Fusinmotors Online Forums

Sorry you have had so many problems tmho. I have read your post several times. I must say I'm at a loss as to the problem.
I've got 1750 miles on my Fusin kit and 2200 miles and another kit and I've never seen your problem.
What battery do you have? C-rating is the amount of power that can be drawn from a battery. Maybe it's too low and shutting the controller down. It should only show itself during load. Test the voltage of the battery when running if possible if if goes below 44v under load then I believe the controller will cut off. The cutoff voltage was set high in these controllers to protect the battery I believe.
Check all connections. One loose one will throw the whole thing off. Sounds like you done this already but check again.
Look if all else fails the guys on this forumhttp://www.endless-sphere.com/forums/ discuss only electric bikes and some of them are electrical engineers.
Don't give up . We are riding experimental vehicles that are subject to unknown problems. I'll keep my eye here to see if I can help you with your problem.

Crash Machine wrote:Sorry you have had so many problems tmho. I have read your post several times. I must say I'm at a loss as to the problem.
I've got 1750 miles on my Fusin kit and 2200 miles and another kit and I've never seen your problem.
What battery do you have? C-rating is the amount of power that can be drawn from a battery. Maybe it's too low and shutting the controller down. It should only show itself during load. Test the voltage of the battery when running if possible if if goes below 44v under load then I believe the controller will cut off. The cutoff voltage was set high in these controllers to protect the battery I believe.
Check all connections. One loose one will throw the whole thing off. Sounds like you done this already but check again.
Look if all else fails the guys on this forumhttp://www.endless-sphere.com/forums/ discuss only electric bikes and some of them are electrical engineers.
Don't give up . We are riding experimental vehicles that are subject to unknown problems. I'll keep my eye here to see if I can help you with your problem.

Hi Crash Machine,
Thank you very much for your time in reading this post and your suggestion. I will sure follow your suggestion to further find out the problem. Will reply to you later hopefully after the holidays.

Hi Crash Machine and all readers, Happy New Year!
I finally got some time to try out Crash Machine's suggestion.

My battery is LiFePO4 battery from Fusin. It is 48v/10ah battery. There is a label with the words "Worldwide Electric Bike". I think they are selling the same type of battery to Worldwide Electric Bike.

Here are the data which show that the battery is normal as I expected. The battery's voltage was 53.2V before the motor was turn on. When the motor was running, the voltage dropped to 52.1V.

Let me briefly repeat my first problem. I got a front wheel kit and a rear wheel kit with geared motors from Fusin. But in "H" gear, when the highest speed of the "M" gear (about 35 km/h) is reached, the speed jumps suddenly to 45 km/h. No speed can be controlled and hold in between 35 and 45 km/h. Both the front and rear wheel kits have the same problem. According to Fusin Tigher, when the motor is with load (that is when someone is riding the bike), then there will not be such problem. I do not believe in him and so I do not want to risk myself by trying his suggestion. Do you (and other readers) have such situation in your e-bike when the motor is without load?

My second problem is with one of the two controllers after sending them back to Fusin for checking. With that controller, when in "H", when the maximum speed of "M" gear is reached, the speed drops suddenly back to the maximum speed of "L" gear. Fusin Tiger made a lot of unreasonable excuses to hide the problem of their product. Today, I opened the controller and found that one of the 63V 470microF capacitor is with bulging top. (Too bad I do not know how to post a photo showing this in here). According to some information, capacitor with bulging top is a defective capacitor. I will try to replace that capacitor and post the result later. Hope that will not be too long.