Hello Garry,
Congratulations on becoming the owner of the Arrow.
Regarding your questions, its not going to be easy to answer in one email but here goes to set you on your way. Presuming you've not owned a Leader or Arrow before you might not be aware that Ariel published an excellent workshop manual for these machines, very, very detailed text with plenty of photographs, a must if you are going to totally strip the engine, originals pop up on ebay from time to time and they have been transferred onto disc that can be purchased, others here in the U.K. can supply reprints at cost and extra cost re the postage.
Regarding bearings for the crankshaft - these are 6205 bearings commonly used in a whole variety of engines and readily available, you should be able to get hold of them in Australia, that said and it doesnt specify them in the workshop manual but most owners fit 6205C3 bearings that have a little bit of extra clearance to avoid overcrowding but if you are only going to tootle around then 6205's will be o.k.to use.
Seals are all readily available here in the U.K. at least, you can buy a complete set for the engine off ebay which might be your best bet, item number 300875741482 supplied by Millhouse motorcycles
info@millhousemotorcycles.co.uk.
When first produced in 1958 Ariel fitted two seals back to back in the centre later changing them to a single double lipped seal, these are still around but I wouldnt fit them as we are now finding that they have deteriorated over the years and either crack or go mushy, try to buy new stock if you can and fit two seals back to back as done in the early years. The single double lipped seal can be difficult to get out of the crankcase, the single seals fited back to back come out easier when needed to be replaced. .
Getting the crank out is easy if you have the right tools, you will definately need a puller kit to get the two side doors off and a long 3/8 allen key that slides down the hollow crankshaft to undoe the bolt in the centre to undoe the two crank halves, the allen key is used in conjunction with a locating plate and bar to lock the flywheels to undo the centre bolt that is torqued up so you might need a long handled torque wrench and be prepared for it to come undone with a bit of a bang (not always) the bolt will then go tight again but keep turning the allen key as its drawing the two crank halves apart, these tools are readily available to buy in the U.K but going to be expensive for you if just doing the job once, there other Leader/Arrow owners in Aus it might be possible to borrow a set of workshop tools, if not I can point you in the right direction to buy a remanufactured locking plate and bar from Ariel Club member Brian Hinchliffe, dont know whether he does th puller kits, if not then probably Draganfly can supply them.
All for now. Roger
