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Backfiring
by: tvnacman - Dec 30, 2014 11:50:25 GMT -5
Post by tvnacman on Dec 30, 2014 11:50:25 GMT -5
the gas will loosen the sludge .
the link does not link to the video .
John
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Backfiring
by: lain - Dec 30, 2014 11:54:26 GMT -5
Post by lain on Dec 30, 2014 11:54:26 GMT -5
the gas will loosen the sludge . the link does not link to the video . John Yes it does, the forum makes it so the part after /# is not a link, you have to copy the whole link. It's a link tot he video file, not a streamed video. I will upload to youtube though so it can be easier. |
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Backfiring
by: lain - Dec 30, 2014 12:07:43 GMT -5
Post by lain on Dec 30, 2014 12:07:43 GMT -5
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Post by alleyoop on Dec 30, 2014 13:22:30 GMT -5
Just remember backfiring is a LEAN condition, AND white smoke is gas not oil. If it is blueish it is oil.
So backfiring plus white smoke to much gas and since backfireing is a lean condition YOU HAVE A BAD AIR LEAK and I would bet it is where the pipe connects to the motor(head). And since that was broken before and if you have not fixed that and put in a new EXHAUST gasket that is where most likely the air leak is at. NOW if you do not fix it things will get worst for you because it will damage your exhaust valve then you will need a new valve and or new head and or new piston if the valve breaks and damages the piston.
So get it fixed otherwise it will cost you a of a lot more than a couple bucks now.
Alleyoop
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Backfiring
by: tvnacman - Dec 30, 2014 13:25:10 GMT -5
via mobile
Post by tvnacman on Dec 30, 2014 13:25:10 GMT -5
When I get back to my computer I can watch the video .
John
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Backfiring
by: lain - Dec 30, 2014 13:46:11 GMT -5
Post by lain on Dec 30, 2014 13:46:11 GMT -5
Just remember backfiring is a LEAN condition, AND white smoke is gas not oil. If it is blueish it is oil. So backfiring plus white smoke to much gas and since backfireing is a lean condition YOU HAVE A BAD AIR LEAK and I would bet it is where the pipe connects to the motor(head). And since that was broken before and if you have not fixed that and put in a new EXHAUST gasket that is where most likely the air leak is at. NOW if you do not fix it things will get worst for you because it will damage your exhaust valve then you will need a new valve and or new head and or new piston if the valve breaks and damages the piston. So get it fixed otherwise it will cost you a of a lot more than a couple bucks now. Alleyoop After changing the head, and everything the scoot still backfires. The backfires seem to be coming from the muffler into the engine and out the tailpipe at the same time. There is a decent amount of oil and gas buildup from when the scoot wasn't running well stuck in the muffler to the point where it seems much heavier than it was before. Also, it's spewing out TONS of white smoke for about the entire warmup, after it gets on the road it stops smoking. I am guessing this may be a cause or THE cause of the backfires, I think my piston rings may be letting out too much oil, since my engine seems to EAT OIL. I am also suspecting running rich due to too large main jet, but I have a jet set on the way. I did get new rings but the new ones had gaps that were already too large so I am sending them back and getting new ones. How do I remove the buildup so I can ride without the backfires? Brake cleaner? I already know about the torch method but I do not want to do that method because my muffler is already a bit messed up. Money is a problem otherwise I would have got myself a new muffler already. As I said, I replaced everything, except the exhaust pipe, it still backfires. I AM trying to figure out the cause, I think it is the buildup of wet oily/gas stuff on the inside of the muffler now because it does not come from inside the engine, the backfires come from the pipe. I can hear them int he pipe and it almost seizes the engine. |
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Backfiring
by: jerseyboy - Dec 30, 2014 15:16:27 GMT -5
Post by jerseyboy on Dec 30, 2014 15:16:27 GMT -5
Are you sure its timed correctly?
It wont backfire from oil and gas buildup in the exhaust,,there is air coming in from somewhere,,what about the carb and the ACV valve,,is it working correctly?
I agree with Alley about he exhaust also,,check and make sure its tight with two studs,new gasket,,make sure to tighten it down nice and snug equally on both nuts...I check my exhaust nuts every time I change my oil which is every 1000km..I know its over kill but I like clean oil in my motors:)
BTW-That video should be deleted from the net,,its a waste of server space IMO.
Much better ones out there to check out.
