K .B 7.5

[glen graham]

Hi All

Having problems with the K.B 7.5.Runs well but when warm just cuts out.Have gone over motor, fuel etc.Can anyone help.Is it too lean???

 

[moparbarn]

what model 7.5? air cooled? tune pipe? what is warm to you? 1 or 2 laps, or near the end of a run? more info on the set up will help. could be lean, or a fuel tank issue. try 1/8 to 1/4 turn richer first.the air cooled motors have to be fairly rich at the start of a run, as they will lean out as they build heat. if that doesn't help, does it do it the same time/fuel level every run? if so, it could be a crack or hole in the pick up line inside the tank. fuel level gets down to the break, & it sucks air.