Chicago Company Go 50cc

[coachhejl]

Is this a gy6 engine? To where I could use big bore kit made for gy6 139qmb?

And all other parts?

[GrumpyUnk]

I do not know individual brands, and the brands are likely product of a few main corporations. That said, differentiation between them is difficult. To determine the engine design, look at the serial number plate where information is inscribed into the metal of the engine block. The model is usually stamped/lasered into the surface. You can also look at the emissions label and the label indicating factory and other tune up information.
Most will indicate the engine model number somewhere, along with the displacement, date of manufacture, weight, tire size(s), tire pressure(s), oil capacity and viscosity, idle speed, and valve clearance.
tom

[claydoh]

www.genuinescooters.com/product/go-50/
Look at the engine highlight section.

But just by appearance, it is the usual qmb139 49cc scooter, platform-wise. It is sort of hard to find one that isn't, at any affordable price.

Here are a few identical ones
amigomotorsports.com/index.php/product/beemer-50-scooter/
wolfbrandscooters.com/scooters/wolf-rx-50/
There are more, from more obscure names.

[dexameth]

I'm a Genuine dealer. Yes, that model is your typical 139QMB engine. The scooters come restricted from the factory, if you didn't know.
They have the CDI restriction linked to the clutch bell limiting output speed. Simply unplug the bullet connector at the CDI.
The carbs are lean, install a #82 main jet and they have MUCH more "punch".

Amazon cheapo big bore kits will leave you with more of a headache than spending a bit more on quality kits, like Naraku or SSP-G or Airsal etc.

[coachhejl]

What do you mean restricted at the clutch bell?

Feb 4, 2023 7:26:55 GMT -5 dexameth said:

I'm a Genuine dealer. Yes, that model is your typical 139QMB engine. The scooters come restricted from the factory, if you didn't know.
They have the CDI restriction linked to the clutch bell limiting output speed. Simply unplug the bullet connector at the CDI.
The carbs are lean, install a #82 main jet and they have MUCH more "punch".

Amazon cheapo big bore kits will leave you with more of a headache than spending a bit more on quality kits, like Naraku or SSP-G or Airsal etc.

[GrumpyUnk]

I have seen some with a rpm sensor mounted near the clutch bell. It senses the rpm of the input shaft to the final drive gearbox. If the rpm sensed is above what the speed limitation allows, the signal to the CDI will make the CDI quit with the sparking already. IOW, it is a rev limiter. Unpluggind allows the CDI to continue to functino above the factory installed rev limit of the output gearing.
Some variators use a cylinder on the crankshaft that keeps the two sides of the variator from coming together beyond a certain position. Limiting the travel essentially limits the gear ratio produced going higher than the maker wants it to, and thus limits final drive ratio.
tom

[FrankenMech]

Most state laws limit 50cc scooters to a 30MPH top speed unless going downhill or with the wind at your back. Some EFI systems without a carb limit speed and will not function without the speed sensor.