TOPIC:

Out of sync carbs will do that.
Steve

Sorry about the vertical camera angle. I don't own a cell phone and I am still new to taking videos with one.
My final sync is not this close as tiny changes made while tightening the lock nuts have big changes, but is better than it was. It is stronger off idle, and throttle response is more uniform. Much less noise from the primary chain knocking around.

I have idle set at 1200-1300 per the ND tach. I understand the FSM spec is lower however this is the lowest rpm I can get a somewhat smooth idle.

I achieved my highest idle with three airscrews at 1 turn in, and one at 1/2 turn in. I still get a cyl 3 backfire with the choke on, but no backfire with the choke off. The miss that I can't figure out is still there,

Rode to work today. It was about 50 degrees and I was able to come off choke pretty quickly.

I will check the new plugs soon.

If you can get #2 up a touch, the rest should drop.
Steve

swest wrote: If you can get #2 up a touch, the rest should drop.
Steve

They will, but they will all move by different amounts. After touching up the others one of them will have affected #2 and who knows where it will be then. I was just pumped to get 3 to read the same.

I am now in version 3 of my homemade tool. Perhaps my meter has some design flaws. I assume I would get better results with a Carbtune.

I had that problem until I found #3 was shut off all the way. I raised the idle then made the others the same as it. It's the lead carb. It started popping after I raised the needles.
Steve

swest wrote: I had that problem until I found #3 was shut off all the way. I raised the idle then made the others the same as it. It's the lead carb. It started popping after I raised the needles.
Steve

Good info. #3 is almost all the way open. The other 3 are nearly closed.

I need to inspect the linkage. Maybe the arm to the needle holder is bent.

Or not seated correctly. It don't take much.
Steve

swest wrote: Or not seated correctly. It don't take much.
Steve

Ya I've been there. I tried a sync last year and forgot to tighten a couple needle holder screws. Took me a while to figure what the problem was.

At least I'm not the only one.
Steve

Do I need to re sync the carbs if I remove and then reinstall them without making any carb or engine changes?

It would be good to check.
Steve

Spark plugs. About 100 miles on them. Some highway, but mostly city. 4 3 2 1 left to right.


I am using stock jets with the needle on the 3rd clip, Pod filters and stock exhaust.

If you look closely you can see the shoulder of the ceramic turning a light tan. I guess I should have left these in longer. They still look new.