2013 YY250T performance By rsw1158 (Read 1,163 times)

[rsw1158]

Just received my 2013 Roketa YY250T scooter last Thursday. I'm in the breaking in period at the time and I am very curious about something. Some brands of the same body 250 scooters can do 80mph or so and others around 70mph. What is making the 80mph scooters go that fast? Is it the final drive gears? I checked for restrictions on my scoot and didn't really find any except for the tiny 108 main jet that I drilled out to about 120. After driving it 300 miles, I can tell that it can go a little bigger yet. Still a little lean. I would like to get some tech. input on this subject because most of my driving is highway driving.

[bhinch]

Welcome...Have you changed out the fliuds or did a dealer do a PDI. The fluids need to be changed to american made stuff, coolant, brake fluid, oil, drive train fluid 85w90 gear lube. Let us know we can help with the partculars. I see you have made 12 posts or did I miss the beginning of the thread. Enjoy your ride....

[Alleyoop]

Well some come with the HELIX 244cc motor and some come with the LINHAI 257cc motor.
Which motor is in yours. Also do not believe what everyone says on how fast they go. The speedos are off and not accurate, but they should do 70+ and also depends on your weight and headwinds.
Alleyoop

[jenningsjosh]

Alley? What does takin off your speedos have to do with anything? Lmao lol lol

[rsw1158]

I've been a scooter owner for over 5 years. I started out with a 50cc, then a 150cc Bali that I still have, and now my 250. I know a few things about them and did some mods on my 150 to achieve 65mph. So, I do know my way around these creatures but not so much with the water cooled 250s. Yes I did change my fluids and I had this thing torn down to frame and engine to completely check it out. This is the 244cc engine. This is a real pain to try and do a fuel air mix adjustment. This scooter feels like it has enough power to handle higher road gears for more top end. Just wondering if anyone has tried that on these scoots and what the results where.

[Alleyoop]

Well to get that puppy to hit high 70s or so I think the only thing you can do is put in taller gears. But you would first have to pull the tranny plate off and see what the current gearing is and the size of the shafts and how many splines to try and find gearing for it. They already come with about 123mm Variator and a big Clutch pulley, you could work with the Variator weights but that will only get you a couple mph more nothing dramatic.

I would first mark the Variator and see how high the belt is climbing so you then will know whether different weights will get you some more top end speed or if you need more RPMS.
Alleyoop

[rsw1158]

I did check the variator when I had it tore down. The belt is riding about an 1/8" or less from the outside. That is at max from my experience. But it achieves that at rather low rpms, around 6k or a little less. So, the scoot is performing very well before getting to it's power band. I kinda like that. My 150 has to run at full throttle and 7.2k to do 60-65mph. I did get more mid range power just by drilling my jet out on my 250. Still getting 70mpg. I am happy with the top end but if I can get more, I'll take it.

[Alleyoop]

Since your current setup the belt is climbing as you say 1/8 from the edge that is all she wrote on the belt so now for more top end speed you need more RPMS or taller gears no two ways about it.
Little more rpms can be had by going to 1/2-1 gram lighter weights. Rollers for every gram up or down will change your rpms by 500-600. Sliders by 200-350.
Alleyoop

[rsw1158]

I was checking out the variator and to me it is a strange beast. As a matter of fact, I couldn't pull it off the shaft. I couldn't figure it out. So I did a little searching and it is the same thing Honda uses. But, I couldn't find anywhere to tell me how to pull it off. Help?

[Alleyoop]

take a picture of it, since you say its the same as HONDA uses WHICH Honda the reflex? I mean it should have a NUT on the outside to be able to take it off the crank.
Alleyoop

[Alleyoop]

Here is a HONDA 250, no difference on the VARIATOR than any other scoot except the CLUTCH the CONTRA SPRING is on the outside:
Alleyoop

[rsw1158]

This variator is like a sealed unit. It has the nut and the outside slide plate that comes off which I did but the other part with the rollers in it is like a sealed unit. When I tried to pull it off the shaft it will only go so far and stop solid. I'll try and find a pic of it.

[Alleyoop]

I think it may be just sticking on the crank or the Backplate is stuck on the back sometimes they do that due to the heat the back plate sort of gets welded to the crank.
Alleyoop

[rsw1158]

Here is a pic of what I have.

Attachments:

[Alleyoop]

Yep that is a regular 250 variator, just take those 3 screws off to take the cover off and you will see the ROLLER weights in the ramps. The reason they have a cover on those is because they put grease in the Variator ramps and the cover is needed so the grease does not come out and get grease all over the belt and inside the CVT.
Alleyoop


Here you go shows you how-to: