On Sunday, July 5, 2015 at 4:11:46 PM UTC-5, J Burns wrote:

I believe port blockage is a gradual process that reduces noise and
power, but the motor still starts normally. I've cleaned carbon from
ports and sometimes mufflers, but I've never had enough to notice a loss
of power.

Then this one should be written into the books...it would barely start and stay at low speed. Nearly 100% blocked. I don't know what they used for gas/oil mix?