Tuning in 1978

Jeffrey Strichart /

My friends and I all made very fast mopeds back in the late 70s/early 80s. What we did was drill out the ports as big as we could, bore out the intake manifold and carburetor as big as we could (although I put a YZ80 carb on my Negrini), put in the biggest jet we could get, cut the piston so it would clear the new larger port, remove the air filter, remove the exhaust pipe entirely (more on that later) and of course we changed the gearing to whatever sprockets we could find. You must remember that there were NO performance parts back then and I mean NONE. We worked with what we had. No kits, they were all 50cc. That is all we did. We did not even know that they had timing to adjust! I would adjust the points to start opening a hair earlier than tdc. Now about the pipe. After a while somebody started to make a chamber pipe called a Proto Pipe. It was a slip on but we used to cut the exhaust manifold about halfway under the engine and clamp it there so the chamber was upswept. It exited around the seat height and looked cool as hell. Now the moment you have all been waiting for. These were all verified numerous times. I had a Negrini. They are vastly underrated. The frame and suspension were vastly superior the the Maxi's. I was clocked at 58. My friend Howard had first gen one speed Newport. I clocked him at 65 more than once. My friend Richard's Maxi looked bone stock but exceeded 60. Another friend Dirty Donnie claimed 70 but was never verified. All told at least ten of us went 55-65 and we rode in packs and passed cars. Of course off the line they were slow with those gears but the power helped once you started moving. All of this is true.

This is why I do not understand why, with all of the performance parts available today, we have mopeds that have been tricked out not even reaching what we used to get to. Of course some are but with WAY more performance that we could only dream of.

PS I just picked up a clean 1978 Maxi 1,5 and am in the process of making it go as fast as I can get it to so you will probably see me around here. And I want to thank you all for the huge amount of information that you put up. It is very helpful!

Re: Tuning in 1978

You can only make so many rpms before there is just too much heat for these little air cooled engines to handle

Re: Tuning in 1978

Mikey Antonakakis /

Will be interesting to see if you can replicate that performance, keep us posted.

The key to going fast is in the ports, do you have any more details on how you modified them? It would be so easy to just cut and cut and ruin them, so to actually just go into blind and end up with good results from stock cylinders is impressive.

A couple projects down the list is to see what I can get out of a stock V1 cylinder...

Re: Tuning in 1978

Josiah Radebaugh /

I would love to see someone replicate this! I

Re: Tuning in 1978

> Jeffrey Strichart Wrote:

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

> I was clocked at 58.

> My friend Howard...I clocked him at 65 more than once...

> This is why I do not understand why, with all of the performance

> parts available today, we have mopeds that have been tricked

> out not even reaching what we used to get to.

Maybe today's GPS is more accurate than yesterday's "clocks".

Re: Tuning in 1978

I'm not convinced that you could get high 50's/low 60's with pretty much stock everything (especially the crank), there's a reason you don't see stock "builds" like this and it's because they're 99% a figment of imagination looked at through rose colored nostalgia glasses. Even if you were able to build a 50mph ped on mostly stock components it would probably accelerate slow as shit and suck to ride.

All I'm saying is if it was that easy to do everybody would be doing it and there would be almost no aftermarket. So if it's that easy to do let's see one!

Re: Tuning in 1978

Overpriced Parts /

> Jarod V. Wrote:

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

> I'm not convinced that you could get high 50's/low 60's with pretty much

> stock everything (especially the crank), there's a reason you don't see

> stock "builds" like this and it's because they're 99% a figment of

> imagination looked at through rose colored nostalgia glasses. Even if

> you were able to build a 50mph ped on mostly stock components it would

> probably accelerate slow as shit and suck to ride.

>

> All I'm saying is if it was that easy to do everybody would be doing it

> and there would be almost no aftermarket. So if it's that easy to do

> let's see one!

Yep I’m from that era and you’re full of shit !

Re: Tuning in 1978

Bump for some stock master tuner guru knowledge.

Re: Tuning in 1978

Like what speeds are the stock tires and brakes rated for?

Re: Tuning in 1978

Until they blow....

Re: Tuning in 1978

Jeffrey Strichart /

I am telling the truth. That's what we did. It wasn't a big deal. I will do it again and then you will see. I am starting a build thread so you can see how I do it. It's not that hard. BTW I did not start this thread. I posted as s reply on another thread and someone posted it as a new thread but it was not me. So say what you will.

Re: Tuning in 1978

> Overpriced Parts Wrote:

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

> > Jarod V. Wrote:

>

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

>

> > I'm not convinced that you could get high 50's/low 60's with pretty

> much

>

> > stock everything (especially the crank), there's a reason you don't

> see

>

> > stock "builds" like this and it's because they're 99% a figment of

>

> > imagination looked at through rose colored nostalgia glasses. Even if

>

> > you were able to build a 50mph ped on mostly stock components it would

>

> > probably accelerate slow as shit and suck to ride.

>

> >

>

> > All I'm saying is if it was that easy to do everybody would be doing

> it

>

> > and there would be almost no aftermarket. So if it's that easy to do

>

> > let's see one!

>

> Yep I’m from that era and you’re full of shit !

All you have to do is show me one.

Re: Tuning in 1978

Next you’ll be telling us is that you were riding doubles.

Re: Tuning in 1978

We were doing that here in CanadaLand while riding doubles...

...with Justin Trudeau...

...while eating a bowl of poutine...

...up hill...

...against the wind...

...on icy roads in July...

...with moose chasing us...

...in the dark...

...while snowing heavily...

BUT SERIOUSLY FOLKS

Back in the 1970s tuning was a different creature than it is today. No conveniences of just jumping online and getting some help from a cast of a thousand goodly moped folk. No suppliers where you could just 'click to order' parts and pay for it immediately.

Lots of cobbling things together and bastardizing a moped with what ever larger engine you could find. Lots of trial and error (sadly a lot of error). Lots of visiting scrap yards to find anything made of bent tubing so perhaps you could fabricate a larger header or intake. Checking out machine shops and coops for sources of chain gears to get a couple of tooth advantage for speed. Learned a lot about NOT just hogging out ports while trying to port a cylinder.

City folks would be reworking their bikes in order to sprint from one stop sign to the next and dodge traffic, those of us out in the country went for the higher speeds at the cost of fast launching... and everyone was jealous of two speed, twisty-shifts and doubly so with variated bikes.

I dont know about the validity of the original posters speed claims, but I can tell you it was a lot of challenge but also a lot of fun 'back in the day'

> Boot 2Thehead Wrote:

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

> Next you’ll be telling us is that you were riding doubles.

Re: Tuning in 1978

I've been wanting to build an old school tuned maxi for a while now, just never came across the right bike. It'd be sweet if you made a build thread when you get started.

Re: Tuning in 1978

♣Slew Foot♣ /

Firstly where you in New Jersey? And back in the seventies everybody knows the air was full of lead from the gasoline and the atmosphere was a lot thicker and the planet was cooler of course it ran faster...mmm

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