Bugger

[Fazafou]

It would be a pretty focing useless for repairing radiators if it foced the radiators instead of repairing them, don't you think?

You're missing the point.

Radweld is an old 'get you home' product, the idea being you chucked it in, it sealed the hole and you got the motor back to then drain the system and sort the issue.

It's not really meant as a long term solution and can slowly start to bung up pipes and fine coolant channels. Also if your head gasket ever leaks you end up with it in your combustion chamber.

Motorcycle engines operates at much higher stresses than the engines radweld was originally designed for.

Choice is yours of course, it may not have any detrimental effect, but why risk it.