ethos half system jetting???

[ChowderV4]

will you need to rejet for a half system and if so does anyone know what jets i need

[viper_biker]

118/120 is a good base setting.

[micpec]

yes, in most cases with fitting an aftermarket exhaust half system you will need to rejet the carbs.
Sizes depends on what mods are done to the engine.

[ChowderV4]

none, engine is standard .

[micpec]

In that case I agree with Viper_biker, go from a solid base (118/120 is good).

[viper_biker]

And 2.5 turns out on the a/f screw and you should be in a good 'ball park' area for the bike. Any biggeron the jets and you'll find yourself being a bit rich. I ran 120/122 on my bike with an Ethos half and that was too much even with 2 sheets of HRC filter foam which would be petting more air in.

[emto]

I ran a half Ethos system (since changed end can to Tyga) with 118/120 jetting with needles raised and it was far too rich. I had the type of can with the three internal sections and small outlet bore which causes major restriction and gives a whiney type sound.
I kept the ethos pipework and put a Tyga open can on to help lean it but ended up reducing the jets to 115/118 and no needle shims.