The 50

[F5 Dave]

I'm impressed.

I was aiming at 17 for the Derbi but second cut only got 14.6. But the head is rubbish shape in a rush, and I don't know why I left the ports so conservative all those years ago (sat unfinished for close to a decade). RG was only 14. Less towards the end as ovalised a bit.

[speedpro]

[QUOTE=richban;1130917492]So now I have joined this 50cc arms race. . . . . .
There is not a 4 stroke left in the shed. The transformation is complete.QUOTE]

Carrying on with a certain tradition I'm expecting the first thing to do would be to fit an 80cc kit to the 50.

Welcome to the side of goodness and light by the way.

[richban]

[QUOTE=speedpro;1130917534]

So now I have joined this 50cc arms race. . . . . .
There is not a 4 stroke left in the shed. The transformation is complete.QUOTE]

Carrying on with a certain tradition I'm expecting the first thing to do would be to fit an 80cc kit to the 50.

Welcome to the side of goodness and light by the way.

Ha ha thanks Mike.

Nah no 80 kits for me. Really keen to go nuts with the 50. Or should we say 53 ;] New stock cylinders are super cheap. The cast ones anyway. Also the Ali versions are too bad. But looking at the low res images you can see why they are quite cheap.

Anyway Ignitech on the way, FOS pipe on the design, push the comp and the revs, What could possibly go wrong.

[richban]

I'm impressed.

I was aiming at 17 for the Derbi but second cut only got 14.6. But the head is rubbish shape in a rush, and I don't know why I left the ports so conservative all those years ago (sat unfinished for close to a decade). RG was only 14. Less towards the end as ovalised a bit.

Just put it on a different dyno!

[mr bucketracer]

Just put it on a different dyno!

14.6 is the most i'v heard off , dave is a master

[cotswold]

So now I have joined this 50cc arms race. Actually its back to where it all started truth be told. First bike ever was an MT50 second bike GT50E. Me Bro had a 50E bucket.

Anyway Back to the question I was going to ask. What is the best HP anyone here in NZ has got from there 50? anyone ever had 18hp? See as I am not very light I figure 18hp would be just the ticket on my new RS50. So that is the goal. I will post the disappointments as I go. Maybe I will start a new thread for the build.

There is not a 4 stroke left in the shed. The transformation is complete. NSR300, CAGIVA raptor 125, RS50 and TF/RS100 project. Oh god what happened to me.

You have evolved

[TZ350]

14.6 is the most i'v heard off , dave is a master

Team ESE have dynoed a few 50's when I can find the original posts I will paste them below.

Fixer 13.6 hp

The ESE boys might have only half a clue, but it's a good half. And they have a functioning dyno now. With the addition of a small aluminium plate to raise the barrel, a small mod to the exhaust manifold and a little fiddling with the ignition timing, my Aprilia RS50 with it's Conti pipe and Doppler top end has gone from 10hp to 13.6hp. Woo hoo! Evidence below:

Attachment 297225

Cotswald touching 14

Thanks Tee Zee for letting me put the 50 on your Dyno, ... happy with the nearly 14, could you post the graph for me as I forgot to take a photo in my haste to get home and strip the bee atch.

Sure,

Attachment 310162

There you go.

Gigglebutton ... Av gas Red line, NOS Blue line.

Attachment 237930Attachment 237929

After a bit of a thrash on the dyno....... Red is the old curve, Blue new.
Well worth the hours worked on it. Next step a better ignition. Thanks guys

Buckets4me 14hp

Attachment 288388 Attachment 288389

There are a few F5 projects on the go, this is Buckets4me and his RG50. And as far as the Team goes, his pretty much sets the bench mark.

NedKellys 12hp

NedKellys 50.
Attachment 294606Attachment 294602

11.0 red line is Ex opens 87 deg atdc duration 186 deg and Frits pipe.
12.0 blue line Ex opens 81 deg atdc duration 186 deg and Fritz pipe.

[cotswold]

https://www.youtube.com/watch?v=46zTXbTM8ZA

the onboard is taken from a classic 50 meaning it runs very skinny wheels and tyres but check out what can be done with a KTM cylinder on Ron Ponti cases with disc valve, 22bhp rocket ship.
I pinched the clip from the Free tech boys

[Bert]

https://www.youtube.com/watch?v=46zTXbTM8ZA

the onboard is taken from a classic 50 meaning it runs very skinny wheels and tyres but check out what can be done with a KTM cylinder on Ron Ponti cases with disc valve, 22bhp rocket ship.
I pinched the clip from the Free tech boys

Bloody hell... Lucky he has corner speed issues; else he'd leave them all for dead.

[richban]

https://www.youtube.com/watch?v=46zTXbTM8ZA

the onboard is taken from a classic 50 meaning it runs very skinny wheels and tyres but check out what can be done with a KTM cylinder on Ron Ponti cases with disc valve, 22bhp rocket ship.
I pinched the clip from the Free tech boys

Oh man that thing is fast. Sounds so good.

[TALLIS]

Take the straight out and he would be dead last, but I don't think it's in anyway the bikes fault! Geez it hauls

[cotswold]

Take the straight out and he would be dead last, but I don't think it's in anyway the bikes fault! Geez it hauls

He's limited by his wheels, very skinny tyres, old school brakes and 70's chassis

[richban]

Thanks Tim for letting me post here. This could be the start of a really great 50cc tuning resource.

So Here is a pic post race day on the little fatty.


It handles really well this bike. Its just heavy and the stock suspension needs some love. They have a rather funky subframe arrangement that house's the rear shock. I have chopped the rear of the subfrtame and will chop the rest after I have made a new shock mount mini steel sub frame that I will hang an Ali seat / subframe off. That should loose a lot of weight.


Next will be the wheels. They are way heavy so will fit the super light 2.5 and 3 Marvics I have. That should be good for almost 10kg.



That should get the weight down. So now for some more power. Looks like pushing the barrel up 1.5mm will put the transfure's at 115 and the exhaust close to 85 degrees.




I found this scooter pipe I brought ages ago to go with a 70m kit for my little commuter. After a quick measure I think I can get it very close to the Frits Malossi Pipe. So that is the plan untill the bank allows me to sort a new ali cylinder and some tools to port it. I will post up results as I go. Might be a we while as the Suzuki series is about to start and I will be busy riding this thing.




Oh an one last pic. First 50 bucket back in 1987ish. It had a full fairing and slicks. It never really got used. Maybe once at Bay Park.

[kel]

Sorry for the delay Tim, insert now drawn just need you to confirm you're happy with the spigot measurement and we are good to go

[cotswold]

Sorry for the delay Tim, insert now drawn just need you to confirm you're happy with the spigot measurement and we are good to go

That old head was optimised by TZ for a pretty good squish so that would be fine as a template.
Thanks Kel