O.S. 91 Surpass valve spring replacement
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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?
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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.
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.
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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?
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?