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Old 05-01-2010, 12:45 AM
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Differential Differential is offline
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snapper backfire

I'm running a snapper 21 with the wisconsin robin 5hp engine. Sometimes when I stop the mower to empty the bag, it will backfire when I restart the mower.

It only backfires once, on the first pull, after i've re-started it. The mower has been maintained impeccably, and runs really well. No smoke, runs smoothly, plenty of power, etc...

Anyone know why I get that backfire after a quick break to empty bag?
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  #2  
Old 05-01-2010, 10:04 PM
topsites topsites is offline
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Can you leave it idling while you empty the bag?
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Old 05-02-2010, 10:07 AM
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With this model, there's now way to safely unload bag with engine idling.
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Old 05-02-2010, 09:30 PM
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STIHL GUY STIHL GUY is offline
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try to slow down the RPMs and let it cool down a bit before turning it off. dont go from full RPMs to stop
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Old 05-07-2010, 06:24 PM
Shasta Lake Landscaping Shasta Lake Landscaping is offline
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I just got one of these mowers today out of a pile of junk that was to be hauled away at a clients house. After I change the oil and do regular maintenance I'll run it and see if mine does the same.
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Old 05-11-2010, 11:05 PM
Keitha Keitha is offline
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The back fire is the fuel mix hitting a hot spot someplace, could be a piece of carbon in the head or exhaust.
I agree try to let it cool down a bit before shut down.
Fix may involve cleaning piston top, cylinder head and muffler.

Keith
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Old 05-11-2010, 11:41 PM
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Differential Differential is offline
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I've been trying to let it idle down for a few seconds before i shut it off to empty the bag. I haven't had a backfire since I started doing this.
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Old 05-13-2010, 12:53 AM
Tony O Tony O is offline
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Robins 5hp

Differential,
I have the same mower set-up you do and the same identical problem you just described. I purchased mine used from CL, hadn't been used commercially. I had this problem since day one but other then that it's been
a great mower smooth and plenty of power. I just acquired a Tru-cut rotary mower and I'm thinking of swapping out the Honda 5hp for the Wisconsin Robins.
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Old 05-13-2010, 01:33 AM
Shasta Lake Landscaping Shasta Lake Landscaping is offline
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Mine does not backfire, although I did decarbonize the cylinder head when I did the other maintenance things. Where can I get a manual for the engine? I found the snapper manual online but couldn't find the Wisconsin manuals.
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Old 05-13-2010, 01:46 AM
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I got these from Subaru Robin...
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File Type: pdf EH18V,RAI,396S122.pdf (2.71 MB, 11 views)
File Type: pdf EH18V-EP1254A-701.pdf (953.7 KB, 4 views)
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