Hi All,

I have a Pilot Laser with a DLE35RA, it was built earlier this year and has had maybe 8-10 flights. The first few flights were using a mineral oil and then I moved to a fully synthetic high performance oil. The engine has run perfectly out of the box with no adjustments at all until today. The engine starts fine as it normally would and idels ok, however at mid/high revs (5,000 RPM ish) its very lumpy, backfires and won't transfer to the high end when the throttle is all the way open. I have changed the plug (NGK6) and the result is the same, also tried adjusting the mix but no joy. The ignition is powered by a 6v Nim eneloop. Any ideas?