This is the O.S. .91HZ to .91HZ-R Heli Engine Conversion Set.

Features:
- Converts existing O.S. .91HZ or .91HZ-PS engines to the newer fuel pressure regulated .91HZ-R version
- Rear cover plate with pressure nipple and rubber O-ring seal
- Check valve

Includes:
- 61E-R carburetor
- Cover plate
- Check valve
- Instruction sheet

Requires:
- Installing components on .91HZ or .91HZ-PS engine                    

Needle Settings:
- High Speed: Approximately two and a half turns from fully closed
- Idle Speed: At basic position when engines leaves factory
- Mid Range: One turn open from fully closed
- Mixture Control (low speed): Varies with each model and set-up, normal position is off-center