Adelaide-How it began with me (mb case study)

[djase10]

SOON i'll get up some pictures of my piston & cylinder removal procedure , AND the resulting INTERNAL damage of what happens when the Bottom ring breaks into 3 pieces at power band......
So much so that the piston locked up..

 

[djase10]

Images of the cylinder and piston removal,
& the damage..

 

[djase10]

more.

 

[Irish John]

What's new?

Djase, my garden is full of such items as shown in your pictures. That is what those engines do after a length of time. The length of time varies from very short to pretty short depending on how much you ride your bike as well as how hard you ride it. After a while it becomes much cheaper to buy a Whizzer or a decent 4-stroke. There was a batch of piston rings recently that all break just like yours. I've had 2 engines break rings shortly after running in and I nurture my motors like a baby. The only people who seem willing to put up with these motors are people who don't ride much or just love taking the motor to bits all the time and rebuilding them. Time to consign yours to a flower bed and buy something better. Stop now before it's too late. If I hadn't bought the 4 stroke my epitaph would have been:
Here lies Irish John
The bicycle stopped
But he went on!

 

[djase10]

Your right irish J,
I installed new piston - rings- & new cylinder, and after 1hr of soft riding
with a 10 min stop at 1/2hr point , ===================

it thru another ring ( this time the top ring)..
I refuse spend another cent on this, thats for sure.
The cylinders are as soft as cheese, perhaps if the cylinder was SLEEVED with a strong material, things may be different..

Its fun at first to pull down the motor to the internals, but that wares thin pretty quickly
when nothing but troubles are encountered.

4 stroke, and a good 1, thats the only way out ..
Peace --and stay safe on the roads ALL..
djase10

 

[djase10]

Lifan70cc/ & 49cc honda clone

lifan 70cc 4speed. ebay @ $199+ $50 P&H=($AU)..
width issues perhaps..
Tempted but..

Also by the same seller are what i believe to be
HONDA 49cc clone, as seen in the last 3 pictures..

 

[graucho]

My son in law had this engine set up on a chinese mini chopper set up. It ran good for him for 2 seasons. But If I remember correctly, I think the total width was 14" I dont know what set up your planning, but I hope this helps.

 

[fatboy67]

What!!!!

You can't be serious!! MAN I'm from Adelaide the cops are not to bad on motorised bikes here, but that looks like it just come off a road bike you'll have to have room for peddles. Before I brought my set up just a 48cc I asked the cops what they thought about motorised bikes and the main thing they look for is if it's peddle assisted, they said if it's got peddles and they look like they are used on the bike, they are not that fussed. That thing you've got there 70cc 4 speed it would have to do 80-100 km. The cops I quized about motorised bikes also said,, as long as you're max speed is around 25-30km ( because of the bicycle helmet) Hahahah I could just Imagine you cruising at 80 plus km. They'll take one look and say WHAT THE &^)^*^%)^ Anyway good luck man I'm Jealous. Me saying all that will probably bring you good luck and you'll ride it for years no probs,, and i'll cruise down the street with my ****y 48cc and they'll pull me over and book the **** out of me.

 

[djase10]

Cheers Graucho, yeah thats about right,

Hi Fatboy67,,
Yeah the width would be the only hassle --the pedals would sort of not be connected to any thing ___, Just be welded in a nice position to access the gear leaver , as to still look like they are STOCK.....

But yeah over Kill with the gears, i would prefer a semi-Auto 70cc, so thats what im on the look out for....

As for the speed-- thats a bonus.......

Yeah Nice Adelaide Police ,,hears a good one,
Last year I interrupted a couple of wannna be thieves trying to BOLT CUTTER access my lockup (@ 3am)to steel the Motored Bike,-
-- Well-they were frightened away quicksmart upon my arrival,,,
I call the police ,
He rocks up,
I'm getting ready/ and a tad worried for the MAYbeeZZ /problem about the 200w legal limit ,
TO My surprise He loves the bike, and only ONE question....
He takes me to his car and he spins around a LCD screen thats on the NET,
and he asks me where to get this kit from,
and in a blink ..hes on the zbox web page....
and says hes going to get a kit for his son.....
Blew me away about the broadband cop cars,,, Excellent....
Top cop.
Stupid thieves
True story...

 

[djase10]

Anywayz , back to the bike..

I resurrected my old 49cc, and installed it in the ToPGuN FLIGHT..

I had to fix an broken stud
ezyout
then
filled hole with
Selleys Knead-It (Auto)

then tapped 6mm thread..

Mounted....

Its good that the 49cc and 66cc share the same mounting dimentions,,
makes the transplant easy as..

Here are some pictures...