Leaf Blower runs on choke?

Hi,

Hope you can help with my older Briggs, Little Wonder leaf blower. Model # 9005PD
Engine #130202 1670-01 code 87012907

It starts and runs fine for maybe 10 minutes, then dies.
I find, if I move the run lever halfway towards choke, it again runs normally for 5 min. and then dies. I then have to push the lever towards choke then back halfway and I get another 5 min. of running time. It continues this way until I shut it off.

I found the head gasket was loose, now tightened.
I changed the plug.
Air filter is new.
Maintained seasonally.
Fresh gas.

I did find a small gas leak at the gasket where the carb sits on the gas can.
Screws are tight, yet gas is present.

No other problems are apparent.

Have any suggestions?

Val

Val Fay
November 2005