Restriction / Govenor Fun Project Help Needed!

[blackpowder]

Hello Im new here  


My bike is road legal and gets used most of the time just to get around on.
But being employed at race track has its perks, one being free acces to the track.


Here is the problem:
I will like to keep using the bike as a go getter on the road, and that means it has to be legal (atleast when doing so)
But I will also like running unstricted, on the track after work

So I'm looking for a way to make it temporary legal when Im on the road, and then with relative ease being able to derestric it, to enjoy living

I will like to make the govenor/ restriction externaly controlable, to avoid doing any dissasembly each time I use it on the track. Which will be almost every day, so it has to be easy to do and undo.


I was thinking a posebility could be to install a remote controlled relay that could switch between two cdi boxes? one legal and one thats not dont know if it would work? 


Keeping legal on the road means it can maxium go 21 MPH!!
The Diy restriction should not catch interested eyes
Im up for anything, electric or mechanical.



The engine :
72cc zongshen 139fmb
ac cdi
19mm carburetor

any suggestions will be greatly appreciated.

[aeroxbud]

Welcome to the forum.
Isn't it already illegally modified if it's 72cc? 🤔

[FrankenMech]

Mark your speedometer and don't exceed the legal speed on the road.

[GrumpyUnk]

I do not know of any that are restricted to 21mph. I suppose it is possible.

If you cannot exercise your self-control and keep the throttle closed to travel 'legal' speeds, then you could 1)change the belt so it can't go fast, 2)change the weights or 3)adjust the throttle cable so it will not open the throttle all the way. There is a 'barrel' adjuster on most near the handlebars that can be adjusted to add or remove slack in the cable control.
tom

[blackpowder]

The problem is really not my right hand getting heavy
But here in my country the cops roll with a portable dyno in trunk.
The limit on the dyno is 26 mph.

All good suggestions, Do you guys think it will be possible with remote controlled relay.
If there is nobody around, I maybe need to get home a little faster.
And I would be able to activate the limiter from a remote in my pocket, if the lights turn blue.

[FrankenMech]

Use an electric solenoid throttle stop with a hidden/remote switch. You don't need any of the high price racing products. Just an old fashioned idle stop solenoid from back in the 60's, and 70's. They were used to give a higher idle speed when the AC unit was used and also to stop run-on when the engine was shut down. A DC solenoid from an electric supply company will do also.

[GrumpyUnk]

Portable dyno... wow. Something must have happened to make them that interested. From what I gather, here in USA the officers tend to look the other way as slow scooters are a hazard to the operator and to other drivers. They tend to get in the way of faster moving traffic, causing drivers to have to maneuver to get around them, or to act rudely, and forct the slower machines to the side of the road. A faster machine can blend with other traffic, making the officers job easier and making traffic 'happier'.
That said, I had the idea for a 'barrel bolt' type limit added to the twist grip. When things get plue, move the barrel bolt into position to limit throttle rotation. Otherwise, retract it and go about your drive.
Adding a throttle stop to limit butterfly shaft rotation in the WOT direction would be a little harder to implement than in limiting the idle stop position. It would take something getting in the way of the throttle shaft rotation. A stop solenoid placed 90 degrees could extend and block the throttle, but would require power to operate, and would have to be powered whenever someone wants to do a dyno test. I think.
tom

[aeroxbud]

The police have a portable dyno to test scooters here too. They had it at the local collage a couple of years ago. Testing all the mopeds!

There are a few different adjustable rev limiter boxes available. The drawback is they limit revs, not speed. So with a CVT it's not so effective.
If you limit the opening of the variator. This would restrict speed. Think restriction ring, but bigger.
It would take about 10 minutes to remove.

[FrankenMech]

The police obviously have too much time on their hands, time to put a limit on them and fire a few.

[blackpowder]

Maybe the solution is a mixture of two things.

I heard someone close to the police, talking about how they always listen for the scooter to hit the rev limiter.
Being its only a 72cc the restriction doesnt have to be crazy to pass as legal.

So maybe a cdi with limiter around 8000rpm and some kind of throttle stop, that can go noticed by a searching eye.
Also the throttle stop cant be crazy limiting or they know something is up, when they cant turn the throttle more than a half inch

[GrumpyUnk]

By what authority to the police pull scooters to the side of the road for a 'dyno' inspection? Unless there was evidence of some activity that was illegal, motorists should be allowed down the road without, WITHOUT interference.
OTOH, if you make a clown of yourself, that's another story.
It may be that campus 'police'(are they actual sworn LEOs?) may have been tasked by the college administrators, absolutely ignorant of the actual law, to pull scooters over on any whim they can imagine. I do not see how they can examine the working without probable cause. College 'administrators' have a history of ignoring legalities they think do not apply to them because they are 'on campus', but the rights of everyone still obtain, even on campus.
Students may just comply to avoid a hassle.(and expulsion by the staff/admin apparatchiks who take lessons from HOA operation) in becoming dictators. end rant
tom

[aeroxbud]

Jul 24, 2021 10:35:22 GMT -5 GrumpyUnk said:

By what authority to the police pull scooters to the side of the road for a 'dyno' inspection? Unless there was evidence of some activity that was illegal, motorists should be allowed down the road without, WITHOUT interference.
OTOH, if you make a clown of yourself, that's another story.
It may be that campus 'police'(are they actual sworn LEOs?) may have been tasked by the college administrators, absolutely ignorant of the actual law, to pull scooters over on any whim they can imagine. I do not see how they can examine the working without probable cause. College 'administrators' have a history of ignoring legalities they think do not apply to them because they are 'on campus', but the rights of everyone still obtain, even on campus.
Students may just comply to avoid a hassle.(and expulsion by the staff/admin apparatchiks who take lessons from HOA operation) in becoming dictators. end rant
tom

Here it had nothing to do with the collage. It was an operation run by Hampshire police. This is how it works.

[blackpowder]

Yup, thats what it looks like
Funny, I was talking to a buddy of mine yesterday, about the same subject.
But here in denmark the cops have the right to pull you in without a reason, and just calls it a "routine check".
Being that nearly all mopeds are ilegal from factory, they tend to stop almost everyone.
Its not like people riding scooters rolls with a piece under the seat.

[aeroxbud]

It's the same here. I was trying to find an old post on a motorcycle forum, of a girl who got stopped on a stock aerox. It was fully stock, but got taken by the police as it was doing 35mph on their dyno. The father was asking advice, who to go to, the police, or dealer.
It's a joke. My typhoon was so slow when I got it, it was dangerous.

[FrankenMech]

Revenue enhancement.