Hi 2lazy and everyone. I'm responding on behalf of the Cambridge Electric Bike Sales shop. Firstly to our customer 2Lazy I'm glad the chain breaking issue has been fixed and I'm sorry you had this repeat issue.
It's always frustrating when things go wrong and time and money have to be spent travelling to put them right.
The Yamaha system although exhilarating is particularly hard on bike transmissions and we do advise proper use of gears. If the chain contains any weaknesses the chain is more likely to break than on a standard MTB.
In the end we sent a mechanic to our customer to replace the 2nd chain.
With regards to the other issues we have issued advise regarding transporting the bike.
I'd like to say that although we mentioned the price of the replacement chain no payment was asked for any aftersales service or parts. This wasn't clear from the initial statement.
2lazy I appreciate your disappointment and would like to offer a store credit towards fuel costs. just get in touch.
To The Electric Transport Shop-
Thank you for the response. I saw this post a couple of weeks ago but I've been so busy with work and other things in recent weeks I just haven't had time until now to reply.
So just to give you a quick update. The independent mobile bike mechanic fitted the new chain (KMC X10e) and reindexed the gears. Since then I've been on four rides totalling 60 miles and I'm happy to report that the bike feels much better, all the gears shift correctly, I can now use all the gears, I no longer get any phantom shifting and so far (touch wood) the chain has stayed in one piece. The bike mechanic clearly knew his onions and described to me the process he went through to get the chain to the correct length - which if anyone else is interested has 118 links.
I also want to address a few points raised in your post -
Firstly it's absolutely correct to say that all the after sales repairs were carried out free of charge and all replacement parts were supplied free of charge. If my post was in any way ambiguous then I apologise as that was not my intention.
However while we're correcting ambiguities there are some things implied in your post which I'd like to address.
Firstly yes the bike can be exhilarating to ride but this is a moot point. As I have explained numerous times in this thread and to your staff in person in the shop the bike was ridden VERY carefully and at a modest pace. The bike was brand new and I was unfamiliar with it, so I was riding very conservatively, and hadn't even begun to explore its limits. Average speed on the rides where the chain broke was around 10mph, mostly on flat tarmac and almost entirely in eco+ and eco power modes. So the way the bike was ridden was not a contributing factor to the chain breaking.
Secondly, proper use of gears, again this a moot point. I have been riding double and triple chain ring bikes for well over twenty years. I was therefore already quite well aware that one should avoid using extreme gears and use an appropriate gear for the speed of travel and incline/decline etc. So again the way the bike was ridden was not a contributing factor to the chain breaking.
Thirdly, the only advice I received in terms of transporting the bike was before I purchased the bike when I asked if it would fit in the back of my car. And then when I collected the bike for the first time the mechanic advised me to always put a spacer between between the brake pads when the wheel is removed to prevent the pads from closing up accidentally - advice which I have followed to the letter. Having been a regular cyclist for years I am in any case no stranger to transporting bikes. In fact when I first collected the bike and I was putting it in the back of my car, with the help of your mechanic, it was actually me who insisted that it go in drive train side up to avoid any damage to it! Now I'm not suggesting your mechanic doesn't know that bikes lied on their side should always be drive train side up - two people wrangling a bike into the back of a car tends to be a recipe for miscommunication - but I mention this because the suggestion that the problems with the bike were in any way because of the way it was transported is just nonsense.
The reason for the two chains breaking, I strongly suspect, is that they were fitted incorrectly. To be more precise I suspect that the chain was too short and as such it was under too much tension and that is why I sometimes got phantom/double shifting and that is also why it snapped. The reason I suspect this? The third chain (the Shimano chain) was fitted the wrong way around and it was too short such that not all the gears were reachable and the gears did not shift correctly. The independent mobile bike mechanic who you sent to fix the problem confirmed this and was able to identify the problem immediately just on a quick visual inspection yet evidently your bike mechanic thought it was perfectly fine. So you'll forgive me if I think the problem was not the way I rode the bike or the way the gears were used or the way the bike transported but simply that the bike was not set-up correctly.