happiness is 3 teeth.......... - Kawasaki Versys Forum
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post #1 of 44 (permalink) Old 04-25-2009, 05:39 PM Thread Starter
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happiness is 3 teeth..........

I was reading about the hassles of changing out the front sprocket so I went about curing the speedo error problem by changing out the rear instead. Before the change, my speedo was out (read fast) by about 9% and after a 3 tooth reduction 46 >43, it is spot on (according to GPS). No need to shorten the chain and/or special tools, just take off the rear wheel (one nut) and spin off six nuts on the sprocket, replace sprocket , do up the same 7 nuts , adjust the chain and we're done!!! no need for pictures.......lol

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post #2 of 44 (permalink) Old 04-25-2009, 08:19 PM
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Did you find a steel rear sprocket or is it aluminum?

When you get a chance would you please let me know how many rpm's you're now turning at 70mph?
I'm at 5,000rpm at that speed and would like to spin it a tad less but still have good grunt.

Thanks,
Dan
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post #3 of 44 (permalink) Old 04-25-2009, 10:36 PM
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Nice Scoot...You gotta a part # and supplier....Many Thanks...D

If I new what I was doing, I wouldn't still be working
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post #4 of 44 (permalink) Old 04-26-2009, 12:32 AM Thread Starter
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details rr sprkt

The sprocket I used is a Vortex 452AK-43 ....A= aluminum and K= black
JT also makes them to fit in Steel: # 478 -43 see their web page here:
http://www.jtsprockets.com/52.0.html...el_uid=1138&p=

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post #5 of 44 (permalink) Old 04-26-2009, 12:53 AM
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Kimpex (Canada) sells "R.O.C." rear steel sprockets in 39, 40, 41, 42, 43, 44, 45, 46 and 47 tooth, as listed for EX560-A Ninja 650R. They're thinner at the core, and a bit lighter than stock... 15/43 is 6.98% taller than stock 15/46 sprockets, and 16/46 is 6.67% taller than stock. I found the 16/46 to be a bit too tall last year, so I just installed a 45 rear ROC with stock 15 front sprocket, for a resulting ~5% taller than stock, with taller 150/70 TrailAttack rear, close to 15/44 (+4.55%) with stock 150/60 rear.
Scooter650- You now have to add about 6% to your odometer and trip meter to get actual mileage... Can your GPS track the actual distance covered, or just in a straight line between two points?
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post #6 of 44 (permalink) Old 04-26-2009, 06:35 AM
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Good info..........thanks guys,
Dan
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post #7 of 44 (permalink) Old 04-26-2009, 07:23 AM
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The problem with aluminum sprockets is that they wear very fast. I had a vortex black aluminum sprocket on my ZX6R and it only last about 6000-7000 miles.
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post #8 of 44 (permalink) Old 04-26-2009, 08:14 AM
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post #9 of 44 (permalink) Old 04-26-2009, 12:02 PM
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My GPS is always on my bikes so I use the speed on it if for some reason an accurate reading it needed. Yes a GPS will cover distance traveled not straight line distance. Good to know it can be corrected but did you notice any performance hit?

ST1300, Versys, SV650S
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post #10 of 44 (permalink) Old 04-26-2009, 03:09 PM Thread Starter
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actual mileage should now be correct........

Quote:
Scooter650- You now have to add about 6% to your odometer and trip meter to get actual mileage...
With the sprocket change, the speedo is now acurate,IMO if anything, the mileage put on so far is over by 6% and is now reading accurate. Both speedo and odo use the same sensor as far as I know......

as far as performance, I like it a little better since there's less shifting around town.

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post #11 of 44 (permalink) Old 04-26-2009, 08:51 PM
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Your speedometer is now accurate. Your odometer and trip meter which were accurate with stock sprockets, are now under actual mileage covered by about 6%. You just need to add 6% to your indicated trip mileage, to get actual mileage. Mileage accumulated on the odometer up to when rear sprocket was changed, is pretty accurate. From now on, odometer logs about 6% less than actual mileage covered.

