On 3/27/17 5:44 PM, Norm wrote:
Tiller runs and starts ok but when I push choke in it loses power and
backfires

That implies lack of fuel. Maybe some fuel tank cleaner would help.

In article , says...

On 3/27/17 5:44 PM, Norm wrote:
Tiller runs and starts ok but when I push choke in it loses power and
backfires

That implies lack of fuel. Maybe some fuel tank cleaner would help.

It could also be an air leak around the carborator area.
That would give it too much air with the choke in.