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Display Mesage #112899


6 speed transmission project ...
Written by yankeesmuggler on 5/10/2012 at 03:08 pm

I would not know what to do with a 6th speed. I used to have 6 on my
Kawasaki Concours and I was always shifting and no matter where I
stopped there always seemed to be one more gear to go. What a PITA!

Tim Davies
Seneca Falls, NY
Yankee Smuggler II 1998 (150,000+ mi)

IPCRC #4
AMA #688662

"The ride is the objective, the destination is the excuse!"

On May 9, 2012, at 10:30 PM, Jerry wrote:

> So its taking forever to get the parts in, so I thought I'd get an
> early start on the upcoming winter project - getting a 6 speed
> transmission into the PC.
>
> Okay, technically, it is a 5 speed transmission with overdrive.
> Point is, it is 6 forward speeds.
>
> The donor bike is a 86 VT700. From 1984-1987 this bike came with a
> 5 speed + OD transmission. The VT800 followed with only a 4 speed
> but was tuned for more torque/HP and the 5+1 TX was deemed not
> necessary. Our PC800 followed in 89 and had a 5 speed TX. In my
> research of this engine line, I found many common parts between the
> VT700/800/PC800 engines, not so much with the VT1100 because of the
> difference in power output. I then started looking at the price of
> parts on ebay for the VT700/800 and found them to be surprisingly
> reasonable. The 5+1 transmission cost $35 and included free
> shipping. I found an engine case for the VT800 and VT700 for a
> little over $100, so I thought this was a reasonable cost to try
> and see if this swap was doable. I have a spare PC800 engine.
>
> I will have to do a bit more research on other gearing changes it
> might make sense to do as I will try to mod the engine a bit for a
> little more power. I will have to map out the overall gearing
> ratios so I get a match so the new 5th geat matches the PC5th gear
> giving me a true 6th or O/D gear.
>
> So, I will do play with this project a bit between parts delivery
> as I work to get the PC rideable. I will finish the transmission
> swap on the spare engine and once done, swap engines in the PC
> during the winter.
>
> :-)
>
> Jerry
>
>

Message Thread for message #112899

spacetiger_j...
5/10/2012, 02:30 am
6 speed transmission project ...
So its taking forever to get the parts in, so I thought I'd get an early start on the upcoming winter project - getting a 6 speed transmission into the PC. Okay, technically, it is a 5 speed transmission with overdrive. Point is, it is 6

    glennschechter
    5/10/2012, 05:29 am
    6 speed transmission project ...
    Anybody wanting to try what Jerry is doing, I have very good spare engine w/ 9,001 miles for sale. I cant lift it by myself so you need to come and get it. Its in Rock Hill SC. I want $600.00 for it and its alot cleaner then the one on E-bay.

      wynndungey
      5/10/2012, 01:38 pm
      6 speed transmission project ...
      Interesting project. My first bike was a CJ360T Honda. Kick start, 5 speed version of the CB360 engine. The transmission was virtually identical without the 6th gearset. Think I counted a total of 5 parts to make the CJ a six speed. Never got

    yankeesmuggler
    5/10/2012, 03:08 pm
    6 speed transmission project ...
    I would not know what to do with a 6th speed. I used to have 6 on my Kawasaki Concours and I was always shifting and no matter where I stopped there always seemed to be one more gear to go. What a PITA! Tim Davies Seneca Falls, NY Y

      revconprince
      5/10/2012, 05:49 pm
      6 speed transmission project ...
      The biggest problem with the PC is not the number of gears, but the gear spacing. Normally tight spaced gears are needed for narrow power bands. The PC has a extremely wide power band, so it does not need tightly spaced gears. I find I'm cons

        bobb_todd
        5/10/2012, 08:21 pm
        6 speed transmission project ...
        Personally I think it’s a worthy idea but won’t it be more work than a VT rear end ? I can’t imagine you needing to do both Bobb Todd Owen Sound, Ontario

    spacetiger_j...
    5/11/2012, 01:44 am
    6 speed transmission project ...
    The intent is to get lower RPM at cruising speed. Stock is ~4,000 RPM at 60; at 70 you are closer to 4,600 RPM. You can swap to the VT1100 and RPM ~10%. I think this a good cost effective change. The only down side is this changes the ove