The engine is new,sent back 3 times 1st time I called aand he said I could clean and reseal with only loctite 518.I took apart and the intake block was warped .017 so i sent back.2nd time first flight doing same thing, took appart and block still warped and still leaking.He sent new intake block and gsk's and I put together.Leaked first flight between carb and intake,resealed still leaking. Sent back again and still leaking after first flight.Hesitation the same.I'm wondering if they should'nt be using something better then 518??This is a engine I wish ups would have lost..LOL! I'm going to have to get a new box for this engine,wore it out shipping back and forth.