WOW, you have really spent a lot of time working on this and thought it out.

 

How much does it owe you now?

 

I recenntly got myself a Chinese 250 in the frame of a PW80. Talk about wheel stands!

 

It could do with some re wiring and the fuel tank leaked, but its all good now!

 

Good luck with it.

 

PS. 50Kph on a scooter is pretty damn quick!

yeah only a fraction of the time that I spent on the exhaust alone in my car, I must be getting better at this.

 

Show us a pic of your bike, sounds like fun, I want to get 80km/h out of this!! hehehe

 

 

anyway costs; with the new engine and not including the stuff I will no longer use its tricky to work out but it goes like this:

 

I bought the original pocket bike for $140 or something, I used the wheels, driveline and rear fork. I will be selling the rest.

 

The fat boy pipe cost me $75 delivered I think, that also included a the fuel tank i am using now.

 

heres the engine:

 

engine with 19mm carby: $170

tripple stage reeds: $29

air cooler pipe: $35

2 spare gasket sets: $10

spare piston: $10

 

levers, some of the metal and frame I got for free

 

Some more of the cro-mo- $10 to 20?

 

thats all I can think of for now

another update: I finished my engine mounts, they are fully welded in and the engine is bolted up. Heres the rear mount:

 

 

 

 

 

I also finished the frame recess. To do this I put a piece of flat steel on top of my cut out, tapped it with a mallet, tack welded it, ground it one side, tacked it again, ground the rest, welded it all and then did the finishing grinding. A little bit of stuffing around but I love the result, I think it looks great. here it is:

 

 

 

 

 

and with the engine in place:

 

So whens the next track day? :dance:

sorry for not replying before for some reason I wasnt notified that I had a new message on here.

 

Anyway I will be looking to try and talk my way into getting on a track with the pocket bikes when the time comes, I think it would be a blast. However it will be a while before I will have the chance to do anything to get this thing runing as I have a fair bit on my list of things to do at the moment.

Hahaha how'd I miss this before, this f@$king rules.... I've got one of those foot scooters that I'd love to put an engine on, but don't have a welder etc... Top Work mate :)

Edited July 14, 200719 yr by Nitephyre

yeah thanks, i really want to get this thing going again. Man it was so much fun leaning over the handlebars with the accelerator and front brake on at the same time on my friends front lawn.

 

oooh also I have a really nice suprise....

 

 

 

 

 

its the real deal: a NOS nitrous kit, I will convert it to a wet system though.

mad f@$ker!! :evil: :D

I will take that as a compliment

well this thing is finally running.

 

The first time I got it going I went about 10 meters before I snapped a chain link.

 

I wheeled it back home and modified a BMX chain-splitter to split a link instead.

 

Back on the road I go up the hill near me and I accelerate a little and it just lifts the front wheel straight up and throws me off. Worried that I might damage the threads holding the exhaust I wheel it home again and weld a brace on the power pipe. Welding was difficult with my hands shaking so bad.

 

Back on the road once again I am really carefull and I find it will lift the wheel up a hill or down a hill, truly scary. While I am riding up a gavel path up a hill I accidently give it just a tiny bit too much power and it lifts up the front wheel and because it was an offcamber track it of course just steered off the track and down an embankment. After using my increadabile butt saving technique I stop myself getting too many induries and then go home.

 

At home once more my hands are shaking badly and I am left thinking "I have made a monster..."

 

Oh i love it

 

 

I will post a pic shortly and I have also managed to get this thing in action on film which I plan to upload soon to an online host, hehehehe

Sam, for someone with very little spare time, you have too much time on your hands. :D

 

carry on...

hehhehe well yeah.

 

As I often say: "I don't have too much free, I just have wrong prioritites"

 

 

 

in other news I called up the guy who sold me the engine and asked why fuel is leaking bad out of the air filter, he said the carby float is stuck in the up position. Which means that if this is right my engine in its current state has been running ultra rich and i wil get a big power increase when I fix the problem.... oh dear

I went for another spin, even at 60km/h the thing feels like its leaning back from the power, I think it may go up to 80, I need to get a speedo for this thing.

 

Also it broke down, it was spluttering at idle and I stopped for a moment when it just died on me. I don't know why.

 

well anyway heres a current pic:

 

the time has come....

 

Well quite a bit has happened,

 

- I had a faulty ignition coil which I changed

 

- Been doing heaps of reading and finding out what I should be doing. BY my basic measurements right now my intake ports are tuned to 6500RPM and 7000 for my exhaust. I will look to change this to 11,000RPM.

 

- I went for a spin and with my friend following me in his car found that my top speed is 70km/h, however it was the same up a hill so its purely rev limited. I measured the wheel and worked out I was doing 12,300RPM. With the mods I plan to do I hope to get it to 14000.

 

- I found that my engine has some massive flow restrictions in regard to the reed valves and the engine would of been tottaly straved of air at any decent revs, I will modify the housing to fix this.

 

- I did some porting of the chamber by opening some up, reshaping, smoothing and also deshrouding certain areas.

 

- I started working out the dimentions to 3 possible expansion chamber setups and started making the simplest first.

 

- I have chopped the frame in two and extended it whist at the same time starting a rebuild of the rear section.

 

Enough talk heres some pics:

 

 

 

Frame stripped down and ready for work

 

 

Chopped in half!

 

 

Extended with some Cro-Mo tubing, notice the slots cut into the front sections for me to weld through.

 

 

 

new pipes welded in place

 

 

An expansion pipe I am working on

Edited December 3, 200718 yr by Sam_Q