Scooter not running properly

[pkscoots]

I have a 2014 TGB Tapo 50cc 2-stroke that;s not running properly. It will start but to keep running I need to hold the throttle open fully, and even then it only runs at idle speed. As soon as I release the throttle it dies. I have drained the fuel, cleaned the carburetor and put new fuel in. The fuel is reaching the carb, I am getting compression and spark, air intake seems to be fine. Any ideas as to what might be the problem?

[OddDuck]

I have a 2014 TGB Tapo 50cc 2-stroke that;s not running properly. It will start but to keep running I need to hold the throttle open fully, and even then it only runs at idle speed. As soon as I release the throttle it dies. I have drained the fuel, cleaned the carburetor and put new fuel in. The fuel is reaching the carb, I am getting compression and spark, air intake seems to be fine. Any ideas as to what might be the problem?

Have heard of exhausts gunking up with carbon deposits and needing to be cleaned out. 2-strokes depend on their breathing by pulses through the exhaust system, if it's getting clogged then that could be it. Maybe take the exhaust off and have a look, from the cylinder head end?

I've never cleaned a two-stroke exhaust myself so can't offer advice but there should be a vid or two on Youtube.

[Akzle]

Have heard of exhausts gunking up with carbon deposits and needing to be cleaned out. 2-strokes depend on their breathing by pulses through the exhaust system, if it's getting clogged then that could be it. Maybe take the exhaust off and have a look, from the cylinder head end?

I've never cleaned a two-stroke exhaust myself so can't offer advice but there should be a vid or two on Youtube.

that would be de-coking. easiest is to biff the muffler in a good bonfire, once it's cooled to can-just-hold-with-a-welding-glove temp, smack the shit out of it with a bit of wood, while holding it end-down.

[Akzle]

check also that your carb is not homahasexual, slipped clip, bent needley, fucked jet. and that your throttle cable is actuating through the range.

it's also likely your scoot is gay, so if you can remove whatever belt/ floss attaches the noisy bit to the little round rubber bit, that will eliminate that as a sauce of concern.

timing, too. make sure that your timing-enator is doing it's shit.

[Big Dog]

Does it run better cold (not run for 12 plus hours) than warm?

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[Big Dog]

If you have a look the carb end of the throttle cable is it slack?
If you run the grip through the full range of motion does the lever at the carb do the same?

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[pkscoots]

check also that your carb is not homahasexual, slipped clip, bent needley, fucked jet. and that your throttle cable is actuating through the range.

it's also likely your scoot is gay, so if you can remove whatever belt/ floss attaches the noisy bit to the little round rubber bit, that will eliminate that as a sauce of concern.

timing, too. make sure that your timing-enator is doing it's shit.

Wow, you're cool

[pkscoots]

Does it run better cold (not run for 12 plus hours) than warm?

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No, same whether it'c warm or cold. There is quite a bit of white smoke coming out of the exhaust as well as a few spots of black liquid...

[Akzle]

Wow, you're cool

i knw ryt?

[Akzle]

No, same whether it'c warm or cold. There is quite a bit of white smoke coming out of the exhaust as well as a few spots of black liquid...

and you have compression you say? are you sure?

also. and again for the terminably un-cool, get a cool guy to fucking check your benny and jets.

[Maha]

that will eliminate that as a sauce of concern.


Tomato or HP?

[Big Dog]

No, same whether it'c warm or cold. There is quite a bit of white smoke coming out of the exhaust as well as a few spots of black liquid...
Pull your spark plug.
Is it clean?
Sounds like you have not enough air or spark for the fuel.
2 banger or 4 banger?
4 banger: When was the oil last changed?
Both, do you have any pipes or hoses not connected?

Is there any play in your throttle cable?
When my PGO had similar symptoms the cable had just slipped enough that the auto choke never clicked off.

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[pkscoots]

Pull your spark plug.
Is it clean?
Sounds like you have not enough air or spark for the fuel.
2 banger or 4 banger?
4 banger: When was the oil last changed?
Both, do you have any pipes or hoses not connected?

