OS 91 FS SURPASS
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OS 91 FS SURPASS
I recently bought a used OS 91 FS SURPASS. I fired it up, adjusted the needle for a ritch setting,took off and found the engine was too ritch so I landed turned it in about 1/8 turn and took off again. Flew about 15 min. the engine was perfect did some spins, loops, rolls stall turns and 4 touch and go,s I lowered the idel 2 clicks and landed. As i approached the engine was at low idel and quit just before landing. I felt I had just brought the idel too low. A few minutes later after refueling I found the engine had no compression. I pulled the valve cover and found the intake valve spring completely collapsed. My question is, How do i get the valve spring retainer off? HELP....
Thanks, Jim
Thanks, Jim
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RE: OS 91 FS SURPASS
When you say collapsed you mean the spring broke, it should be no problem just remove the two half reteiners, by pressing down on it, you need to remove the head to hold the valve from the chamber side. Not a big deal.
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RE: OS 91 FS SURPASS
Thanks Mister Biplane that worked Now to find a set of springs, Tower no longer lists engine on their parts list. Cowboy the prop is a Graupner 13.5X8 wide blade 15% nitro running at 9000 rpm. If thats too small or overrevving its time to go back to 2 strokes.
Thanks for the help guys,btw the spring was broken in three pieces. Jim
Thanks for the help guys,btw the spring was broken in three pieces. Jim