Im looking to replace the standard 125cc barrel on my PK 125 (VMX5T, Dellorto SHBC 1919E).
Can anyone give me advice on how to jet the 19.19 and what sparkplugs to use on the Polini mono ?
Same question for OLYMPIA/ DR 130cc.
You shouldn't need to change the main jet, if anything you may need to drill out the jet 0.1mm and see how it runs, remember you can onlt tune when engine is running temp.
Just the standard plug or go one hotter than standard.
Go DR if you're on a budget, Polini if you can afford as better performance