50/50

I went to the Toledo event last Sunday and got a tour of their bikes. One of them was a V1 and was described as a 50/50, or a 50 cc bike that can reach 50 miles per hour. As a Motron fan, I was intrigued at the possibility.

Anybody else have a V1 50/50 and how was that obtained? Bigger carb, better pipe, altered sprocket setup?

A bike kitted with everything BUT a bigger top end?

Re: 50/50

the cool 50/50 guys do it with all stock modified parts

Re: 50/50

Overpriced Parts /

50/50 is very cool and if you have other bikes I suggest you have/make one with modded stock parts but taking stock parts to the max may not be the greatest for a daily driver,

The most I like to take stock parts to still be very reliable with minimal maintenance as a daily driver is low-mid 40s mph (tomos and puch) for the more metal you take out of the cylinder and or piston, running one less ring, big carbs, big pipes increasing rpm etc. makes for more wear, hotter temperatures, high maintenance etc.

Neither is ported, only simple mods and have stock carbs, the puch has stock pipe but the tomos has a cheep 60$ chamber, both are big heavy mopeds (magnum and revival) with a 200 lb rider

Re: 50/50

I like 50+mph/50cc on variated bikes with stock top ends. If you port them right they'll beat most kitted bikes without porting. It's really fun to rip on very ported reeded stock jugs, they are super cheap to play with and usually pretty durable.

On single speeds (especially with piston port) it's much more difficult to do, as with the gearing you need to run to get to those speeds can hurt your takeoff and slow hill climbing.

Even ported well, stock 49cc jugs will always go slower uphill than kitted just because of the torque available from the extra displacement.

Re: 50/50

Thirty years ago, I took my first Motron, which already went 30 mph with just an 11t on the front, and replaced the rear 44t with a 36t. This brought the speed up to 40 mph on level and downhill. Everything else was stock. At the time, I wouldn't have considered any other mods. I'm not sure many were available back then, either.

Re: 50/50

Richard Eberline /

Roff man is correct, very unstable motor. It is a ticking time bomb. To get a stock Motron over 40 mph, you need to go downhill with the wind at your back. Also the speedometer is as accurate as a Michigan weatherman. Your call and add a couple mph to the total.

Re: 50/50

Stock V1's are pretty easy to hop up. The intake port is tiny, and there's a lot of room to open it up. Same with the intake manifold.

I had the 19mph version, with the intake hole smaller than a dime. Grinded it out almost twice the size, welded a new intake and used an 18mm mikuni. Modified a ktm 50 dirt bike pipe and had 10-36 gearing.

It'd hit mid forties easy. Slow off the line and uphills, though.

Never ported the case and jug, but that woulda got me into the 50s. Probably.

But it was too easy to just slap a polini on it and get instant satisfaction.

If there was ever a 50/50 spec race, I'd dive into it a bit deeper.

Re: 50/50

OOOH good opportunity for us to get a brag in!

I've been close a bunch of times. 2 heavily modified e50 I took over 45, 1 was an a55 cylinder, both ported and modified heavily. Port and build specs're on garage I think http://garage.1977mopeds.com/build/Clint%27s+old+maxi

I've had 2 hobbits also get close, on stock carb too, notched vario, except the pipes it was all just modified stock shit and they'd rip but again peak just over 45

My 2 speed sachs D would top out regularly dead on at 46. I had a regeared honda cub 4 stroke 3 speed 50 that I topped out at 46 too. Still that last 10% always escaped me.

But the only true 50/50 I had was totally cheating because I didnt do any of the go-fast engine work.

It had a basically stock morini s5, with a stock dirtbike pipe (hack/welded to fit) and a phbg19. I had that topping out over 50, fastest gps was 53. it screamed too, hell on the clutches but holy fuck it was fast and tiny.

Re: 50/50

Also I think typically speedos (at least cheap moped ones) are based just off a spring and calibrated to the max speed, usually 30 or 35. So zero's zero and you set it to read 35 at 35, and it's pretty accurate in between, but becomes farther and farther off outside the intended range. Then you've got tomos folks like "holy shit it's wrapped around past 45!" but really are maybe going 38

Re: 50/50

> Born to be WillD Wrote:

> -------------------------------------------------------

> OOOH good opportunity for us to get a brag in!

>

> I've been close a bunch of times. 2 heavily modified e50 I took over 45,

> 1 was an a55 cylinder, both ported and modified heavily. Port and build

> specs're on garage I think

> http://garage.1977mopeds.com/build/Clint%27s+old+maxi

>

> I've had 2 hobbits also get close, on stock carb too, notched vario,

> except the pipes it was all just modified stock shit and they'd rip but

> again peak just over 45

>

> My 2 speed sachs D would top out regularly dead on at 46. I had a

> regeared honda cub 4 stroke 3 speed 50 that I topped out at 46 too.

> Still that last 10% always escaped me.

>

> But the only true 50/50 I had was totally cheating because I didnt do

> any of the go-fast engine work.

> http://garage.1977mopeds.com/assets/images/builds/12226/de87e9d6d2ec94b758db0e71b72caba1.JPG

>

> It had a basically stock morini s5, with a stock dirtbike pipe

> (hack/welded to fit) and a phbg19. I had that topping out over 50,

> fastest gps was 53. it screamed too, hell on the clutches but holy fuck

> it was fast and tiny.

Big fan of the bmx style, i remember when you first built that. I wanna build a bmx moped now

Re: 50/50

i have got close on a peugeot with the super cheap 50cc cylinder. (pretty much a stock euro cylinder) stock tsm pipe and sha 15.15 i was getting 46 on the flats but broke 50 on some hills more than once (using phone gps)

same bike and cylinder with lots of vario tuning a phbg 19 and polini sport pipe i can hit 50 on a flat and almost 55 with a hill

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