GS tranny in a GT750 box

Post by **Suzsmokeyallan** » Tue Oct 13, 2009 8:36 pm

Aussie is not that hard to do, the trouble is i have to be around it to listen to it up front and personal, something thats not bound to happen where i live or visit closeby.
Give me some time around the 'die hard' Aussies and ill get most of the lilts to the accent down pat,,LOLOL
I'll bet a lot of you you wont get a full Barbadian accent figured out far less understood simply because its a fast talking dialect with a lack of crisp pronunciation at the same time.
Lets not even get into the bad grammer usage, 'local' slang words used, and all that goes with it.

Suzukidave · Post by **Suzukidave** » Fri Oct 23, 2009 1:56 pm

Ok , off the who came from where and back to GS vs GT trannys

now that the gear set is figured out now the clutch . The GS center clutch plate carrier is not as wide as the GT.

Suzukidave · Post by **Suzukidave** » Fri Oct 23, 2009 2:26 pm

And for good reason as Teaser pointed out the steel driven plates are thinner ( 1.6mm GS vs 1.9mm GT ) so with this info we stacked a GT clutch pack into a GT basket and measured and it show from the top of the stack to the top of the carrier is aprox 5mm

Suzukidave · Post by **Suzukidave** » Fri Oct 23, 2009 2:33 pm

Then the same GT carrier but with a GS clutch pack and we can see it is aprox 8mm or 2~3 mm shorter than the GT stack .

Suzukidave · Post by **Suzukidave** » Fri Oct 23, 2009 2:36 pm

1 set of steel and fiber is aprox 5mm so i can see by removing 1 or 2 mm from the base of the carrier it should be possible to add a 8th plate and 9th fiber useing the GS clutch pack in the GT clutch .. for what its worth

tz375 · Post by **tz375** » Fri Oct 23, 2009 3:35 pm

OR....

You could use a GS hub and use less plates and that would give you a little more space to the side cover.

Personally, I'd add plates.

One trick is to use a mix of Thick and thin plates to get the pack thickness you want. We do that on our race bikes - it's cheaper than springs for and allows for that "fractional fit".

Post by **Suzsmokeyallan** » Sun Oct 25, 2009 8:52 am

Richard what i showed Dave when we were looking at it on Thrusday night was to remove the equivalent off the lower face of the GTs inner basket and add then add in the plates to achieve the same end clearance for the spring cover.
Just eyeballing it, it was about a 1mm required skim to the friction face of the basket and the fingers on the outer looked like it would still clear too without having to dress them any.
This was of course using GS plates all around in the GTs clutch assy

tz375 · Post by **tz375** » Sun Oct 25, 2009 2:00 pm

I'm not sure I'd want to machine anything off the inner face of teh hub. We have to remember that the greatest force is absorbed by the inner plates and they tend to distort or break from the inside out.

All one needs to do is to buy a GS clutch (as long as it's cheaper than a set of plates) and mix and match GS and GT plates to get the pack thickness you want.

For the street almost anything is fine, but in a race bike, the thinner inner "plate" will have difficulty shedding heat.

I'd also draw an arbitrary line at 80 HP for the primary gears before you need to think about straight cut primaries.

I don't want to think about the side thrusts on a 120HP bike ridden hard

Suzukidave · Post by **Suzukidave** » Sun Oct 25, 2009 2:46 pm

tz375 wrote: I don't want to think about the side thrusts on a 120HP bike ridden hard

I will let you know Richard

Suzukidave · Post by **Suzukidave** » Sat Dec 12, 2009 4:21 pm

I got my lazy ass moveing today while it pours down rain outside and started on the case assembly ( i know finally ) did the sleeve bearing swap on 1st gear to a tighter fitting bearing out of a GT gear so it fits the GS output shaft with a LOT less slop so thats another thing you might look into if doing this tranny swap . It has been a long time sense i have put together a GT bottom end and i had forgotten how tricky it is to get all the seals , bearings and O rings in place and on there locating studs and not forget anything

Buffalo-guy · Post by **Buffalo-guy** » Thu Feb 04, 2010 10:36 am

Dave.
Do you know if the gearset from an 80-82 GS is the same as the earlier ones? They are readily available, and I wouldn't mind scoring one for future considerations. Seems to me they were the same bottom end, with the 4V top end added. With the extra power, they may be heat treated differently. Just a thought. Cheers.
Fred

tz375 · Post by **tz375** » Thu Feb 04, 2010 6:24 pm

Fred,

The tranny I bought that we measured was from an 81, so the answer is YES. It will work.

Post by **oldjapanesebikes** » Thu Feb 04, 2010 6:30 pm

Suzukidave wrote:

Good to see you also make use of that one indispensable tool that we all keep handy in our tool boxes - a butter knife !

Suzukidave · Post by **Suzukidave** » Thu Feb 04, 2010 10:01 pm

Richard you did say though that with the later GS tranny the output shaft was even longer ?

tz375 · Post by **tz375** » Thu Feb 04, 2010 10:30 pm

The GSXR 6 speeds are longer. The shafts I measured when we worked through all the dimensions was the same. Or at least that's how I remember it.

I tried two different GSXR sets and then I bought a really cheap GSX750 81 set that I remember as working fine with the Suzukidave mods