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Discussion Starter · #1 · (Edited)
Hello everyone! I will start by saying I am new here and completely stumped lol. I have looked everywhere and have not come up with a solution so i hope you guys can help me out.

I have a snowblower I am repairing for a friend and I cannot get it to fire up. The first time I tried to fire it up it backfired, so I adjusted the valves, checked that the key wasn't sheared and cleaned the flywheel of rust. It seems to me that it has way to much compression when pulling over so I checked and it has 140psi after three pulls. So i thought it must be the compression release has failed. I took it the cover off and inspected the cam and the compression release is intact but looks slightly wore, not enough that i would be concerned but correct me if I am wrong. I am unable to compare the height of the compression relief tab to know. push rods are good as well and it seems to move the valve properly when i turn it over. Could it be excess carbon buildup? I haven't had the head off yet but i am leaning that way.

Any help would be appreciated!
 

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As above, check for spark, then spray starting fluid in the carb, make sure it goes in the throat not somewhere inside a plastic housing.
 

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Has lots of spark and it would get fuel but it blows back out of the carb instead of sucking it in. Not sure on age. It's a model 20M314.
If the air is being pumped the wrong way, I would strongly suspect a valve issue on the intake side...
 
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Discussion Starter · #6 ·
Well I got it going and I am slightly ashamed. Valves were moving fine. Timing was perfect. Had fuel and spark. Still not sure why the motor wasn't getting gas in the cylinder. I took out the spark plug and dropped it, so I re gapped it and checked spark with it out. Seemed to spark good. But since I dropped it I replaced it with a new one. Sprayed brake clean in the intake and it fired right up! I let it run for a bit and seems fine now. Strange that even though the other plug wasn't firing properly before it was also dry. Thanks for your input everyone!
 

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I had an engine like that, fixed everything and it would not start, lots of spark and just popped and backfired a lot. I replaced the spark plug and it fired right up. Just had another machine that would not rpm off idle and replaced the plug and fixed it. $3 for me s worth a try.
 

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Discussion Starter · #8 ·
I had an engine like that, fixed everything and it would not start, lots of spark and just popped and backfired a lot. I replaced the spark plug and it fired right up. Just had another machine that would not rpm off idle and replaced the plug and fixed it. $3 for me s worth a try.
Very strange. The funny thing is this is the second motor I have repaired for this guy that had a spark issue. The first was an old Honda GC with points ignition. plug had no spark, put my inline spark tester in and it would light up like Christmas. tried a new plug and same thing. Ended up replacing the points and condenser. then I had spark on the plug. So I bought a spark tester that you can actually set the gap on. it produced enough volt to light the bulb but not jump the gap. Another lesson learned.
 
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