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Old 11-04-2009 | 10:18 AM
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psuguru
 
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From: ChelmsfordEssex, UNITED KINGDOM
Default RE: When is a pump necessary and what are it's disadvantages?

ORIGINAL: bigtim

here is a couple of photos of my older pumped OS 120 spII it has a metal pump mounted on the back plate pre surpass III plastic pump version.

if you stick the starter on it for a few revolutions it will self prime pretty quick, OS recomends using a electric starter on there newer 4 strokes so priming isn't really a issue at all.
Nice plane.
I think I must have the Sullivan Wimpatron starter, because it won't turn my OS FS91-II-P over compression.

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