Tuning an air cooled speedfight

just thort id get some info to help a mate out who just brought a speedfight 2 air cooled and is looking for more speed.
basically there are two main things im unsure about:
1) does anyone know what rollers come with the gianelli extra exhaust as iv given him sum 4.9s to try and ther still not right
2) how does it being an air cooled engine affect its tuning potential, for example can he run a polini sport without it blowin up? what is needed to provide the extra cooling if needed?

 

you shouldnt need any extra cooling, mines air cooled and i got a polini bore and it fine

 

Ok mate 1st of the rollers he needs are 6.7G they are like 3.25 on half price on Adrinelin.

He will need to upjet and if it has the gurtner carb it has a 50 MJ so work out 5% and upjet.

Get a 70 kit like a polini corsa they are like £80 on scooter attack and he will definitly need a bigger carb with that like a 19mm or if he dont have the funds he must upjet again to suit the kit.

 

i think about 6g's should be fine maybe more

 

Surely you would want to go lighter???

 

peugeot engines can be proper cunts to setup sometimes, make sure the incorrect roller issue isnt actually a jetting issue, for example, if the bike is on the stand and you give it full beans, does it lag? or bog down at all, does it sound flat and not perky, its a speedfight so its not gonna blow you away with sheer power, but it should sound like it has at least 1bhp. if it doesnt, check the jetting, and enjoy fucking your hands up whipping the plug out every time, stupid vertical cylinders..

 

lol mehmet has 5.something in and its screaming it tits off try 6.7gs or sumin

 

You cannot get 6.9's for them they have 5.1 6.0 6.7 and 7.0

The 6.7 ones are the leo vince ones that are made for there exhausts

They are perfect working i mixed original 8.0g and 5.1's 3 of each it avrages out 6.5 which is runing alirgt but i guess when i recieve the 6.7's it will run a little better.

I totaly agree with swift it was a cunt to take out the fucking carb just to rejet yesterday

 

yeah i found the speedfight uses heavier rollers than piggys etc...

mine was an L.C model,

think it was about 9 ish grams std and 7 to 7.5 grams for sport 70 set up....which is really heavy in a piggy engine

:nerd:

 

What was your setup dave im thinking of getting it a little more power out if it as i am getting bored of 45mph on the straight and the acceleration

cheers mate

 

take your end can off and get rid of as much clogged up oil as possible

this is a real problem with speedfights. when i did mine i gained 10mph on the clocks for 5 minutes work

 

Cheers for that monty ill give it a go once it stops raining lool

 

My set up was:

Airsal 70cc kit..Kundo rapid pipe..over sized reed block..malossi variator..polini belt..stiffer clutch springs and lighter rollers.

Things to look out for on the pug engine is:

std type inlet manifold and reed assembly is very restrictive..

Rollers 16x13 are very small (wear out quickly)

 

yep very true...

but if your after an aftermarket variator theres a couple on the market that use the bigger 19x15.5 rollers

 

Soo was it worth the time and money spent on it or should i just wait till june and get a 125 ?? :unsure:

 

The port aswell, i pissed myself when i compared my X8R (same engine i think) inlet port to my NRG one :rofl:

 

yeah the inlet port is kinda small as well

the whole inlet tract from the carb to the inlet port needs changing

but all the gears available...bigger carbs...bigger manifolds...better designed reed blocks...that just leaves an hours work with the dremel opening the port out and bobs your uncle

or better still...buy a stage6 engine mount kit and bung a piggy in

 

if it was me...i would go for the 125