newbie needing help with engine rebuild.

Yo Woodrow,I thought you were supposed to shift just after it quit pulling,or just before it backflips ya! :woohoo:
Check your pm box

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Is this the type of carbs you are talking about?

Yes.

On second glance, I'd double check with the seller. The engine side of those carbs look suspiciously like the 26mm variety.

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pauleaston wrote: [attachment:1]C:\fakepath\$(KGrHqNHJF!FCR7SuFdhBQt,ZhpdJQ~~60_3[1].jpg[/attachment]
Is this the type of carbs you are talking about?

No.... Those are Non-Pumper.

These are Accelerator Pump type Carburetors.

See the different Float Bowl on the No.#2 Carb in the second photo. That's an Accelerator Pump Rack of Carbs.

The carbs I am running now have identical bowls on them. Do I need a fuel pump to run 28mm?

sorry if I am asking dumb questions

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If your Carburetors look like this picture above.... You may already have 28mm Pumper Carburetors. Measure the Inside Diameter of the openings on your carburetors, the side that gets mounted to the "Cylinder Head", the Intake Side, not the "Airbox Side". Post up your measurment.

i'll check those carbs tonight after work. I found the answer to my dumb question. wiredgeorge's has a good writeup for newbies on his site (wgcarbs.com0 I really appreciate everybody's help. Hope I will be able to returen the favor. Thanks

No fuel pump needed. The accelerator pump was to help cover up the low speed air velocity which caused a bog with larger carbs, better throttle response.

Les

Did you do a compression test before pulling it down? Or a leak down test?
Some of your problem with it running poor may well be with the carbs and or ignition. Since your pulling it a part, have you inspected the ignition components? Was the ignition advancer stuck/ stiff? Points burned? Coils weak/ cracked? Voltage in the supply wire to the ignition low on voltage supply? These are all things to be checked. Once you get to ordering parts, replace the basic ignition parts, points/ condensers/ plugs/ and at least the plug wires if not coils.
Not pulling hard could easily be miss jetting, or weak ignition/ stuck advancer. Rough idle could be vacuum leaks at the intake manifolds, as they crack. Also dirty carb circuits, miss connected vacuum lines, etc.
Do you have the service manual for you bike? Sounds like you might when you posted saying the cams lobes are out of spec.

I measured my carbs and confirm they are 26mm. I also measured my cylinders and the measure 2.599"/66.01mm and my pistons measure 2.594"/65.88mm. They appear to be in good shape. So some new rings and a ball honing should be good. If I install 28mm carbs will I lose some bottom end without a accelerator pump?

You said you went back to running an Airbox which is good from a tuning/jetting standpoint. If you're looking at Non-Pumper 28's they are the early Z1 Carbs and some people view them as not reliable. At this point spend your money on the "Hone" & "Re-Ring" and a "Valve Job", and straighten out the 26's that you have. You should see a world of difference.