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Old 07-15-2009, 07:17 PM   #49
Blackbird
Member
 
Join Date: Dec 2008
Location: Lake Orion, Michigan
Posts: 80
Re: Needle shim modification

Quote:
Originally Posted by buck-gz
Quote:
Originally Posted by Sarris
I'm interested in hearing how much your gas mileage drops. Most report a 10+ mpg loss.

Okay. Post needle shim modification, I tracked my gas mileage. After many miles and several fillups, here are my results:

MPG per fillup:
==============
1. 68
2. 65
3. 65
4. 64
5. 65
6. 65

Average = 65.3

I was averaging between 65 and 70mpg before the modification. I am seeing about a 7% drop in gas mileage now.

I drive a regular commute each day and take joy rides over the same roads. Most of my driving is at speeds between 40-50 mph. Maybe 20% is open road, 50-55+ mph. The terrain I drive on is generally flat with some rolling hills.

I am very happy with the performance increase - the slight drop in mileage is small price to pay.
Buck GZ ...
I've done the needle mod, the air intake, the jetting and exhaust. I also put in a NGK Iridium spark plug. That coupled with the 16 tooth sprocket makes this a sporty bike. I know of no one that has done all of these mods and regretted it. My bike Raven has never ever complained to me. I still have a couple of add ons to do to make it my special buddy. Go for it! :rawk:
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