Throttle issue with a Wisper 905SE and advice on water proofing the control box void.

[Paul Newport]

Hi

I've got a Wisper 90SE which I've had for a year now and is therefore out of warranty.

I've had no end of problems with this bike and over this time have had a new control box, new battery and new rear wheel fitted, plus intermittent problems with the hi-lo switch (solved by drying it out and covering the switch in a freezer bag!). I'm pretty fed up with the bike to be honest.

My latest issue is that the twist grip throttle only seems to deliver just enough power to turn the rear wheel when the wheel is lifted off the ground. I've checked that the connection to the control box isn't loose but other than that I'm not not sure what could be causing it. Any ideas ?

As an aside how do people water protect the control box and all the associated wiring from water ? I was quite amazed that the design off the 905SE allows water and mud in to the compartment in which the control box is housed, via a nice large whole at the front. Is it best to seal this up ?

 

[Blew it]

Hi Paul,

You've certainly had more than your fair share of problems with that bike.

Even though your machine is outside the warranty period, I suspect David Miall, MD Wisper Bikes, will pick up on this posting.

In the meantime, it wouldn't hurt to try to solve the problems you are now experiencing. This is not easy, as the Wisper 905 has evolved rapidly as a result of constant improvements to the machine...but I'll give it a try anyway.

Regarding the speed available on the throttle. Your controller may have two grey wires coming out of it. One grey wire goes directly to a 2 pin connector. The other grey wire goes to a 5k pot ( a little metal can with a screwdriver slot in the end ). Another grey wire loops from the 5k pot to the other pin of the 2 pin connector. This 5k pot adjusts the speed of the machine when ridden on the throttle. I think It's possible dampness is effecting this potentiometer. Spray some WD40 into the screwdriver slot end of the pot, and then rotate the plastic screw from max to min several times to clean it's track.

With the bike upside-down, and the throttle wedged fully open, the wheel speed should vary as you adjust the pot. I'm not sure about this, but I think turning the pot fully clockwise will give the maximum speed ( but it might be the other way round ).

Reference sealing the controller housing against water ingress.

The reason the housing is not sealed, is to prevent the build up of condensation. When the machine is working hard, the controller naturally gets quite warm and requires air-flow to keep it cool. If my memory serves me right, your machine has a rear-facing air scoop on the underside of the controller housing. If this is correct, then yes, you can seal up the front cable entry hole.

To further help with preventing any future problems. Each connector in the controller housing should be disconnected, given a good shot of WD40, and then re-connected. Do them one at a time to avoid mix-ups.

I hope this may be of some help.
Regards
Bob

 

[Paul Newport]

Thanks a lot for that Bob. The bike is all screwed back together for my first ride back into work this year, so I'll look into things at the weekend.

I don't think that the pot is present on my version of the bike - I saw a post in the forum showing a picture of that and it didn't correspond to what I have. I'll post a picture next time I open it up.

WD40 - will try that too

 

[rog_london]

Paul:

The warranty on a Wisper is two years. If you're having problems please get in touch with them. Their after sales service is legendary.

Rog.

 

[banbury frank]

Hi Paul

As Rog says don't panic Wisper will look after you there customer support is Fantastic

Please Give the forum up dates on your progress

I am sure David from wisper will be in touch

Frank

 

[Mussels]

I don't remember any problems with the controller getting wet when I had a 905 but I don't remember a hole being in the front of the housing either. Could there be a bolt missing?
Water causes strange problems when it gets into the connections, could they need drying out some more?
My 905 was older and the controls have changed so I can't be more specific.

 

[Wisper Bikes]

Hi Paul, sorry to read about the issues, I have put an investigation into action to find out what has happened here and if we aware of your bike problems.

I need to know where you bought the bike and it's serial number, would it be possible to furnish me with this information? As you can imagine this is quite a rare occurrence, we sell 1000's of bikes every year and get very few problems, so to read of so many on a single bike is very distressing, I can understand your frustration!

As Rog says, if you bought the bike new you have a two year warranty so please don't worry we will sort you out. If it is an older model, again please don't worry, we have a good stock of all spare parts for al our bikes going back seven years now.

Having re-read your post are you certain the bike is only just over a year old? We covered the hole under the controller housing with a half cone several years ago, please would you check to see if it there? The half cone has the larger diameter hole facing the rear of the bike to create air movement over the controller to keep it cool and dry, either this has come off, was never there or the bike is an old one.


Half cone

All the best

David

 

[Wisper Bikes]

Reference sealing the controller housing against water ingress.

The reason the housing is not sealed, is to prevent the build up of condensation. When the machine is working hard, the controller naturally gets quite warm and requires air-flow to keep it cool. If my memory serves me right, your machine has a rear-facing air scoop on the underside of the controller housing. If this is correct, then yes, you can seal up the front cable entry hole.

I hope this may be of some help.

Regards
Bob

Thanks a million Bob! It is great to see the forum working so effectively and owners helping others to find solutions to problems.

The rear facing scoop is what I refer to as the half cone. It is probably best not to block the front hole as this helps draw air over the controller to remove condensation and keep it cool.

Thanks again for the superb post, you are spot on on every point!

Best regards

David

 

[di26]

Hi Paul, my bike is acting just like yours and I do not have the two grey wires and the box with the screw. did you get your bike fixed, what was it? thanks Di

 

[Wisper Bikes]

Hi Di

Do you have a Wisper bike? If so which model do you have?

Best regards

David