I've never had a pullstart break yet on 3 different machines. If you think the engine is too hot then you're running WAY too lean. very short quik pulls with the wrist is all it should take. The Volcano starts in 2-3 pulls after priming. Check out this if you wanna get a tiger drive[link]http://www.rcuniverse.com/forum/m_4068240/mpage_1/key_/tm.htm[/link]