Tough cold start
I have a 6.5 Briggs and stratton Lawn Boy push mower. 124T05-0216-B1. It takes about 12-15 pulls to get going. Each time runs good I think for about 2 seconds. Once it's running it's fine. You can stop it, come back and start up fine. Carbs clean. Fresh oil. Compression test about 55 psi. Did a leak down test up to 40 psi. Stayed around 36-38 psi. Any ideas?