ORIGINAL: pauser98
I have a RCV 91CD engine with the following problem.
This engine almost always starts at first kick, idles at 2,300 with 14x6 Master Airscrew prop and Omega 15%.
Throttle advance from idle to 3/4 throttle is smooth and rpm reaches 8,900 at this point. But from 3/4 throttle
to full throttle, the engine splutters and rpm drops to 5,500 and remains there. The high end needle is
set up 1 1/2 open. Closing it by 1/4 will not get the rpm up. Neither does opening it by 1 to 2 turns.
I notice 8,900 rpm is the RCV specifications for this engine and prop combination.
Chris
Hi Chris,
The CD series uses standard props so your prop selection is right on. Try leaning the high speed needle until the enginse smooths out at peak RPM. Our records show that 1 turn is about right but it does vary somewhat, about 1/8 turn either way in practice. To check the setting, briefly pinch the fuel line and look for an approx 200 RPM increase before it quits to be sure you are not too lean. Follow the owners manual instructions from there. If that does not work, contact me directly for more assistance. BJ
Best Regards, Bill Jensen
BJ's Model Engine Service*, 51 Hillside Dr., Beacon Falls, CT 06403
phone: 203-888-4819, email:
[email protected]
www.bj-model-engines.com
*a trade name of Flight Star Devices, Inc.
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