drewpyfz6

Hi,
I have purchased some toy grade 1/5th scale rc bikes - Nasaki and Winyea



The first came from the Uk, the second is the exact same model, but from the US and has slightly different stickers.
Think they are very closely related to the Nikkon bikes too...

Was not sure what I was buying at the time - noob.... but were pretty cheap.

They run ok and have a moving rider to change direction, as per the Hyosho HOR.

The main problem with them is, the throttle and steering are pretty much on or off
So you have to blip the throttle to get a steady pace, and as you can imagine, steering is quite jerky.

What I would like to do is replace all the electronics for something better.
Have progressive throttle and steering responses.
Then would look at replacing the rather hard tyres.

I am going to start stripping one of them down this week, to get an idea of the size of the parts inside.
Need to measure the motor mount and (motor) 'can' diameter before ordering replacements,

If anyone who has already built something of a similar size and type had any suggestions, recommended parts etc, they would be very gratefully received.

Many thanks in advance.
Drew

drewpyfz6

The strip down has started - quite a lot of little screws in this thing and working out what to undo first... lots of fun.

Ok, pictures time.

Stage 1: Got the rider off and the front fairing.


Stage 2: removed one of the side panels


Stage 3: have access to the rider movement mechanism


Stage 4: have access to the servo


Stage 5: separated frame from swing arm


Stage 6: reusable parts 1


Stage 7: the frame definitely has potential


Stage 8: the body is nice - similar to the Yamaha R1 or R6 from 2007


Stage 9: all the reusable parts


Stage 10: all the parts destined for the bin...

Looks like a decent sized motor should fit the drive mechanism
The standard motor is 4cm x 3 cm diameter.

Sure I have seen a brushless one that is very close to this size, will have to dig through my many parts boxes.
I bought a BL for flying thing and never go around to using it, so may be able to give it a new home.

There is plenty of space for a decent receiver and esc.
Also could probably open up the bottom of the frame to house a 7.2v 6cell battery. Or a small 11.1 lipo....
We shall have to see.....

Does look promising....

Captain Nemo12

Nice start so far! Please keep posting pics of your progress! I might do this with a toy bike someday.[8D]

drewpyfz6

Thanks Captain Nemo,

The model cost just £25 delivered... pretty cheap.

My motor is ordered.... along with electronic speed controller

Will keep posting progress pics - ;o)

yaleforscale

looking good drew , it can be done ,, here is some inspiration bro . check out this guys videos , he has oded a couple of toy grades two .. ...[link]http://uk.youtube.com/watch?v=TCk6nbzQzgA[/link]

drewpyfz6

Thanks yaleforscale,
I have already watched the Ricky Carmichael brushless upgrades he did - good work.

Still waiting for some parts to arrive - got a Kyosho HOR motor today, but its too small, 20mm diam.
May need to get a 370 size motor?

It needs to be 40mm x 30mm - diam, if I can get one. The 540 motors are 40mm diam, so am hoping the 370 is the size I need.
Otherwise may have to mod the mounting.

yaleforscale

i understand drew i think that guy in the video ended up moding the motor mount , but you may whant to look at these motors the very strong and lots of sizes hope this helps bro ....[link]http://www.cornwallmodelboats.co.uk/acatalog/graupner_motors.html[/link]

Captain Nemo12

One question, is the chain drive functional or simply molded on?

drewpyfz6

Its rather badly moulded on.... [&o]

Cheers and thanks for the link, will see what we can find.

EDIT- motor ordered

drewpyfz6

Update:
Got some of the parts today.

The motor arrived from www.Cornwallmodelboats.co.uk - thanks to Yaleforscale
Have to the Gaupner 400 7.2v

And its a perfect size match for the original motor.

This will partnered with the Ansmann VR18T from www.goldstarstockists.net.


Plent of room for this, just need to decide where its going to live.
And if I can squeeze in a 6cell 7.2v battery.

Hope to get some work done installing and testing soon.

Edit:
Need to either source a 9T 2.3mm pinion, or get the old one off the original motor...

Managed to order a 10T and 9T pinions for a few UKP's

Guidoracer

Just be careful of the gear train. If it is anything like the Tyco or Nikko bikes, all the parts are plastic and aren't made to withstand much more than the stock motor. So go easy on the brakes (you want to anyway, since as soon as the rear locks up, it will fishtail and fall down) and if you get any air, don't yank on the brakes, because as soon as the rear wheel touches ground, you very well may end up with a bunch of shredded teeth.

