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O.S. 91 Surpass valve spring replacement

Old 07-24-2006, 08:19 PM
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Sky Dart1
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Default O.S. 91 Surpass valve spring replacement

I have an older 91 Surpass which has a broken exhaust valve spring. Any hints on replacing this spring? Is there an exploded view or more detailed information available on this older engine?
Old 07-25-2006, 10:23 AM
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Default RE: O.S. 91 Surpass valve spring replacement

Exploded views are available at:

http://www.osengines.com/parts/exploded-views.html

The only real hint is to use a short piece of broomstick or similar piece of wood to put the cylinder head onto so that the valves don't move when you press the retainer down.
Old 07-31-2006, 10:25 PM
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Default RE: O.S. 91 Surpass valve spring replacement

I just bought a new Surpass 91 - 6-8 years old - new in the box.

After some 12 flights (about 12 minutes each) the Exhaust Valve Spring broke in half.

I have replaced the Spring and the engine is working well,

BUT;

Is this (broken spring) a common occurance with the Surpass?
Old 08-01-2006, 12:28 PM
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Default RE: O.S. 91 Surpass valve spring replacement

It does happen from time-to-time. Not particularly common, though.

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