It's a runner for sure, but those amazonian vacuum gauges just don't cut it. Watch this if you're bored. I think it's cool, but you know me, nerd!
https://youtu.be/8hw5nqO0y4o
Watch it, I need lots more you tube watch hours. lots
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It's a runner for sure, but those amazonian vacuum gauges just don't cut it. Watch this if you're bored. I think it's cool, but you know me, nerd!
https://youtu.be/8hw5nqO0y4o
Watch it, I need lots more you tube watch hours. lots
So not reading your service manual these comments may be all wet but when I synchronize Yamaha Carbs I have the linkage loose, Nothing touching the timing advance cam on the throttle linkage, pencils with the eraser end lightly holding the butterflies closed on all butterflies at the same time (can get tricky) I lock down the lefthand thread screw that keeps all the linkages together so all butterflies open in perfect union. Does your engine have the same adjustment as the Yamaha's I have experience synchronizing?
I'll take a pic and show you. Sounds similar. One thing though, I don't think mine would run with all the butterflies completely closed, dono. I think mine are ever so slightly open.Quote:
Originally Posted by Rojo
And if I can remove the advance with it's linkage, that would be great, it's in the way of feeling the vacuum on the bottom carb.
Great feedback John. And yeah, I suppose I should read the manual, doh!
Slab the very first thing you do is back off the idle screw till it does not touch. Then close all butterflies. You will never get it synchronized unless the linkage is first synchronized. Otherwise all the butterflies will open at a different rate making the engine idle rough. Once the linkage & butterflies are in sync then you turn the idle screw out opening all the same amount at the same time.
Certainly sounds like a fella needs 2 pairs of hands at least.
Yamaha does not mention using pencils that comes from tuning old Evinrude Crossflows. I carried it over to Yamaha tuning to get 3 cylinders to idle perfectly. The power packs calculate the piston position on cylinder #2, it does not have it's own trigger. If the carbs are super perfect but the Pack is slightly off the engine still idles like all three cylinders has a trigger. After that I have used pencil erasers to hold the butterflies ever since. Also when you go to tighten the linkage lockdown screw (usually lefthand thread) you have to hold the butterflies open off the lands so the torque from the screwdriver does not change the linkage setting you just worked to get perfect. I can get very tricky to do on larger outboards.Quote:
Originally Posted by DockShootinJack