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04-13-2006 | 07:48 PM

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NM2K

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From: Ringgold, GA

RE: Chasing the needle

Quote:

ORIGINAL: richrd

Last weekends at the Toledo show I picked up a Royal 28 (BTW for $20.

) cleaned it up an put new O rings in carb. It started right up but can’t seem to get the mid range transition the way I want it either great high end and idle but then stumbles and rich mid or great mid but too lean on both ends.

So question is this typical Royal 28 or is something wrong with this carb ?

Setup is tank rubber banded bottom with base mount and fuel is wildcat premium 15%.
Try different glow plugs from 4 stroke too A3, A8 etc only change minor things but A8 seem to be it’s favorite.
Rich

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Drop down to a 9x4 or 9x5 prop. A 9x7 is causing you to tune the high speed needle way to rich. The midrange metering is fixed, but associated with the high speed needle. By tuning way rich to compensate for too much prop, the midrange becomes way too rich for good running.

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