Plumbing for Rotax Airbox Drip Tray Drains

Speculation:

Gates fuel injection hose (has slightly higher heat rating than the carb variant), with strategically placed aluminium wrap.

My favourite aluminium, for this sort of job, is builders flashing (replaced lead many years ago).

Obtained from hardware/builders supply in a role.

Its mailable, can be cut with scissors (don't use the wife's dress making ones).

Secure with safety wire.

If you need added heat protection, silicon a piece of exhaust wrap to the inside of the aluminium.

Note: The flashing, is very handy,  can be used for all sorts of other jobs eg making a temporary channel for draining oil, electrical "noise" shielding, etc😈

I was also thinking about fabricating a heat shield from a flat piece of 0.050 sheet and affixing it to the drip tray.  The shield would be designed to be between the exhaust and drain hose.

Yes that would work too. Sounds a bit more "involved" than the ductile aluminium.

FYI: Just my opinion;

The drip trays main function is as a heat shield, to shield the underside of the carburettor, especially float bowl

The likelihood of your drain pipes ever "seeing action" is extremely low.

When engine running, the drip tray will be quite hot, any fuel coming from the carb will likly be "flash" evaporated, long before it gets to drain away.

😈

Are you saying to wrap the ductile aluminum around the drain hose?  I have some fiberglass tape with a thin aluminum reflective coating...you can see some around a coolant hose in my photo.

Yes.

I also use "fiberglass tape with a thin aluminum reflective coating" but not where the adhesive will be "cooked"😈