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?

HI you need bigger jets,more gas

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.

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

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.
https://www.chinariders.net/attachme...1&d=1457400189

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

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.

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 ;)

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.

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

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

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

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

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.

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.