The Cal-look Lounge

I have a strange problem with one of the IDA throttle. missfire happened on cylinder 2. I cleaned carbs 3 times and change plugs 5 times and changed manifold gaskets 3 times. but i never got the cylinder 2 fired. the plug seem to dry.  short story i swap over the carbs from left to right and viseversa. now cylinder 2 fired good and the problem moved to cylinder 3. assuming the carbs was the problem. what would be causing the carbs did not delivered fuel...

Blocked jet?

idel jet or channel

Udo

This Every time, unscrew the idle slightly with the motor running, if the jet is plugged it will kick in now, the fuel goes round the jet,  if it don't kick in, the channel is likely to be plugged.

I have done several adjustment on idle screw. fully screw in, a half anf fully screw out not make any different. I think will be the channel. any suggestion how we clean the channel. i have cleaned it 3 time using carb cleaner and blow it with air. i think i will soak it on diesel or kerosene for days.

Ultrasonic cleaner,if that's what they are called

Back off the idle JET not the screw...

^^^^^^^^^^^^^ THIS^^^^***********.      .. Another possibility is a twisted throttle shaft....

the carbs was working good on last race. arround 3 months ago. also I have swap arround idle jet and holders as well as main jet. but nothing change. I think i will send it for ultrasonic clean. there are company that clean injector may able to do it.

If the throttle area is bored too big the idle screw can break through the case so it can not work correct . Look at the hole for the screw at the throttle


Udo

thanks all of your advices. the carbs is back to normal. i think blocked on channel.  ;D

I am having the same problem. What did you end up doing to correct the issue?