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With 6 magnets on your sensor and the controller set to read 12 magnets, then your controller has to sample double the amount of pulses before it kicks in which is why you are experiencing the lag. What controller do you have?

Yes they do one. This is the controller that I think the op has, coupled with an LCD03 display: https://torquetech.co.uk/collections/controllers-lcd-displays/products/ebike-sensored-brushless-motor-controller-dc-24v-36v-250w-6-fet-15a-kt-sine-wave?variant=11815406403631

P1 and P2 depend upon the gearing of your motor and how many magnets you have for both speed sensing and number of poles. Do you know what make and model motor you have? Also display manuals are readily available on line and they explain most of the P and C settings, so what model display do...

I think your best course of action would be to part exchange your bike with Halfords against a Carrera Vengeance. You won’t get a particularly good deal on the part exchange and the Vengeance isn’t a particularly good bike and you won’t get the mid drive you have been craving for. But you will...

Have a dig around in your back garden. With luck you will find an abandoned WW2 Anderson shelter, so you can charge your battery up in there.

Talk to Halfords first before buying anything. Halfords hourly rate is quite high. Also create a new post on this forum to see if there are any bike mechanics local to you who would be interested in either fitting or better still supply and fit one for you.

He isn’t trying to be rude. He is actually trying to help. Bicycle maintenance is far more complicated than you think and does require mechanical skills and understanding. As well as owning and knowing how to use some special tools. As Nealth suggested, watch plenty of YouTube videos to try...

Just to add to your confusion and I haven’t read the entire post, but £350 budget is very small. A decent battery costs that much.

I just looked up your bike and it is a 21 speed with a 3 ring on the front. It’s also an ordinary hard tail MTB, so likely to have a 68mm bottom bracket. You need to measure it before buying the motor. The cassette or freewheel and chain can be changed later. The hard part is fitting the motor...

I think you should search around on YouTube and watch some videos to learn some basic bike mechanics. Special tools are needed to fit a BBS motor and to change the cassette, although if it’s only 7 cogs on the rear it’s likely to be a freehub. Maybe it would be better if you can find a local...

The very first thing you need to do is measure your bottom bracket using a tape measure or ruler. Then you can order the correct size motor for your bike. You may have a 68mm, 73mm, 100mm or even 120mm bottom bracket. A 68mm motor will not fit on a bike that has a 100mm bottom bracket. Here...

You are getting confused with the terminology. You keep saying chain when you are referring to chain wheel. The cogs are situated on a cassette mounted on your back wheel. For simplicity the more teeth you have on your chain wheel at the front, the higher your gear ratio is. And the more teeth...

He means the pas sensor disc that is fitted on the bottom bracket. The pas disc should have either 5, 8 or 10 magnets and this determines what to set the C1 parameter to. Also the disc must be very close to the sensor otherwise the hall sensor won’t trigger. Many people have problems in this...

Is it stuck in walk mode all of the time? If so then there is something else not right and the hall sensors may be ok.

Your Motor is a Bafang SWX02 The white hall sensor is for the speed sensor to the controller, which is unused on many motors. There are three other hall sensors soldered to the pcb for the phase signals into the controller. You should test them first as well as the controller before replacing...

You have no choice but to ignore the white wire for the time being as your motor doesn’t have a speed sensor fitted there is nothing you can do about it at the moment. You can always fit an external speed sensor if you can’t get the controller to work properly. KT controllers have different...

If you have a white wire, it’s for the speed sensor in some motors and temperature sensor in others. Some controllers don’t accommodate either. For the hall wires the usual colour combinations are: Red = +5v for all of the hall sensors Black = Gnd for all of the hall sensors Yellow, Blue &...

The “250w” motor has massive torque. It’s also oil cooled with steel gears. Specifications say it can handle a payload of up to 300kg. And a twin motor configuration at “125w” per motor with 226Nm total torque, the payload increases to 500kg...

Duralac is a horrible messy stuff to use. If you really must use SS fixings on an aluminium frame then you are better off using a corrosion block grease because it won’t clog up the threads.

Stainless steel screws and aluminium casings aren’t a good idea due to galvanic corrosion. The screw will rot away the aluminium and turn it into fine white powder.