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Post by lain on Dec 30, 2014 16:08:24 GMT -5
Are you sure its timed correctly? It wont backfire from oil and gas buildup in the exhaust,,there is air coming in from somewhere,,what about the carb and the ACV valve,,is it working correctly? I agree with Alley about he exhaust also,,check and make sure its tight with two studs,new gasket,,make sure to tighten it down nice and snug equally on both nuts...I check my exhaust nuts every time I change my oil which is every 1000km..I know its over kill but I like clean oil in my motors:) BTW-That video should be deleted from the net,,its a waste of server space IMO. Much better ones out there to check out. The video above is me showing tvnacman that the cam is TDC as well as the flywheel because he said he wanted to see it. It isn't an instructional video. As you can see as well these things are what does the timing right? These are all setup properly, right? So the timing is correct? I poured carb cleaner into my muffler pipe from the end that connects to the engine, and nothing came out of the end of the muffler... What? I tried pouring some in the end to see if it would come out the other end that connects to the engine, it didn't. Is this because the catalytic converter converts it before it passes through? It still smells like carb cleaner, and I got my hands on a vacuum and blew air into it, and it came out the other end and wreaked like carb cleaner and made me dizzy. |
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Backfiring
by: lain - Dec 30, 2014 17:04:34 GMT -5
Post by lain on Dec 30, 2014 17:04:34 GMT -5
So I am thinking, it isn't the exhaust, it wasn't really clogged or anything surprisingly. And the new head with a new intake manifold and exhaust gasket didn't change the fact that it is backfiring.
It does seem like a rich condition, the plugs get fouled with wet oily smelling stuff, and it doesn't backfire on deceleration like a lean condition, rather it backfires almost randomly, less while at higher RPMs while on the road, more when at lower RPMs, and a lot when idling and warming up.
Is there a way to test to see if the carb is giving too much gas besides replacing it and the jets? Like maybe a way to slightly cut some of the fuel? I do not have a air/fuel screw on my carburetor. Or at least I think I don't, there IS a capped hole that is capped with brass, I heard there is a screw under there, but I don't know how to get to it. I tried with mydremel and it broke the bit.
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Backfiring
by: tvnacman - Dec 30, 2014 17:49:23 GMT -5
Post by tvnacman on Dec 30, 2014 17:49:23 GMT -5
lain I'm not picking at you , yes you showed me the timing marks . After you installed the cam and rockers did you check to see if the crank moved off the "T" mark ?
John
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Backfiring
by: lain - Dec 30, 2014 17:53:20 GMT -5
Post by lain on Dec 30, 2014 17:53:20 GMT -5
lain I'm not picking at you , yes you showed me the timing marks . After you installed the cam and rockers did you check to see if the crank moved off the "T" mark ? John I didn't say you were, I was merely pointing out to jersey that the video was for you and was for reference, not instruction. Yes, and I made sure the crank stayed still and at the T mark while doing everything by putting a rolled up usb wire in between the flywheel and the casing to prevent movement. |
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Backfiring
by: tvnacman - Dec 30, 2014 19:16:24 GMT -5
Post by tvnacman on Dec 30, 2014 19:16:24 GMT -5
do you have a timing light ?
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Backfiring
by: lain - Dec 30, 2014 19:23:20 GMT -5
Post by lain on Dec 30, 2014 19:23:20 GMT -5
do you have a timing light ? No |
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Backfiring
by: bashan - Dec 30, 2014 19:50:27 GMT -5
Post by bashan on Dec 30, 2014 19:50:27 GMT -5
White smoke is gas, dark smoke is oil. It's starts out smoking white but quits? I'd suspect it's way too rich and the auto-enricher sends it over the cliff. When the enricher shuts off it comes back down out of the stratosphere but is still too rich. Maybe I missed it but what is your jet now? Do you have a Uni or what? How did you set the A/F screw? It's true if your muffler is blocked it could cause problems. John is correct, gas is a solvent for oil and gas residue, it will dissolve a lot of the crap in there and you may be able to dump it out. Wet oily black plug is way too rich bro.
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Backfiring
by: bashan - Dec 30, 2014 20:07:13 GMT -5
Post by bashan on Dec 30, 2014 20:07:13 GMT -5
The top arrow points to a brass cap over the butterfly pivot. It is on every carb and shouldn't be messed with. The bottom arrow points to the A/F screw, if it is covered then you may want to drill into the cap and get to it. Be careful please, it's a little dicey.
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..BAD TO THE BONE..
