Question about 1991 Suzuki RGV 250 M

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RGV 250 m Backfire

Well.picked the bike up yesterday and after 20 miles the fuel started running out of the bike.with some help from the rac we stripped the carbs and it was the float jamming on.i then continued the rest of my journy home (80 miles) with out any problems.this morning got the bike out.warmed it up and set off and the bike is back firing like hell and will not rev under load and a bes will make it ti 6000 rpm.it will rev fine and smoothly when clutched in.the bik has just had a rebuild 600 miles ago and has new plugs.i've taken the air box of to check the carbs and they seem fine so i am now at a loss as to what is the problem

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  • philip_mon_e Sep 09, 2009

    the valve was good 300 mile ago when the engine was rebuilt so sould be good now.the boot between the carbs and blocks are good and the exhaust is tight on also.

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Could be a crack in the boot between the carb and the head. this cracks usually from back firing. also check the exhaust flange to ensure that it is tight. Have you checked the valve clearances lately.

Posted on Sep 09, 2009

  • mike fuson Sep 09, 2009

    Could be the carb needs to be redone, you can purchace a kit comes with needle an seat valves and all the o-rings required, I would recommend doing this. also give your air intake filter a good cleaning and I would throughly check over the carb boot as well , while you have the carb off to ensure that there is no air leaks.

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