Tinny on the <span class="highlight">roof</span> hmmm .. best spot for the motor

His boat and rack are on the top of his Jayco, not the L/C.

Cheers , this is probably where i'm at at the mpment , p'd like a clamp/bracket to secure it up against the cargo barrier

I use a foam mat under and next to barrier then rachet strap to hold it in place. Works for me.

I've often looked at 2 stroke outboards on the back of cars & trailers that travel down dirt roads & wondered what the dust is doing to them, especially the multi cylinder ones.
With my twin cylinder 2 stroke quad we used to plug the exhausts for travel on all roads. This was to prevent any air circulations causing a back draft & drawing carbon build up from the exhaust into the barrel. On dirt roads it was to stop dust entering as well.
I reckon it would be worse for outboards because they don't have air filters.
Draughts could go both ways. Down the carbie or up the exhaust.
Then there is the dust that is left under the cowling after the trip. I have often wondered if any of that, if not cleaned out, would make it in through the carbie on start-up.
I have yet to see someone tape up the air intake or the exhaust outlets to seal their 2 stroke outboard yet.
2 stroke motorbike riders do the exhaust plug trick all the time. The plugs for this job are sold in motorbike shops.

I always tape the exhaust, the prop, water intakes and the air intake on the cowl but dust always seem to make its way in. And that is inside a canvas bag! Sometimes I really don't think we appreciate door seals!!!