Topic: 1978 motor rebuild, white smoke at idle, SOLVED??

[PeWe]

My K2 smoked yesterday at first start, especially cyl 1. Stopped smoke after a while.  No smoke when revving when warm after s ride
Bores are on the high side with CI pistons around +0.04mm maybe more.

[robvangulik]

Parked it on the sidestand?

[PeWe]

How did you know ? 
I had thought about that.

Too much oil over guides plus overflowing floats with fuel from the carb beside?

[Dolomite]

After reading a bunch more older posts, including the ever wise words of Hondaman, I'm starting to suspect (hope?) It's a carb issue, as in the float, which would also fall in line with the issue only occurring on that one cylinder. I'm going to give that a check this weekend as well.

[Dolomite]

So update, first I was wrong about my main sizes, idk why I had 135 in my head, they are 127.5 running on PD42A with velocity stacks and 30ppi foam screens. Checked the floats too and they are all good. Motor is bored to 836cc with a CX1 cam. Changed from the 2-1 open piped and am now running delkevic  4-1 open pipes and from ngk d8ea to denso x24esu. Checked all my valves, only one that was off was intake on 3 was a little tight, everything else waa spot on. But I am still getting white smoke, and now its puffs at idle, plumes when throttling up and if I hold the throttle up while on the center or in neutral I can see streams of white smoke in the exhaust. I'm running out of ideas besides the rings on number 4 having not seated.

I went for a good ride after putting on the delkevic and the pipes turned a bronzish color. They are 304 stainless. Am I running too right?

[scottly]

Please post a pic of the "foam screens".

[Dolomite]

Black foam in them was changed out to UNI red 30ppi

[scottly]

Try running without the screens.

[Dolomite]

Okay, I'll try that tomorrow.

[Dolomite]

Took off the uni filters and just ran the mesh screens. Didn't seem to make any difference.

[Dolomite]

Swapped my exhause from the MAC 4-2 to a Delkevic 4-1 hoping to create a little back pressure. Seemed to be less, only happens sometimes at the crack of the throttle, whisps still come out of the crank breather at idle. I noticed today though that the golden color the 304s delkevic pipes are turning is uneven on pipes 2 and 3. Numbers 2 and 3 are darker at the head, with 3 even blueing a bit right at the head.

Is this something that happens because they are the inner pipes and retain more heat? I don't see how I could be running lean on 2/4 cylinders when all the carbs and plugs are the same but stranger things have happened. Could it be the coils?

[Dolomite]

Update: 125 jets came today, blew out the emulsion tubes with carb cleaner, put new 125 jets in (old ones were 127.5), checked and adjusted floats and buttoned it up. It's like someone flipped a freakin switch now. Throttle is smooth throughout full rpm range, appropriate back pressure to produce pops with aggressive downshifting, even the needles on the gauges stopped bouncing?!?

It still had a bit of smoke, hoping that's just residual and once I clean the plugs again and ride it some more it completely goes away.

Does this sound right to anyone? Even the gauge needles working correctly? I swear I'm not crazy.