Mid 90s Craftsman 5/22 engine problem. - Snowblower Forum : Snow Blower Forums
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post #1 of 21 Old 01-20-2019, 03:49 PM Thread Starter
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Mid 90s Craftsman 5/22 engine problem.

I've got a problem that I haven't been able to troubleshoot. I picked up a 5/22 that had a starting problem. It looks like it's the original SnowKing engine, and it doesn't look abused or even like it was used much. You could see that it was consistently overprimed by the gas stains. I replaced the carburetor, fuel line, primer line, added a fuel shutoff and a screen fuel filter. Fresh gas. Checked the linkages and the governor spring. Plug looks new. it's still hard starting, you need to use the electric start and it take 5+ tries to get it to stay running. Using the pull start is out of the question. Even after letting it warm up for 5 minutes or so, it will stall out when you engage the auger. It does run at around 3600 rpm without a load. Not sure what else to check since the entire fuel system is new. Cracking the fuel cap doesn't seem to help. I would like to get it so I can at least use it, and then get it to start manually.

Anybody see anything like this?
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post #2 of 21 Old 01-20-2019, 03:57 PM
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Compression would be a good next step . . .
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post #3 of 21 Old 01-20-2019, 04:21 PM
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What "tadawson" said.

Also with the "new" carb did you adjust it after is was running.
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post #4 of 21 Old 01-20-2019, 04:26 PM Thread Starter
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Thanks. I'll have to get a compression gauge to check that out. Any other things to check?
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post #5 of 21 Old 01-20-2019, 04:28 PM Thread Starter
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It's one of those non adjustable carbs.
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post #6 of 21 Old 01-20-2019, 05:05 PM
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If it stalls taking load, and all else is good, you are too lean on the main jet.
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post #7 of 21 Old 01-20-2019, 06:52 PM Thread Starter
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Thanks, I just ordered a compression gauge. From what I looked up it should be around 80, but anything over 60 is acceptable? And if it's low, it's usually because the exhaust valve tightened up?
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post #8 of 21 Old 01-20-2019, 06:57 PM
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Quote:
Originally Posted by Tom J View Post
Thanks, I just ordered a compression gauge. From what I looked up it should be around 80, but anything over 60 is acceptable? And if it's low, it's usually because the exhaust valve tightened up?
...or bad head gasket and/or loose head-bolts; You'd usually you can see some sludge at the head/block interface.

it's definitely a qualitative measurement. Ballpark targets I'd say 60 or higher on the recoil and 90 or above with electric start.


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post #9 of 21 Old 01-20-2019, 08:15 PM
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In addition to what Classic cat suggested check the valve clearances. Also get a new spark plug, even if you think it looks good.

It may be running a bit lean. When you run it at night does the muffler turn reddish.? Good sign it is running too lean or the exhaust valve clearance is not enough.
If too lean you could open the main jet a few thousandths of an inch with a welding tip cleaner. Or a micro drill if you can measure where you are at now. You don't want to open it up too much. Be conservative.

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post #10 of 21 Old 01-21-2019, 03:01 AM
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Quote:
Originally Posted by Tom J View Post
You could see that it was consistently overprimed by the gas stains.

Gas stains? Or a discolored primer bulb? Just wondering cuz I've spilled plenty of gas over the yrs and never had to contend with gas stains. As regards the issue with your Craftsman, I'm voting with the others here in that you're dealing with a possible compression problem.

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