Is there any play in your throttle cable?
When my PGO had similar symptoms the cable had just slipped enough that the auto choke never clicked off.

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2 stroke. Plug is little bit dirty, but wet and is sparking just fine. Have checked and as far as I cna see all pipes are connected. Took the air filter out and tried running without it (to check if filter blocked) but same result. No play in throttle cable

[MrMarko]

Wow, you're cool

Just ignore him like the rest of us :laugh:

[Big Dog]

Sounds like your back at getting someone to look at your carb.

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[Akzle]

Sounds like your back at getting someone to look at your carb.

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which i ticked off in post #4, again in #10

[Big Dog]

which i ticked off in post #4, again in #10
Never said you didn't. But there are some basics to check of before pulling the carb... especially as you damn near need to dismantle the scooter to get the carb on most of them... and carbs is something I pay for these days.
It usually works out cheaper than me attempting anything that small with hands this big.

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[Akzle]

Never said you didn't. But there are some basics to check of before pulling the carb

pretty sure our OP is as basic as they come...

[Oakie]

My daughter had one for a postie bike and it had similar problems.

As already mentioned, check the exhaust for coking up. That did happen to hers. Holes were drilled and I forget how but someone in an effort to fix it caused flame about two metres long to shoot out of the pipe and singed his face. You don't want to do that.

Also, and probably likely, is water in the tank. That was an ongoing issue because of something the way the tank was designed or positioned. They did fix it eventually somehow and off the top of my head I think isopropyl alcohol was involved.

Good wee bike though. Handled everything Queenstown could throw at it for the two or three years she used it on the run.

[FJRider]

White smoke means a new Pope has been elected .... are you Catholic ..???



... But there are some basics to check of before pulling the carb...

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Yep ... like replace the spark plug. Even if it "looks" fine. 2 strokes kill and maim plugs for little rhyme or reason (and can it in a very short time of running)

Check the fuel/oil ratio mixture is correct (and auto mix is still working) Too much or too little oil is not good.

As previously stated ... check there is no water/crap in the tank (possible cause of white smoke). Flush all lines and start with fresh.

[awayatc]

My daughter had one for a postie bike and it had similar problems.

As already mentioned, check the exhaust for coking up. That did happen to hers. Holes were drilled and I forget how but someone in an effort to fix it caused flame about two metres long to shoot out of the pipe and singed his face. You don't want to do that.

Also, and probably likely, is water in the tank. That was an ongoing issue because of something the way the tank was designed or positioned. They did fix it eventually somehow and off the top of my head I think isopropyl alcohol was involved.

Good wee bike though. Handled everything Queenstown could throw at it for the two or three years she used it on the run.

sounds good.

always go down to basics first:

Put in a brandnew sparkplug,

use new fuel.

good chance that your problems will be gone...

[MrMarko]

White smoke means a new Pope has been elected .... are you Catholic ..???




Yep ... like replace the spark plug. Even if it "looks" fine. 2 strokes kill and maim plugs for little rhyme or reason (and can it in a very short time of running)

Check the fuel/oil ratio mixture is correct (and auto mix is still working) Too much or too little oil is not good.

As previously stated ... check there is no water/crap in the tank (possible cause of white smoke). Flush all lines and start with fresh.

Yeap rf900 wouldn't start after 3 years sitting. stale fuel... flushed full fuel system cleaned carb and was backfiring and wouldn't run... so it had fuel and had spark.. (hence the backfire) ... pulled the plugs and all looked fine but were wet... bad fuel fowled them... go spend 30 bucks on plugs and it fired right up.

I'd certainly be spending $7 on a plug before trying to de-pepsi an exhaust.

[Oakie]

+1 on the plug.

Took a couple of years and hundreds of servicing dollars to get my bike running perfectly and the very last significant improvement was replacing the 'awesome' iridium plugs with bog standard ones. Hell of a difference.