Yet another Carb Virgin. Questions follow!

Very subjective thing aftermarket exhausts and re-jetting, generally I'd say not, some people claim not to have had to with various brands but it could be that their bike ran rich before it was fitted/their air filter is blocked/they live on a mountain in thinner air etc or even they just don't care.

IIRC somebody did have a thread somewhere about MAC pipes & they were pretty close, but I'd suggest whatever exhaust you fit to keep a close eye on plug chops and decide whether to upjet or not then (not the end of the world if you do have to, bonus if you don't).

I'll have a look for that thread and link it so you can see what was said there

 

http://xjbikes.com/Forums/viewtopic/t=41735.html

Here it is, gets a bit off topic at the end & it turns out to be the sellers NOT a MAC user who say no re-jetting. As I said on that thread, all that can be said with any certainty is "you MAY need to re-jet" :?
Sorry

 

Next question! i wish there was some way to edit the title of this thing. I went to change my front breaks, got tire and rotor off. brake piston extended for some reason. I CANNOT push it back in. I have tried numerous methods. anybody else have this problem?

 

The Caliper Piston needs to be Square and True before pressed back into the Caliper.
Before pressing the Piston back-in, ... inspect the Caliper's Main Seal Locating Channel.
It needs to be spotlessly clean.

Reinstalling the Caliper Piston.
Use a C-clamp and a Socket.
Place a Large Socket inside the Caliper Piston.
Use two layers of Cereal Box Cardboard taped to the Caliper to prevent scratching the Logo.
Tape a Quarter over the Square on the end of the Socket.
Spread the C-clamp such that it will fit onto the Quarter and Caliper.
Lube the Piston with clean Brake Fluid.
Begin tightening the C-clamp while keeping the Piston squared-up.

Slowly compress the Piston back into the Caliper by tightening the C-clamp until the Piston is seated.

(Remove the Bleed Screw before re-seating the piston)

 

is there something i can spray on and use to clean? as it is pretty gunked up. some sort of lube? WD40 or something, just something with a bit of pressure than i can spray and clean it up, might help me fix it?

 

AutoZone or Auto Parts Store

BrakeKleen
Disc Brake Kleen
Brake Clean

 

well guys, fired her up and its on the road! pretty happy i did it, even though i felt pretty overwhelmed sometimes. however, now im getting a bit of a clicking sound from what sounds like under the valve cover. i did change 2 shims, anybody experienced this?