hibshman25
www.barnofparts.com
I supplied a customer with an engine a few months ago and he shared with me his adapter for the Yamaha 120 engines. It's an aluminum adapter that replaces the oem recessed bearing holder on the pto end of the motor. The oem bearing gets transferred to the new adapter, and the adapter recesses into the case just as the oem one does and mounts with 4 bolts. The bolt size on the adapter was increased to handle the load, so the 4 tapped holes in the engine case need to be drilled and re tapped to the larger diameter. The adapter has a flange large enough to accept the rotax c gear box 8 bolt mounting pattern. The gear box serves as the template to drill these 8 holes. These 8 holes are not not pre drilled in adapter due to the fact that different builds require different orientations.
To make the the PTO connection between engine and gear box, a new pulley/hub is supplied with the adapter plate.
As of this morning the customer has 48 hours of flying time on this adapter combo and a rotax c box. If anyone is interested in this set up, he will sell the adapter and hub for $700. If anyone is interested feel free to contact me and I will provide contact info for the gentleman making them. I'm not aware of anything like this presently available so I wanted to share my findings.
First photo shows the oem bearing retainer
Second and third photo show the rotax c attached to engine
Fourth photo shows the adapter in rear, original rotax hub to left, and the new yamaha to rotax hub on right.
To make the the PTO connection between engine and gear box, a new pulley/hub is supplied with the adapter plate.
As of this morning the customer has 48 hours of flying time on this adapter combo and a rotax c box. If anyone is interested in this set up, he will sell the adapter and hub for $700. If anyone is interested feel free to contact me and I will provide contact info for the gentleman making them. I'm not aware of anything like this presently available so I wanted to share my findings.
First photo shows the oem bearing retainer
Second and third photo show the rotax c attached to engine
Fourth photo shows the adapter in rear, original rotax hub to left, and the new yamaha to rotax hub on right.