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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.



Message Thread for message #112890