I Have the above engine on a merry tiller, I dont know how old it is but it is getting on a bit, I am having some trouble starting it & when decides to start it runs for a short time then cuts out then its back to square one, I have changed the spark plug but it made no difference, I have noticed that on the carb diaphram one of the two small flaps only covers part of the hole, I intend to change this diaphram, but could it be some thing else causing the problem?
Hope you can help.

Gazza, March 2009

The diaphragm you describe is a fuel pump diaphragm. It's responsible for keepng a small 'cup' inside the tank full of fuel - this cup would be the float chamber in a conventional carb. No pump = no fuel = no go.

The engine has NO CHANCE of running properly without this. Costs pennies - change it!

phil_saunders@bigfoot.com

Phil Saunders, March 2009