Too much choke? Sticky float valve due to old gas that gets cleaned out during the run?
My 22 had a similar problem, there is a spec sheet on the K5(?) posted on here which I found with float measurements. I tweaked the float arms "slightly" to lower the float a "hair". I no longer have the gas puking problem similar to what you are describing.
Thank you both for your reply
found the spec sheet and will try the adjustment tomorrow
Greg