A little carb synch story ...

[Horst]

Last Saturday, I made arrangements to get my carbs synched at a local shop (not a dealer). This place let me remove the plastic, they synched the carbs for a very small cost, and then I buttoned it up again. We've done this before, works well.

What we found - Before tweaking, we had a good look at where the carbs were at: not too far off but one bank was out of synch with the other. This explained why I sometimes had buzz in one peg and sometimes in the other. Handlebar buzz was small but there.

What we did - We decided to bring the two banks in synch, but it was not easy to have this both at idle and at 4,000 RPM. We left it synch'ed at 4,000 and off a bit at idle, figuring this was closer to the real world.

Results - power and smoothness in the 4-6,000 RPM range is definitely improved, and general riding at higher speeds is better now. I gave up a bit of smoothness at idle, will ride it this way till November when I'll do the valves and re-synch again. :biker:

Anyone else have a story ?

[Horst]

OK, the final carb synch is done ...

Findings - one bank was out of whack with the other bank, tweaked the screws just a bit and wow, now they're all at 28 cm (Hg ?) ... revved it up and they stayed pretty close ... perfect at idle.

Will leave as is and road test in a few weeks ... :)

[CarSalesman]

Horst: I went through that same logic and process. The book says to sync at idle, but I figured that didn't make much sense. I synced at about 3500 rpm, and thought it felt great. The goal, actually, was to sync at a throttle angle similar to 3500 rpm on the road, but without a load, that much throttle would probably explode the engine. Anyway, I did similar to you, and was happy.

I recently decided to do the sync again, and this time did it at idle. I actually did it at very low idle, down around 800 rpm. The result is MUCH smoother than when I synced at 3500 rpm. BIG difference.

IMHO, if you want to go through it all again, you'll see some improvements using the book procedure.

[Simon Soh]

did u guys tried synch her after warm up & fine synch once she's at operating temprature(when fan is activatedf), & conclude by find-hearing whizzling valve sound when u gently throttle up to 1500rpm...?

I usually ride a few miles to get it nicely heat up, let her cool for approximately 30mins before I synchronise her. with idling setted at 950rpm & resetting it by turning the synch screws 1/4 turn in then gently release vaccum intake to balance all columes. I start with synching no. 2 to 4(master fixed), then no. 1 - 3 follow by no. 3 - 4.... in between I maintain idling as close to 950rpm as possible.... check synch by listening the whizzling valves as u throttle up... walla..! it's done within 10mins...!

optimum result to achieve is to synch her immediately after a trip. ;)

[CarSalesman]

The time it takes to do a good careful sync job, your engine will be *plenty* warm by the time you're done. No need to go riding first. Also a lot easier to attach the sync hoses when its cold.

[Simon Soh]

can be done this way, tried few times.

I achieved best results after ride synch, smoother intake & optimun temperature to work on. :)

The time it takes to do a good careful sync job, your engine will be *plenty* warm by the time you're done. No need to go riding first. Also a lot easier to attach the sync hoses when its cold.