DSM1290 Posted September 3, 2008 Report Share Posted September 3, 2008 I want to change sprokets and get a new chain at the same time. How do i figure out what length of chain i need. I have an 89 ZX600. I'm putting a 13t and a 48t on it. That's 2 smaller in the front and 9 more in the back. Thanks for any help Quote Link to comment Share on other sites More sharing options...
kinkinhood Posted September 3, 2008 Report Share Posted September 3, 2008 Probably around a 116 link chain, maybe a 120. It is a 112 stock. Out of curiousity any reason you're deciding to go with those numbers? Quote Link to comment Share on other sites More sharing options...
kenny Posted September 3, 2008 Report Share Posted September 3, 2008 -2/+9... would make stock gearing 15/39 15 + 39 = 54 13 + 48 = 61 61 - 54 = 7 7 / 2 = 3.5 = 4 (round up to nearest even number) Add 4 links to the length of the stock chain. Quote Link to comment Share on other sites More sharing options...
DSM1290 Posted September 3, 2008 Author Report Share Posted September 3, 2008 Thank you for your help. Those are the biggest and smallest ones i could find. Quote Link to comment Share on other sites More sharing options...
kinkinhood Posted September 4, 2008 Report Share Posted September 4, 2008 Planning to go stunting around in a parking lot? Quote Link to comment Share on other sites More sharing options...
DSM1290 Posted September 4, 2008 Author Report Share Posted September 4, 2008 i thought stunters used like 6X or 7x rear sprockets? Quote Link to comment Share on other sites More sharing options...
kinkinhood Posted September 4, 2008 Report Share Posted September 4, 2008 Stunters don't tend to change the front, only the back. On average for every 1 tooth you remove off the front is similar to adding 3 to the back. With the settings you're going for your top end will probably be crap but the front of the bike will pull up with little effort Quote Link to comment Share on other sites More sharing options...
kinkinhood Posted September 5, 2008 Report Share Posted September 5, 2008 But it'll have rather good acceleration<G> Quote Link to comment Share on other sites More sharing options...
kenny Posted September 5, 2008 Report Share Posted September 5, 2008 If I knew the gearbox ratios on that bitch I'd do the math for a laugh. Quote Link to comment Share on other sites More sharing options...
Mattsn2o281 Posted September 5, 2008 Report Share Posted September 5, 2008 Looks like 15/40 is stock, ratios are, from 1st on down: 2.92 2.06 1.63 1.38 1.21 1.08 Quote Link to comment Share on other sites More sharing options...
DSM1290 Posted September 5, 2008 Author Report Share Posted September 5, 2008 Well i don't really want to go a 140+. I would just like to get to a 100 or so as quickly as possible. But do you think it will be overkill? Quote Link to comment Share on other sites More sharing options...
kenny Posted September 5, 2008 Report Share Posted September 5, 2008 What's the primary? Quote Link to comment Share on other sites More sharing options...
kenny Posted September 5, 2008 Report Share Posted September 5, 2008 Around 8,500rpm at 75mph. What's the redline on that turd? Quote Link to comment Share on other sites More sharing options...
Guest tbutera2112 Posted September 5, 2008 Report Share Posted September 5, 2008 Around 8,500rpm at 75mph. What's the redline on that turd? Quote Link to comment Share on other sites More sharing options...
kenny Posted September 5, 2008 Report Share Posted September 5, 2008 mine spins 7500rpm at 75... but it also makes power to 14,800... Quote Link to comment Share on other sites More sharing options...
DSM1290 Posted September 5, 2008 Author Report Share Posted September 5, 2008 Umm, yes. Your chain and sprockets will wear out faster because of the drastic change on the front...the lower the teeth, the more bending the chain has to do, therefore generating more heat and friction. It's much more wear and tear on the motor...especially one that's 19 years old! You will run much higher temperatures because of the high RPM's You will go through a lot more fuel Your first few gears will almost be unusable Yes, you'll have quicker acceleration, but it will also come at the expense of fighting to keep the front end on the ground (at least in the lower gears) You'll make a whole lot more noise even at street speeds because your RPM's will be much higher...which will scream out "I'm speeding...pull me over" In the 20+ years I've worked in the motorcycle industry, I don't think I've ever once seen somebody make that drastic of a gearing change, especially on a 600. But...it's your decision. So your saying it's a bit much. What about just changing the front and leaving the back alone. Or changing the back and leaving the front alone. Is it better of more efficient to change one over the other? Quote Link to comment Share on other sites More sharing options...
kenny Posted September 5, 2008 Report Share Posted September 5, 2008 If you want to go faster, buy a faster bike. Quote Link to comment Share on other sites More sharing options...
DSM1290 Posted September 5, 2008 Author Report Share Posted September 5, 2008 Well i can either spend like $100 on new sprokets and be quicker or I can speed a few grand on a new bike. I will stick with the cheaper options right now. And half the fun is working on your bike. But thanks for the input. Quote Link to comment Share on other sites More sharing options...
kenny Posted September 5, 2008 Report Share Posted September 5, 2008 or one down and two up Quote Link to comment Share on other sites More sharing options...
kinkinhood Posted September 5, 2008 Report Share Posted September 5, 2008 I'd say do the increase on the back. From what I've heard you can increase the back's size without adding too much extra wear easier than removing from the front. Umm, yes. Your chain and sprockets will wear out faster because of the drastic change on the front...the lower the teeth, the more bending the chain has to do, therefore generating more heat and friction. It's much more wear and tear on the motor...especially one that's 19 years old! You will run much higher temperatures because of the high RPM's You will go through a lot more fuel Your first few gears will almost be unusable Yes, you'll have quicker acceleration, but it will also come at the expense of fighting to keep the front end on the ground (at least in the lower gears) You'll make a whole lot more noise even at street speeds because your RPM's will be much higher...which will scream out "I'm speeding...pull me over" In the 20+ years I've worked in the motorcycle industry, I don't think I've ever once seen somebody make that drastic of a gearing change, especially on a 600. But...it's your decision. Only place I've seen it is on parking lot stunters where they don't tend to ever go above 20. Quote Link to comment Share on other sites More sharing options...
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