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25000 miles later on the VT1100 experiment
Written by spacetiger_j... on 9/30/2010 at 02:19 am

Anton,

I made this swap because of your previous work. Thank you for your efforts, as
I didn't have that thought on my radar screen. I have found this mod to be very
worthwhile.

Here is what I found:
1. RPM is down in every gear, a little over 8%
2. Gas mileage is up a bit - but I did not make the swap for improved mileage.

I made the swap for for relaxed riding at highway speed. When I saw the HP and
Torque curves, I knew the drop in RPM would not be that noticeable - especially
at highway speeds. Before the swap, it would pull almost 4,000 RPM at 60. Now,
its a bit over 3,500 RPM. At 70, I turn almost 4,200 RPM. The bike runs at more
relaxed pace.

Jerry


--- In ipcrc@yahoogroups.com, "athet94703" <aflcio@...> wrote:
>
> I've now had the thing 3 years and put just shy of 30000 miles on it. As the
first person to do the VT1100 final drive swap, (and that I haven't checked in
here for a while...) I thought I'd give an update.
>
> First of all, it's the same old cam-seal leaking, dodgy 3rd gear bike its
always been. The VT1100 gearing gives a consistent 45mpg, and that's with no sub
airbox lid and a lot of rejetting, leading to 51hp.
> I'm a few hundred miles short of 100000, and will probably be putting a
replacement engine in it this winter, as the transmission has been shaky the
whole time I've owned this bike. That said, it hasn't gotten any worse in 30k
mi...
>
> So if you are thinking about re-gearing your PC, I would recommend it, with
the caveat that some rejetting and perhaps some stronger clutch springs would be
a good idea.
>
> If you spend a lot of your riding time in town it might not be worth it, but
if you do many highway miles it extends the mileage and comfort zone 5-7mph,
which is enough here in the SF Bay area to be adequate in traffic.
>
> -Anton
> 1990 PC800 99780mi 'Junk in the Trunk'
> 150/90/15 ME880, VT1100 3.08 gears, 152/155 main jets, needles shimmed 2mm,
air box sub lid removed, stock pilot jets, fuel screws 4 turns out. Front lower
bodywork by TAP Plastics, Rifle screen.
>