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#1
02-11-2018, 09:32 PM
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Troubleshooting a 125 - Cutting out and dying - No load
Hello,
Today, before any serious use, our (new to us) 125 started to lose power and die after idling for a while. (Engine ran fine yesterday) I was able to get it started again three times (but only with choke until firing - even though engine was warm) and from high RPM it would run for a minute and then fall off and die. The last time the RPM was surging (briefly falling off) before again falling off and dying. I have not had a chance to check the strength of the spark as it was sitting out in the open and it had started to come down. Having not worked on troubleshooting ignition problems for about thirty years, I thought I'd again reach out to the pros. My hunch is that the spark is weak and maybe the coil is going ? Spark lead ? The spark plug lead looks really tired and the coil does not look to be from this millennium. Not at all impressed with the way the lead connects with the plug and played with it a bit. It's all on the list. - But the previous owner said he'd recently changed the plug, and did points and condenser regularly (it had new points 15 hrs ago now). The plug is quite black today . . . The only other thing to mention is that yesterday, again, the choke cable had frozen so I gave it some WD40 at both ends. Any chance some might have crept into the carb through the choke shaft to cause a problem? Otherwise, the engine, when running, sounds great ! Thanks, GaryC - who has been known to shovel really long driveways, like today. 
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