balanced carbs

[tjhummer]

Yesterday, I finally got around to checking and balancing the carbs on my 80G. It was a strong, smooth runner before, but what a difference! They weren't all that far out of sync either. I'm happy.

[skids]

Re: balanced carbs

At what RPM did you synch them?

[tjhummer]

about 2500

[red bandit]

Why so low?

[pggg]

The higher the revs you can balance the carbs at, the better, balance them at, say, 1100 revs and they're usually a small bit 'out' at 2000 revs or over..

[LoHo]

What's the best way to keep the revs high and steady in a safe manner? I have a throttle lock, but the adjustment isn't fine enough to get it to 4k and keep it there. Is the large adjuster at the bottom of the carbs the right way to go? Crank it up, adjust the individual carbs, then ease them all back down to 1k?

[tjhummer]

after syncing at ~2500rpm, I slowly opened the throttle to about 4000rpm and all seemed to hold fairly steady and even. I called that a success. What say?

[pggg]

Any higher than 2500 revs or so and the gauges won't read any vaccuum anyway.

[GNEPIG]

.. i thought the idea of the carbs being synced was for a smooth idle, like at 1000 RPMs? sync them for a smooth idle and the rest should be the same.

[RUSH]

ive always balanced mine with the rpms around 900. If I recall thats how the book says to do it.

[ccogswel]

I just synched a set the other day. Done it at idle. It's a smoother rev then before but now it likes to climb to around 2500 to 3000 grand then come down. I'll try to set them again at a higher idle. Maybe I'll have better results. I guess it's good for the practice.

[pggg]

Yeah, next time someone balances their carbs down low like 900 - 1000 revs or so, sit the revs on 2000 - 2500 - betcha the carbs read a wee bit uneven again, I always balance mine as close to actual riding revs as possible, rather than just for a smooth idle..

[Pat Kelly]

I sync mine at 2,000 RPM because I noticed the sync changing with opening the throttle.
If you sync them at idle, all the butterflies are resting against their stops. As the throttle cable pulls, they come off the stops and now rest against the top of the linkage between the carbs.
Just don't go WOT and suck the mercury out of the syncer.

[GNEPIG]

If you sync them at idle, all the butterflies are resting against their stops. As the throttle cable pulls, they come off the stops and now rest against the top of the linkage between the carbs.

.. hhmmm, i thought that they all rested against one big stopper, the idle adjustment screw. doesnt one cable pull all four carbs open at the same time?

[Pat Kelly]

Yes, each carb has a 'stop' (spring-loaded to maintain tension) for the carb next to it. At idle they all rest against the bottom, when the cable pulls at the junction of carbs 2-3 they rise (ever so slightly) then they pull carbs 1-4 up along with them.
My E is so sensative when syncing, the reading changes when the screwdriver just touches the adjustment screw. I set it to where the reading will be when I remove the screwdriver, kind of like leading a moving target.