The most efficient and low cost way to ship motorcycle parts to Canada is as follows:
Ship via the mail service (only)
Clearly mark on the outside of the package Contains Motorcycle Parts Only - Duty Exempt See Canada Customs Tariff Guide Chapter 87 Section 19
subsection 87.14 Parts and accessories of vehicles of headings 87.11 to 87.13.
Of motorcycles (including mopeds):
8714.19.00 00 - -Other - MFN Tariff Free
That should keep the wheels of commerce moving
(this is important )
Put the Value of the parts on a label invoice on the exterior of the package. Insure that the invoice matches the cost of goods on the declaration form
Show the price in the local currency i.e. Australian dollars so that s easy to have the HST (or in Alberta's case the GST correctly calculated)
Purchase package tracking
As an FYI I called CBSA on this issue because the section is hard to find. The officer I spoke to kept telling me that motorcycle engine parts were dutiable. When I pushed her to tell me where that section was she said oh, I guess you are right but I wa sure that engine parts are dutiable I just can't find it in the guidebook.
Customs have an impossible job and need assistance putting the information on the package makes it much easier for them.