Sito plus exhaust on PX

[bignico2411]

I want to fit a Sito plus to my '84 PX 125. I know guys who've done this and not replaced the main jet without any problems, but I'm erring on the side of caution. The manual states my main jet is a 99, how bigger do I need to go? Apologies if this is a particularly daft question, but I'm a Luddite at all but the very basics!

Thanks

Nick

[henri]

get sum earplugs aswell ,sito's are loud , an i'd reckon a 102 main jet should be ok, but i'd start with a 104 n go from there , H

[bignico2411]

Thanks H, I'll get both and see how we go. And some earplugs!! 

[vespasco]

You could try drilling out the air filter too.
Up the main again to a 104+
Theres a sticky on this

[bignico2411]

Thanks Vespasco, I'll do the exhaust first and then maybe have a go at the air filter. Something else I should have asked, do I need to change the plug and, if so, to what?

[vespaskin86]

i wouldnt think changing the plug would be needed

[bryno]

as said, plug will be fine as is, if you are getting the 104 jet you may as well drill the airfilter same time, check yours as it may already be drilled, some PX airfilters are pre drilled, so if its been replaced at some point...