July 14, 200619 yr My brat has become a gas sucker(14mpg) choke is staying open timing ok smell lots of unburned hydrocarbons in exhaust egr blocked any ideas
July 14, 200619 yr Possibly due to misfiring? Have you checked ignition components? I would pull the spark plugs and see if waht they look like, especially differences between cylinders.
July 16, 200619 yr Author Possibly due to misfiring? Have you checked ignition components? I would pull the spark plugs and see if waht they look like, especially differences between cylinders. Plugs all uniformly black idles fairly smooth plugs and wires new somehow seems carb dumping to much gas
July 16, 200619 yr could be a bad jet or a bad needle and seat valve. Take the top of the carb off (SLOWLY... these damn things fly apart sometimes, then you're screwed ) and have a look close to the float, there should be a little valve (screw-in?) between the chamber and where the fuel line reaches the carb. This valve is designed to cut off the fuel flow into the carb if the fuel level in the chamber reaches a certain level, pushing the float up and closing the valve. However, if the valve has gunk in it, it won't close fully, so the pressure from the fuel pump will force fuel past the valve and up & out of the jet. Take this valve out (Once again, carefully...) and either give it a good wash out, or replace it...
July 16, 200619 yr Oh yes, and never ever ever ever turn a carb or sections of a carb upside-down to have a look at it....
July 16, 200619 yr Rebuild the carb, replace plug wires, cap and rotor. It should be twice that milieage.
July 16, 200619 yr First off - we need more info. What type of carb (Hitachi or Carter/Weber), and if it's computer controlled feedback or not - check for an 02 sensor. GD
July 21, 200619 yr On my 83 brat the NOX filter went bad, I by capped it off on both sides. Horrible smell gone, back too 27 mph. joe
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