Yamaha Aerox bidalot to 100cc 2fast

[90GTVert]

Dec 14, 2020 12:07:07 GMT -5 pewpew said:

What do you mean by over-revving?

RPM beyond where you make the best power. For example, I don't really want to be over 14,000RPM for best power, but sometimes it has to get there for top speed. If your CVT is controlling RPM and it's not ramping up RPM quickly near top speed, then the gearing is "long" enough.

Dec 14, 2020 15:54:45 GMT -5 808ministroke said:

I find it kind of strange how everyone on this forum seems to agree that around 10:1 is ideal for even high power setups. i find this strange because i see alot of set ups on honda elites and sym dd50s that run gearing as high as 7:1 with a ported polini corsa. i know that wheel sixe matters and elites are always 10inch but is there another difference possibly, is the pulley system on a af16 vs a minarelli or piaggio hold shorter ratios perhaps?

I am going up a massive amount on my ratio from 12:1 to 8.5:1 i understand that will require a overhaul on my cvt and i will still lose take off speed but i ran 9:1 gearing on a build with the standard stroke and it pulled fine.

pewpew is your build on 12" wheels and is that why your ideal ratio is around 10:1 instead of 8:1 ?

Calculated example with different tire sizes, all with 10:1 final drive ratio @ 10,000RPM...

100/90-10 : 51.1MPH
130/70-12 : 57.3MPH
140/60-13 : 58.7MPH

The 100/90-10 would need to change from 10:1 to about 8.7:1 to achieve the same speed at the same RPM.

This is all calculated. Real world, the CVT matters quite a bit.

[808ministroke]

Dec 14, 2020 17:58:19 GMT -5 pewpew said:

Dec 14, 2020 17:43:25 GMT -5 captincvmn said:

13’s?
I’m a scoot noob but I’ve not seen 13’s. 10’s and 12’s I thought ruled the roost.

dang 3 1/2 hp stock is sweet for unmodified.

[Lucass2T]

Dec 14, 2020 17:43:25 GMT -5 captincvmn said:

13’s?
I’m a scoot noob but I’ve not seen 13’s. 10’s and 12’s I thought ruled the roost.

13's is quite common in Europe actually. All the top sales (90-00's) 50cc scoots in Europe had 13's.
Aprilia SR, Gilera Runner, Yamaha Aerox, Peugeot speedfight the list goes on.   

[pewpew]

Which variator kit is better? Polini is cheaper.
www.scootertuning.ca/en/variators-oversize-cvt/100127-transmission-kit-polini-evolution-3-ceramic.html
www.maxiscoot.com/en/product/malossi-overrange-variator-kit-la-furia-rossa-yamaha-aerox-bw-s-48038

[pewpew]

Haven't made much progress yet on the build because im waiting on some parts to arrive. Gotta ask before ordering, shielded or sealed bearings on the aerox front wheel? It currently has the metal shielded bearings but maxiscoot only offers rubber sealed bearings for the front wheel.

[Lucass2T]

You need the closed ones with the rubber caps. Leave the outside ones in place but remove with both bearings the caps on the inner side and pack that area liberally with grease.

[pewpew]

Did some work on the cases, alot more has to be done. Hoping to start building the engine next month

[Lucass2T]

Looks great!

[pewpew]

Finished porting the cases and made room for the variator. Also got the cases bolted together

[pewpew]

Got the engine together, still need to figure out how to remove the gearbox bearings so i can mount new ones and finish the engine build. Set the base timing at 0,35mm btdc

[aeroxbud]

Coming along nicely.
If you haven't got a blind bearing puller, you can use the bread,grease,paper towel trick.

[pewpew]

Got the rest of the engine together today. Took the cases to a small machine repair shop and they took out the gearbox bearings for 5€. Took only a few minutes with the bearing puller

[aeroxbud]

Well worth the €5 then. 👍

[pewpew]

I was wondering, if i use a subframe that lenghtens the engine by 10cm, do i need to rise the rear by 10cm so its stock height? I bought a easyboost subframe because the stage6 one comes to stock in july. I need a longer rear shock and 1 riser either 40 or 60mm, and i need the shock to be about 320-330mm because with a 280mm shock and 40mm riser it was on a good level. Will a 330mm shock be long enough to keep the scooter at a good level with a riser? Edit: So im going to switch to the stage6 subframe in july and remove the riser

[808ministroke]

are you reffering to the easy boost sub frame for rear faced carb? im asking because i was gunna get one for myself but i was wondering if you had to bore out another mounting hole on the frame itself because thats what it shows . did you have to do this and did you drill a hole on the ear of the engine swing arm ?