Hi Guys, It was suggested that I start a new post for my project so here it is. I am trying to get it to run for more than a few seconds. I am using a Walbro WT-644 and CH Ignition. Both are brand new. The 31cc, twin ring, Ryobi had been previously converted, (The Best Engines) but I have decided to swap out the Zama carb with the bigger bore Walbro and use the CH Ignition. The pulse hole is lined up but the carb does not seem to be pumping because it is not drawing fuel. When there is fuel in the carb. it starts with a few swings of the prop and runs strong for a few seconds ( until the gas in the carb. is used) then quits. I'll post pictures if someone will tell me how. I am new to this web site. Thanks for your help.