115 yamaha suddenly only gets 4000 rpms- Help!!

cogs

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Joined
Jul 6, 2007
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noticed oil leak from hose going to engine, made repair, lost 4-6 oz oil. 10 minutes later heard change in engine, shut down, let cool... checked engine, started and ran for 30 minutes, only got 4100 rpms, loss of power. did i blow the engine?

ran compression test, bottom two cylinders come up zero- could it be the reeds? or am i in denial? dont understand how the engine can run @4000 rpm for 30 mins w/ out other 2 cyl.
 
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