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Post by lain on Jun 25, 2015 18:51:37 GMT -5
So lately the past few days when I start the scoot after sitting for a while till its cold it will make a popping noise when starting, usually a couple pops then starts right up just fine. Then when warm it does not pop on starts. Runs fine, no notice in performance loss or anything else funny. Not sure how to go about tackling this weird issue.
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Post by ricardoguitars on Jun 25, 2015 19:45:05 GMT -5
Where is the popping noise coming from? exhaust, carb, piston, CVT?
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Post by geh3333 on Jun 25, 2015 20:08:20 GMT -5
So lately the past few days when I start the scoot after sitting for a while till its cold it will make a popping noise when starting, usually a couple pops then starts right up just fine. Then when warm it does not pop on starts. Runs fine, no notice in performance loss or anything else funny. Not sure how to go about tackling this weird issue. So its popping as its turning over ? Or after it starts ? Anyway you can take video of it ? I'm going to say you are running lean . you could be sucking in air somewhere causing this issue. I had a vacuum leak cause the exact same issue . on cold startups the engine would pop or backfire. But after warmup the issue stops. It would startup just fine. |
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Post by lain on Jun 26, 2015 13:46:28 GMT -5
Where is the popping noise coming from? exhaust, carb, piston, CVT? On startup before it fires up it pops. It sounds to me like it may be coming from below like around the exhaust area, but other people say it sounds like it comes from the intake. I will try to remember to take a vid but it only happens maybe once a day since I have been riding so often lately I haven't really been starting cold except the first start of the day. |
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Post by lain on Jun 26, 2015 13:49:21 GMT -5
So lately the past few days when I start the scoot after sitting for a while till its cold it will make a popping noise when starting, usually a couple pops then starts right up just fine. Then when warm it does not pop on starts. Runs fine, no notice in performance loss or anything else funny. Not sure how to go about tackling this weird issue. So its popping as its turning over ? Or after it starts ? Anyway you can take video of it ? I'm going to say you are running lean . you could be sucking in air somewhere causing this issue. I had a vacuum leak cause the exact same issue . on cold startups the engine would pop or backfire. But after warmup the issue stops. It would startup just fine. It pops as it's turning over yes, but stops as soon as the engine fires up properly. Usually only pops maybe once or twice on cold startup. It goes popop like it sounds like those tiny firecrackers at chinese new year parades. After the pops, without lifting my finger off the button, it starts right up just fine, all of this in less than 2 seconds I believe. Also it does not reoccur if I immediately kill the engine after start. |
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Post by toddmaples on Jun 26, 2015 13:59:41 GMT -5
So its popping as its turning over ? Or after it starts ? Anyway you can take video of it ? I'm going to say you are running lean . you could be sucking in air somewhere causing this issue. I had a vacuum leak cause the exact same issue . on cold startups the engine would pop or backfire. But after warmup the issue stops. It would startup just fine. It pops as it's turning over yes, but stops as soon as the engine fires up properly. Usually only pops maybe once or twice on cold startup. It goes popop like it sounds like those tiny firecrackers at chinese new year parades. After the pops, without lifting my finger off the button, it starts right up just fine, all of this in less than 2 seconds I believe. Also it does not reoccur if I immediately kill the engine after start. Are you cracking the throttle while cranking? |
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Post by ricardoguitars on Jun 26, 2015 15:33:03 GMT -5
Where is the popping noise coming from? exhaust, carb, piston, CVT? On startup before it fires up it pops. It sounds to me like it may be coming from below like around the exhaust area, but other people say it sounds like it comes from the intake. I will try to remember to take a vid but it only happens maybe once a day since I have been riding so often lately I haven't really been starting cold except the first start of the day. I have a theory, It could be a vacuum issue like geh said, normally when the scoot is off there is not vacuum generated so the carb doesn't suck gas and fuel stays still in the fuel lines, if there is a leak somewhere on the fuel or vacuum lines, it can provoke fuel leaks inside the engine when the scoot is off, provoking a backfire on startup when enough fuel is accumulated inside the engine (usually when the scoot has been off for a few hours, so it is cold). |
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Post by steve on Jun 26, 2015 16:22:50 GMT -5
That's a lean condition. You probably have a vacuum leak somewhere. You can use a can of WD-40, and start spraying your intake and hoses while it's running. It will bog when you spray the leaky area.
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Post by geh3333 on Jun 26, 2015 17:48:12 GMT -5
That's a lean condition. You probably have a vacuum leak somewhere. You can use a can of WD-40, and start spraying your intake and hoses while it's running. It will bog when you spray the leaky area. Also a verynlean condition could cause unburned fuel to build up in the exhaust , so at startup u get the popping or backfire. |
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