The parts guy at my local dealer was a TZ racer. He’s been in the business for 40 years. When I gave him the part number, he said, “This is a crank”. That was before he even tried to enter the number into the computer attempting to order an SP crank. He knows what he's doing.
So, you may be right, but my parts guy told me, “that the part could not be ordered unless authorized by Yamaha US.” It would be the same as trying to stock a bike that wasn’t legal for the US market.
Why would a dealer not want to sell parts? Specifically, a big expensive part such as a Crank. They profit from each transaction.
Attached is a Yamaha US parts catalogue webpage. I used the latest number for an SP crank. The result is obvious.
I'm really not trying to start a dick-wagging competition. You've recently been helpful to me. Just trying to let you know how it works here in the US.
If you remember, the US restricted street-legal, two-stroke bikes out of existence in 1985 thanks to our EPA having the same power to rule over us, much as the IRS. Violating EPA laws meant big fines or jail terms. Any bike imported to the US had/has to meet the EPA air-emission regs in addition to all the other requirements for manufactured motor vehicles.
Fortunately, (oddly) if a vehicle is over 25 years from its original manufacturing date, it is eligible for "Classic" status and legal to import and use on US highways. So, we can import TZR 250's (1993 models and earlier), but they aren't coming through Yamaha dealers. Many parts for our 3xv's are still available, but my guess is that because the bikes were never approved by the EPA, never really existed in the US, the parts catalogues for US Yamaha Dealers aren't allowed access to Yamaha Japan's full roster of parts that would support our 3xv's.
Maybe some other American who's been on the forum longer than me, can jump in and validate (or deny) my contention. I've read posts from SeaRick and jsnook and their recommendations for finding 3xv parts. They both live near large, US cities. I can't remember either of them referencing simply "going down to the Local Yamaha dealer to get parts for the 3xv".