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Post by orangesoda123 on Aug 27, 2020 10:06:08 GMT -5
What does the plug look like? The replacement carb may have too big/too small of a main jet in it if you have the original carb you could try swapping MJ w/ the replacement if it fits. Then you said that it reved up fine with the belt off, does the clutch and rear drive faces spin easily/quietly? From what I could tell, they seem to spin just fine. I'm not sure how much resistance the clutch should have though. It wasn't overly easy to compress that spring.
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Post by GrumpyUnk on Aug 27, 2020 13:24:54 GMT -5
Have you checked that the black 'barrel' slide can move freely up and down? If it was binding in its range of motion, as the vacuum diaphragm moved it up to allow more airflow(and fuel via needle port0, it could hesitate, and cause a bog. It should move freely throughout its full range of motion. If it binds, figure out where, and correct that. Did you ever check the action of the accelerator pump? It is on the RR of the carb, with a pin that is moved by a lever when you open the throttle. The lever moves and pushes down on the pin, causing a squirt of fuel into the carb air inlet. That squirt covers up for the density difference between air and liquid fuel. Fuel will NOT move as quickly as air, so you get a lean spot when the air starts whizzing as you open the throttle, but the fuel is lollygagging around in the carb passages for a while, result, lean mix and bog/surge. tom
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Post by wiscootsin on Aug 27, 2020 20:15:51 GMT -5
Move the needle all the way down (clip on top, lean) and see if there is any difference. If not do the opposite (rich) and see if you get any improvement. Needle height could be it. My guess would be it's too low and not getting enough fuel (if needle height is the problem). How well does it operate at half throttle, etc? I might also suggest that if you haven't cleaned out the fuel tank and replaced the petcock, the petcock could be restricted. If it sat a long time I wouldn't leave the petcock on. (I wasted 5 hours trying to troubleshoot a weird bog issue on a 2005 china gy6 and it ended up being the petcock having plastic confetti string stuck in it, restricting gas flow at max throttle...)
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df41590
Scoot Enthusiast
Posts: 285
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Post by df41590 on Aug 27, 2020 21:04:09 GMT -5
What does the plug look like? The replacement carb may have too big/too small of a main jet in it if you have the original carb you could try swapping MJ w/ the replacement if it fits. Then you said that it reved up fine with the belt off, does the clutch and rear drive faces spin easily/quietly? I'll try and get the plug out today. The old carb MAY still be at the bottom of the garbage bin. It was in pretty bad shape. Bad shape like how? The spark plug appearance would be helpful for us guys, so we know whether it is running rich or running lean. A piece of advice be really careful of what you throw away, old parts can come in handy at some point down the road.
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Post by orangesoda123 on Aug 28, 2020 9:03:06 GMT -5
Have you checked that the black 'barrel' slide can move freely up and down? If it was binding in its range of motion, as the vacuum diaphragm moved it up to allow more airflow(and fuel via needle port0, it could hesitate, and cause a bog. It should move freely throughout its full range of motion. If it binds, figure out where, and correct that. Did you ever check the action of the accelerator pump? It is on the RR of the carb, with a pin that is moved by a lever when you open the throttle. The lever moves and pushes down on the pin, causing a squirt of fuel into the carb air inlet. That squirt covers up for the density difference between air and liquid fuel. Fuel will NOT move as quickly as air, so you get a lean spot when the air starts whizzing as you open the throttle, but the fuel is lollygagging around in the carb passages for a while, result, lean mix and bog/surge. tom This seems to move freely.
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Post by orangesoda123 on Aug 28, 2020 9:06:35 GMT -5
Move the needle all the way down (clip on top, lean) and see if there is any difference. If not do the opposite (rich) and see if you get any improvement. Needle height could be it. My guess would be it's too low and not getting enough fuel (if needle height is the problem). How well does it operate at half throttle, etc? I might also suggest that if you haven't cleaned out the fuel tank and replaced the petcock, the petcock could be restricted. If it sat a long time I wouldn't leave the petcock on. (I wasted 5 hours trying to troubleshoot a weird bog issue on a 2005 china gy6 and it ended up being the petcock having plastic confetti string stuck in it, restricting gas flow at max throttle...) I've messed with the needle height with not much luck. Still bogging. If I ease into it it bogs much less and can eventually get it up to speed. Maybe I'll try looking into this. Are you thinking I should just replace the whole petcock or is there a way to bypass?
