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Old 10-09-2012, 03:26 AM   #3162
Mr Grumpy
Old Git.
 
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Joined: Aug 2006
Location: Collonges, Ain, France.
Oddometer: 99
I can't state to Guzzis, but I know that on my Buells there was a significant "hole" between 3000-4000 rpm,
The cause is the stock exhaust being set up for all the, economy, noise & polution settings at that rev range, a free-er flowing exhaust will remove the hole.

I presume the same constraints apply to Guzzi, so that may be the trouble.
I'd think that unless you're putting on a straight through race-pipe, the injection shouldn't need touching, but I'm not an expert.

I don't know about the Fat Duc sensors particularly, but it stands to reason that if you inject more fuel per cycle to improve performance your mpg will suffer.
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