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1987 Honda Trx 250x won't run unless it's pull started.

6323 Views 6 Replies 3 Participants Last post by  TRX2fiveO, 
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I bought a 1987 Honda Trx 250x non running no spark or exhaust. I bought a new coil fixed spark, new exhaust now it won't start if I pull start it with another quad it starts right up in first gear then the second I unhook the chain it dies everytime, makes no sense to me I've pulled the carb clean it, chained oil, new plug, new coil, I was thinking possibly valves so I checked that as well noticed there is a metal piece that goes into the front valve and there is a cable that hooks to it that leads by the kick start is super lose I can pull it right out. Not sure where to go from here
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The cable you mentioned might be for an automatic compression release operated by the kickstarter. I am not familiar with the early 250x so I'm not sure. You can get a copy of the service manual for your bike HERE and fix or adjust that.

I'll take a guess on your ignition problem... but don't rely on me alone. The motor has to be kicked over at 430 RPMs or faster for it to start, so if the motor dies right away it might have a bad AC regulator or a bad harness plug connection preventing the alternator from working. Check and clean all of the harness plugs and any ground wire going to the frame. See the attached image for reference and initial ignition system troubleshooting steps.

Let us know how it goes and welcome to the forums!

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Brandon316 said:
While replacing a gasket on head noticed that the chain inside had rubbed on the top of the head gouging groves into it where the chain hd rubbed against the head. Could the timeing chain be too loose and messing it up?
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The timing chain has probably jumped over the upper sprocket by now, putting the valve timing out of time. You'll need to replace the chain & sprocket to get the motor to run if thats the case. Check the cam journals for excessive wear too, while you have the rocker cover off.

The service manual covers chain replacement well. Make sure you adjust valves and the decomp cable when you get done...

And have fun!
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