Trans Swap

Post by **FZRDude** » Sun Jan 15, 2006 10:52 pm

Here are some numbers that I have of the differences between the FZR1000 5 speed and the YZF750 6 speed (I do not know if it is a SP or R trans).

FZR1000 5 speed (Ratio spread 2.47)
-------Output---Input---Ratio
1st --- 36 t ---- 14 t --- 2.57
2nd -- 32 t ---- 18 t --- 1.78
3rd -- 29 t ----- 21 t ---1.38
4th -- 27 t ----- 23 t ---1.17
5th -- 28 t ----- 27 t ---1.04

YZF750 6 speed (Ratio spread 2.373)
------Output---Input---Ratio
1st --- 36 t --- 14 t --- 2.57
2nd -- 33 t --- 17 t --- 1.94
3rd --- 28 t --- 18 t --- 1.55
4th --- 26 t --- 19 t --- 1.36
5th --- 28 t --- 23 t --- 1.27
6th --- 26 t --- 24 t --- 1.08

Anyone care to comment, as to what this means in the real word, to those of us that have no clue.

Yes, I know I'm going to be shifting a little more often, but what is it going to do to my final drive ratio? (17f, 49r) Will I see a significant change in rpm's?

Post by **Hooligan** » Mon Jan 16, 2006 12:33 am

if you can tell me how you came to these numbers, i can do the same and post the info for the sp tranny. i have one waiting to go in.

Post by **FZRDude** » Mon Jan 16, 2006 1:42 am

I counted each tooth on each gear on each shaft. I then matched each gear on one shaft to the corresponding gear on the other shaft. The order of gears in relation to actual gear being used was a little difficut to get my tiny little brain around, but I'm still thinking on it.

For the FZR 5 speed, working in from the clutch side of the input shaft, it goes 1st, 4th, 3rd, 5th, 2nd.

For the YZF 6 speed, working in from the clutch side of the input shaft, it goes 1st, 5th, 4th, 3rd, 6th, 2nd.

We test fitted the trans in a bare case and it spun nicely. Everything looks to be in good shape.

dragracer1951 · Post by **dragracer1951** » Mon Jan 16, 2006 8:34 am

take output teeth divided by input teeth....gives gear ratio
The six spd is geared a tad shorter on the 2 thru 6 gears and the ratios are a little closer.

ExupElvis · Post by **ExupElvis** » Mon Jan 16, 2006 8:44 am

The six spd is geared a tad shorter on the 2 thru 6 gears and the ratios are a little closer.

Yup.................
And the 1rst/2nd gear positions are inverse from the lables also Tim.
First is actually the closest to the clutch hub on the input shaft, second is all the way across towards the drive sprocket.

Post by **FZRDude** » Fri Feb 24, 2006 1:55 pm

Alrighty..... I'm going down to the garage and start working on striping down the bike. Photos to follow.

I'll try my damnedest to keep it updated and with as many pics as I can throughout the whole process.

Post by **FZRDude** » Sun Feb 26, 2006 5:08 pm

A little bit at a time. Bummer that I have to go to Vegas next weekend, as I'd rather work on the bike....

straygator · Post by **straygator** » Sun Feb 26, 2006 6:13 pm

Hey Tim, was just looking at your pics, looks good, and I saw those carbs waiting to swallow stuff ... thought I'd pass on a nice solution of 4 little soft toy balls that stuff in there with a perfect fit. Cheap too.

Post by **FZRDude** » Tue Feb 28, 2006 12:44 am

I hope to have the engine out Tuesday evening as well as the frame disassembled.

gatecrasha · Post by **gatecrasha** » Wed Mar 01, 2006 9:58 pm

looking good tim matey,

dont tell me you have finally caught the bug
and are having a go at streetfightering it

sounds like your enjoying the build

which is always a good thing

Post by **Hooligan** » Wed Mar 01, 2006 11:29 pm

tim, yours looks almost as bare as mine.

i'll have to dig up some pics i have. the forks and triples came off recently. now to just drop the motor...

Post by **FZRDude** » Wed Mar 15, 2006 12:08 am

All I have left to do with the frame is figure out how to take the swingarm bearings out. Motor's going down to Elvis for disassembly on Sat. If luck is with me, I'll have it all back together by the end of the month.

willi · Post by **willi** » Wed Mar 15, 2006 2:29 am

ALL THAT AND SOME FOR 1 EXTRA GEAR. WILL BE INTERESTING TO SEE IF U THINK ITS WORTH IT OR NOT.

Post by **FZRDude** » Wed Mar 15, 2006 2:56 am

willi wrote:ALL THAT AND SOME FOR 1 EXTRA GEAR. WILL BE INTERESTING TO SEE IF U THINK ITS WORTH IT OR NOT.

Of course it is going to be worth it, Willi. I was starting to have problems with 2nd popping out of gear, so I had to do something to repair it. If I can replace it AND get an extra gear for $150 (complete 6-speed trans), why would I pass it up?

willi · Post by **willi** » Thu Mar 16, 2006 1:36 am

FZRDude wrote:
willi wrote:ALL THAT AND SOME FOR 1 EXTRA GEAR. WILL BE INTERESTING TO SEE IF U THINK ITS WORTH IT OR NOT.
Of course it is going to be worth it, Willi. I was starting to have problems with 2nd popping out of gear, so I had to do something to repair it. If I can replace it AND get an extra gear for $150 (complete 6-speed trans), why would I pass it up?

true

thaut u wer doin it for the sake of it.

Post by **FZRDude** » Thu Mar 16, 2006 4:33 am

Goodness Gracious, no... Had talked about how nice it'd be to have the extra gear, but never thought that I'd actually have to do it.

So here we go.....

Post by **FZRDude** » Sun Mar 19, 2006 6:46 pm

dragracer1951 · Post by **dragracer1951** » Sun Mar 19, 2006 7:05 pm

Somebodies been burnin a lil oil.....

Ya know, you can cure that if'n ya Big Bore it!!

Simonsi · Post by **Simonsi** » Sun Mar 19, 2006 7:41 pm

Interesting pics

Keep us posted.

How much oil was it burning and what`s the mileage on your bike?

Post by **FZRDude** » Sun Mar 19, 2006 8:20 pm

Just a tad over 30K miles.

The only time that "I noticed that it burned oil" was on my trip to California. A 2800 mile trip and it needed about 1/2 liter, and that was about 1700 miles into the trip. Regular round town riding, it doesn't seem to be burning it.

I won't be getting any pics tomorrow, but I hope Bob does take time out to sanp a couple. Should be done by the weekend.