Yamaha CUXI 264cc dragbike by SBL

最爱小羊

Been a while since i have been on here, mostly because i have been busy with other projects and dealing with a few rather large orders.

But fear not i am delivering on my promise on showing some the fastest small 4 stroke scooters on the planet!.

I will copy and paste from the zuma forums:

Ok, this isn't actually my bike, it belongs to a rather large fella called ray from guam, he asked me to help build him the worlds most crazy yamaha cuxi!.
Now this means nothing to anybody outside of taiwan, so let me give you a quick history lesson and maybe i can spark some interest in this project

In the early ninetys we had 50cc 2 strokes that weighed about 70kgs, of all of the brands and models, 2 of them stood out from the crowd:

honda dio and the yamaha jog

There has been many variations and updates of these bikes but mostly they have died out, 2 strokes are almost no more, yes we still get some in japan and europe but the fact remains that they will cease to exist in about 2-3 years time and in most other countrys they have been replaced by 4 strokes.

So that brings me to taiwan which is the scooter capital of the world, the scooter companys had a serious problem when the goverment banned the 2 strokes a few years back, they had no way of producing a 50cc 4 stroke that would be fast enough or as tuneable, so the companys put pressure on the goverment to raise the entry level cc to 100cc.
So for us the 100cc is the new 50cc.... is this making sense so far? (we do still have 50cc 4 strokes but most people here dont bother with them and its mostly for exporting).
The point is that this engine will be sitting in your scooters of the future, maybe as soon as next year!.

Anyway since tuning was such a large part of these bikes the 100cc engine in the yamahas was designed to be super lightweight and also able to tune and boy oh boy did yamaha get it right!.
The CUXI is not the only bike in yamahas range with this engine, its just this one was chosen as it was the rarest and most stylish of the lot.

all the 100s on the link below have the engine
http://www.yamaha-motor.com.tw/motor/motor_main.htm

ok, ok lets get one with this bike:



I was sick so i couldnt get a before picture of when we bought this bike in, so heres yamahas official picture, this is the EXACT bike we started out with
The plan is to make this into a drag scoot, the rear end is to be lengthened by 20/25mm but otherwise the bike is going to almost look stock, obviously it will have full on RRGS front and rear ends, i wont spoil you with pictures of those yet .

So below are pictures of the bike stripped naked with the engine out ready to get a bigger hole put in (laymans terms there, its way more complicated than that!).
Every part in this engine is a pre release special, its going to have the first RRGS CNC 73mm piston and 13mm stroker crank, this will make it the fastest 100cc scoot in the world......if we get it setup right!.
I cant quite get the calculations right but the CC is at least 270cc and is more likely 283cc (i cant find the stock stroke for it online).

Heres the spec to be:

73mm RRGS big bore kit with ultra light CNC piston
13mm RRGS stroker crank (first ever!)
RRGS handmade quiet exhaust system
RRGS transmission
34mm KEIHIN CVK carb
RRGS 26mm USD forks (ultra low)
RRGS CNC rear shock
RRGS 20mm CNC length extender (crap i forget the actual techincal term!)
RRGS 220mm disc
RRGS radial caliper
Stock bodywork
HID light and led indicators
RRGS uprated started motor
uprated electrical system and special CDI
Chromed 9 spoke lightweight RPM wheels
KOSO instrument cluster

Did i mention that it will do 100mph and hit 60 in under 4.5 seconds and be used on the road?.

Next post please......
_________________
www.samuraiscoot.com
Supplier of the very best aftermarket scooter parts.

check out my CUXI!!!
http://totalruckus.com/phpBB2/viewtopic.php?t=27817

Dynojet wanted, anyone know of any?
It didnt take long to get the stock 100cc motor out and rebuilt with the very best performance parts.
We just removed the back end and sent it down to RRGS headquaters down in tainan shin, which is one of the most beutiful parts of the country, its so nice i had to show you a few pics from a previous visit as i didnt have my camera at the time

In super hi-def so i have to link to them:

http://i193.photobucket.com/albums/z269/smellybumlove/guam%20RRGS%20factory/DSC_1998.jpg
http://i193.photobucket.com/albums/z269/smellybumlove/guam%20RRGS%20factory/DSC_1997.jpg
http://i193.photobucket.com/albums/z269/smellybumlove/guam%20RRGS%20factory/DSC_1999.jpg
http://i193.photobucket.com/albums/z269/smellybumlove/guam%20RRGS%20factory/DSC_2009.jpg

ok back on topic, the bike was put back together again with everything stock but the engine, quite insane to test ride it with no front brake and crappy tyres and suspension, but it had to be done!.




Ok heres the engine and CVT, what you can see here is some CNC cooling fins on the top end and a CNC oil pump with fins attached, all to help aid cooling which this bike NEEDS!.



