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Post by rock on Apr 30, 2015 21:51:11 GMT -5
Hey guys, I've been having even more problems with my scooter lately  and I need your guys' help again. The idle on my 150cc GY6 engine has been really crumby lately. I have the stock carb with a 103 main jet and the stock filter. Sometimes it starts right up and has a great idle. Then at times it will start up and sputter out if you get off the throttle. Other times, it will start out great and then after about the 5 mins (i assume after the enricher quits) the idle will get to insanely high RPMs. My best as to why this is happening is because the A/F mixture is too rich. Another problem I have been having is terrible fuel economy, I am only getting about 40 MPG out of this stock engine which is supposed to get about 80. Again, is this because the mixture is too rich? One other small thing is that I have been getting some popping in the muffler, I don't know what causes this, or how to stop it. Anything you guys have helps. The only bad sign that I have noticed throughout all of this is that the spark plug is slightly wet with oil upon inspection. I don't know why this is bad, I just know that it is. I honestly don't know why all of these problems are happening....the engine has less than 50 miles on it. I just want to ride so anything that you guys can suggest that might help me fix these issues is much appreciated. Thanks for letting me be a part of such a great community! |
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Post by lain on May 1, 2015 2:01:50 GMT -5
Kind of sounds like you are running too rich, or possibly need to clean the carb. What else can you tell us about the scooter? Did you change anything from stock?
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Post by rock on May 1, 2015 9:26:59 GMT -5
The scooter is completely stock. I have changed nothing and I suspect that nothing has changed due to riding given the fact that I have only about 37 miles on the engine. Stock carb stock air filter (no uni). I tried tuning the carb using alley's tuning guide with no luck
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Post by lain on May 1, 2015 10:22:32 GMT -5
When you say you tried tuning the carb with no luck, do you mean adjusting the mix or speed screws had no change at all, or just not helpful for the idle?
You keep mentioning "the engine" has low mileage, do you mean the entire scooter or was the engine replaced and you are now counting from replacement? Did you get this scoot new or used, and did you get it recently and has it been sitting around? Even a "new" scoot will need a cleaning if it was on the showroom floor for a very long time.
I knew someone who needed their carb cleaned because the shop owner did not run it enough and forgot he had put gas in it once to show it to a customer and it had been sitting on the showroom floor for over a year.
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Post by rock on May 2, 2015 9:05:56 GMT -5
I apologize for my vague information hahaha. The scooter itself has less than 50 miles on it. I got it from a neighbor who rode it home from the dealership and let it sit for a year.
As for the carb, I recently went through every jet with carb cleaner and did everything I could to get the rest of it clean. When I adjust the idle speed screw, it does change the RPMs but the idle still fluctuates a ton. As for the A/F screw, I started with it about two turns out and tried to tune. This did not change the idle RPMS nor did it stop backfire.
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Post by murkyapricot on May 2, 2015 12:07:06 GMT -5
Are you sure you are waiting until the enricher turns off before adjusting the a/f?
Also since it's new you may want to check the valve lashing
Also how does your spark plug look? That will give you the best read of how it's running
I'm almost thinking you are running a little lean
for the exhaust popping are you sure you arnt getting any exhaust leaks?
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Post by rock on May 2, 2015 16:32:47 GMT -5
I let it run for five minutes usually before adjusting the A/F mixture...although it should still change RPMS when it is being enriched
The spark plug is wet with oil, a shop told me that this could be because it was recently transported on a trailer
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Post by rock on May 2, 2015 16:33:34 GMT -5
I have no idea how to check for exhaus leaks
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Post by lain on May 3, 2015 1:19:13 GMT -5
What process did you use to clean the carb? Can you explain what you did? Did you completely disassemble the carb? Did you remove parts that could have been damaged by carb cleaner, like rubber and gaskets?
Is the main jet stock or different size than what it came with?
Why did you clean it in the first place?
Are you sure the plug is wet with oil, not gas? Got any pics of it?
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Post by rock on May 3, 2015 20:02:59 GMT -5
I cleaned the carb because the scooter was bogging out with throttle. I cleaned it using a small piece of wire brush and carb cleaner. I removed the parts that I felt needed cleaned (needle, spacers, main jet, idle jet). I did not spray cleaner near any of the diaphragms or seals. It seems as though the spark plug is just black now. It may have been gas on top of the 'fried' part that made it look like oil. I have a picture but I don't know how to post it.
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Post by rock on May 3, 2015 20:03:48 GMT -5
The main jet is stock and I did completely disassembled ( and reassembled ) the carb
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Post by rock on May 3, 2015 20:26:17 GMT -5
I see that the black dust covering it is carbon fouling and is due to an AF mixture that is too rich
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Post by lain on May 3, 2015 21:32:01 GMT -5
You used a wire brush on the jets? Jets are typically made of soft metal, if you use a wire brush on it you can potentially change the "size" of the jet unintentionally if you scrape too much. I personally use aluminum wire, just a strip of wire thats right, it's soft and thin and won't damage soft metals.
Did you completely dry and wipe all parts before putting them back in the carb? You said you cleaned spacers from your carb, but what spacers are you talking about?
It's honestly sounding like you need to go back and do the job correctly, meaning take it completely apart and clean it and let the cleaner sit for a few hours at least. Make sure to organize all the parts you take out. Do not scrape any part of the inside of the carb, at most use a tooth brush and a very slim and soft metal wire to do the work. If it still doesn't work after a proper cleaning I would replace it.
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Post by onewheeldrive on May 3, 2015 21:38:22 GMT -5
The main jet is stock and I did completely disassembled ( and reassembled ) the carb You need to check the number that is written on the main jet-- most have a number on it. I have yet to see a consistent stock jet in any of these Chinese scoots. It varies from carb to carb and scoot to scoot. It's quite possible that you have a jet that is too big. |
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Post by rock on May 4, 2015 7:31:37 GMT -5
It's a 103
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