Carb jets with this set up help.

Yamaha jog rr 50 with a stage 6 sport pro 70cc kit with a 17.5 mm carb with the stock air box and a hpc stage 6 crank. C4 stage 6 crank bearings.Yasuni C16 exhaust, what carb jet do you think I would need?

 

Do you know what jet you have as standard?
Are you running all this setting at the present?
If so what is your spark plug coloration?

 

60 jet is what it was before I changed to the above setup

 

60 does sound pretty small yes
But since you run the standard air box it might be fine
Have you ran it with this jet if so what is your spark plug colour

 

After I put all theses parts on I have not changed the jet or started it because I want to know what jet to start from. The jet was 60 in the first place when the bike was completely standard

 

I would say fit an 80 and work it from their
But won't be able to tell you exactly which one
As every engine is different even with the same parts
And you could live in high altitude where the air is fairly cold
And the same engine at sea level and hotter weather will need different jet

 

Work up or down from 80

 

It depend how your bike run and mainly your spark plug colour
You want ideally brown in the middle of the electrode
if it black it s too rich so need to go down
If it turning toward the White it s too lean and you need to go up
Make you sure you run the bike for a few hundred meter and try to not live it running on idle as this could trick you (idle could be rich but main could be lean)
A good tell tell is to switch the choke on or off when you ride the bike if you can (not electric or awkward to access)
If the bike feel to go quicker when the choke is on you need to go up
If it start to kind of blow raspberry you are close check the plug
Buying a new plug would be nice or at least give it a good clean

 

Okay. Thank you!