Sprocket / Chain setup question

[ctandc]

So I have a 91 Kat 600 which now has a 01 Kat 750 engine.

I used the 14/46 (112 link) setup that was on the 600.

I'm turning almost 6500 RPM at 70-ish (Commute cruise RPM)

I want to swap to the 15/45 setup.

Can I get away with the 112 link setup or will I need a longer chain?

[arsenic]

in theory you'll be fine. In the real world I don't know.

[ctandc]

in theory you'll be fine. In the real world I don't know.

That's kinda what I figured, since I don't have the longer 750 swingarm, it's kinda up in the air.

For every tooth added to the rear you add one link right? What about adding a tooth up front?

I wanna get the RPM's at highway speeds down a bit....gas mileage is suffering and that will offset any loss with the Ivan's kit I'm going to put in shortly....

[elkat]

You still have the same amount of teeth either way, you are just moving them around. The chain should be fine with the stock links.

[Mat0302]

you should be fine.

I went from a 15/45 setup to 16/43. the tire ended up a notch or two back from the original setting.
It dropped my rpms about 1000 at highway speeds

gas mileage is goin to change much if any at all. your rpms are going to be lower trying to fight the drag.

[ctandc]

you should be fine.

I went from a 15/45 setup to 16/43. the tire ended up a notch or two back from the original setting.
It dropped my rpms about 1000 at highway speeds

gas mileage is goin to change much if any at all. your rpms are going to be lower trying to fight the drag.

yeah but remember, I'm geared lower than stock now. I'm just going to stock for the 98+ 750.

I'm turning almost 6500 RPM at 70 mph.

Looks like I'm getting around 35-40mpg

[arsenic]

no you're not 14/46 IS stock for pre 98 600's

[Psycho1]

Not sure what stock gearing was for the 98+750, but he did say "I'm just going to stock for the 98+ 750" not stock pre-600.

[Mat0302]

yeah but remember, I'm geared lower than stock now. I'm just going to stock for the 98+ 750.

I'm turning almost 6500 RPM at 70 mph.

Looks like I'm getting around 35-40mpg

stock 2001 750 motor with 15/45 will get you around 43-47 mpg
add Ivan's kit, pipe, and advancer and you will get around 38-42 mpg

all this with my 16/43 setup still gets me 38-40 mpg.

I was turning 6800 rpm at 80 mph, with the new setup I'm turning 5900 at 80 mph. the nice thing about the sprocket change is that it corrected my speedometer. You will notice a tad loss in torque, but the engine has a lot of pull. the bike really starts to move with what it seems like no effort.

I have dyno results and basically this is what happened:
2006 750 with advancer, pipe, and stock 15/45 sprockets
86.8 hp at 10,146 rpm - 47.87 lb torque at 8,163

advancer, pipe, Ivan's kit, and 16/43 sprockets
86.2 hp at 9,787 rpm - 48.47 lb torque at 7,928

The Ivan's kit gives more low-mid torque taking away from top end.
The sprockets are giving more top end taking away torque.

It was give a little here, take a little there.
The benifits I feel I received is I'm reaching my peak at lower rpms. I also got the pesky midrange vibration out of the stock motor and my speedometer is corrected. I also like cruising the interstates at 80 using less than 6000 rpms. one other benefit I like is I was either winding out 1st gear making turns, or having to shift to 2nd in the middle of the turn. now I can use 1st through the turn and pull out before shifting to 2nd.

[ctandc]

no you're not 14/46 IS stock for pre 98 600's

And remember I swapped in a 2001 750 engine...so YES I'm geared LOWER than the stock 15/45 with my pre 600 setup of 14/46

Not sure what stock gearing was for the 98+750, but he did say "I'm just going to stock for the 98+ 750" not stock pre-600.

Yes..I have a pre 600 bike, but a post 98 750 engine.

2001 750 Kat was 15/45

1991 Kat 600 was 14/46

[arsenic]

And remember I swapped in a 2001 750 engine...so YES I'm geared LOWER than the stock 15/45 with my pre 600 setup of 14/46

no, you're not. You don't base gearing on the engine, you base gearing on the swing arm and rear rim. You have a pre 600 swing arm and god only knows what rim you have, so face it dude, you're not geared lower, anything else you'd like to tell me I'm wrong about?

[Mat0302]

not saying your wrong, but what does the swingarm have to do with it? and I know the pre rim is thinner, but doesn't it take the same tire?

[arsenic]

the pre 600 swing arm is 1 1/2 shorter or 15%, yes the rim does take the same tire. The generation use a different sprocket hub, doesn't make a whole lot of difference, maybe like 2.5% or something. CP can answer this way better then I could, I'll PM him.

[Mat0302]

it's cool, just wondering, but the % thing makes sense

[The CyberPoet]

I wanna get the RPM's at highway speeds down a bit....gas mileage is suffering and that will offset any loss with the Ivan's kit I'm going to put in shortly....

Then don't put in a jetkit. PERIOD.

Cheers,
=-= The CyberPoet