If you plan on upping the compression, what ratio will you use?  If you can go 
up to around 12.7, and add water injection, you will keep a clean engine and 
make about double your miles per gallon.  And you could use 87 octane to do it, 
not 105.
 




________________________________
From: Kurt Nolte <[email protected]>
To: [email protected]
Sent: Fri, October 15, 2010 6:21:41 PM
Subject: Re: [Nighthawk Lovers] Slightly OT... Fuel

I plan to, at some point, pick up a smaller motorcycle for a local
commuter. I will /probably/ be going for a small Nighthawk, probably a
two cylinder (250/450), or an older Triumph aircooled twin. It will
get taken apart and rebuilt to use E85, simply because I can get it
locally and I like the cleaner burning, low-oil fouling high
compression nature of the fuel. It's rated 105, and very consistently
high quality (the stations that carry it are Sphinx stations, and the
man who runs that franchise is very pro-alternative fuels).

I will very likely completely disassemble the carburetors, clean them
thoroughly, send them off to be anodized (again), and then have them
jetted to take the high ethanol fuel. Make plenty of adjustments and
all that. Compression bump, obviously, and whatever trick I can get to
advance ignition timing. We'll see if I destroy it with ethanol, I
suppose.

-Kurt

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