Carbtune and Sync Questions

[niclpnut]

Hi guys, I'm having some issues. 83 1100ES. Stage 3 kit. 4-1 pipe, K&N pods. Carbs cleaned as per guide and all O-rings replaced. Float height set as per manual.

I'm on the last stages of the build and am using the Morgan tool to sync.

I read through a bunch of threads on the topic and still haven't found a definitive answer.

I bench synced the carbs and can get the bike to start on choke. Once its warmed up a bit, I'm eventually able to get it to idle off choke.

My mixture screws are set at 2.5 turns out as per the jet kit. I've replaced the the intake boots, and they are snugged down tightly to head and carbs. Fuel line attached to temporary fuel tank on bars, and vacuum line plugged with a golf T.

Couple problems.


First, If I try to throttle up it will bog down around 3k.

Second, with Carbtune hooked up, at normal idle 1k rpm, I get little to no readings. At about 2k im getting around 16-18 cm hg.

Seems like an air leak, but boots are firmly seated.

I've gotten it all balanced like that as well as possible, but still having issues with throttle, and the occasional pop. So obviously there is still an underlying issue.

Double checked the carbtune itself and can get the tubes to move with some suckin!

Any help or advice is greatly appreciated.

Nic

[Greg B]

Adjust the idle up to 2000-2500 RPM with the adjuster screw when doing the actual sync. After you are done, adjust idle back down to factory spec.
Floats heights set properly?

[Dave8338]

Valves set to spec?

[Steve]

My mixture screws are set at 2.5 turns out as per the jet kit.

Whether the kit suggests it or not, I like to go a bit richer on the mixture screws at first, then, when things are fully warmed up and synchronized, tweak them down to the "perfect" mixture. Yeah, they might end up back at 2.5 turns, but I usually start at at least 3.0. If nothing else, the richer mixture will help it start and run with less "choke" so you can get to your sync quicker.

Second, with Carbtune hooked up, at normal idle 1k rpm, I get little to no readings. At about 2k im getting around 16-18 cm hg.

Adjust the idle up to 2000-2500 RPM with the adjuster screw when doing the actual sync.

I have always done my sync at just over stock idle, about 1200-1400 rpm, but you should know that the factory manual says to run it between 1500 and 2000 rpm while synchronizing the carbs (they call it "balancing").

.

[niclpnut]

Float heights set to spec, valves adjusted correctly.

I am trying to balance at 2k rpm.

I'll try 3 full turns out on the mixture and start there

I thought it odd that I don't get much of a reading at idle speed, and only 18 cm hg at 2k.

[Greg B]

[QUOTE=
I have always done my sync at just over stock idle, about 1200-1400 rpm, but you should know that the factory manual says to run it between 1500 and 2000 rpm while synchronizing the carbs (they call it "balancing").

.[/QUOTE]

If you read the Carbtune instructions, you will see it says to adjust the idle up.
I had to read it twice before I realized it.
Carbtune ain't exactly the same as mercury filled carb sticks, or vacuum gauges.

[rapidray]

You also need to get the mixture screws adjusted CORRECTLY before you try syncing the carbs. Use the "fastest idle" method to get the mixture screws set CORRECTLY. Ray.

[niclpnut]

Thanks Ray.

Started at 2.5 turns out, and after adjusting mixture screws for high rpm I'm getting strong readings at idle.

For some reason I had thought balance then high rpm.

Getting closer. Wish it wasn't raining so I could take it for a spin.

Nic