I have a 3.3 with a os21tm and keep damaging the cooling head.
I have added a wing and it helped a little. Is the something you can buy that will protect the head?
You can get a roll cage to protect the engine from more serious damage or just feed some zip ties through some fuel line tubing and attach it to the cooling head. Would only need 3 or 4 of these and will help protect your cooling head from scratches and minor damage.