Bosch Motor Servicing

 

Bosch Motor Servicing Prices

• Classic (Gen 1) $895

• Active Line (Gen 2) $895

• Performance Line (Gen 2) $895

• Performance Line CX (Gen 2) $895

• Active Line (Gen 3) $895

• Active Line Plus (Gen 3) $895

• Performance Line (Gen 3) $895

• Performance Line CX (Gen 4) $945 (currently not being serviced)

• Upgrades (Gen 2 only) Mudstop $68.50, Crankshaft Seal $25.00

• Bosch Gen4 Crankshaft Upgrade $450, or $250 with the service

​

For all Bosch ebike motor models... Gen1, Gen2, Gen3 and Gen4 Performance Line servicing.

1. All internal drive train parts removed for cleaning and inspection

2. All drive train bearings will be removed and replaced with original or better

3. New seals, O-rings and circlips fitted

4. Where parts are found corroded, failed or worn beyond acceptable limits, the owner will be contacted to discuss options and pricing

5. Specialist greases are applied to all relevant surfaces and parts to maximise protection from water ingress and wear Motor is reassembled and tested

6. Optional upgrades for Bosch Gen-2 motors with the installation of the Mudstop and additional crankshaft seal

​

Frequently Asked Questions

Does my Bosch motor require regular service?

Bosch motors are not designed to be serviced and should only fixed if they start to fail. The motors are sealed for life and if kept dry will do in excess of 80,000kms without problem.

​

My Bosch motor sounds a bit rough, should I just keep riding it until it stops?

No! If you can hear your motor is noisy while riding, it’s already too late! The bearings have failed, the balls within the bearing will be wearing rapidly; as they wear they get smaller, this causes the seals of the bearing to be lifted from their seat’s allowing water or dirt straight into the motor! All ebike motors fail like this when the bearings are in distress, and it’s a cascading effect. Don’t ignore any change in noise level from your motor, there are limits to what can be repaired.

​

Why do the bearings fail, are they bad quality?

The bearings fitted to most Bosh motors are extremely good quality and well sealed, but although a bearing is classed as “sealed” it is not waterproof! They are at best water and dust resistant. This is the same for 99% of the ebike motors on the market.

​

Why don’t they seal ebike motors against water and dirt?

It would be very easy to seal a motor during design stage, but seals add drag and drag equals battery consumption. It would be commercial suicide for a manufacturer to release a motor that achieved 1 km less battery range than their competitor.

​

My motor is creaking, are the bearings failing?

Bearings tend to rumble, grind, crunch intermittently or seize. They don’t generally creak. Creaking is usually caused by one of the following:

• Loose motor bolts. This causes the aluminium motor body to creak against the aluminium frame.

• Seat post creaking in the frame (most noises travel down the frame and emanate from the motor area).

• Crank arm loose

• If spider and chainring fitted, (Gen 3 and 4) check chainring bolts

• Pedal creaking

• If fitted, suspension linkage creaking

• Rear wheel axle loose

 

Can I get any extra seals for my Gen 4 motor?

The crankshaft and left-hand crankshaft seal can be upgraded with the Bosch Gen4 motor (refer the Bosch Gen4 Reliability Upgrade page for more details)

​

Will fitting a tuning dongle damage or wear my Bosch motor?

We have never seen any damage caused to a motor by the use of a de-restricting device.

​

What can cause damage or wear to my motor apart from water and dust?

We see slightly higher wear rates in motors used with low cadence in high gears, so the motor is spinning relatively slow but trying to add full power. Pedaling at higher cadence (rpm) is definitely better and more efficient for the motor. Damage can be caused by pedal strikes and crashing, but that’s about it! Motors are generally very resilient if looked after.

​

When should I get my motor serviced?

Bosch motors are not serviceable items and if kept dry will last for thousands of kms.

​

Can I get more power from my motor?

Currently, no.

​

Can I change my motor for a newer model?

In some cases this would be possible, but not as easily as it sounds. Motors can differ greatly from one model to the next; size, crank type, mounting bolt size and position, wiring plug type and position etc. These can all change, along with compatibility with older batteries and controllers. If you get over these issues, then aligning the chain, crank height, crank position fore and aft etc. Then you have chainring size, gearing etc. Normally, at the end of the day, it’s currently cheaper and easier to buy a new bike

​

Bosch Generation Motors Explained

All Bosch motors are very different internally. When diagnosing or quoting for repair, it’s important for us to know exactly which motor you have. It’s very common to believe you have a Gen 3 motor when you actually have a Gen 2, Hopefully this page will help you correctly identify your motor.