Bad Flat Spot

Brumby Boy · Post by **Brumby Boy** » Mon Nov 27, 2006 5:23 pm

Ok over the last few weeks my brumby has been developing a very bad flat spot. it seems to be between 60 to 80km/h regardless of throttle position except below 1/4 throttle. if i accelerate very gently it dosnt seem to be as bad. has gotten worse since i WAS using ethanole but have now gone back to regular unleaded approx 4 tanks and it is still getting worse. i think it may be the ethanol has eaten the rubbers in the carb and or the fuel filters all need replacing. wat do you all think?

Cheers,
Turtle

Suby Wan Kenobi · Post by **Suby Wan Kenobi** » Wed Nov 29, 2006 10:57 pm

The ehtanol may have dislodged some crap hiding in the carb and it is now partially blocking a jet now. If you dont remember how old your fuel filter is you should consider replacing it anyway. Spray some carb cleaner down the throat to clean it up other wise it pull the top off the carb and see whats going on.

cameron · Post by **cameron** » Sat Dec 02, 2006 7:13 pm

Replace your pumper valve. It is the thing that pokes out of the top of the carb and is connected to the throttle by a linkage. Gasmiser do a cheap replacement.

Brumby Boy · Post by **Brumby Boy** » Sun Dec 03, 2006 10:27 am

sweet thanks guys
i havnt changed it since ive had the car so god only knows how old the fuel filter.
im not gunna bother fixing the carb as my ej should be done early next year ill just live with it i think.
Thanks again

EJ22Ute · Post by **EJ22Ute** » Sun Dec 03, 2006 5:20 pm

are your vacuum advance hoses all ok?

Brumby Boy · Post by **Brumby Boy** » Mon Dec 04, 2006 7:59 pm

Dunno havent looked
ill have to do it when i have light tomorrow

BaronVonChickenPants · Post by **BaronVonChickenPants** » Mon Dec 04, 2006 8:25 pm

I read somewhere to (with the engine running) spray aerostart or WD40 or something around your vacuum hoses, not on them, just let it vapourise near them, if your revs change than a hose near there has a vacuum leak.

Jordan.