Good luck, and let us know how it goes.

Lito

drewpyfz6

HI Lito,
You are correct - this is almost identical to the Nikko bikes, but with a road based body shell and lights.

The drive train is all plastic gears, so can see what you are saying.

I am initially going to gear with the 9T pinion, as that is the same as the standard one.
And was thinking more around having a drag brake, if I can disable the reverse on the esc.

Once its working (if it does), I may look for some metal gears to replace the nylon ones in the drive train, so that would be better.
Inside the drive housing, it could be possible to change to belt drive, but might be beyond my ability. And may struggle to get parts that fit.

Cheers,
Drew

yaleforscale

looking good drew , these motors can be overvolted with no problems . that speedo looks the same as the mtronicks , if so they can take a 9.6 input voltage . that should speed things up a little , these toy grade normally have plastic bushings if you can replace them with steel roller bearings the drive train will withstand a lot more abuse . . i know this from experience, ...i have done the same thing to toy grade newbright trucks , .you might want to try this guy for bearings very good service , if you dont see what you want email him . and he will do his best to help . cheers bro ....[link]http://www.rcbearings.co.uk/[/link]....

drewpyfz6

Hi mate,
You are spot on - it is the mtronicks speed controller. Was going to try using 7.2v first, so I can use other batteries that I already have.
But do have 3 of the 9.6v standard ones that came with the model (the Gaupner motor is rated at 7.2v).

Just waiting for the motor pinions to arrive, then can get some soldering done and start to test things.

I am also going to weight the rider with wheel weights, should help with direction changes.

What power servo do the riders usually have?
I have a couple of 9g aircraft ones, wondered if these would be Strong enough, or should I use car steering servo's?

yaleforscale

i dont think you need a powerfull servo for this drew a standerd should do the job , i see no reaso why you carn,t use the aircraft servo good work bro .

drewpyfz6

Ok, will try it with the smaller servo's first.


Still waiting for some last bits to arrive - got the pinions now.
Almost ready to start rebuilding.

Teknoron

Drew!!!!
Just ran across this article, kind of wished I saw it before I purchase one of these bikes off of eBay. Any updates on this project? Just got mine in so haven’t had but a few minutes with the cycle, can see right off the bat how lame the controller is, one thing I will definitely change will be the radio and ESC. Let me know how you made out or if you canned the project. Thanks!!!

drewpyfz6

Hi Teknoron,
The project has been on the back burner, a death in the family and sorting out a crawler took precedent.

I do have all the parts I need to move this on and hope to be able to do some work on it very soon.
Will provide a better update soon.

Just adding esc and receiver should make it better, I didn't like the 'on/off' of the controls.

And the rider from my second (spares bike) is going on a TTE..

Teknoron

Was able to “drive’ the cycle this weekend. Did take a little getting used to, then the radio decided to switch on me, luckily with the dual turning knob I just flipped the radio around and drove it that way, then it would switch back. Tried replacing the batteries but that did not help. So I have decided to replace the radio and ESC. Have not tore the bike down yet, was wondering the size of the servo used to drive the bike? Standard or is it a micro servo?

drewpyfz6

If you look at the picture above 'stage 10', the big white lump is the combined unit that is also the servo.
So should be able to take a normal sized servo.

I have a few small aircraft servos and 10th scale car steering servos. But have not tried any of them yet.

Will be starting the rebuild very soon, got my solder and new bullet connectors arrived today, so should have everything to get started.
I am going to try the standard motor first, with the new electronics.

Hope you get yours working better.

PS, I didnt like the switchable standard controller - is pretty lame.

Teknoron

Thanks, really interested to see how a real radio and servo will work, the stock seem to have about a 20ft range.

drewpyfz6

Using a standard car, 2 channel receiver, should give the same range you would normally expect.
I am going to use a HPI 2 channel controller, at least initially.

Should get better than 20ft...

Teknoron

Yeah my wife was falling over laughing watching me try to drive it. Started doing pretty good then the radio flipped on me and right was not right anymore.

drewpyfz6

Ha, its great when you get good support from family...

Did not even attempt to drive my bike outside, just tested in house and decided it was not good enough.

Dont like the 'on/off' of the controls, steering and throttle.

Will start assembly tomorrow night and post pictures as we go.
My Mrs is away visiting family, so should have time to get some build done. - and no one to laugh...

drewpyfz6

Double post - deleted