2 stroke motor pushbikes

[Godzilla]

That was always the argument with EV's, reports i was reading stated that pedestrians had a much higher chance of being run over by a EV due to their silence.

EV builders were taking about fitting speakers that played noise so people could hear them coming.

[admin]

That was always the argument with EV's, reports i was reading stated that pedestrians had a much higher chance of being run over by a EV due to their silence.

EV builders were taking about fitting speakers that played noise so people could hear them coming.

Yeah, thats what mine has, it plays 2 stroke engine noises and can " make smoke " to warn people I am coming as well

It even stops better now I have connected the front brakes I can now go and stop fast.

[Godzilla]

Weirdos bike customizations. (sorry mate, just could not help it)

[ame=http://www.youtube.com/watch?v=BmQv9wKSbl0]YouTube - ‪Pimp My Ride sketch from "Bec Hill in: If You Can Read This, My Cape Fell Off"‬‏[/ame]

[Godzilla]

It is quieter with a few k's on it though than it was new

Thats only because your slowly losing your hearing from the 2 stroke engine.

Ive contacted the seller, will be going over next week to view the kits, completed bikes and may possibly buy 2 kits depending on the feeling i get, if this works he will sell more kits.

I just found out he is around the corner from where i work now.

[Godzilla]

I have spent the evening thinking about how to get the power of the 48cc kits down to a legal 200watts (easier to do than with the 66cc kits)

As a side note, the engines marked as F80 are not 80cc, they are 66cc and produce 2500watts of power.

I also stumbled across a place in QLD that looks like they have restricted the 48cc engine to under 200w and have fixed a so called compliance label stating so.

Ill bet the owners just point to the professional looking plate when pulled over by the boys in blue.



Im thinking a restricter plate between the carb intake pipe and head with a small hole drilled in it will restrict air flow and therefore limit the power.

Could be the answer to making one legal however im sure a dyno printout would be needed to substantiate the claim thats its legal.

So here is the question.

How the fvck to you dyno 200watts?

It would be embarrassing rolling up to a performance dyno workshop on a bicycle. LOL

[tagg]

yes it would be nice to know how they do dyno these small engines

Tagg

[jok11n]

yes it would be nice to know how they do dyno these small engines

Tagg

they do make dynos for motorcycles, likely they (or any that actually are at least) are done on an engine dyno rather than a chassis dyno, if at all, probably more like a theoretical guess or the figures provided by the owner of the real item that they copied

[tagg]

yes it would be a engine dyno, i have seen homemade setup for gokart engins that maybe able to mod for these 49cc motors.

Tagg

[Godzilla]

So far it looks like go kart places could help.

Youtube has some inertia dynos doing the job.

[ame=http://www.youtube.com/watch?v=HSFJ2hUnMLw]YouTube - ‪Small Engine Dyno In Action‬‏[/ame]

[ame=http://www.youtube.com/watch?v=25_Ci1s-Rrw&feature=related]YouTube - ‪Inertial dyno - first full speed trial‬‏[/ame]

Now here is the other part.

Is it 200w at the crank or at the wheel?

If its at the wheel im sure power could be higher than 200w to compensate for drive line loss.

Edit; plans to build your own small engine/motorbike dyno.

Edit 2; software is $700 to buy after you build it.

[weirdo]

They do make dynos small enough for that God.
Back in Amsterdam we had the coppers using them to check mopeds which they suspected had been 'souped up' on the roadside.
Overthere it's legal to ride a moped at the age of 16 with an engine capacity of no more than 49.9 cc's and speed limited to 40 kph.
Needless to say there's a big market for aftermarket parts for the boys to 'tune up' their engines.
Boy there were some great bikes there, like Zundapp and Kreidler (both german brands) and Puch, Peugeot, Suzuki, Yamaha, Honda, etc.

