49cc for daily Commute.

[09zufar]

Hello everyone.

I currently have a New Way Grido chinese scooter and i was wondering if it's possible to make it more powerful for long distance rides by keeping it a 49cc.

I've been riding for 4 months now and there are situations where i feel unsafe due to the lack of climbing power.

DETAILED SPECS :

Make & Model : New Way Grido
Engine : LJ1PE40QMB 2T 49cc
Top Speed (GPS VERIFIED) : 72 KM/H
Uphill Speed : 40-45 KM/H

My goal is to cruise at around 80 KM/H without any difficulties with a good amount of torque to keep it constant and a little more power in reserve if i want to overtake.

I was going to buy a 19mm super flow carburetor tommorow then i thought i should ask you guys first.

How important is a hi-speed variator in achieving the mentioned speed ?. Is my stock variator not enough if given the right amount of power from the engine?.

[TheScooterJesus]

I would upgrade your CVT first before anything, and if you still need more I would do an exhaust and upjet the stock carb.

[09zufar]

Okay.

I will buy the Malossi Multivar as it is the only model they have here.

and for the upjet, i need to increase only the main jet size?

I'll do these 2 things and maybe post a top speed/acceleration video.

[aeroxbud]

The biggest gain for least amount of money is a big bore kit. You could still use your stock exhaust and carb if you wanted. Just change the jetting.
I'm guessing at 72kmh if that's on a level road. Your exhaust is not restricted.
I variator will help with keeping the revs more constant. And hill climbing. But won't add much to the top speed.
An exhaust is the easy option for more power. A good exhaust will give a big increase in top end power.

[pili]

I agree with Aeroxbud bang for buck a bbk is your best bet. Jets are cheap and if the needle on the carb is adjustable it’s a little more fuel at partial throttle. It’ll give you a little more top speed and get up to speed much faster which in my opinion is more important for commuting. If you need a few more MPH, a good exhaust like a Malossi Wild Lion will get you in the 80 kph range depending on what the final drive ratio on your scoot is.

[09zufar]

Thanks everyone.
Where i live in Mauritius, 50cc's don't come with restrictions.

I will get a 70cc kit, new variator and if possible a new carb or upjet my stock one.

I will post the acceleration video after im done with it.

[09zufar]

Quick Update.

I ordered bigger main jets, high speed variator, and cold air intake.

Already received the jets. Waiting for the other parts.

I wanted to keep it a 50cc. Will update once i install these and do a top speed test.

If it still won't go 80km/h easily then ill go for the 70cc bbk.

[09zufar]

Update.

I installed Koso performance variator, Cold Air Intake, and increase main jet from 68 to 75.

Acceleration was much better but once the main jet kicked in the engine sounded rich and was hesitant.

I installed 70 Main jet. Acceleration once again improved with no hesitation.

I gained no top speed. I still top out at 70-72 km/h but it gets there quicker.

Will a 17.5 carb increase top speed in my case? . Stock carb is 12mm.

Will a 70cc kit go faster @8000 rpm compared to a stock 50cc @8000 rpm??

[aeroxbud]

A carb on its own won't make any real difference. The bigger carb is to feed the extra demand from more performance parts.
Is the CDI restricted to 8000RPM?
The variator is maxed out at 8000RPM. So it won't go any faster unless you change gears.
If you don't want to increase the capacity a good expansion chamber exhaust should get you a few MPH more. As it moves the peak power higher up the rev range.

[09zufar]

Jun 1, 2024 14:50:03 GMT -5 aeroxbud said:

A carb on its own won't make any real difference. The bigger carb is to feed the extra demand from more performance parts.
Is the CDI restricted to 8000RPM?
The variator is maxed out at 8000RPM. So it won't go any faster unless you change gears.
If you don't want to increase the capacity a good expansion chamber exhaust should get you a few MPH more. As it moves the peak power higher up the rev range.

My scoot reaches over 9000 rpm at top speed slight downhill. Max rpm registered on my tach is 9250rpm. Fully de restricted from dealership to match our 40 mph urban road limits.

I said 8000 rpm as an example. If a 70cc kit makes 6hp at 8000rpm and 50cc makes 4.2hp at 8000rpm. Which one will go faster at that specific rpm? If two would race side by side?

If it will be faster i'll invest a last time on a good cylinder kit.

Thanks for helping me out. Once the variator belt has travelled the highest it can go, what is required for going faster after this? Higher Rpms or higher horsepower?

[aeroxbud]

They will both go the same speed at the same RPM unless you change roller weights. The more powerful cylinder will just get there more quickly.
A more powerful cylinder will allow you to push through the air resistance at higher speed. Where with a standard cylinder at higher RPM it is making less power.
If you read through this blog on Pedparts it will give you more understanding of how pipes and cylinders change performance. www.pedparts.co.uk/blog/sports-exhaust-testing-50cc-and-70cc-sports-mopeds-part-one

[09zufar]

Jun 2, 2024 4:54:09 GMT -5 aeroxbud said:

They will both go the same speed at the same RPM unless you change roller weights. The more powerful cylinder will just get there more quickly.
A more powerful cylinder will allow you to push through the air resistance at higher speed. Where with a standard cylinder at higher RPM it is making less power.
If you read through this blog on Pedparts it will give you more understanding of how pipes and cylinders change performance. www.pedparts.co.uk/blog/sports-exhaust-testing-50cc-and-70cc-sports-mopeds-part-one

Thanks dear, I enjoyed reading that. How much RPMs can i squeeze out my stock 50cc?. Will a 17mm super flow carb and performance pipe help achieve higher revs at the top end ?. I only need that +10 km/h speed.

[aeroxbud]

If you only have the stock exhaust, something like a Yasuni R will give you that extra speed. And without the complexity of fitting and tuning a carb.
The Yasuni R will move maximum power up to the 9-9,500rpm range. You would need rollers, a jet kit and clutch springs.
All stuff easily done with a basic tool kit.

[Zino]

To get more power a yasuni r or yasuni z would add a lot

Stick with the stock carbs since you are not changing the displacement and just get some jets from 5-10% bigger than you have with now to feed the pipe better
a bigger carbs than you need actually would make it sluggish

You will need lighter weights than you have now in the variator usually you need to drop a gram or 2 per weight because power will start later and peak higher .

You also will need hard clutch spring to get up in the power band so you start with power .

Go slow change one thing at a time so if it runs worse you can retrace your steps

If your cdi is hitting 9k rpms down hill you do not have a restricted cdi

[09zufar]

One last thing i wanted to ask.

Can i take a 90cc 1pe50qmf cylinder, head and piston and install it by replacing my 1pe40qmb 50cc? Do i need to modify anything kike the crankshaft?

Have anyone ever done this on these engines?