You really need a low pressure tyre gauge, and set the pressure at 5 lbs (or 6 for IRC)
http://www.trialsbits.co.uk/product_info.php?cPath=94_168&products_id=525
Asking for a friend.
Anyone know where to get a con rod & big end for a MZ 150.
Apparently they can be machined to fit the Bantam.
Thanks in advance.
Ross