Breaking in a new engine / aftermarket exhaust

[Jayy]

Couple questions I wonder what others think about...

1) Do you stick to low RPMs in the run in period or just nail it? (I know, I know, had this many times but here it is again).

2) Would sticking an aftermarket Austin Racing can on a bike from day one do any harm to the run in period?

[P.addy]

I'd run it hard and do about 3 oil changes between 50 miles and 250 miles.

I'd also swap the exhaust instantly. You don't seem.to have bikes too long, so problems won't likely occur in your ownership.

[Daz1245]

I remember buying a brand new cagiva mito 125 back in 2002 and guy from dealer said don't go over 5000 revs for first 1000 miles and soon as I got out of dealer onto the road bike went into nutural instead of 2nd and I revved it hard by accident and I red lined it ooops, bike was fine and still managed about 13,0000 miles before had to rebuild engine(2 stroke)
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Current: 1994 Suzuki rf600r
Cagiva mito evo 3 2002, Yamaha xvs125 2000, skyjet sj-125 Chinese piece of crap

[Jayy]

[UrbanRacer]

[davethekwak]

Exhaust - assuming the aftermarket exhaust reduces back pressure and lets the engine breath more then there are two possibilities.
EFI bike - no issue as the MAF will detect increased airflow and increase fuel to compensate keeping mixture pretty much correct.
Carb bike - reduced exhaust back pressure will lean the mixture slightly unless the carb is rejetted. Lean mixture is not good for new engines as they will generate more heat until run in anyway. Add in extra heat from lean mixture and things could go a bit bad.
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ZX6R G2 (1999) & ZX6R F2 (1996). I like ZX6!

[Jayy]