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weak spark
by: alleyoop - Apr 7, 2013 18:35:20 GMT -5
Post by alleyoop on Apr 7, 2013 18:35:20 GMT -5
Yea, the spark plug gaps depends a lot on how much voltage is reaching it. If you see you have a weak spark go down 1-2 on the gap, if it is getting real good voltage then you can gap them wider. Normally plug gaps for scoots range anywhere from 26-32, a good setting for most is 28.
Alleyoop
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weak spark
by: tvnacman - Apr 7, 2013 18:37:35 GMT -5
Post by tvnacman on Apr 7, 2013 18:37:35 GMT -5
what are the valve gaps ? John Stock gap is 0.025" don't go lower than 0.010", or it'll skip beats. I set mine up to 0.011-0.012", which is a LOT better for my 50cc. My EVO150 is less sensitive to the gap changes, but I still gapped it to 0.015" Edit: DUH! I was talking about spark plug gaps, instead of valve gaps... Sorry for that. Anyway, you got the info too. Did you think I don't know what the valve gaps should be ? double talking me again itistheride.boards.net/index.cgi?action=display&board=50ac&thread=748&page=1John |
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weak spark
by: jeffery5568 - Apr 7, 2013 19:25:59 GMT -5
Post by jeffery5568 on Apr 7, 2013 19:25:59 GMT -5
My valve clearance is good my carb is clean the only problem is weak spark, I have checked all grounds they are tight and clean. I can hold the plug wire and barely feel a shock.
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weak spark
by: tvnacman - Apr 7, 2013 19:29:11 GMT -5
Post by tvnacman on Apr 7, 2013 19:29:11 GMT -5
My valve clearance is good my carb is clean the only problem is weak spark, I have checked all grounds they are tight and clean. I can hold the plug wire and barely feel a shock. ya put your other hand on the engine while your checking it . it will feel like you got wolloped with a sledge hammer . John |
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weak spark
by: jeffery5568 - Apr 7, 2013 19:49:01 GMT -5
Post by jeffery5568 on Apr 7, 2013 19:49:01 GMT -5
I did I held the exhaust. Do you think the spark would be getting stronger with higher rpms?
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weak spark
by: tvnacman - Apr 7, 2013 20:05:36 GMT -5
Post by tvnacman on Apr 7, 2013 20:05:36 GMT -5
I did I held the exhaust. Do you think the spark would be getting stronger with higher rpms? shy of testing it not too sure I would like to say yes . John |
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weak spark
by: jeffery5568 - Apr 7, 2013 21:39:29 GMT -5
Post by jeffery5568 on Apr 7, 2013 21:39:29 GMT -5
My thinking is the cdi is powered by ac. And so are the head lights and they get brighter when its revved up so I think my spark gets stronger also when its revved. So when I crank on it the spark is week at low rpms. That's why it hard to crank.
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weak spark
by: alleyoop - Apr 7, 2013 21:45:01 GMT -5
Post by alleyoop on Apr 7, 2013 21:45:01 GMT -5
Well put a new coil on it, the CDI releases about 400 or so volts to the COIL then the coil builds that up to anywhere from 20000-40000 volts. It may be a weak coil and they are cheap enough.
Alleyoop
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weak spark
by: jeffery5568 - Apr 7, 2013 22:06:45 GMT -5
Post by jeffery5568 on Apr 7, 2013 22:06:45 GMT -5
Do you think I need both or just a coil?
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weak spark
by: woowilly - Apr 7, 2013 22:30:23 GMT -5
Post by woowilly on Apr 7, 2013 22:30:23 GMT -5
Make sure your engine to frame ground wire is connected. Mine's broke twice, which results in a weak spark. ( This should be a PDI item: replace that wire with one designed for high flexing usage. Wire with just a few large strands is used because it's cheaper...)
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weak spark
by: jeffery5568 - Apr 8, 2013 9:30:49 GMT -5
Post by jeffery5568 on Apr 8, 2013 9:30:49 GMT -5
Its connected I unhooked it to see if it made any difference.
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..BAD TO THE BONE..
