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I didn't manage to do amp testing today, as sparky was closed but heres an email I've sent to Oset, based on the fact I'm using both Lithium ion, LIPO and SLA in diff bikes I can rule out the battery I think. Bikes are EM 5.7, Oset 20 eco 2014, Oset 16r 2014, Oset 16 2012 (eco) start email I did some more testing on all the bikes today up on stands. EM - smooth progressive acceleration, smooth deceleration Oset 16 2012/ china smooth progressive acceleration, smoothish deceleration BUT..... Oset 16R 2014 - smooth acceleration but when you back off throttle, it doesn't stop the wheel spinning, it continues flying until you get the throttle back to zero and then boom, its stops (this has a lithium battery) Oset 20 eco 2014 - using lead acids, same throttle response as the 16R. This is why it is jerking so badly as effectively there is no deceleration from the controller or the throttle, the kids have to back it right off to slow down, which kills the power completely to the motor, then reengage. I was curious to why the wee boy on the 16r kept jerking the throttle of and on and not being smooth with it. now I know. Does this sound like a faulty controller or throttle you either of you?

Hi. I meant 100 amps sorry. At full power from a start with me on it won't cut out. In fact I can't keep the wheel down. The cut out is not under power just when you back off the throttle. No demand for power = instant kill of supply. That's with the throttle on the stop. When you throttle on again it engaged fine. However engagement speed is lower than rolling speed hence the bike brakes like engine braking. What this means is if your not gassing the bike then it's jerky at low speeds.

The bms is not tripping. If it does battery dies and key needs to be turned off. As the controller is rated for 20 - 100 watts (Oset doc) im surprised you say 60 amp continuous isnt enough? 60 amp x 54 v = 3 kW to a 1200w motor. Peak over 5 kW at 100 amp less system loss. Seems a heap for a rider and bike weight combined of 60kgs.

Hi GUDAH and GWHY more info on the battery. Its lithium ion, 48v 20 AH. Discharge after testing is constant 54v and 60amp with a maximum amp cut out of 100amps. I cant ride it on full power without flipping it. This should be more than enough, perhaps to much for the OSET controller but we haven't had a cut out yet. So its not an underpowered problem I believe. I'm trying to find out if the EM throttle would be a good starting point to get rid of the dead spot (my EM throttle is so smooth) and then looking at a throttle response option with a Kelly controller that is usb programmable I wont look at the motor until we go down that route unless you have any other ideas? The oset guys said they could put a 2015 map on my 2014 controller but I reckon I might be better to just put in a Kelly at $159 usd that I can map myself love to hear your thoughts......

Question. What is the current needed for the motor?

Over current is 10amps. Battery guy said if it trips then bike will shut down. He feels that controller is not up to the instant power and on off nature of lithiums. I'll run some tests with battery tomorrow and check amps and volts out of controller. One thing we saw was that there was an instant supply of volts on and then off with Li vs much slower with sla

hi guys, the battery has a bms. It runs constant 54v so a little high, the result is it makes the bike fly. I haven't checked amps but will do tomorrow. When I put the lead acids in the bike behaved normally, so I am convinced its not the motor but a power delivery problem that the oset controller is not dealing with. I have spoken with Kelly and they have a controller that you can program via a PC. You can set the slow speed and high speed for both ACCELERTION and DECELERATION. I'm thinking that by modifying this low speed DECELRATION it may stop the cut out then cut back in again when you are doing throttle off, throttle on trials. Cost is $150 USD so not a major. Here is the info sent from Kelly, appreciate your feedback In this case,I will suggest you use our SPM48151 controller for this motor. The SPM controller can provide smooth control. You can adjust the acceleration or deceleration rate in the user program of the controller. We added smooth control in the user program. It is used to set up the throttle map by customers. The deflection point will divide the low speed and high speed on the throttle map. We added the smooth control parameters in the user program. When you enable the smooth functions,you will see five more parameters. You can adjust the low speed acceleration and deceleration rate,and high speed acceleration and deceleration rate in the user program. The inflection point is at the joint of low speed and high speed. But this new software version needs the new firmware and hardware to support. Usually you can set deflection point at 10. Low Acc rate is 100 Low Dec rate is 127 High Acc rate is 100 High Dec rate is 127 The deflection is used to define the point for low speed and high speed.We assume the max inflection point is MAX. For example,if we set up the inflection point at 10,we think the range below 10/MAX point is low speed area,the high speed range is above 10/MAX. When you adjust the inflection value,you can determine which point is the joint for low speed and high speed range. Different motor or motorcycle will affect the value of MAX.I can not let you know the accurate rate. So we can accelerate and decelerate the motor at low speed range and high speed range. Low Acc rate is Low speed range acceleration performance rate.If the value is high,that is to say,the controller will accelerate the motor very fast at low speed range.If the value is low,the acceleration is slow or gradual. Low Dec rate is Low speed range deceleration performance rate.If the value is high,that is to say,the controller will decelerate the motor fast,the motor will stop quickly after throttle is released. High Acc rate is High speed range acceleration rate. High Dec rate is High speed range deceleration rate. The explanation is the similar as above.They only just located on high speed range. You can assume the value is just the response time.There is no unit for the value.Sorry for that. Different motor,cars will provide different results under the same value. You need to tune up the parameters according to every vehicle data in real testing. 　