The CVT uses all RRGS parts, it may look standard by i assure you its not!.
The variator was originally a polini, but we ended up binning it and using the RRGS one instead, it just wasnt taking off as well as we wanted it to.
The clutch is a RRGS and the bell is RRGS, the bell has a special heatproof compound on the inside and also has holes drilled in to help cool it down some more.



Stretched out as far as it can go with RRGS CNC alloy, looks trick doesnt it?



another view from the rear, you can see the muffler from here, thats all handmade specially for this bike to harness all of the power possible (they spent a week testing and building!) its not exactly pretty but it works very well.



porno shot of the top end




next post please....
_________________
www.samuraiscoot.com
Supplier of the very best aftermarket scooter parts.

check out my CUXI!!!
http://totalruckus.com/phpBB2/viewtopic.php?t=27817

Dynojet wanted, anyone know of any?
This is where things start to get exciting
Suspension and running gear, all super trick and very special!.

USD forks installed, now i do sell these but not at that height, usually they have more travel for road bikes, but since this is a drag bike....



Rear shock, this is the very best one money can buy, it has rebound,compression and preload adjustment, a super firm spring, shortened travel, 15mm stanchion thats nitrate coated and CNC machined head.......wow a serious mouthful!.




Side view of the forks, here you can see the diddy radial caliper whic is CNC alloy, it weighs almost nothing and is a proper 4 piston brake so it actually stops very well!.
220mm floating disc, we went small on purpose to keep weight down.



RPM radial lever, between you and me it uses another well known brand names piston and same bolt sizes.... its a really nice bit of kit and i use the very same one on my BWS100.



The stock fuel tank is heavy, so we replaced with a small 3.5 litre alloy tank, cant go very far on it but less weight = good.


After all the running gear was installed we started to do proper testing with the engine, we hit a major snag after about 20kms of abuse!.

Basically the bore was so big there wasn't much metal left on the cylinder, it got so hot that it started to crack, that really pissed me off as that meant we needed to go down 2mm to 71mm




But not to worry as after replacing with a 71mm piston, we had the bike revving to 10,000rpm+ and it was actually going faster after about 100kph.

Thats when something else went wrong!.

The top end we used was a stock cygnus 4 valve which was heavily modified with huge valves, but they werent quite big enough to flow what this engine needed, so we needed something special.
I dont have a picture of it but its called a HER2 and cost a crapload of money to get made, we had 2 done just in case the 1st one broke.
After installing the bike made even more power!.

So we took it for a proper shakedown test, problem was we had nowhere to go, the huge car park what we usually test at was closed for some kind of building work, so we had to drive out of the city.
We found a nice long quiet road between the bullet train and highway, we took RRGS's old GY6 dragbike along with us for comparison.

We were having quiet a giggle, the engine wasnt over heating or even coming close to its peak temperature (we ceremic coated the cylinder and head) and it was faster after 60mph/100kph than the dragbike with just a slower start due to the different carbs used on each bike (CVK-CUXI, PWK-GY6).
After about 10 mins the cops came and tried to confiscate both bikes, everybody was claiming that the bikes belonged to me (thanks) in the hope that the cops didnt want the hassle of dealing with a foreigner, good job as it worked, they just told as to leave and never come back




-extra credit if you can spot me -


Well thats it, the bike was working 100%, now its just bodywork and lighting.
95% finished in these pictures, we are still ironing out a few electrical issues caused by the HID.

Special 9 spoke lightweight wheels, they were chromed and i think they look stunning.
RRGS CNC stem and handlebars were installed, you can also see the ACCEL rear brake lever hidden there.





We are so proud of this engine we had to stamp our mark somewhere



6000k 35w HID, yes it works and is damn bright!.



Had to do a small mod to fit the shock on, looks almost stock!.
Also we have a clear tail light with LED lights, right now they are white but will be changed to red soon.



If you see this bike for the love of god get out of the way, it may look cute but i can assure you its an animal!.



Ok i will update with some artyfarty pics with the DSLR next week and possibly get a much better video in the day time.

Next post for the vids...

-Angel-

绵羊也疯狂！~~~~~~~~~~~~~~~~~~~~~~~~~~

卿卿摩托

千轮机车又一力作。。

似乎见到了我们的恩师 王庆洲 是也。

杨炀

王庆洲 改的车我开过 两台。

daxing99

转让04雅马哈车玩125一辆~（株洲凌鹰发动机）最低8.5成新！！此车行驶5千多公里~因闲置半年多~放置储藏室受潮等原因~油箱出锈迹已漏油~电瓶因时间久肯定已坏~在其余部件都刚刚的~百分百{没拆 没换 没修}发动机刚刚的没的说了。。。。当年怎么贵的车~谁也不忍心伤害~放置期间 发动机 机油 都换过1次~~
现在油箱 已拆 进行焊补中。。。。外壳没装 ~正好可以方便验车~联系QQ125422918

282205

好车，好帖，顶一个！