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and as u all can see I've changed the spark plug cap for an mad that hat no resistance. vs ngk original which has 5k.. is there any better coils out there from another Yamaha or something else that is bolt on? what is best? always thought less resistance better spark but from what I've read...

It's definitely soch.. and yes definetly no h-pipe.. what about my exhaust is that come exhaust from auto a perfomance upgrade of some sort or just plain simple an aftermarket replacement?

but why should i have 125 main jet and 150air isn´t 135man and 155 air stock?

Ok.. thanks for answeres but i have not gottten any suggestions for jetting yet. i bought 140 and 145 main today.. the shop didn´t have 142.5 main or 45 pilot jets, but ordered. my new settings in the carburator is 140 main and airscrew - 3 turns out as the shop said that anti clockwise for...

Hmm okey.. Well but I does seem to work for a lot of people tough.. How about jetting what is original for soch xs400 special? From what I've read 135 is main on my bike but a lot of people say 142.5 is original.. And now mine is 125...so should I try 135 or 145 main ? With open filters?

Hi I'm new to this forum and bought myself a nice xs400 which is about to be modified to a nice white brat style machine.. Well I want suggestion for jetting with following setup. Now Air box with original exhaust but some Otis silencers? Are they perfomance silencers? Same shape and design as...