Anything mechanical can be re-built whether it be a Japanese bike or a Harley Davidson motorcycle.
The devil is in the details.
Japanese bikes tend to be throw-away bikes and their manufacturers provide very little support as far as replacement parts go. If the replacement parts are actually still available for an older Japanese bike (more that two years old), the price for those parts are usually somewhere between the cost of a new kidney and the stratosphere...
A Harley Davidson motorcycle on the other hand, has huge support from both the dealers and the after-market. Any and all parts are readily available, you have a choice of going with stock parts or a huge selection of high performance replacement parts, and usually for very reasonable prices.
As a professoinal mechanic who worked for years in the automotive trade, I find the Harley Davidson motorcycle to be an absolute joy to work on and maintain compared to previous Japanese bikes I have owned.
I owned many smaller displacement Japanese bikes in my younger days then in 1984 I purchased a brand new V-45 Magna. What a piece of junk! After all I had heard about great Japanese quality, this thing spent more time in the shop than it did on the road. It was poorly engineered and poorly built. I have since owned four different Harley Davidsons since 1998, all purchased new, and each one absolutely trouble free.
A properly maintained modern Harley Davidson is every bit as well made, if not better, as any other motorcycle on the market but the difference is, it will still be going down the road long after many modern Japanese bikes have been recycled back into Tupperware or Fisher Price toys.
At the end of the day, you can re-build any Japanese bike if cost is no object but when all is said and done, you still end up with a Japanese bike.
Just my .02 cents
