On the topic of no start issues, I recently had to replace my front oil seal with a repair sleeve, which all literature i have instructed me to tear down all the way past front cover. i found that un necessary to remove or install the new seal. I still managed to become 180 degrees out. HOW WILL i know if i am back on time as there is still a no start and i do get backfire out of carb. PLEASE help as i am new to this forum or any forum for that matter. thanks