Final word on 78 308 carb float heights

Hi Mike,

Float level actual

Hi Mike,

Float level actually plays an important part in carb tuning. If the floats are set to high the engine can run to rich across the entire rpm range. I have always set 308 floats between 48-49 and exactly the same on all carbs with very satifactory results.

I can see no reason to set the floats higher or lower.

Regards, JRV

Thanks, JRV. One last question

Thanks, JRV. One last question. I've read some debate as to whether or not you measure the float heights against the main base of the float, or the 1mm-higher "soldered on" ridge of the float... I'm currently measuring against the smoother, "true" part of the float.

Mike,

I measure against the

Mike,

I measure against the bottom float corner or flat plane rather than the soldered ridge, without gaskit. While you're setting the floats also make sure they swivel striaght up and down (not crooked) and that the tab that rides on the needle is making a nice square contact.

Regards, JRV

BTW:

while the tops are sti

BTW:

while the tops are still off and once the bodies are assembled, fill with fuel and check carefully for no internal fuel leaks and that both injection nozzles work the same by cranking the throttle shaft multiples of times and inspecting the operations. Internal leaks of many of the port plugs is common and can lead to difficulty setting idle mixture if droplets of fuel are leaking into the throats via any of the internal passage plugs.

Regards, JRV