What conversions or mods would be needed to make a Roketa 74 (150cc) scooter go 55mph?

by Anonymous
(Somewhere)

I haven't bought the scooter yet. I want to fully understand what will be necessary to make it go 55mph. (It's gonna have to for my needs/roads). If it's too complicated for me to make these changes, then I might choose a different scooter. Comments? Suggestions?

Comments for What conversions or mods would be needed to make a Roketa 74 (150cc) scooter go 55mph?

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Sep 21, 2011
 55 is more than possible AND SAFE!
by: Alan85

Ok, don't listen to those other comments I install racing mods on 150cc bike all the time, and they are capable of doing 70mph with the right parts. start by installing a large 115mm variator with a heavy roller 12 to 14grams. then remove the air box and secondary air intake (if applicable) and replace it with an uni filter pod and re-jet your carb if needed. then install a high flow MRP pipe. your bike should do 65mph or better and 50mph up a hill.

As for it being "unsafe", riding any two wheel vehicle is about as safe as riding a mechanical bull in the middle of busy intersection.
Jul 17, 2011
 Ride it like its stolen!
by: GrowAPair

My 150 will go 55 all day on level ground. Hills are a different story. Make sure it is running properly. Cars, traffic and wind don't bother me or anyone who knows how to ride.

The idea that bigger and heavier bikes are needed to ride in the real world is perpetuated by those who can't ride. In the 60s and early 70s the roads were filled with "little" Honda 50s and such. I remember a guy that rode to work every day on a Rupp Roadster 5hp minibike.

My Roketa took some tweaking to run properly. Removing the EGR was a big plus, not that EGR is bad but it created a vacuum pulse that disrupted the CV carb slide. Your scooter should accelerate smoothly to full speed and remain these without any missing.

Check the scooter forums for good info. Ride it like it's stolen!
Jul 04, 2011
 55 on a 150 Is Too Fast
by: Anonymous

To go 55 on 150 is possible but uncomfortable and unsafe. You'll be really pushing it. Try variator mods, fairly easy, more air in tires, do tires, at your own risk, larger piston cylinder head carburetor main jet, and muffler. About 500 bucks plus a lot of work.

I wouldn't take a 150 on the highway... trucks and crosswinds will terrify you for good reason. It's dangerous. You need a heavier bike to handle the air currents. If you only need 55 occasionally you can research nox injectors. Do your home work.
Apr 04, 2011
 Get a bigger scooter
by: Bill

If you expect to travel at 55 mph regularly then get a 250cc scooter (minimum) or larger. Most 150s will strain to keep 55 mph on a flat road; uphill will slow it down into the 35-50 mph range depending on the slope.

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