Need help with Clean Catapulting

[Igneo]

This is really annoying, whenever I set the grenade on the hydra it starts smoking, but on my game the hydra explodes at a random moment so I do not know when to enter the bike, also, my bike sometimes flies away and I have to get a new one from the skatepark because I'm a PS2 stunter.

[DriZzly]

im not sure but i think the moment when the hydra explodes depends on were u throw the grenade
if u throw it to the front it'll explode faster as if u it throw at the back of the hydra
thats what i experienced
its just kinda luck to get the perfect moment to get on the bike like everything in stunting