winter rebuild

[wera917]

wow you've been busy!

[TJS]

I forgot how long it takes to drill every bolt and safety wire!

[TJS]

Got it running today! Just need to fix the headlight.

[TJS]

I'm stopping the post build here.....no more $$$!

Maybe next winter or over the next few winters:

Paint tank and panels silver or black with a racing stripe.
3 mm big bore kit
GSXR 400 cams
Small head and valve job
Pingel cam chain adjuster
Pingel petcock
re-wire and hide connections
Corbin / Sargent seats
33mm FCR carbs

[TJS]

Scotts on and lookn pretty! Things to do .....later.

[bullet5]

She looks great matey.  Love the front end tool bag

Now get out there and make her dirty again

[TJS]

Problem 1: I was having some chain rub problems on the certain tires
Problem 2: Chain rub on the shift rod.

Solutions to Problem 1: Front sprocket measurements were good from the machinist. 3mm off rear sprocket hub was wrong for alignment. I am now using stock oem rear sprocket hub from a '94/'95 gsxr 750. Note RF 900 is the same hub.

Solutions to Problem 2: I can go to having my local machinist make a 14t front sprocket and/or change rear sprocket from 47 to 45 to change the chain angle.

I have a 45t rear on order.
I don't want to pay for another special front sprocket; if I can help it.

[El Gringo]

Hi TJS

Thanks for your thread and the info in it.

I'm about to embark on putting a GSXR600 K4 swingarm and wheel in the back of my 19 400 and i was just looking into the chain run issue.

On the rear hub, was the 3mm machined off the face the sprocket sits on?

I've been working out what 520 sprockets i can get, i think 45/46 is biggest rear 520 conversion i can find, was probably looking to run 13/46 if possible.

Would the 13t solve the front gear selector issue?

Cheers and many thanks again

Chris

[TJS]

13t or 14t front would work. What you machinne off or don't machine off for the rear sprocket will be determined by how much of a kick you can machine for a front sprocket. See my threads on sprockets or previous build thread.

[TJS]

..by the way 13T would be very small. That could cause gearing issues on the highway. The small turn radious could also put a lot of stress on your chain and motor. If you use a 13T; get the best chain you can afford and keep it lubed!

[El Gringo]

I had wondered about that, i was looking for a little more acceleration so it would be a bit down on top end.

Biggest Rear GSXRK4 Sprocket i could find was a 46 which put it back somewhere near stock ratio.

Will be interesting to see, i may have an issue with machining the rear hub down, there isn't much to take off the front of this particular hub unlike the older type wheels.

I know unique is having an offset front made by Talon, i may give them a call and see if they can replicate it

Cheers

[TJS]

Installed the 45t and it helped. I could have stuck with the 47; if I wanted to run a tighter chain. I tend to run a loose chain for my weight, riding style, and putting my wife on the back.
I will be getting a 14t front to give me more gearing options.
Note, that the bigger wheel does lower your gearing. So, even though I was running stock gearing of 15t and 47T; the bigger rear wheel is like running a 49t or 50t. If I go with the 14t front; then I will probably move to a 43 rear.

[TJS]

Chain clearance with the '94/'95 gsxr oem sprocket hub and stepped out front sprocket.

[Unique]

I will be getting a 14t front to give me more gearing options.
Note, that the bigger wheel does lower your gearing. So, even though I was running stock gearing of 15t and 47T; the bigger rear wheel is like running a 49t or 50t. If I go with the 14t front; then I will probably move to a 43 rear.

I thought 14t was stock on b4, though mine is 1989 bike. I stayed with 14t on the new offset sprocket for gearing reasons as well as the same reasons quoted and that there not much room around the front sprocket to do much else.
 
I had wondered about the bigger rear wheel and the effect it has on the gearing and reasons in-part we went with the rear 45t.

[TJS]

15t front and 45t rear and ...NO rubbing!  not on the shift shaft or tire.