Rough running 24" MTD 310-600A Snowblower - Snowblower Forum : Snow Blower Forums
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post #1 of 17 Old 02-04-2015, 01:01 PM Thread Starter
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Rough running 24" MTD 310-600A Snowblower

I bought a 24" MTD 310-600A back in February, 1982. 33 Michigan winters at two houses with large drives have been rough on the beast but it has served us well; I have done quite a bit of maintenance over the years to keep it running but have been pleased, overall.

The last few years it has been running rough - I had the carb rebuilt and it did not seem to be helping. New spark plug and clean gas with Seafoam does not seem to help either. It takes about 3-4 minutes of the electric start to get it going, it surges while running and occasionally loses power or stalls. While it cleared the last 16" snowfall, it was difficult.

Engine is a 5 HP Snow King HS40 or HS50 (per the original manual, can't find info on engine).

I'm thinking that I should just replace the carb for $30 from Amazon (and add a filter, anyone have a link to one they like for this size engine?). While I am at it, any other suggestions of what I should consider?

Suggestions very welcome. I'm about to go fire it up in a few minutes and, while I expect to clear the drive, I know the experience will be annoying.
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post #2 of 17 Old 02-04-2015, 01:59 PM
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If your engine is a single shaft engine that for $100 stick one of those Harbor Freight Predator 212cc engines on there. If yours has the extended camshaft for the drive wheels then that will not work so well.

If you go with the change the carb method be sure to change the fuel line too. 1/4" ID available at any auto parts store for $1.00 - $1.50 per foot.

Please direct all snow blower questions to the forums and not to me with PMs.
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post #3 of 17 Old 02-04-2015, 02:09 PM
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You don't want an air filter on a snow blower. No dust to worry about, but they can get wet and freeze.
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post #4 of 17 Old 02-04-2015, 03:07 PM Thread Starter
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Sorry, I meant fuel filter. This motor drives the wheels as well.
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post #5 of 17 Old 02-04-2015, 06:44 PM
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New carb may help, but some of your symptoms suggest the valves aren't seating properly. This will make for a hard starting engine that doesn't produce the same power. If your comfortable doing a valve job your problems can be solved in an afternoon for the cost of a gasket.
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post #6 of 17 Old 02-04-2015, 06:54 PM
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Engine part number is at the top of the fan shroud. Under the electric starter button if you have one. Stamped in.
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post #7 of 17 Old 02-05-2015, 10:04 AM
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Check the compression on the engine. If it's good, a new carb might be the ticket. If not, you'll have to deal with exhaust valve clearance. BTDT recently, with the help and guidance of the fine folks on this forum.

Craftsman 5/22 with impeller mod & poly skids,
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post #8 of 17 Old 07-28-2015, 03:58 PM Thread Starter
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Looks like I need to do the valve job. Can I get a pointer to what is involved? I'm comfortable with mechanical repairs but not experienced with small engines.
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post #9 of 17 Old 07-28-2015, 04:15 PM
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Garage
this should get you started

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post #10 of 17 Old 07-28-2015, 09:06 PM
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+1 on the re-power

The original engine has earned its keep.

1989 John Deere 1032
1979 Toro 5/24 38040 (now a 6.5)
1978 Ariens S16H Tractor & Plow
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