Speedfight 2 carb jet size

I am rebuilding a speedfight 2 with new crank etc and wanted to know what size jet goes in the carb.
The bike has a standard 50cc barrel and piston but it has a aftermarket gianneli exhaust.
Standard Air filter etc and 6g rollers.
Just needed to get the correct size jet before i re fit the carb.
Also the petal on the reed is sticking up a bit does this mean the petal is no good ?

 

with my leo-vince exhaust i had to add 15% on to the original jet size i would think this would be roughly the same for you but im not positive

 

Thanks for that but I have no jet in at present so needed a actual size to order.

 

oh not to sure then i know my 08 liquid cooled 50cc speedfight 2 has a standard jet size is 50 but this may be diffrent on diffrent years and wheather is ac or lc

 

just get a pack of 10 on ebay for £12 then go from there

 

I have found out that the standard jet size in my gurtner carb should be 52. Some sites say just go up one or 2 sizes if you have a gianneli exhaust and some say different. Don't reallt want to get a pack and keep changing it as just thought somebody may know what size to go for exactly. It has a polini variator and sports exhaust thats all.
I thought of trying a 60 jet size ?

 

I thought of adding 15% to the jet size as you said until the previous reply said an 83 which I would have thought was very large for a standard 50cc with just a racing exhaust ?

 

well when i bought my leovince zxr donotlink ped stop said to add 15% to the original jet size so if your original is 52 you need a around 60

 

Thanks for that and will order a 60

 

i would just order a few like a 60 and a 58 incase the 60 floods it but i dought it would

 

Hi and yes it is a gurtne carb just the standard one from new.

 

hi 58 would be the best size or you will have too much fuel and the barrel will flood

 

I've got a speedfight 2 and wanna change the air filter but they say add 15% to your jets, how do I do that ?

 

Hi guys i have a 02 speedfight 2 50cc it has a leo vince exhaust it runs and rides fine but have noticed after riding for a while at full trottle it will bog then cuts out but if i turn it of by ignition and back on again it will start back up and it ok for a lil while again the main jet is a 72 i belive any help ?

 

You need a 76 to 80 jet, you are running lean and are risking a heat seizure.