Syncing the carbs, odd problem

[AudiA4_20T]

Hey everyone,

So I made myself a manometer that is pretty good. Used gear oil in it so the fluid doesn't move around too much and have everything hooked up. Here's the thing that I don't understand. When I start the bike, it starts pulling cylinder 1 a bit more than the others, to the point where the other cylinders start going down and I have to shut the bike off or Cylinder 1 will start pulling in fluid. Is this normal? Should I crack the nut on 1 and adjust it quickly to pull it down and then keep fine tweaking everything?

Thanks,
Clint

[Agemax]

try bench syncing them first, to get them in the right ballpark, then try again with the manometer

[BassCliff]

Hi,

Yes, it looks like you'll have to start there so that #1 doesn't suck all your oil out of your manometer.


Thank you for your indulgence,

BassCliff

[Gonzo]

I would remove some of that fluid too. Fill it so that even if a bottle gets ALL of the fluid that it isn't enough to get sucked into a cylinder. All you are looking for with these homemade jobs is that you have an equal vacuum, NOT equal fluid levels. Well, I guess if you have an 82 you need slight pull on 1 and 4 right? So equal is not quite what you're after (iirc anyway, I have VM styles so equal is good for me) Still, I would drain some of that fluid to avoid the problem.

[AudiA4_20T]

Will do this tonight!

[derwood]

pinch the hose

[Big T]

pinch the hose

Hoses need a restrictor

[AudiA4_20T]

Ok! Benched synced the carbs. It's incredible to actually see the plates come together. Makes me feel like they're finally almost perfectly together. I got the carbs on the bike but the idle is still ~3000rpm. I turned the main screw down but it either raises it PAST 5k or stays at 3k. At this point am I just messing with the pilot screws on top of the carbs to get it down?

Here's a quick rundown of what I've done.

- New carb boots
- New Exhaust Hardware
- Bench Sync

[BassCliff]

Hi,

Could it be that your throttle cable needs adjustment?



Thank you for your indulgence,

BassCliff