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Post by orangesoda123 on Aug 28, 2020 9:09:30 GMT -5
I'll try and get the plug out today. The old carb MAY still be at the bottom of the garbage bin. It was in pretty bad shape. Bad shape like how? The spark plug appearance would be helpful for us guys, so we know whether it is running rich or running lean. A piece of advice be really careful of what you throw away, old parts can come in handy at some point down the road. It was incredibly gummed up. The float valve was actually stuck and broke when removing it. Looks like they were using gas with ethanol in it and let it sit for a long time. I'll see if I can get a pic of the spark plug. I just put an el cheapo in it the other day to eliminate the spark plug being the issue. The old NGK i pulled out indicated it was probably running a bit lean before. I did, however, find the old carb at the bottom of the garbage bin so I can try to swap jets too.
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df41590
Scoot Enthusiast
Posts: 285
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Post by df41590 on Aug 28, 2020 9:29:31 GMT -5
Bad shape like how? The spark plug appearance would be helpful for us guys, so we know whether it is running rich or running lean. A piece of advice be really careful of what you throw away, old parts can come in handy at some point down the road. It was incredibly gummed up. The float valve was actually stuck and broke when removing it. Looks like they were using gas with ethanol in it and let it sit for a long time. I'll see if I can get a pic of the spark plug. I just put an el cheapo in it the other day to eliminate the spark plug being the issue the other day. The old NGK i pulled out indicated it was probably running a bit lean. I did, however, find the old carb at the bottom of the garbage bin so I can try to swap jets too. Good chance the petcock is gummed up also, may also have blockage in the fuel line. You can try soaking the petcock in a gas/seafoam mix or you can try a DIY ultrasonic cleaner like this www.youtube.com/watch?v=R1DtY2VwSyY, clean out the fuel tank, and replace the fuel line. If you have a bottle with a nipple tip that'll fit into the fuel line you can use this temporarily to gravity feed fuel to the carb just make sure there is a filter before the carb, and you have a vent hole in the bottle so it doesn't create a vacuum in the bottle and starve of fuel.
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Post by orangesoda123 on Aug 28, 2020 10:28:00 GMT -5
Plug Image (May have got a little overzealous with the anti-seize)
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Post by orangesoda123 on Aug 28, 2020 10:29:12 GMT -5
It was incredibly gummed up. The float valve was actually stuck and broke when removing it. Looks like they were using gas with ethanol in it and let it sit for a long time. I'll see if I can get a pic of the spark plug. I just put an el cheapo in it the other day to eliminate the spark plug being the issue the other day. The old NGK i pulled out indicated it was probably running a bit lean. I did, however, find the old carb at the bottom of the garbage bin so I can try to swap jets too. Good chance the petcock is gummed up also, may also have blockage in the fuel line. You can try soaking the petcock in a gas/seafoam mix or you can try a DIY ultrasonic cleaner like this www.youtube.com/watch?v=R1DtY2VwSyY, clean out the fuel tank, and replace the fuel line. If you have a bottle with a nipple tip that'll fit into the fuel line you can use this temporarily to gravity feed fuel to the carb just make sure there is a filter before the carb, and you have a vent hole in the bottle so it doesn't create a vacuum in the bottle and starve of fuel. I do have a bottle like that I can use. I'll attempt to do this today.
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df41590
Scoot Enthusiast
Posts: 285
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Post by df41590 on Aug 28, 2020 10:40:01 GMT -5
Plug Image (May have got a little overzealous with the anti-seize) The plug says your running rich. I'd make sure the hole in the main jet from the old carb is clear and throw that in the new carb.
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Post by orangesoda123 on Aug 28, 2020 10:51:24 GMT -5
Plug Image (May have got a little overzealous with the anti-seize) The plug says your running rich. I'd make sure the hole in the main jet from the old carb is clear and throw that in the new carb. The main jet is soaking now. I'll try the gas thing since thats super easy to do and then i'll switch jets later. Thanks so much everyone for the advice!
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Post by tortoise2 on Aug 28, 2020 11:34:52 GMT -5
Microwave technique is another cleaning option.
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Post by orangesoda123 on Aug 28, 2020 11:54:48 GMT -5
Microwave technique is another cleaning option. Never tried this before...Cant say i like the idea of metal in the microwave :-)
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Post by orangesoda123 on Aug 28, 2020 12:26:58 GMT -5
Well, I don't think its a fuel delivery problem from the petcock. I tried to hook up a bottle to gravity feed but it wouldn't run at all doing that. I hooked the fuel line back up to the petcock and it fired back up . I unhooked the fuel line but left the vacuum hose attached and it flows from the petcock with no issue.
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