Smoke, Smoke Options

[Boothy]

Cheers all!

Sorry, but I again need to ask for help.

New engine blowing smoke. 1.7 punched out to 2.0 with a big bore kit. Cam, Weber 40s. It started and ran pretty well late last fall. Used engine break-in oil as recommended. No smoke but sluggish acceleration -fine at high RPM.

With the warm weather (finally) I swapped out the Weber jets to the recommended .50, 1.50, and 1.95. Ran it up to 3300 with a timing light. I remembered I did static timing but not dynamic. Now it sounds pretty good but I'm seeing light blue smoke and a really black exhaust. I don't think the jets were that different but no markings so not sure.

My immediate horror was a broken ring -I really don't want to pull the engine again. It idles fine and sounds strong. I'll do a compression check. When it idles, there's no smoke. When I bring it up, it begins to smoke a little. Then it's consistent—no horrible but noticeable.

It sounds strong. It idles nicely at a 1000 and revs up fine. I'm hesitant to push it until I figure out what's going on. Changed the oil to 20W-50. Could it be, with the soot on the tailpipe, my jets are wrong? Stretch I know but hopeful. Heads are new so the oil in the guides shouldn't be an issue.

As always, thanks in advance!

[Boothy]

An update...

Thank you all for the advice.

It's been a while due to other demands but I adjusted the valves again and carefully checked the timing. I even added the fancy CB Perf valve covers to stop the oil drip on the driver's side -no go. After $200+ dollars and some wrestling, IT STILL DRIPS. Everything was clean. I'm ready to use roofing tar.

Anyway, sitting with a beer, looking at her lovely stern and digging deep down into my soul, I had an epiphany. Both sides of the exhaust are black as Hell, but it idles just fine after warming up. Hmm. "You re-jetted you dickhead so it's too rich."Never thought that would cause smoke, but I'm hoping that's the culprit. If it were a ring or something, it would only be on one side etc.

I re-jetted to 1.95, 0.50, and 1.50. Sorry just the bags in front of me.

I have a 1.7 punched out to 2.0. Weber 40s. I re-did the venturi to whatever was recommended.

Correct jetting?

Thanks in advance!