Kat clocks with GSXR wheel

[spondonturbo]

Hi, putting a GSXR 1100 front end in my Katana. Is it possible to get the Katana speedo to run off the GSXR wheel and drive? Anyone done this?

[Captain Chaos]

I've got the EFE speedo working correctly on a Slingy wheel and speedo drive. But the Katana has a 19" wheel, so if the drive is also different from an EFE or a Slingy one (different reduction) it might work.

[FBJ]

If memory serves me right. You will have to machine a little from the outside of the speedo drive. 

Like captain Caos said it wont be that acurate. But you can calibrate it by eye. Thats what i do. 

[spondonturbo]

I've got the EFE speedo working correctly on a Slingy wheel and speedo drive. But the Katana has a 19" wheel, so if the drive is also different from an EFE or a Slingy one (different reduction) it might work.

yea, its the wheel size difference that I think is going to be the problem as a 17" wheel is going to be spinning faster than a 19" wheel at the same road speed

[Nigkat]

yea, its the wheel size difference that I think is going to be the problem as a 17" wheel is going to be spinning faster than a 19" wheel at the same road speed

As said before You can just recalibrate by eye. At least you will be on the safe side for speed cameras. You gotta keep the clocks an essential part of of Kat me thinks.

[spondonturbo]

I agree about keeping the clocks, just need to make them work if possible. If its not possible, I will do what you and John are suggesting, cheers

[Gammaboy]

Yeah, my 18" front wheel with Kat speedo drive makes my Slabby clocks read about 10% high (reads ~110 at 100). I should really investigate slotting in a slabby speedo drive.

Edited December 8, 2015 by Gammaboy

[wraith]

I've got a GSXR1100K front end with the GSXR speedo drive on my Kat with the standard Kat clocks (it's not a Kat without the Kat clocks - LOL) and they're not that far out. Riding next to the car and the clocks read 55mph and the car is 50mph. I know this gap will increase the higher the speed, but as said, you are the right side for the cops ;)

[Gammaboy]

I have a sneaky suspiscion that all the Suzuki speedo drives are the same drive ratio, and the calibration is done in the speedo itself...

[gsx]

Think he's right , the ratio from the wheel to the clocks works as long as the front wheel and drive match, 

 

[spondonturbo]

does not sound like there is a way of doing a conversion that is accurate and I want to keep the Kat clocks for the looks. Think I'll just hook them up and go and road test them with another bike and mark on the speed limits

 

[Gammaboy]

Figure out how much it's out, then send them off to be re-calibrated by a gauge specialist?

[spondonturbo]

Figure out how much it's out, then send them off to be re-calibrated by a gauge specialist?

didn't know you could do that? I was hoping there was a simple cost effective fix, like a different drive or a converter. anyone had clocks re calibrated?

[johnr]

but remember that the later sd model kats came with 16 inch front wheels, and used the same clocks as the ones with 19 inch wheels meaning that the difference must have been in the speedo drives, i reccon a 16 inch wheel with the fat tyre that the kat came with would have the same rolling diamiter as a modern 17 inch with a lower profile rubber.

[spondonturbo]

I thought it was only the Jap 750's that had 16" front wheels John?. Think I have a 16" front end somewhere and some Jap 750 clocks. maybe use the drive from the 16" front end?

[VJ]

I think the gearing commander website, al be it designed for sorting out final drive gearing, has a function for calculating the circumference of a tyre should you want to check johnr's idea, although my guess would be broadly simmilar

[Captain Chaos]

Tyre circumference is not difficult to calculate. Why do people need a programme or an app for the most simple tasks nowadays?

[VJ]

lazyness

[Nigkat]

Tyre circumference is not difficult to calculate. Why do people need a programme or an app for the most simple tasks nowadays?

tape measure.

[Captain Chaos]

tape measure.

if you have both bikes available, yes. But if you're sitting at work / at the in-laws for Christmas dinner / on the loo / in the church / wherever, not so much.

[Nigkat]

13 hours ago, captain chaos said:

if you have both bikes available, yes. But if you're sitting at work / at the in-laws for Christmas dinner / on the loo / in the church / wherever, not so much.

Yeah ok I`ll give you that.

[johnr]

caculating wheel circumference is as easy as pi,,,,,,,,


i'll get my coat......


and chris, no sd 750 and 1100s came with the 16 inch wheel, it was one of them odd 1980s fashion trends like your shellsuit or gaudy annodized allen bolts,,,,, or lairy painted spondon turbos,,,,,,

[spondonturbo]

7 hours ago, johnr said:

caculating wheel circumference is as easy as pi,,,,,,,,


i'll get my coat......


and chris, no sd 750 and 1100s came with the 16 inch wheel, it was one of them odd 1980s fashion trends like your shellsuit or gaudy annodized allen bolts,,,,, or lairy painted spondon turbos,,,,,,

My Kat 1100 SD has a 19" front, but maybe mine is different? and I love 80's paintjobs