They do actually do a compact pump fr around £200 think it pushes about 200bar - about enough for a quad.
Reckon a red-top would do you OK for power, some 1/4 pipe, some skinny 6" rams (
) and a bit of clever plumbing, job done.
Of course, yer rides gonna be feckin rigid with juice fitted, unless you fitted an accumulator or two into the system - not the safest thing to put juice on TBH.....what with the short wheelbase and squishy human thingy on top and all that.....
