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Old October 10th, 2010, 08:55 AM   #1
JMcDonald
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Ordered 16/41 sprockets :O

I had been looking into sprockets for a while, just because so many people seem to say how much it improves the ride. But, I wasn't sure how much I wanted to do. However, after a while I realized I really like the longer length of higher gears, vs the initial snap of shorter gears. I get much more excited about pulling in (factory) 4th from 40-70 to get around some traffic, vs a run from through 1st and 2nd (it always feels disappointing to shift into 3rd and look around to see I'm barely pulling away from traffic, heh).

Most of the time I find myself shifting into 2nd from stops as soon as I am going fast enough to bypass the neutral finder, if I don't just leave it in 2nd altogether. It might take a little but more clutch work (not that it took a whole lot, even in 2nd) to get a good start on the rare occasion I need to quickly get ahead of traffic from a light or something, but I think it will be well worth it. Though, I never launch and have no real desire to bother, so I am not worried about any loses in performance from like 0-10mph. Besides, if I need to accelerate so quickly out of the hole that 1st is too long, I probably don't have enough room to safely do whatever I was trying to do anyways :P .

I will probably install the sprockets in a few days or perhaps next weekend and report back. I also ordered a dynojet kit and will be ordering a pod filter (K&N R-0990) and probably building a full exhaust. However, those won't be going on for a few weeks (all in the same weekend, along with painting ), so for the moment I will be all stock except removed snorkel and shimmed needles (which I think I over-shimmed, heh). All of those will hopefully help get some more peppiness back.

The combo is a bit over 25% faster for a given RPM. Speeds at 12500rpm, according to www.gearingcommander.com, will be increased by the following amounts (rounded to nearest whole, in mph)

1st: 35 to 44
2nd: 51 to 64
3rd: 64 to 81
4th: 78 to 98

From what I've read on here, True Top Speed (TTS) would be reached in 5th, say around 105mph (up from around 95 (104 indicated) being the fastest I've gone, with about 92 true being the typical TTS), at about 11500rpm. 110mph would be around 12100. 100mph would be about 12750 in 4th.

6th gear will be largely used for just cruising down the highways. 5th gear could be used as a half-way point between factory-6th and geared-6th, like for going up a steep incline or facing a good headwind. It will get very slightly over 10mph per 1000rpm (theoretical 102mph at 10k). So, it will be nice cruising at 7400 for 75mph, rather than the current 9200rpm, as it will hopefully reduce some vibrations going through the foot pegs (both front and rear pegs).

Where I would normally cruise in 6th at 45mph (5500) I will only need to get to 4th (5700rpm) for about the same cruising RPM.

I am excited that if I need to quickly pull out into traffic, I can be doing 40mph at about 11500 in 1st (and almost 46 by redline), vs doing barely over 30 at that RPM. In general, since I daily ride my bike and have to take a lot of short trips, I like knowing I can get going a little faster in each gear without having to rev up a cold engine. That way if, for example, I am trying to keep the RPMs below maybe 5000 for the first couple of stoplights, I will only have to go up to 4th rather than 6th to be at 40mph.

With this gearing combo the distance between sprockets only goes up by .38" . My chain adjustment is pretty far forward as is, so I shouldn't have any issues with running out of adjustment room.

When I do the install, I will post pics and might even try to make it a DIY to complement the current sprocket-swap sticky. If nothing else, I will definitely include pics and details on how to grind the sprocket cover (or how not to do it, if I destroy mine--or how to make a new one, if I destroy mine :P ).

My biggest concern is the odometer. If I am not mistaken, it will read 25% slower, if it doesn't get its reading from the front wheel. But, it would be technically off no matter what I did with the sprockets, so I will just have to keep track of this.
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Old October 10th, 2010, 09:45 AM   #2
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The speedometer and odometer get their reading off of the fron tire so the gearing will not change the indicated speed.
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Old October 10th, 2010, 02:11 PM   #3
JMcDonald
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Aah, I had read that the odo and speedo get their readings from different places, so i wasnt sure if it woukd be affected. I dd know the speedo wouldnt be affected though.
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Old October 10th, 2010, 03:16 PM   #4
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You may be thinking about the tach. It gets its reading from the CDI which has been known to be erratic on some bikes.
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Old October 10th, 2010, 06:33 PM   #5
JMcDonald
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No, I'm thinking of the Odo.

I got the hint from this thread:

http://www.ninjette.org/forums/showt...light=odometer

Quote:
Could the speedo be off, if the odometer is dead on?
...
Quote:
Originally Posted by 00NissanNinja View Post
Odometer should be right regardless of whether your speedo is right, since the miles traveled is measured differently from how your bike calculates speed
...
Quote:
Originally Posted by Alex View Post
Yup, they are unrelated.
But, if the ODO will not be off by any more than it already is, then that is just fine.
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Old October 10th, 2010, 06:59 PM   #6
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Umm pretty sure that a 16t front wont fit under the cover. Believe 15t is the largest can go on new gens.
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Old October 10th, 2010, 07:01 PM   #7
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Both the odo and speedo get their info from that same speedometer cable running to the front wheel. But the odo can still be relatively accurate while the speedo isn't; the mechanism for how things are measured coming off of that same cable is necessarily different.
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Old October 10th, 2010, 07:03 PM   #8
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10-4.

Yeah, the sprocket cover will need to be ground some, but the few people who have installed these have not reported much difficulty in doing this.
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Old October 11th, 2010, 09:18 AM   #9
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75mph @ 9200rpm? Isn't this a little high? I'm still new on my ninjette and its an FI model but mine does 75mph(120km/h) @ 8500rpm on standard gearing. Could the FI cause this difference?
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Old October 11th, 2010, 09:22 AM   #10
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More likely your speedometer is reading a little bit high. AFAIK, the gearing is identical from the FI to carbed bikes, so the actual engine revs per road speed would be identical.
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Old October 11th, 2010, 09:47 AM   #11
JMcDonald
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Yeah, with the average speedo error being around 8-10%, it would make sense that when your speedo is indicating 75mph, your tach would be the same fraction lower than it would be at actual 75mph.

Yeah, hopefully the sprockets will be installed this weekend. I think I will be happy with it right off, but I think I will really be able to enjoy it once I get started tuning the carbs, as I'll hopefully get little more crispness at the very bottom, allowing me to pull a little more smoothly from lower RPMs and from stops.
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