Best way to tune / clean Hitachi Carbs?

 

I am a rookie at this carb tuning, but my motor is running poorly due
to the carbs but as far as I ccan tell i have appropriatley balanced
each float. I checked it by using a tube into a glass to verify that
each bowl has the same amount of gas?
is there a better easier way? Help :)

 

What year/model of bike do you have?

Anyways... I use a clear plastic tube about 4-5 inches long that I put onto
the drain nipple of the carb, then open the drain screw with the hose
pointed upwards.. the fuel level should stop about ~3mm below the seam of
the carb body & the carb bowl.  If it overflows and goes high, it either
needs adjustment - and check to make sure the float needle is closing
completely.  Small crud particles can cause a leak.

Have you pulled the plugs to see what carbs are running rich/lean?

Other items to look at:
- Air leaks/cracks in the carb mounts (mounts to engine)
- Air leaks in the carb boots (airbox to carb connection)
- Throttle shaft seals leaking air..

All the above 3 points would cause a lean condition that may also be
accompanied with some backfiring through the carbs, and possibly a raised
idle speed that would seem to race...

G'Luck!
Rex S.


wckaehler@gmail.com wrote in

 



If you are experiencing back firing through the carbs, I would check the
timing and valves as well.  There is only one way that backfiring
occurs.  The engine is firing with an intake valve partially open or
partially deteriorated.  A compression test will identify witch one it
is.

Good luck.

Ride safe.
Serge