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post #12 of 44 (permalink) Old 04-27-2009, 09:27 AM
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5-335645 sprocket for 45T. buy one now and get a free countershaft sprocket.
Sunstar triple-works hard ano aluminum.
same part # as the ninja 650R
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post #13 of 44 (permalink) Old 04-30-2009, 08:01 AM
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Waited a few weeks for the 44t Vortex, which turned out to be for .530 chain

Just ordered a steel 43t, since so many of you seem to like the 2.8 ratio.

I'm more willing to try it with the rear 43, rather than using a front 16.

Probably another week or two, now....
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post #14 of 44 (permalink) Old 04-30-2009, 09:22 AM
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I finally got around to installing my SunStar steel 43T rear sprocket earlier this week. No riding yet other than around the neighborhood a few laps. We shall see.

All I'm looking for is a less hyper engine speed at 65-70 MPH (I've got a nice long trip coming up that includes 600 miles of superslab.)
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post #15 of 44 (permalink) Old 04-30-2009, 10:22 PM
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Went through our old sprocket box and found several rears from my youngest sons ZX6RR, everything from 39 to 46. After some experimenting I've settled on a 44 and it's the berries.
A tad slower off idle but will still wheelie even with the taller gearing and slightly longer wheelbase! :-)
It is more relaxed in high gear and that's what I was looking for.
I was gonna go with a rear steel but since these were used for dragracing they had very little wear and the Vortex brand looks great.........and they're free!
Dan
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post #16 of 44 (permalink) Old 05-01-2009, 06:59 AM
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Here's a noob question, why change the front if you can change the rear and achieve the same result? What is the difference between 16/46 vs. 15/43 (as far as ridability)? Previously, I've read posts about how riders like the 16T front, if changing to a 43T rear is easier then why change the front (other than it gets you in the garage longer and away from the wife and kids)
________
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post #17 of 44 (permalink) Old 05-01-2009, 08:49 AM
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Quote:
Originally Posted by furley View Post
Here's a noob question, why change the front if you can change the rear and achieve the same result? What is the difference between 16/46 vs. 15/43 (as far as ridability)? Previously, I've read posts about how riders like the 16T front, if changing to a 43T rear is easier then why change the front (other than it gets you in the garage longer and away from the wife and kids)
Two thoughts:

1) A rear sprocket can cost a little more.
2) A smaller rear sprocket would use up some of the chain adjustment (moves the wheel to the rear a bit. This may not be an issue if you end up with adjustment left when your chain and sprockets are worn out.

I have stock gearing. The only times that I've noticed high rpms in 6th gear, I've also noticed that I was exceeding the speed limit by about 30 mph.
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post #18 of 44 (permalink) Old 05-01-2009, 03:51 PM
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I prefer going to a larger front sprocket because it will be quieter and sprocket life will increase. Anything smaller than 15T with a 5/8" pitch chain is really a no-no. When chain wraps around a sprocket, it forms a polygon, and not a circle. The less angularity between adjacent links, the smoother the drive and the less wear on the chain and sprocket.
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post #19 of 44 (permalink) Old 05-01-2009, 03:58 PM
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Originally Posted by ttpete View Post
I prefer going to a larger front sprocket because it will be quieter and sprocket life will increase. Anything smaller than 15T with a 5/8" pitch chain is really a no-no. When chain wraps around a sprocket, it forms a polygon, and not a circle. The less angularity between adjacent links, the smoother the drive and the less wear on the chain and sprocket.
My offroad motorcycle (GasGas 280) has the stock 12 tooth countershaft sprocket and a 1/2" pitch chain. Most guys I ride with have replaced theirs with an 11 tooth! The chains seem to hold up fine for a dirt bike. Given that we ride in dirt and mud all the time we don't get near as many miles on a chain as a street bike.
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post #20 of 44 (permalink) Old 05-01-2009, 07:04 PM
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I'm think I'm gonna swap my rear out for the 43 soon... whats a good sprocket to go with?
In terms of price and reliability...


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