Re: Yamaha xs400 (Tracker/dual sport) EXHAUST UPDATE!
Def fairly tight.
Im not sure what i would do, first part that concerned me a little but is prob not a concern is the closeness of pipes to carby body itself re heating up the bowl after riding for a while ?
Next thing i would check which im not sure effects bigger capacity 4 strokes that much is the length of the distance between carby and filter, most manufactures design it how they see works best with the particular motor and get a tuned length etc.
Im guessing you dont want to just run pod filters directly off carbys ? they will prob fit but not best if bike is going to see some dirt / water.
If it was me id see what stock motor/bike airbox was like in overall capacity and distance from carbys and try to replicate that although will obviously have to be a different shape and prob longer in length for space available.
Being a mono shock really makes my idea buggered (just clicked) as i was thinking a Y piece to join carbs to one central inlet then a narrow but long airbox. - wont work
other way depending on plastics etc could you try running old school side filters using rubber elbows & Brackets ?
All really depends on exactly what the bike is to be once built, if never going full offroad etc id prob settle for small pod filters directly onto carb for now and continue to research other ideas in future.
Good luck mate, look forward to seeing other ppls advice and what path you head down. Intended use of bike would def give ppl a better idea of what options are ideal
