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Old 07-16-2019, 12:23 PM   #1
Sandy
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Likely an Old Question, please bear with me


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Can the back plate on a gas engine be rotated 180deg to put the carb arms at a more favorable position?
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Old 07-16-2019, 12:30 PM   #2
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Re: Likely an Old Question, please bear with me

depends on the engine, but generally no.
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Old 07-16-2019, 12:35 PM   #3
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Re: Likely an Old Question, please bear with me

details for my feeble mind Mike, please. Why not?
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Old 07-16-2019, 02:28 PM   #4
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Re: Likely an Old Question, please bear with me

You will find that there is a pressure port on the carb for operating the diaphragm pump. If you rotate the carb it will be blocked by the gasket on the carb. If the back plate has a clearance machined in it for the bottom of the piston skirt,you will not be able to rotate it either.
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Old 07-16-2019, 02:35 PM   #5
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Re: Likely an Old Question, please bear with me

Roger that. Thanks....poop
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Old 07-16-2019, 10:12 PM   #6
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Re: Likely an Old Question, please bear with me

Quote:
Originally Posted by Sandy View Post
Can the back plate on a gas engine be rotated 180deg to put the carb arms at a more favorable position?
Well I for one would offer a different opinion. But rather in most cases you can flip the carb...

First off.. does the carb have an external pressure port as in the first picture. If so then YES ! you can flip the carb.. But you would be much better off to flip the carb and the reed valve block at the same time.. see the next two pics of a carb and reed valve block.. Moving on to pics 4 and 5,, this engine does not have an external port it is done internally.. look closely at the reed block and you will see a slight bulge in the block.. that is the internal pressure port , and in pic 5 you see the same on the other side.. so if your engine has this.. then again YES !! you can flip the carb.. but again you are better to do so with the carb and reed block at the same time.. Now ,, if your reed block only has one port.. flip block and carb at the same time ,, again,, YES !! it can be done.. If for some reason you cannot flip both.. then take a close look at pic 4.. you see that wanna-be hole just to the left and down of the philips screw head.. that is where the external pressure port would have been installed. Now if you are up to a bit of drilling and tapping of holes.. you could install an external port here and then the same on the reed block.. just make sure to do it on the engine side of the reed valves.. Then simply flip carb only and install a line between the two ports you just installed.. and you carb is now flipped..

The information above is for entertainment only and not to be considered a working manual.. Your skills are yours.. and attempt this only if you feel skilled enough to do so.. Plan ahead !!! check everything.. like linkage clearances before starting.. some engines may have something in the way that could prevent you from doing this.. Like a Pitts muffler or an engine support ,, check everything carefully before starting..
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Last edited by jsparky; 07-16-2019 at 10:27 PM.
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Old 07-16-2019, 11:12 PM   #7
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Re: Likely an Old Question, please bear with me

BTW Sandy

Karma is a bitch and her husband Murphy is an A-hole.. and their gremlen kids run loose in my shop..

I hate them all..
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Old 07-17-2019, 05:35 AM   #8
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Re: Likely an Old Question, please bear with me

Well THAT"S pretty clear. Thanks Jeff
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