OMG I had an AR 50 with a 93cc big bore kit in the early 90's. Strange thing is it did not go as well as my AR 80 with just an All Speed exhaust upgrade. That revved to 14k rpm on the clock. Man I wish I still had them☹️

My friend used a ar80 gears in his 50 and then put the kit on top it was a real beast for a little 50 this was back in 1988 the extra gear made all the difference well impressed that these little bikes are still about

Wow that's a massive blast from my childhood(16yrs in '94 👍, i wish I could send you a picture of my ar50 it was an almost standard looking cylinder bore.. maybe skimbed once or twice.. had a coke can ar80 micron exhaust (really small). Plus some racing reed valves can't remember the make, it was also ported (none professionally but wow) with a K&N air filter/ jetted accordingly over tests, and multiple gears bought/ sprockets to get to where it would do 60mph at 8500rpm up hill and able to climb rpm, and around 65-70mph at 9000rpm on flat roads. No light fairing either, all my friends back then had Suzuki ts50's with urtizer 90cc bigbore kits( spelt wrong) and were fast but the ar50 of mine was better all round low torque/top speed and all through the range where the Suzuki was at high rpm only or at least for those particular bikes and setups. I also owed a ar80 at the same time and used to just change all the plastics and petrol tank over so the 80 appeared to be my 50🤣 the 80cc did around 60mph and struggled at hills until I put the ar80 micron exhaust on for my 50cc and changed some Jett's and sprocket's then 85mph, but was sold soon after. My ar50 got stolen in late 94 which broke my heart and young world ☹️ I can laugh now finally 🤣😭😭

That was one of my AR50's I lent them. I've still got the engine and pipe etc. I'll be putting it back in a bike shortly with a new digital ignition to see what we can get out of it. They would of reached 100mph but they didn't change the sprockets I left on it. They ordered different sprockets, but then the rider went off to university and the airfield was booked up, so it came to a premature end. 🙄 You will need longer barrel studs too, the 50 ones are too short for the autisa. 👍🏻

Very enjoyable watching these,my ar 50 was a 1984 bike I’m near sure and at 16 I bought the 93 cc kit,when I stripped the bike and fitted the big bore the piston hit the head, I took the head to a school friends dad’s business and he welded the head up and I spent nights sanding it into the shape I thought the combustion chamber should looked 🙈kept testing it with soldering wire until it turned over free,no measuring tools were used i fitted a ap 100 carb I’m near sure and a micron and the bike flew never missed a beat for two years to I bought a car

I had one of these in 1996 (white J plate) found out my dads friend raced one and I took mine to him. He ported the exhaust port, ported the intake manifold, did something with the slider in the carb, and gave me an old Micron he had laying about. Already had a 80 rear sprocket……did 55mph after a couple hours tinkering. Happy days.

I had an AR50 back in 1992, it was gutless but I loved that little bike, always thought they looked good as far as mopeds go. Also had the AR 80 but never got that on the road.

I had a standard ar50 in 1996 as my first road bike. It was so slow standard, 35mph top as I didn't have the finances to tune it. 26 years on and I'm tuning my 77cc Aprilia rs50 to reach 80mph, 74mph on gps is my highest top speed but I have a lot more planned for it.

I had a few of these, delorto carb 80 gear box, single piece exhaust, de-restricted cdi unit, big jet in the carb.. then just get the sprockets right.. from memory slightly bigger at the front and smaller at the back.. mine did 96/97 and I was 16 at the time🤣🤣🤣 I think I also kept 2 spare engines ready to go in.. hahahahah👍 good work though mate I’d love to find 1 to do up myself tbh…

I had one of these in 1989 Ar 80 top and sprockets fitted and a gianeli exhaust loved it

Great project Dave👍

I had the ar50 it was my first 50 and my last, fun bike but so small when your over 6ft2 you look like you on a kids bike , still enjoyed for almost a year , I then got the ar 125 what a difference , still a small bike but handled really well

Friend had the 50 converted to 80 and ran on methanol...was a rocket. Cops chased but neva caught him in the 80's on their 750 Suzuki bikes😂

Had an AR50 as a kid. I think it had a 14 or 16mm Mikuni carburator standard.

The AR50 restricted UK model had a 14mm carb... Also the ignition timing was fixed to 14degeees advance but the unrestricted one and the 80 were 20 degrees ... So you may need to modify the stator plate it use the AR80 one if you can get it. You may have already sussed this all out of course.. Also I would be tempted to nicasil plate the bore.

👽👍

you need the minarelli am6 2 stroke watercooled block . you then get a 2fast 100 cc head barrel and cylinder kit plus a big 2fast beefed up crank a 34- 36mm carb cdi ignition carbon reed valve and you got a genuine 100mph 2 stroke scream dream. its also a good idea to beef up the box and go close ratio.

....there is alwats billet cases/ internals/ top end. blowers and the grand daddy of obscene HP NITRO METHANE! best of luck n BE SAFE!

I had a 93cc big bore ar50 when was 16yrs, got 73mph out of it 😂

Hi, how's this project going? I had an AR50 in 1992, kept it at 49cc but a few mods meant 55mph and a ticket for speeding when I was 16 😂

You’ll want a 28mm carb

Matt at bdk has the fastest engine in the world

With a big bore kit and a new gearbox you should be laughing.

I had a Kawasaki AR 80 Standard everything else except , I got it tuned head skimmed and ported 2 mm , it would do 78 mph !!!!! would of gone much faster if I had changed the gearing !!!!

Is there a 90cc for an ar80?