SMOKING 2 stroke?

Question

My moped, or scooter if you wish,is smoking. can someone help?
Oh, and i dont feel a loss of power. Thanks

its auto mix oil

Answer 1

Scooters are bad for building up deposits in the exhaust pipe. Remove the pipe from the machine and clean it with a parts solvent.

Gas, kerosene or any other petroleum product won't do the job because that type of material is what is causing the problem.

Good luck!

Answer 2

You either need to do a top end rebuild, or you have carbon build up. Rebuilding the top end isn't too hard but it's too involved for me to explain on here, carbon build up can be removed by pouring seafoam(any auto parts store) into the carb while the bike us running, with the idle turned up. It would help if you said what color the smoke is black(carbon) grayish-blue(oil) or white(coolant, which doesn't apply if your scooter is air cooled). A certain amount of smoke in normal with all 2-strokes, mopeds especially, probably because they are designed to last a long time, not produce a lot of power, so they burn more oil than say a motocross bike.

What P-Wee said is incorrect. running too much oil will actually cause a LEAN condition. There will not be enough fuel(lean) because it is being displaced by too much oil, and the bike will run hot or detonate. He is also incorrect about the ratio. I have never encountered a 2 stroke motor that required a 3:1 ratio, that's rediculous. Anywere from 25:1 to 60:1 is normal, with most motocross bikes at 32:1. I don't have much experiance with scooters, but since yours is auto inject, fuel:oil ratio is irrelevent to you anyway.

Answer 3

When you add fuel, make sure you premix the oil and gas to the manufacturer’s specifications. There should be a sticker or placard somewhere near the gas cap that specifies what type oil and the mixture. Example: 10 to 1, ten parts fuel to one part oil depending on what you are using as a measuring device. You want to keep within the manufacturer’s specifications because if you go too high on the oil, you lean out the fuel air ratio and can damage or burn the piston and or plug if the plug does not foul out first.

Answer 4

2 strokes will wear out the top end (piston, rings, cylinder) and start smoking before losing power. When/if you remove the exhaust pipe to try and clean it, look in the exhaust port of the cylinder with a flash light and mirror (if needed).
If you see any -
Scoring of the cylinder or piston
or
Discoloration below the rings (black-gold = worn rings)
The top end will need repair.

Answer 5

its your oil injection system and dont try to fix it if you dont have a book. i wouldnt anyway. find someone who knows about 2 stroke oil injection systems.it probably has gotten a little dirt or something in it. i think it might work with a mixture type screw but i dont know. i only know if you break it your done.and since the system uses oil, viscosities make it a lil tricky ive heard. good luck.
keep a spare spark plug and plug wrench with you.

Answer 6

All 2 strokes give off a smoky exhaust to a larger or smaller extent - depends on the system - autolube or pre-mix?

Answer 7

Yore Running "Rich" that is, your running way too much 2 stroke oil in your gas/ oil mix. simply next time you refill add 1 part oil to 3 parts gas and you should be just fine!

Answer 8

Piston rings are getting bad, or fuel mixture is wrong, or air/fuel adjustment on carb is not right

Answer 9

is it pree mix or or auto mix,
to much oil if pree mix.
exhaust might want a good cleen out,

Answer 10

It may be burning oil.