righto, its not the motor or the throttle but looks like the controller not working well with lithium batteries. Below is an email to Oset that explains what is happening, I'd love some advice on controllers from you more technical guys out there........... Good thing - LITHIUM has super fast delivery of power, a solid 54 v from resting, this means a very snappy acceleration that can be tamed via the throttle response switch. Problem - as fast as the power is delivered it is cut off. This means that via the controller output to the motor, the voltage goes instantly to 0. The effect on the ride is that in effect the engine instantly disengages then when you twist on the throttle, its is instant again albeit at a very low voltage and hence reduced speed. In effect a huge and choppy lurch forward, then backwards. Unrideable at slow speeds. I did some testing of the of the SLA's and they have a lower voltage but also a much slower ramp up and run down of voltage from the controller to the motor. The ride effect is a much smoother acceleration and deceleration / reengage of power. Solution - this is the tough bit and I'd love to hear from Oset or Oset riders as I know hundreds have converted to lithium and will have addressed this. In my mind, the controller needs to be programmed to have a gradual ramp up and gradual ramp down of power when the accelerator is engaged but importantly disengaged. Also, a residual voltage when throttle is zero should be evident (will result in a small battery chew) to keep the motor live.

I've just ridden the bike again. Power normal on twist of throttle.... Usual lG etc. Let off throttle and normal coast. No engine braking. Then when you twist on again it's like the motor is engaged but at a slower resistance than the roll forward and you lurch forward. In other words the engine seems to disengage completely then re- engage with twist on but at a slower than coast speed. Really lost......

Hi. So the lag you think is related to the controller? If I reduce throttle response on the controller it's really laggy.... Then on deceleration the motor all of a sudden engages and the boys lose balance. It's like the motor turns off? Really weird and a nightmare for balance trials.

Hi. Can you recommend a throttle that is more linear and doesn't have such a lag? I'm confused whether to get a hall or a pot throttle...... Some recommend the Magura throttle. My em 5.7 has a super nice feel so ill ask if that unit is compatible. Thanks for the help guys.

I love my 5.7 sport. I ride it in mainly urban areas, skate bowls, parks, urban forest etc. People always stop me and want to know about it and never do I get a negative reaction. I can also ride with my kids on Osets and its always quiet. I haven't had a problem with hill climbs at all but am only intermediate level trials.

hi, thanks for the reply. So did this throttle lag / engine braking problem stop with a change in motor? My bike is only 4 months old so I would be surprised if the motor has packed up already........

I just installed a pico. Plug and play and set it in the middle settings. My boy is how reag happy. This is with a 20Ah lithium battery. Works better than the new R model osets on power delivery. Put the unit between the frame with zip ties at front of the bike. 5 min job And no experience needed.

Hi guys. I've installed lithium ion on one bike and lipo on another.oset 20 2014. Both cut out and then there is a delay then they are off. Only when throttle off and coasting. Makes riding slowly almost impossible. It's like all of a sudden full engine braking from elecmotor. Any ideas. ? Cheers