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Display Mesage #112890


6 speed transmission project ...
Written by spacetiger_j... on 5/10/2012 at 02:30 am

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 #112890

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