Topic: K8 carb question...yeah, another one.

[Buffo]

1978 CB750K8

I have now cleaned the carbs for the forth time.  I had to unclog the main air jet on the number 4 carb. It was totally plugged.

The bike runs much better. starts better, idles better when cold and "warms up" better.

I also turned the pilot screws out to about 2 1/2 turns each. that made a huge difference.

I have to sync my carbs yet. I am waiting for the tool.

However it has developed a pop from the exhaust while at low rpm.

Will this clear up wiith a good sync?

110 Main Jets
4 into 1  running no muffler (just the header)
K$N OEM replacement filter. In stock air box.
Dyna S ignition with 3 Ohm coils and new wires

Don

[eldar]

I thought the turns out were too much till I saw you use a k&n. Do you know which cylinder pops? If you do, you can idle for a bit and pull the plug. Generally when I get a pop, it is from too much fuel. and you would need to turn the screws in a bit to 2 or so maybe.

[Buffo]

I will clean up my plugs and do a reading.

Other than that I have no idea of how to find the popper(s).

Don

[eldar]

When at idle, just hold your hands over the exhaust, you will feel the pop there. You can also feel the pipes on the mufflers and see if there is a temp diff. The colder one is probably the culprit. Make sure you touch towards the end of the muffler!