Scooter Doc
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Post by richardthescooter2 on May 2, 2012 14:48:20 GMT -6
I have a mc-54-250b, just recently had trouble shutting off in warm weather, as soon as the fan kick on this scooter at speeds of 50+ would start jerking and then shut off, so I bought a cdi, which I thought fixed the problem. Today very warm today it starting all over again  at the time I was going to buy a ignition coil but I didn't. I guess now thats the next thing to buy. Today I notice when the fan is on my spark plug cap is hot, is that normal  Attachments:
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Post by Bashan on May 2, 2012 15:31:49 GMT -6
Spark plug caps get hot, that's normal. I had a coil do exactly what yours is doing. I'm pretty sure that's what it is and bad electricals often act up when they get hot. Get a coil and go from there if necessary. Rich
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Post by richardthescooter2 on May 2, 2012 16:25:44 GMT -6
Thanks Rich.
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Scooter Doc
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Post by richardthescooter2 on May 3, 2012 12:46:31 GMT -6
my odds are I need a ignition coil, but I did notice today going to work, fan on and the scoot starts that jerking, but today I back off the throddle and was able to regain,no stalling. Each time I could tell its coming, I would back off throddle and it seemed to work.
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Post by Bashan on May 4, 2012 7:19:50 GMT -6
You might have a bad fuel pump then. That doesn't explain the heat being a factor but who knows with these things. Check your vac supply line to the pump but short of swapping it out, just like the coil, there's no easy way to make sure. Rich
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Doc's Anything Goes
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Post by tvnacman on May 4, 2012 8:20:12 GMT -6
Sounds like its running lean. I agree with Rick check for vacate leaks.
Jphn
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Post by richardthescooter2 on May 8, 2012 12:07:35 GMT -6
I'll check that vacuum hoses and I'm going to order ignition coil anyway  I did notice today when cold idle good, it seems when its warmed up is when its runs rough just at idle You said it sound lean, but I'm 2 1/2 turns out and my needle jet clip is set on the highest being rich. |
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Clinician
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Post by nulldevice on Jun 14, 2012 16:04:32 GMT -6
Clarify the notch for us -- is the high notch the one towards the bottom of the needle or the one towards the top of the needle?
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Post by Alleyoop on Jun 14, 2012 16:33:50 GMT -6
Yep if you have the CLIP on the notch next to the END of the NEEDLE you are LEANING the mixture. If the CLIP is towards the POINTED end of the CLIP then you have RICHEN the mixture. Alleyoop  |
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Post by kz1000st on Jun 14, 2012 19:08:05 GMT -6
If it isn't the coil I would let the scooter get hot at a standstill and check the voltage across the battery when the fan kicks in. I know it sounds stupid to say the regulator ( or the fan motor ) but it sounds awfully funny that when the fan draws power that's when your troubles start.
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Post by richardthescooter2 on Jun 18, 2012 11:10:45 GMT -6
Just to clarify the notch, it on the last notch going toeard to point.
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at the time I was going to buy a ignition coil but I didn't. I guess now thats the next thing to buy. Today I notice when the fan is on my spark plug cap is hot, is that normal 
I did notice today when cold idle good, it seems when its warmed up is when its runs rough just at idle 
..BAD TO THE BONE..
