I have a 8HP and a 11HP briggs electric start motors they both seem to have similar problems starting In that as they crank and come up to compression they just stop turning and the starter has trouble getting over compression, This is with a very good battery (car type) some suggestions please. I have checked the key on the 11HP and replaced it as it had some damaged but was not sheared and did not help.
I have tried to crank with spark plug disconnected to see if it was firing to soon and same condition prevalies
DARRELL
email TRON@SENET.COM.AU