Search results

I still think that if you can keep it dry, Bosch Gen 2 is one of the best motors built to date. It's built like a tractor gearbox inside and uses mostly tried and tested vehicle components in the electronics. The PCB is mounted at the top of the motor, so it's not sitting in the water if any...

This diagram is from the Instinct Powerplay Carbon. The bearings fit the same as most ebike motors, where the bearing fits into the machining space for it in the motor housing. Although this protects the the bearing seal to a degree, it does not stop the water traveling along the impute or...

Ish.. We do find that the water comes through the bearing into the motor housing, as it does on the Brose etc. Sadly there's not one seal on the Rocky Mountain, but I do agree with what you're saying. The drive chain area is pretty well shielded, but the bottom bracket bearings are pretty...

I have to agree the Rocky Mountain is a powerful and user serviceable motor, but it too is not sealed. They rely on just the bearing seals as most other motors do.

Although I know a lot about grease, I would not consider myself an expert so can't really comment on this choice.

It's probably not the best stuff in the world! But it's known to work without problems and it's what Bosch recommend.

Half the motors have a re-usable silicon sealing bead. The others usually use an RTV silicone sealant. But as I said earlier, no motor will let water in through the gasket faces, it is always through the bearings.

It depends on what it's made from? Most marine greases are aluminium based and when they come into contact with lithium based bearing grease, it turns it back to oil. This is why many boat trailer wheel bearings fail because people just pump a load of marine grease on top and their normal grease...

Agree 100%

99% of all water ingress on all motors is through the bearings, not the gaskets or wiring seals etc. Brose have some issues on their earlier motors with water entering by capillary action along the wiring, but this is mostly cured now.

Your motor should already have these bearing shields fitted and they should be changed from time to time. I would definitely fit a new set going into winter and using the Bosch "tacky" grease, re pack them every 2 to 3 months depending on terrain, cleaning habits and riding conditions.

We have not yet played with a PW-X3 so can't comment on the sealing and parts may not be available for this motor as Yamaha are trying to do the same as the other manufacturers with regards withholding the information required to source the parts and not releasing the latest parts.

Just one drip in the wrong place will do the job if you're unlucky, but that's the same with most motors. Yamaha, for example, are one of the few who do put a liberal protection coating on their PCB's but it does not really help. Yamaha's PCB's are also at the bottom of the motor, so water...

You can remove and coat the board, but the big problem with the Gen 4 is that Bosch have used the motor body as a large heat sink, this puts the electronics close enough to the motor casing to sort out when a drop of water gets to this area (see image below). Unfortunately, once a little water...

We thought the Gen 4 was going to be a fantastic motor, but now they are out of warranty we are being swamped with them! There is a few difficult technical issue to get over with calibration etc. But because Bosch put the PCB at the bottom of the motor, any significant amount of water will kill...

Yeah, we looked into doing this because a lot of older bikes, the parts and motors are becoming obsolete. Unfortunately, you would also have to change the battery, battery holder, switch and looms, etc. Its just not economically viable.

Bafang have done this, you can buy all the internal parts for your Bafang motor and they are slowly gaining traction in the mainstream market.

As I said, this is not a question I can answer! It's not because I don't want to answer it, it's because it is far more complicated than it sounds and ever changing. I will do a video or talk on this sometime this year. I feel that both the motor and battery issues are extremely important to...

I knew I should not have written that statement when I wrote it! These questions sound so easy when you ask them, but I have struggled for two days to answer this so far! This is also one question I am trying to get the media and motor manufacturers to ask me, or just speak with me, because...

As it said in my post, this is data that we have painstakingly kept and gathered over the last 5 years of fixing motors. It's not publicly available yet and has never been posted anywhere. But we will speak with #h3rrm later in the year and see if we can put something together.