Aviation Forum / General / Ultralight / October 2007

A friend of mine built an ultralight from scratch. He's never flown it
unfortunately due to an engine problem with his 447.  When he starts
the engine (which presumably starts fine), the RPM's climb up until he
has to shut it off.  It will not idle normally.  He's been told that

I have JPX 320D engine. Has somebody information about this engine
(manual scans, or pdf)?
What kind of fuel is the best for the engine?
Which spark plug is the best for the engine?

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