[Jaz808]

I put one of those 2 stroke engines on a bike for my dad over 2 years ago, a few months later they had a dual brake lever for front and back, easier than trying to brake and clutch at the same time
I didnt think they still sold 2 Strokes, i thought they changed the law

I didnt read all the thread but i did see the 200watt power limit
26cc 2 stroke = 200watt
31cc 4 stroke = 200watt
200watt = the power of a fit adult
Thats was the rules on Vic Roads 2+ years ago

So i stamped my dads 49cc as 26cc

[Jaz808]

If you want a legitmate 31cc road legal motor thats pull start with centrifugal clutch,
So no pedal start and drop the clutch, and no holding that tight clutch in at the lights ect,
then go for a Black Star 4 Stroke 31cc and belt driven, Black Star might be dearer but better quality and no fines

[Godzilla]

Wow, 26cc 2 stroker is 200w.

Where did you get that info from Jaz?

Yes its pretty easy enough to just drop a restriction plate in after the carb, the hard part is working out the size of the hole while on a dyno and testing it.

Once you know the size of the restrictor it would be easy enough to sell the complete bike as street legal with dyno sheets to support it, all the owner has to do if they want to go quicker is just remove the plate at their own risk.

[Godzilla]

If you want a legitmate 31cc road legal motor thats pull start with centrifugal clutch,
So no pedal start and drop the clutch, and no holding that tight clutch in at the lights ect,
then go for a Black Star 4 Stroke 31cc and belt driven, Black Star might be dearer but better quality and no fines

Hey Jaz, if you look down the list in that link to point 11, they discuss a restricter or throttle limiter to make it legal here.

Looks like even a 31cc 4 stroke is over the limit. LOL

[Jaz808]

Yeah i seen that Godzilla about 31cc being over the limit,
i got those figures from the Vic Roads website well over 3 years ago might even be over 4 years ago, my son had a 23cc scooter, and i had checked the site, its not on thier site now, but i told my son way back then he is lucky as 26cc 2 stroke was the limit and 31cc 4 stroke

Here is another forum where someone says the same thing about 4 strokes

[Jaz808]

I had the Vic roads bicycle and scooter rules as pdf file on my old work computer

[nando]

How about a rev limiter that will cut spark once a certin RPM is reached to keep it under 200W? Then you could always eaisily switch it on/off when needed.

Cheers,
Nando.

[Jaz808]

I have just searched and searched my old pc hoping i had a copy of it here
I also searched Vic roads and all thier links, Victorian Law Today, Victorian Government Law Today, the Victoria Government Gazette, and the Road Safety Act, and can only find Definition of a Bicyle and 200 watts, not what equals it like they use to have

[Godzilla]

Well thats the thing Jaz, they cannot relate a engine capacity to a total power output.

The problem is engine design efficiency, what one engine may output in power can be totally different to the next design.

Then start adding a bigger carb, more freer flowing exhaust, etc and the power levels start going well over the prescribed limits, hence the 200w, no ifs or buts limit.

Some talk that the limit may be raised from 200 to 250w (like it will make that much difference when there are engines producing close to 3000w available)

I would have thought the sensible solution would have been to limit the top speed of the engine assist, rather than the power output of the engine.

[Gerbertron]

I saw a place in qld on the web that were making micro turbo's for small rc engines, they would probably suit one of these motorised push bikes too, i was thinking of one for my z50

Vicroads really has no clue when it comes to electirc power, I had to register an inflatable boat with an electric trolling motor, basically a toy. It was a nightmare they wanted an engine number which the electirc motors dont have, so i had to fudge one. The number had to be stamped, which you cant do as there is only a small thin alloy tube where it can be placed, so i engraved one. They wanted to know the HP of the motor so i used a Watt to HP calulator and it came out as .3hp or something so they entered it as a 3HP. It was a huge waste of time but i had to go through it to use the boat. I was fined from some jerk on jetski when i was going flat at walking pace about 50m from shore in the bay

I found some old links i had saved on motorised bikes, I thought the derringer looked really good.

The price was too expensive then i found this forum which had alot of similar styles.

But there's some really good projects and lots of info on different motor choices there.