Exhaust mod

While my bike is sitting out the Ohio winter, I'm thinking about
changing the exhaust on my 750 Vulcan using Vance and Hines Cruzers.
Not having done this before, will it require any rejetting in the
carburetors?
Any help or comments are appreciated.

 

Maybe

 

Exhaust mod

Group: rec.motorcycles.tech Date: Sun, Dec 21, 2003, 10:50pm (EST-3)
From: (rile)

Vance and Hines can answer your question better than anyone. Be aware
that it's hard to beat a stock exhaust for overall performance.

 

That answer just might be of some help...possibly...maybe...I think...but
not sure....?

 

I once changed the exhaust on a Vulcan 800, and had it rejetted for the
sake of precaution. Rejetting is a fairly inexpensive process, so I
would bring it to the Kawasaki dealer following exhaust installation to
be safe than sorry.

But, I assume you could attempt riding with the new exhausts without a
rejetting and just see how it runs. It shouldn't hurt the bike, but you
will notice if it has changed for the worse (hesitant acceleration,
backfiring, etc).

 

(note - rearranged to bottom posting to make more readable)

IF the exhaust system that is installed has instructions to the effect
that rejetting is not required, the above answer is correct.

OTOH, if no such statement is made there is a worst case scenario
of severely lean running. Lean running can cause nasty things like
holes in your pistons and wallet.

At least make a general inspection of the spark plugs after
riding the new system a few miles (of course including some at
"WFO") to look for tell tale signs like glazed isolator tip, width of
clean ring on centre electrode ("detonation ring" IIRC) or aluminium
spots on the side electrode.
Another way is to make sure the engine responds to
throttle opening at high speed all the way to wide open, a main jet
that is to small will not be able to supply enough petrol and power
will drop off instead of increasing.