Outdoor Power Equipment and Small Engines - Briggs hard starting

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slim
04-14-04, 08:45 AM
I have a lawnmower with a model 93902, type 3117-01 Briggs and Stratton that takes 10 -12 pulls to start, runs slow for a number of seconds and then runs well. It also starts on first pull every time after warmed up. How can I get this to start easier on first pull?

Terminator20
04-14-04, 10:31 AM
It could be as simple as that your sparkplug is very dirty and needs replacing. Or it could be that your carb is starving for fuel on a cold start, it could be that you are not using fresh gas. Let us know if your using fresh gas or not, and also check your sparkplug.
puey61
04-14-04, 11:58 AM
This engine has a diaphragm accuated choke - in other words, an automatic choke. You will likely find you will need to replace this diaphragm and you should be good. Briggs# - 391681 diaph. or the rebuild kit# - 494623. Either one of of these Briggs parts comes with instructions. Follow these, especially in regard to pre-loading the diaphragm spring.

Terminator20
04-14-04, 05:21 PM
The choke could very well be the cause, but I would still not want to rule out a dirty sparkplug. I have had a hard time starting a engine before when come to find out the sparkplug was extremly tard and carbined up.

Let us know how it goes.:)
cheese
04-15-04, 12:30 AM
Hello slim!

I agree with puey61. You described the symptoms of a bad diaphragm perfectly. One other less common thing that can cause your problem is valve clearance problems.
puey61
04-21-04, 05:22 PM
How'd you make out with your problem?