Let's be honest, the US Yamaha ebike drive repair parts stream may not be what it SHOULD be. There is no US Yamaha rep providing input on this forum as Bosch does. Maybe that will come when somebody at Yamaha Power Assist Bikes wakes the freak up and starts taking action. Action as in, they should understand that it is their motor driving a Haibike or a BH and as such, they should be obligated to help a Haibike or BH owner in need of repair parts or advice. I'm not holding my breath. Up until their arrival, the only Yammy powered ebikes were Haibike and Giant. Giant has a good enough support network for themselves. But they are of no help to a Haibike or a BH Yamaha powered ebike owner when something happens requiring their assistance; because their Yammy motor drives are tailored specifically to Giant and no one else.
There are bricked ebike drives and then, there are
real bricked ebike drives. In the case of Bill's issue here, he was advised where to get a new speed sensor cable for his BH. Bill may be the first to tell you he put off the cable purchase because of either the price of entry or buying from an overseas (Italy in this case) source. But he may also be the first to tell you that he had the part arrive on his front doorstep in only a few days amount of time & probably wishes he had done it sooner. Many parts for that drive system are out there, you just need to know where to go for 'em. And let's not forget the great work Peter has done at Performance Line Bearings for us Yamaha, Bosch and Brose owners. As far as internal circuit boards or torque sensors; I don't believe none of the major players makes those parts available to anybody; in those cases, it's an outright move to a brand new motor. I stand to be corrected if that is not the case.
Aside from hoping for help from the manufacturer's, I have found this particular forum to have a very deep and experienced group of people who are willing to help with a problem at the drop of the hat!
Things could be worse. Bill could have a Shimano EP8 drive, which has a written history of failure in every ebike forum in the world at this current time. Bikes dying just after a few miles of use. Long wait times for motor replacements that may or may not be coming, resulting in a high dollar ebike sitting unused and inoperable. And the latest: broken/cracked spindle shafts. The curious thing though: it seems I see every new E-MTB on the market features the EP8 drive. From my latest issue of Electric Bike Action: Canyon. Husqvarna. Kona. Santa Cruz. Pivot. Norco. Yeti. Marin. Intense. KHS. Orbea. All with the EP8 or E8000 drive. I feel sorry for anyone buying those mountain bikes. I can only guess that Shimano gave those manufacturer's a cheap price of entry into their drive system vs the Bosch or Yamaha folks. I wonder if Ravi or anyone else privy to that info could shed light into why Shimano, with such a record for unreliable and bricked motors, has found it's way into so many newer bikes on the market.
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I'll let this picture do the talking as to why I believe the Yamaha PW was the best drive going. That picture was taken last fall and right now, she is a little under a hundred miles in going to 17,000 miles. Haibike Full FatSix. I placed her into service in April of 2017. Model year 2016 bike. Along the way, in addition to the original 400wh battery (still has 100% battery capacity in it), I picked up 3 additional 500wh batteries. As of this writing and after 17,900 miles of service, below is a list of all the problems I have experienced with my Yamaha PW drive and battery system:
A loosened spoke magnet in Spring, 2017. (tightened it up and continued on my ride)