What gearbox is this? - Suzuki GSX-R Motorcycle Forums Gixxer.com
 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 08-31-2016, 10:25 AM Thread Starter
Lifetime Premium
 
-JK750-'s Avatar
 
Join Date: Apr 2008
Location: Finland
Motorcycle: K5 1000 & K1 750
Posts: 3,476
What gearbox is this?

Does anybody recognize this gearbox? I can take better pics.
Gear ratios are the same as Yoshi Type A ratios. The seller didn't know the manufacturer.





-JK750- is online now  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 08-31-2016, 04:37 PM
You should listen to me. No, seriously, listen to me.
 
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Posts: 7,500
Re: What gearbox is this?

I'm not sure I understand your question. Don't the ratios strongly suggest that it's the Yosh 320-506-0000 wide ratio transmission? As I understand it, there's an "A" mark on it somewhere, possibly on each gear. Or are you trying to determine who made them for Yosh? Was anyone else independently making gixxer transmissions? VERY pricey.

FWIW: My analysis indicates that the K5/K8 OEM transmission would have smoother spreads if 1st gear was 42/16. But that's unlikely to ever be available.
BillV is offline  
post #3 of 8 (permalink) Old 08-31-2016, 09:55 PM Thread Starter
Lifetime Premium
 
-JK750-'s Avatar
 
Join Date: Apr 2008
Location: Finland
Motorcycle: K5 1000 & K1 750
Posts: 3,476
Re: What gearbox is this?

I would like to if this really is Yoshimura gearbox as the ratios suggest. I could only find some markings on the gears (e.g. 104 2R).
I'll need to take a closer look at the gears...
-JK750- is online now  
Sponsored Links
Advertisement
 
post #4 of 8 (permalink) Old 09-01-2016, 11:51 AM
You should listen to me. No, seriously, listen to me.
 
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Posts: 7,500
Re: What gearbox is this?

Hard to tell but it looks like this:

but with some missing small bearings on the shaft ends and an iffy looking output shaft oil seal (both should be minor items).

The main issue is do you need a wide ratio transmission. Note that even though it's referred to as wide ratio, the spreads are much narrower than the OEM ratios. The overall spread (1st to 6th) is 1.839 vs 2.019 for the OEM. Your pics don't seem to show it but I'd be checking for mods like drilled gears, ISF, or undercut dogs.
BillV is offline  
post #5 of 8 (permalink) Old 09-01-2016, 01:54 PM Thread Starter
Lifetime Premium
 
-JK750-'s Avatar
 
Join Date: Apr 2008
Location: Finland
Motorcycle: K5 1000 & K1 750
Posts: 3,476
Re: What gearbox is this?

Definitely not need one, more like nice to have part.
I got it for a good price, not much more than a used oem gearbox.
I think this should be pretty much spot on for the track I usually go. Stock 1st is a bit too short and 2nd too tall.
-JK750- is online now  
post #6 of 8 (permalink) Old 11-15-2017, 01:02 PM Thread Starter
Lifetime Premium
 
-JK750-'s Avatar
 
Join Date: Apr 2008
Location: Finland
Motorcycle: K5 1000 & K1 750
Posts: 3,476
Re: What gearbox is this?

Finally going to install this gearbox this winter. Aftermarket gearbox is ~350g lighter than stock gearbox.
Attached Thumbnails
Click image for larger version

Name:	IMG_20160831_175446.jpg
Views:	3
Size:	62.3 KB
ID:	530106   Click image for larger version

Name:	IMG_20160831_175458.jpg
Views:	3
Size:	50.4 KB
ID:	530114   Click image for larger version

Name:	IMG_20160831_175544.jpg
Views:	4
Size:	49.7 KB
ID:	530122  
-JK750- is online now  
post #7 of 8 (permalink) Old 11-15-2017, 02:29 PM
You should listen to me. No, seriously, listen to me.
 
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Posts: 7,500
Re: What gearbox is this?

Do you have any idea where the weight reduction comes from? I'd assume that the bearings are the same. Or are they ceramic? I guess that the gears could be undercut or the drive shaft could be drilled.
BillV is offline  
post #8 of 8 (permalink) Old 11-15-2017, 09:54 PM Thread Starter
Lifetime Premium
 
-JK750-'s Avatar
 
Join Date: Apr 2008
Location: Finland
Motorcycle: K5 1000 & K1 750
Posts: 3,476
Re: What gearbox is this?

Gears are drilled and dogs are undercut.
-JK750- is online now  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Suzuki GSX-R Motorcycle Forums Gixxer.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome