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Weak spark
by: pretendentas22 - Sept 21, 2012 15:01:40 GMT -6
Post by pretendentas22 on Sept 21, 2012 15:01:40 GMT -6
I remember this one, but what I am thinking maybe my trigger started to delay the impulse. Thing is scoot worked before. Of course with misfires in certain intervals:)
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Weak spark
by: pretendentas22 - Sept 21, 2012 14:17:54 GMT -6
Post by pretendentas22 on Sept 21, 2012 14:17:54 GMT -6
put petrol not even single attempt to fire.
I am not sure is it important, but all my attempts I took off the head to check for crack. Pulled the valves and checked all head. No cracks. After I put the head back and cranked the engine it started. It worked while I rev, but just left on idle and it stalled. After again the same old story - not a single attempt to fire. It looks like this bike is just doomed.
Is it possible to check timing?
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Weak spark
by: pretendentas22 - Sept 20, 2012 11:03:43 GMT -6
Post by pretendentas22 on Sept 20, 2012 11:03:43 GMT -6
Yes, it was in camshaft area.
I tried to test compression by finger and it was blown out. Any more ideas?
Basically I have spark, compression, fuel, air, valves clearance is done and it still doesn't start.
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Weak spark
by: pretendentas22 - Sept 19, 2012 13:07:27 GMT -6
Post by pretendentas22 on Sept 19, 2012 13:07:27 GMT -6
Hi again,
Short update. I was checking valves' clearance when heard strange noise. When piston reaches TDC I can hear the sound which reminds air blows. Is it normal or I do have compression leakage?
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Weak spark
by: pretendentas22 - Sept 16, 2012 12:40:18 GMT -6
Post by pretendentas22 on Sept 16, 2012 12:40:18 GMT -6
Hi, thanks for explain. Yes you are right I did the clearance when the cam sprocket is aligned. I don't thing the problems are in clearance.
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Weak spark
by: pretendentas22 - Sept 16, 2012 11:10:03 GMT -6
Post by pretendentas22 on Sept 16, 2012 11:10:03 GMT -6
Hi, what do you mean get the lobe off? Do I need to take the cam sprocket away? My scooter has around 29000 and just recheck the clearance and it is 0.1.
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Weak spark
by: pretendentas22 - Sept 15, 2012 13:40:01 GMT -6
Post by pretendentas22 on Sept 15, 2012 13:40:01 GMT -6
Yes, it ran ok on high rev and didn't like idle. Carb is checked and cleaned, mixture is set 2.5 turn. Fuel gets into engine as I can smell it and spark plug is wet. Problem is I get spark but it doesn't look solid and thick. I measured stator volts, 37 AC, then I tested resistance. Charging coil gives 300 ohms, trigger 150 ohms. I am out of ideas.
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Weak spark
by: pretendentas22 - Sept 15, 2012 3:59:30 GMT -6
Post by pretendentas22 on Sept 15, 2012 3:59:30 GMT -6
Hi again,
I just readjusted clearance, made 0.1 mm. No change, still doesn't want to start. Any ideas?
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Weak spark
by: pretendentas22 - Sept 13, 2012 18:24:02 GMT -6
Post by pretendentas22 on Sept 13, 2012 18:24:02 GMT -6
Problem is my cam sprocket doesn't align at TDC. When cam sprocket is aligned piston is just about to reach TDC. I do my clearance when sprocket is aligned. The gap I set is 0.08 Did I miss something?
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Post by pretendentas22 on Sept 13, 2012 16:07:58 GMT -6
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Weak spark
by: pretendentas22 - Sept 13, 2012 15:37:43 GMT -6
Post by pretendentas22 on Sept 13, 2012 15:37:43 GMT -6
Thanks,
Is it possible the valves constantly stretches and stays stretched? Thing is I adjusted them three times within 200 miles and now it will be forth.
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Weak spark
by: pretendentas22 - Sept 13, 2012 14:20:49 GMT -6
Post by pretendentas22 on Sept 13, 2012 14:20:49 GMT -6
OK, I will check valves clearance. What about stator, do I need to replace it?
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Weak spark
by: pretendentas22 - Sept 13, 2012 13:41:58 GMT -6
Post by pretendentas22 on Sept 13, 2012 13:41:58 GMT -6
Hello All, I do have problem with weak spark on my GY6 125cc. I tested alternator which gives 37 AC volts, which is below recommended. Then I tested resistance. Charging coil gives 300 ohms, trigger 150. Both are in standard value. My question would be: is it possible to have correct resistance and the charge below standard value at the same time? Plus, week ago I was able to start it just it didn't work on idle, but no problems on high rev. I was able to ride miles as long as I don't let it stall on the idle. Now it even doesn't start, just burps and nothing  |
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Post by pretendentas22 on Sept 9, 2012 23:37:49 GMT -6
Hi again, well I moved one tooth over as was advised and unfortunately no change. Then I decided to check electric side and found my spark is very weak. Does anyone knows how to check CDI unit and other electric parts? I check alternator charging volts and it is 14.1, which is correct.
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Post by pretendentas22 on Sept 5, 2012 3:10:06 GMT -6
Thanks for explaining it. I didn¡¦t have scooter before and it is difficult to judge does it goes ok. I can do 50 mph quite easy but this is top speed. Once I did 55 from the hillƒº. The blow is harder on top speed, in the beginning I thought something is loose and just bangs into bottom.
On the idle it just ¡§blows¡¨, ¡§blows¡¨, ¡§blows¡¨ and stalls, unless I increase idle to 2500 rpm. If I let to stall, it is difficult to start engine again.
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