i just got my first nitro sedan-used-it came with a slightlly used o.s. .12tr. my question is how long or how many tanks of fuel before a rebuild? i only plan on parking lot bashing,no serious racing. are rebuild kits availible? or do you order stuff individually? how many rebuilds can you get before you have to replace the block? if someone could refer me to a website with such info or any other helpful tips, that would be great and i wouldnt have to waste peoples time asking stupid questions. thanks-sean