

Ding, ding, ding! They are lean to pass the tests.

Quote:

Originally Posted by Bruces

Clearly you must be right and everybody else around here is wrong .

This! There are numerous members with years of experience on this site. Bruce is one of them. It has been determined with hundreds of members as unwitting test subjects that these bikes across the board as far as Chinese brands go set the carbs lean to pass the EPA offroad tests and the EPA/DOT tests. Many members have either rejetted the stock carbs (more difficult to do over the years as the carbs are more difficult to get into) or found better carbs on Amazon/Ebay which has remedied the problem.

On a side note, the LIfan X-Pect 200 and RPS Hawk DLX with fuel-injection have shown fuel-injection to be mostly reliable remedies.

TominMO · 10-10-2021, 05:38 AM

Quote:

Originally Posted by culcune

On a side note, the LIfan X-Pect 200 and RPS Hawk DLX with fuel-injection have shown fuel-injection to be mostly reliable remedies.

I would not look at it that way. To me, the one problem with EFI is that it is hard to change the stock settings compared to just swapping jets (or a whole carb) on a carby bike. The manufacturers make their EFI systems run lean too.

EFI is great for automatic altitude adjustment, but if it breaks it is not as simple to fix as a carby.

10-07-2021, 06:25 PM	#1
Aufgeblassen Join Date: Sep 2021 Posts: 85	What Does "Sputtering" Mean? (Tao Motors TBR7) I was informed that my new 2021 Tao Motor TBR7 may "sputter" with the stock carburetor. I have not noticed anything like that during acceleration or at steady speed. But when decelerating with throttle off, is sputters/backfires a bit. Is that it?
	0

10-08-2021, 10:59 AM	#3
Dusman Join Date: Jan 2018 Location: NC Posts: 218	Backfiring during deceleration... Backfiring during deceleration or letting off of your throttle indicates a lean pilot jet. Try going up one size in your pilot jet and see if this remedies it.
	0

10-08-2021, 03:22 PM	#5
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,585	The backfiring is a sign of a lean idle mixture. Pilot jets is probably sized right. Try turning out the idle mixture screw to about 1 1/2 turn for a starting point and adjust from there. The idle mixture screw is located on the bottom side of the carb next to the bowl. It will have either a brass or plastic cap covering it that you will have to remove t gain access to it. __________________ 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

10-09-2021, 10:04 AM	#10
TominMO Join Date: Sep 2021 Location: De Soto, MO Posts: 1,887	No vehicle which is subject to environmental emissions regulations is designed for optimal running; they are designed for passing emissions regs, i.e. they are too lean. If you have a carby bike, step one should be to get the air intake and carb jetting right. If you are not concerned about water splashing onto the filter, or the intake being submerged in creeks, toss the airbox if it has one and put on a clamp-on filter. Then adjust the carb, or get a better carb, to suit the improved air intake. __________________ 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
	1

10-07-2021, 07:23 PM	#2
buzz Join Date: Dec 2020 Location: Dayton Pa. Posts: 880	HI you need bigger jets,more gas
	1

10-09-2021, 01:24 PM	#12
Bruces Join Date: May 2018 Posts: 1,588	Clearly you must be right and everybody else around here is wrong .
	2

10-09-2021, 01:49 PM	#13
J4Fun Join Date: May 2021 Posts: 316	Too listen, is too learn! Just thinking out loud!
	0