My AF18

[Raindrop]

Sup everyone .. name is raindrop and im trying to build a bad * scoot

heres what i got so far .. 2004 kymco zx which is a dio af18 engine

a 48mm bbk .. 24mm oko carb .. high performance varitior .. and dio v8 exhaust

what im asking you no it all's is what else should i get ? i wanna go like 50-55 cruise

but 0-55 i want fast .. like sprint fast .. please drop some info guys ..

is a 120 jet to big ? i have other jets .. ohh and oil has been blocked off

















thanks ... your scoot lover raindrop

[Downsouthdio]

Does your zx have aftermarket gears? What speeds are you reaching now?

[Raindrop]

no just stock gears .. like 50 mph but not completely broke in yet ..

live in mi so its getting cold to ride .. started build in oct

but its gonna be 47 degrees fri so zoom zoom .. more testing

[Raindrop]

?? anyone else input ?

[Downsouthdio]

I reccomend aftermarket gears.. It will keep your rpms lower so you arent constantly straining the engine, and you will gain more on the top end..

[knucks]

Where in MI?

[tazland001]

Get some gears raindrop. They are one of the most important part of any upgrade.

Taz

[Wheelman-111]

Greetings:

Quoth DownSouthDio:

I reccomend aftermarket gears. It will keep your rpms lower...

This suggests you don't understand the concept of Continuously Variable Transmission, South. Steady-state cruising RPM will NOT be affected by the mechanical gears, but only by alteration at the Belt-Drive.

.. so you arent constantly straining the engine,...

The engine spins up at whatever RPM the belt-drive dictates, until the belt "tops out". By that time, a stock engine pretty much runs out of juice, (I can't believe the potty-mouth police deleted pee oh oh pee!) even with stock gears. High RPM operation doesn't "strain" the engine as much as lugging, when both lubrication and fan-forced air are scarcer. If lubrication and cooling are adequate, a two-stroke engine self-limits RPM as dictated by intake, porting and exhaust. Running wide-open all day is possible, 'til the fuel tank runs out.

...and you will gain more on the top end.

Once again, a kernel of truth but the statement misses the point. If the engine has the ponies to push faster than the stock gearing+belt "overdrive" allow, then yes taller gears will increase speed. If not, Nope, unless you find a nice downhill.

[Downsouthdio]

He has a bbk.. Go ahead and run your zx with the stock gearing..

[kingkamehameha]

Greetings:

Quoth DownSouthDio:

I reccomend aftermarket gears. It will keep your rpms lower...

This suggests you don't understand the concept of Continuously Variable Transmission, South. Steady-state cruising RPM will NOT be affected by the mechanical gears, but only by alteration at the Belt-Drive.

.. so you arent constantly straining the engine,...

The engine spins up at whatever RPM the belt-drive dictates, until the belt "tops out". By that time, a stock engine pretty much runs out of juice, (I can't believe the potty-mouth police deleted pee oh oh pee!) even with stock gears. High RPM operation doesn't "strain" the engine as much as lugging, when both lubrication and fan-forced air are scarcer. If lubrication and cooling are adequate, a two-stroke engine self-limits RPM as dictated by intake, porting and exhaust. Running wide-open all day is possible, 'til the fuel tank runs out.

...and you will gain more on the top end.

Once again, a kernel of truth but the statement misses the point. If the engine has the ponies to push faster than the stock gearing+belt "overdrive" allow, then yes taller gears will increase speed. If not, Nope, unless you find a nice downhill.

I was waiting for that. I kept my mouth shut in lew of the trollers on here. You pretty much nailed it. Im glad to know that there are people out there like yourself wheeldude who know the physics quite well. Gearing is misconcieved wrong by most. A cvt trans is tricky to wrap your mind around at first

[Wheelman-111]

Greetings:

It took me less time than some. I grew up with Primitive Snowmobiles - like 1969-1973 Skiroules - and always marveled at how they seemed to find the right "gear" for every speed, incline and snow condition. Honda-san improved on those however, taking the clutch function away from the variator and isolating it within the driven pulley. You don't ever want to smell a drive belt melting from getting stuck if you can help it...

[Raindrop]

ok so new gears .. what about clutch and springs ?

and i live in good old Roseville mi ..

like i said 48mm bbk and 24mm oko that * gas

[Raindrop]

So what gears do i buy? and do i need to change crank.?

[Wheelman-111]

Greetings:

The stock Honda crank is as durable as any, better than most. Leave it unless you have reason to believe it's worn or damaged.

8.44 gears for the setup you describe will give you the best compromise in acceleration, still able to reach 55+ if tuning is well done.

[Raindrop]

Greetings:

The stock Honda crank is as durable as any, better than most. Leave it unless you have reason to believe it's worn or damaged.

8.44 gears for the setup you describe will give you the best compromise in acceleration, still able to reach 55+ if tuning is well done.

So do i search for 8.44 gears zx50 ? does taz have this for sale ..