Exhausts aren't equal

[Charlie G]

I've noticed that the LH hand exhaust on my 650 seems to have more pressure comming out of the pipe than the RH side. I'm thinking this might be an indicator of weak coil or something. The carbs were rebuilt and synced by me last August. New plugs then. Valves adjusted as well and 2k miles sinced this work. I runs smooth and has good exceleration but this is judged by someone who has only rode a 450 in recent times. Does anyone have any ideas? The LH coil seems to have been replaced, as it is much cleaner and of a different color.

Thanks for you help!


Charlie G

[chef1366]

Different compression numbers?

[Steve]

Don't use exhaust flow as an indication that you have a bad coil.

The left coil does the outer cyinders (1&4), the right coil does the inner cylinders (2&3).

To further complicate things, there is a balance tube between #2&3 exhaust pipes, so some of #2's exhaust will go out both pipes, same for #3.

.

[Charlie G]

All the cylinders are relitivly close to each other in compression. After I wrote I wondered which coils fired what cylinder. Thanks guys.

cg

[Don-lo]

The carbs may need synched. Honda CB350/360 manuals actually directed you to equalize the exhaust pulses in order to synch the carbs.

Another possibility is one muffler may be plugged. My boss (owner of the Kaw shop) couldn't figure out why his Gold Wing wouldn't run well. When I revved it up, it shot little smoking balls of something out the exhaust. Over the winter, mice had been stockpiling dogfood in the right muffler .

[legaleli]

The carbs may need synched. Honda CB350/360 manuals actually directed you to equalize the exhaust pulses in order to synch the carbs.

Another possibility is one muffler may be plugged. My boss (owner of the Kaw shop) couldn't figure out why his Gold Wing wouldn't run well. When I revved it up, it shot little smoking balls of something out the exhaust. Over the winter, mice had been stockpiling dogfood in the right muffler .

Is it possible that there is a blockage in the pipe? I'm about to start a new thread on this topic.

[Steve]

The carbs may need synched. Honda CB350/360 manuals actually directed you to equalize the exhaust pulses in order to synch the carbs.

When you have separate pipes for each cylinder, that is a possibility, but with the exhaust setup on the GS, it's not possible.

... To further complicate things, there is a balance tube between #2&3 exhaust pipes, so some of #2's exhaust will go out both pipes, same for #3.