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PostPosted: Sun Jul 16, 2017 3:34 pm 
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Joined: Sat May 27, 2017 7:01 pm
Posts: 37
My FL250 was running all spiffy with a new motor (( Internal Combustion Engine ? )).

Then it started to lose power and died.

Now, it only backfires, mostly through the carb, but occasionally through the muffler. Arrggh.

I removed the muffler to start diagnosing what might be wrong. If I spray started fluid into the carb intake boot flames will shoot from the exhaust port. Pretty cool looking I might add. I'm using Lucas oil at 32:1 ratio. I have spark and have tried a new spark plug. Same effect.

Any suggestions?


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PostPosted: Sun Jul 16, 2017 6:35 pm 
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Joined: Tue Jan 17, 2012 3:19 am
Posts: 7698
Location: Hope, B.C Canada
Sounds like the timing is off. Did you shear the key on the flywheel ?? Was the flywheel even tightened in the first place ??


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PostPosted: Sun Jul 16, 2017 7:53 pm 
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Joined: Sat May 27, 2017 7:01 pm
Posts: 37
Haven't touched flywheel since I bought it about 12 years ago.

Probably a broken key. Is that visible or do I have to pull apart the driven pulley to check?


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PostPosted: Sun Jul 16, 2017 8:32 pm 
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Joined: Tue Jan 17, 2012 3:19 am
Posts: 7698
Location: Hope, B.C Canada
It would be a big job just to check it.
It's the woodruff key just above the crank in the pic.


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FL250 flywheel.png
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PostPosted: Sun Jul 16, 2017 10:50 pm 
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Joined: Sat May 27, 2017 7:01 pm
Posts: 37
Damn.

Looks like I'll need a flywheel puller and a clutch outer holder. Anything else?


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PostPosted: Sun Jul 16, 2017 11:00 pm 
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Joined: Tue Jan 17, 2012 3:19 am
Posts: 7698
Location: Hope, B.C Canada
Here is where you can get the puller: http://oddatv.com/product/honda-flywhee ... r100-xr80/
Good price too in my opinion.

You should be able to make the holder yourself if you have any kind of equipment around your shop.


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PostPosted: Mon Jul 17, 2017 8:23 am 
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Joined: Mon Oct 25, 2004 10:02 am
Posts: 2865
Location: East Peoria IL
I would not use starting fluid on a 2 cycle. Starting fluid will dissolve the oil and wash it off, not good for a premix 2 cycle Engine. If you need to use starting fluid you have problems that you need to fix first. Starting fluid will never solve or help those problems.

It should not be hard to check you key to see if it is sheared out of position. You can also setup a test light to indicate the timing. Clymer manual shows detailed instructions. Perhaps the points have shifted out of position.

Try unscrewing the spark boot from the wire and trim off about 1/4 ". Then screw boot back on.


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