Carburetor for a 150cc znen joker clone?

Shadowfire · 07-17-2016, 12:07 AM

Ethanol shouldn't be a problem in any gas powered device that's been out for more than 2 or 3 years. Every manufacturer that sells in the USA knows about it and what they need to do for it not to be a problem. Even the Chinese scoots are now using DOT-approved fuel lines.

What IS going to be a problem, though, is moisture in the fuel. If the bike sits for a long time, ESPECIALLY if its kept outside, moisture gets into the fuel. This causes the fuel to thicken/goop, or "cottage cheese"/"varnish". When it happens inside the carburetor, the varnish WILL narrow or completely plug up carburetor jets and passages. If left alone for years this way, it will actually damage/eat away the brass parts (jets, passage sleeves), and at that point a new carburetor will be the only fix, since you can't unscrew a physically damaged secondary jet aerator or passage sleeving to put in a new one.

I've seen sources that say that varnishing is actually due to the additives in gas, not ethanol. I'd tend to believe that, because its well known by the old timers about how bad fuel storage times are compared to years gone by. As far as I'm concerned, it doesn't matter what the actual cause is, just make sure you don't let the bike sit with a carburetor full of gas for more than a few weeks.

As for the OP, if they ultrasonically cleaned it and it still isn't working, there's really no other option than to replace the carburetor. They tried the cheap fix, but the carburetor was beyond repair. As to whether or not to have the shop do it, that depends on your skill with a wrench and your tolerance for tinkering. If you have the shop do it, they are also on the hook for making sure that the carburetor is tuned properly. If you do it, then it becomes your problem to make sure that the air/fuel adjustments are correct for your bike.

07-17-2016, 12:07 AM	#6
Shadowfire Join Date: Feb 2015 Posts: 121	Ethanol shouldn't be a problem in any gas powered device that's been out for more than 2 or 3 years. Every manufacturer that sells in the USA knows about it and what they need to do for it not to be a problem. Even the Chinese scoots are now using DOT-approved fuel lines. What IS going to be a problem, though, is moisture in the fuel. If the bike sits for a long time, ESPECIALLY if its kept outside, moisture gets into the fuel. This causes the fuel to thicken/goop, or "cottage cheese"/"varnish". When it happens inside the carburetor, the varnish WILL narrow or completely plug up carburetor jets and passages. If left alone for years this way, it will actually damage/eat away the brass parts (jets, passage sleeves), and at that point a new carburetor will be the only fix, since you can't unscrew a physically damaged secondary jet aerator or passage sleeving to put in a new one. I've seen sources that say that varnishing is actually due to the additives in gas, not ethanol. I'd tend to believe that, because its well known by the old timers about how bad fuel storage times are compared to years gone by. As far as I'm concerned, it doesn't matter what the actual cause is, just make sure you don't let the bike sit with a carburetor full of gas for more than a few weeks. As for the OP, if they ultrasonically cleaned it and it still isn't working, there's really no other option than to replace the carburetor. They tried the cheap fix, but the carburetor was beyond repair. As to whether or not to have the shop do it, that depends on your skill with a wrench and your tolerance for tinkering. If you have the shop do it, they are also on the hook for making sure that the carburetor is tuned properly. If you do it, then it becomes your problem to make sure that the air/fuel adjustments are correct for your bike.
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