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  #21  
Old 09-18-2018, 08:47 AM
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ol'George ol'George is online now
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IIRR
Fuel sol's, came about to comply with emissions.
When the engine ignition is terminated, the rundown allows a bit of fuel/air through the engine, producing unwanted emissions.
Every tiny bit gets measured and it is a way to comply.
An added benefit is a reduction in dieseling and ignition of unused fuel in the exhaust system.

FWIW If a person is experiencing a back fire or "pop" in the exhaust after shutting off the ignition, sometimes it is caused by introduction of air into the exhaust system.
Example: loose clamps, gaps between pipes/mufflers, or deteriorating system
(rust out)
A good exhaust system helps eliminate that.
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  #22  
Old 09-18-2018, 09:13 AM
Steve62 Steve62 is offline
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All good info from everyone !

After running and mowing a couple hours in 90* heat, I shut down and for the first time since I brought it home there was no backfire or dieseling.

Now I suppose some of that may have possibly been caused by the old carb and the fact that I found the PO had torn a section of gasket off and not replaced with a new one between the top of the carb and the air cleaner plate. Although I doubt that would make a differnce.

So I agree with you Todd, why not keep the Fuel Solenoid. I know they run without it but I really hated the backfires, etc.

I'm so happy with how great it runs now with the new carb and gaskets !! Definitely MUCH smoother and more power.

Note that I also ran all new fuel line, a new large fuel filter and added an electric fuel pump. I'm sure the mechanical pump was failing as I found bits of rubber in the fuel filter between the pump and carb. I of course had a filter before the pump as usual also.
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  #23  
Old 09-18-2018, 10:36 AM
Steve62 Steve62 is offline
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I have another question, as you know, the air cleaner base plate has 4 triangular openings. 2 of these line up with the blower ducts and the other 2 take air in from above the engine.

Seems it would be better to close off the 2 over the engine and just intake relatively cooler, cleaner air from the blower.

Anyone done this ? Any thoughts ?
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  #24  
Old 09-18-2018, 01:35 PM
J-Mech J-Mech is offline
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Quote:
Originally Posted by Steve62 View Post
I have another question, as you know, the air cleaner base plate has 4 triangular openings. 2 of these line up with the blower ducts and the other 2 take air in from above the engine.

Seems it would be better to close off the 2 over the engine and just intake relatively cooler, cleaner air from the blower.

Anyone done this ? Any thoughts ?
The purpose of the holes above the engine is to let out the excess air, and blow out extra dirt, from the filter housing. If you plug them off, you will create a problem. They need to be there. The fan pushes more air into the filter housing than the engine can use.... for good reason.
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  #25  
Old 09-18-2018, 01:47 PM
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Ahh !! good points ! I didn't think of it that way. And, might over pressure and cause problems with the carb.

Great info, thank you ! I'm glad I asked first.
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  #26  
Old 09-18-2018, 02:04 PM
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I want to add, before anyone goes thinking it, that you can't "supercharge" the engine with the cooling fan. Yes, there is a very low amount of positive air pressure in the blower housing, plugging the holes will divert the air to the engine cooling. Basically, it will just stop flushing the excess dirt from the filter housing. You'll take the air filter cover off and find it packed with grass/leaves and debris. No, it won't "force feed" the carb.... very much. It may throw the carb adjustment off, but no more than if you tune it without an air filter, then put the filter on.
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  #27  
Old 09-19-2018, 07:39 AM
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Well maybe we can add that aspect of 'supercharging" along with the Oil Pump idea to a K series engine and have a real grass cutting machine!!
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  #28  
Old 09-19-2018, 08:49 AM
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Well maybe we can add that aspect of 'supercharging" along with the Oil Pump idea to a K series engine and have a real grass cutting machine!!
Lol. Maybe the charge air would add enough power to drive the oil pump.
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  #29  
Old 09-19-2018, 08:49 AM
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Quote:
Originally Posted by Leadslingingdaddy View Post
Well maybe we can add that aspect of 'supercharging" along with the Oil Pump idea to a K series engine and have a real grass cutting machine!!
That’s an outstanding idea
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  #30  
Old 09-19-2018, 10:11 AM
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Every once in a while I come up with a good idea.... : -)
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