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Post by madcervantes on Mar 16, 2013 17:28:54 GMT -5
I recently had a problem with my scoot, and since I had previously had problems with my spark plug, I decided to take a look at it. It's working fine, but it's all black and oily. Not black and dry, like my last sparkplug when I burned it out. Just black and shiny, kind of slick.
I was reading somewhere this has to do with the oil to air mixture. Black and oily means that there's too much fuel in the mixture. Is this true, and if so how do I change that? Additionally, does not changing that mean I'll screw up the spark plug somehow? What are the effects of too much oil to air ratio?
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Post by beachbum on Mar 16, 2013 18:26:23 GMT -5
What kind of scooter is it? 2t or 4t?
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Post by gatekeeper on Mar 16, 2013 19:12:21 GMT -5
You're talking about the air/fuel mixture and yes it can be adjusted, unless your carb has a brass plug sealed over the adjustment screw. The newer scooters come plugged from the factory to satisfy the EPA. You can either drill the plug out or buy a replacement carb that has the screw exposed. Carbs are cheap, like $25. www.ebay.com/itm/330476352602?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649Sounds like you are running too rich. If running too rich, to adjust start the scooter and let it warm up good. Turn the screw in 1/4 turn increments starting clockwise. after each 1/4 turn wait 10 to 15 seconds to let the new setting catch up. If the RPM's go up do another 1/4 turn. If the RPM's do not increase, turn it 1/8 turn counterclockwise and you are set. If running too lean, to adjust start the scooter and let it warm up good. Turn the screw in 1/4 turn increments starting counterclockwise. after each 1/4 turn wait 10 to 15 seconds to let the new setting catch up. If the RPM's go up do another 1/4 turn. If the RPM's do not increase, turn it 1/8 turn clockwise and you are set. Attachments:
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Post by alleyoop on Mar 16, 2013 19:28:42 GMT -5
Lets back up a little here, If this is a 4 stroke OIL should not be on the plug. If it is a 2 Stroke then yes to much oil is being let in or to much oil was pre-mixed with the gas.
If 4 stroke and oil is on the plug then most likely you need new rings. When you first start it up does it smoke and after it warms up and gets hot does it stop? If so your valve stems are Leaking. If not then it is your rings.
Alleyoop
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Post by gatekeeper on Mar 16, 2013 19:58:29 GMT -5
He has a 4 stroke.
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Post by alleyoop on Mar 16, 2013 20:09:42 GMT -5
4 stroke and oil on plug not good, some re-build work is in order.
Alleyoop
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Post by madcervantes on Mar 16, 2013 22:35:43 GMT -5
Ah darn. I'll look into that and see what I can do. What is the difference between a problem with valves, and a problem with rings? What I mean is, what is the function of the valves versus the rings? Total newbie question I know.
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Post by beachbum on Mar 17, 2013 0:19:13 GMT -5
You should smell it and see blue smoke if its oil.
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Post by alleyoop on Mar 17, 2013 0:34:57 GMT -5
Yep, if you start it and see blue smoke coming out the muffler it is burning oil.
Take the plug out and take a picture of it so we can see if it is oil or just gas over sooty stuff. You should be able to tell whether oil is on the plug or it is just gas.
Alleyoop
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Post by JR on Mar 17, 2013 3:04:52 GMT -5
Ah darn. I'll look into that and see what I can do. What is the difference between a problem with valves, and a problem with rings? What I mean is, what is the function of the valves versus the rings? Total newbie question I know. The valves are in the head, normally there are two of them, one to let the air/fuel mixture into the combustion chamber, the other to let the burned hot gasses out into the exhaust. The rings are around the piston there can be three or four rings that keep the gasses from going around the piston to hold the compression in the combustion chamber. |
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Post by progenitor04 on Mar 17, 2013 9:42:19 GMT -5
blow by
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How far up the "float bowl drain valve" screw should the "float bowl drain vavle seal" be?
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Post by grrbrts on Sept 20, 2021 11:30:13 GMT -5
What is blow by?
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..BAD TO THE BONE..
rp gearoil