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1. It floods when driven for long in low gears
5. Consumes lots os fuel
Sounds like you need to replace a part.
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2. The float has been adjusted many times in vain.
3. The adjustment is estimated coz I do not have Owner's Manual
You only need to adjust the float once. A little know fact is that the float adjustment requires no special tools or Repair/Service Manual. Check out the
Carb adjustment article for the procedure.
If the fuel level varies after adusting the float, you need to replace some part. Probably one of these:
- Needle and seat assembly (it might be leaking)
- Fuel pump pressure is too high, forcing fuel past the needle & seat and overriding the float level (see the article for the fuel pump test)
- ball-bearing is missing underneath the accelerator pump, allowing fuel to siphon into the throttle bores during normal operation
Any other ideas???