Building a fast and reliable 70cc setup (HELP)

Hiya Guys ,
I'm kinder new on these forums and just turning 16 I am already on the level to get a good
fast setup that will amaze mates with the top speed etc etc etc....

I have a : NRG Mc3 Liquid cooled 50cc bike ( DD)
Already have Haynes manual for it as my bike is also in the book that my brother bought for his
Typhoon 125..

To the point , I need to know if this set up is any good and how you know which rollers are the best for your bike without Dyno testing etc.

I have been looking up at this setup :

Stage 6 Street race 70cc Kit - £99.95

Polini Variator Kit, High Speed - £40.18 (Rollers it comes with , confused on what to use.)

Dellorto Stage 6 Jets Box 5mm - £13.65 (5mm is the Main jet size for Mc2 but not sure Mc3 + can someone tell me the levels that is suitable ?)

Malossi Primary Gear up kit 15/38 - £56.24 (Not sure if teeth size is right)

Malossi Kevlar Drive belt - £30.47

Polini Rollers box set - £11.90 ( For testing if needed )

I already have a ( Leo Vince, ZX exhaust which I'm told should work fine with 70cc )
Need information about if this is a good setup to have and if anyone knows what jets and
rollers my bike needs would be ideal for what I am set to buy.
I'm also aware of needing to get a variator locking tool but if any other special tools are needed please say.
Last thing is , would this run ok and would I need anything else or can I leave stock ?

Thanks to all ,

 

Wouldnt worry about the up gear kit... rollers I would say would be around 4-4.5g but you would have to do a road test for sure... other than that the set up would go well.

 

Ok Thanks , but why don't need to up gear.
Surely the standard gears wont be able to keep up ?

 

they will , you only need gear up on more powerful kits mate

 

Ok , cheers ..
atleast I get a reasonable kit for good price.

 

Basically the streetrace has a very broad powerband keeping full power 1500 revs higher than the other 70 kits.
The other kits hit peak power at around 55mph and then start losing it the streetrace keeps maximum power longer, so unless you travel long distances at high speed you won't need a gear up kit.

 

Thanks for the post but what kind of long distances ?

 

If you do mainly town work then it's not worth considering, but if you just commute on A roads then it's worth considering. Try it without one first then make your mind up.

 

if you have a gear up kit your suppose to drop the rollers lighter

 

Not sure what carb is in your ped but a 17.5mm or 19mm carb would be a good addition as well

 

i have 3gs in my rox with a gear up

 

Ok well , there is very long roads where I live and I'd be driving from town to town .
If the stock gears some how gave way would anything else result in damage ?
Also do you know what Jet to use if the stock main jet is 75 , because I know they can go very high in sizes ?

 

it wont damage it just means to cruise at 50mph you will have to be doing about 1000rpm put a gear up in and you can cruise at 50mph and do like 8000rpm so its less stress on the engine

 

Oh ok , so would you recommend gear up or not ?
If its a very small change and not needed I'll probably just keep my money for something else.

 

No sorry , I checked again in Haynes and it says :
NRG MC2 with dellorto carb ( NRG MC3 Specs not available )
Starter jet - 60
Pilot jet -38
and Main jet is (66)
So that should be it .. if im not reading properly .
Please tell me .

 

As a rule of thumb if you're keeping your standard carb you will need to upjet about about 10% when you derestrict and add a sports pipe, a 70 kit would need about another 2 sizes. For example an aerox standard 12mm carb jet is 62 add 10% = 68 for derestrict and +2 = 70 for the 70 kit.
So if your standard jet is 66 add 10% = 72 +2 +74. So 75 would be a good starting point.

 

Oh ok , yea thanks for explaining Mr Bizzle , lot easier to understand ..
but would it depend on the air filter im getting to keep the amount of air and fuel even ??
Also I haven't actually gone to touch my ped yet but to understand everything first.
When bought which weren't long ago .. It already has a ZX Leo vince pipe .. and other then that
I don't know whats derestricted or what can be derestricted , Haven't yet looked into it ..
But is it only the rescriction in the pipe which makes an up jet by 2+ ?? or the fact that I put the 70cc kit on as well as an air filter.
Sorry for questions but rather be safe then sorry.