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su carb problem - fuel restriction?


 
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wishmasteruk
Newbie


Joined: 15 Apr 2010
Posts: 7
Location: bridlington

PostPosted: Mon Dec 10, 2012 16:49    Post subject: su carb problem - fuel restriction? Reply with quote

hi i fitted and su carb witch was running fine up until the last time i went out, on the way home it seems to be loosing power up until it completely cut out, i found a couple of things that mite be the problem but would like some suggestions or other thing i need to check, iv changed the spark plugs as the old ones where carbon up, i found that the breather on the tank was mudded up (now cleaned) and i have noticed 3 nice dents in my fuel tank could this be the course?, it seems to start fine after the fuel has filled up in the su and runs fine on idle , soon as i take it out it cuts out at around the same point then takes ages to start, its as if it using the fuel in the su but cant fill the su up quick enuff to run, i took off the fuel line to the su and there was quite alot of pressure there?? is that normal, i put the fuel line into a fuel container and turned over the engine and it seems to be pumping fuel ok, so im open to suggestions.

cheers

jon
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PostPosted: Mon Dec 10, 2012 16:49    Post subject: Google Ads keep this community free to join!


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mickybruff
Newbie


Joined: 04 Dec 2012
Posts: 5
Location: walsall westmidlands

PostPosted: Tue Dec 18, 2012 13:03    Post subject: su carb Reply with quote

Hi Jon check you have oil in your dash pot also it may pay to check the diaphragm it may be holed or split. Hope this helps.
Regards Micky bruff
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wishmasteruk
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Joined: 15 Apr 2010
Posts: 7
Location: bridlington

PostPosted: Sun Dec 23, 2012 0:10    Post subject: hi Reply with quote

thanks for you reply i think you could be on to something by diaphragm do you mean the float at the bottom of the carb??
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mickybruff
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Joined: 04 Dec 2012
Posts: 5
Location: walsall westmidlands

PostPosted: Sun Dec 23, 2012 8:55    Post subject: su carb Reply with quote

Hi Jon on the top of carb there is a dome with a black plastic screw in plug,screw the plug out and put a few drops of engine oil in the pug has a plunger connected to it, but before you do that the dome is held by 3 or 4 screws take them out lift off the dome and the diaphragm is there, any doubts like if its soft and floppy change it, don't forget the oil when back to gether
hope this helps.
Regards Mickybruff
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wishmasteruk
Newbie


Joined: 15 Apr 2010
Posts: 7
Location: bridlington

PostPosted: Sun Dec 23, 2012 22:19    Post subject: hi Reply with quote

cheers for the reply micky, it has oil in the top but i don't think it has a diaphragm its a hif44 if that helps

i have changed the inlet fuel line to clear and seem to be getting small bubbles of air passing though, so i thinking the fuel line maybe corroded or something or is this normal?, i don't have any fuel leaks anywhere , its running and when it cuts out there in no fuel in the line to carb from the pump (its not pump as i changed the pump with same problem) but there is still fuel in the inlet from tank to pump, when i turn it over the fuel is bouncing up and down as if i have an air lock or something any ideas?.
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