peugeot 50cc speedfight or vivacity

when i open it up it dies in power and i let off to get the power to build up again

at the bottom of this thread there a post by the member whooot that has a similar set up and says 79 jet

http://www.scootertuning.de/faq-bes...r/373368-faq-diverse-set-up-s-abstimmung.html

 

have you tryed it with the 100 jet in that you started with

 

only with the 8.5g rollers

 

then try it with the lighter rollers. the 8.5g are 100% too big so don't use them again
you problem now will be jetting, your rollers may need fine tuning but get the jetting right first

 

i have the 6.5g in now reckon to try 100 jet?

 

yes, if you problem is a total loss in power then a bigger jet will be need

 

ok will try that 2moz

i should be getting atlead 40 mph though?

 

yer 40mph is not an unreal speed to expect

just remember if it runs on the 100 jet it may still not be spot on so dont spend all day hammering the bike

 

yea i will be getting a new spark plug aswell as it was black

 

i have just seen that a piaggio 50cc with the 17.5 when derestricted will be using a 65 jet, so i think your jet as to be too big. even with a free flow filter it would not go 65 to 100. and now you say the plug is black with normally means its rich.

i think your best bet will to be buy a jet pack around size 75-95 start big and work down
http://www.pedparts.co.uk/product/1085/motoforce-racing-dellorto-6mm-jets-box-jetbox

or save a few ££'s as you already have some just and just buy in a few steps you have 80, 100? buy a 70 and 90

 

i found a 56 jet in my wallet lol

my other option is i have a 14mm dellorto carb in my garage might be better to use as standard is 12mm with 72 jet

 

if you go to the stock carb you would have to add jets for the exhaust and air filter so ever way you neeed to rejet, and the 17.5 will give you more power

 

the original vivacity carb setting is this

Carb Type Gurtner PA370
Pilot screw initial setting 1? turns out from fully screwed in
Float height not adjustable
Idle speed 1500 rpm
starter jet 45
Pilot jet 42
Main jet 72
Needle clip position L3035H at top notch

had an issue with the 17.5mm snapped the the brass tube thats sticks down in the float chamber