speed/revs any answers - Wrist Twisters
 
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post #1 of 12 Old 04-05-2010, 02:27 PM Thread Starter
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speed/revs any answers

Hi there, i hope to get a 900 hornet this year, right now i ride a 600 hornet,today out on the bike i was doing 70 mph @5000 revs what would the 900 rev at doing the same speed? the 600 feels like it wants to go faster even though im in top gear.would be nice to have that extra gear to calm things down a little as it gets tiresome at times on long journeys,hence im looking at more cubes,as yet i have not been on a 900 but looking forward to it.

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post #2 of 12 Old 04-05-2010, 02:38 PM
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Mine goes + 80 mph (true mph with gps) but I have + 1 at the front sprocket
Good luck with your future Hornet

Hans - DK

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post #3 of 12 Old 04-05-2010, 02:41 PM
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rpms and speed

I have one more tooth on the front sproket, too....and about 80mph at 5000 rpms seems about right.

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post #4 of 12 Old 04-05-2010, 03:20 PM
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are you talking indicated speed or actual speed? 70 MPH on the speedo is ~4,200 RPM. However, the actual speed (if running stock gearing) is more like 65.

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post #5 of 12 Old 04-05-2010, 05:10 PM
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I fall in to the 80mph is around 5k... if you want I'll do a GPS test tomorrow and find out what RPM the bike runs at 70mph

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post #6 of 12 Old 04-05-2010, 05:58 PM
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Quote:
Originally Posted by grandwazoo View Post
Hi there, i hope to get a 900 hornet this year, right now i ride a 600 hornet,today out on the bike i was doing 70 mph @5000 revs what would the 900 rev at doing the same speed? the 600 feels like it wants to go faster even though im in top gear.would be nice to have that extra gear to calm things down a little as it gets tiresome at times on long journeys,hence im looking at more cubes,as yet i have not been on a 900 but looking forward to it.
IF you have stock gearing about both your tach and speedo are correct, below is what you should see. (It's a print of an XL Sheet I got from 919.org
My tach over reads by about 2 %.
My speedo over reads by more (and is soon to get a Healer)

INPUTS
Front Sprocket (Teeth) 16 Stock = 16
Rear Sprocket (Teeth) 43 Stock = 43
Rear Tire Diameter (inches) 24.51 See notes below

919/Hornet 900 Gear Calculation

GEAR 1 2 3 4 5 6
Front Sprocket (Teeth) 16 16 16 16 16 16
Rear Sprocket (Teeth) 43 43 43 43 43 43
Tire Circumference (Inches) 77.001 77.001 77.001 77.001 77.001 77.001
Primary Drive 1.520 1.520 1.520 1.520 1.520 1.520
Final Drive 2.688 2.688 2.688 2.688 2.688 2.688
Internal Gear Ratio 2.769 2.000 1.600 1.368 1.227 1.130
Overall Gear Ratio 11.311 8.170 6.536 5.588 5.012 4.616
% Step to higher gear 28% 20% 15% 10% 8%
GEAR 1 2 3 4 5 6
RPM MPH MPH MPH MPH MPH MPH
3,850 25 34 43 50 56 61
5,000 32 45 56 65 73 79
6,000 39 54 67 78 87 95
7,000 45 62 78 91 102 111
8,000 52 71 89 104 116 126
8,500 55 76 95 111 124 134
9,000 58 80 100 117 131 142
9,100 59 81 102 119 132 144
9,200 59 82 103 120 134 145

Note: To measure tire circumference roll bike and measure the length of one revolution of rear wheel. Then divide measurement by 3.1416 to calculate diameter.
Note: Bridgestone's web pages give the following tire diameters -- BT56 (OEM tire for the 919) & the BT010 180/55 = 24.7"

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post #7 of 12 Old 04-06-2010, 01:11 PM Thread Starter
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Thankyou for all your replies,
it was an indicated read on my 600,with standard sprockets.
mcromo44 big thanks for that info,cheers.
hope i havent made everyone do 70mph everywhere,dont get a ticket its not my fault ok

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post #8 of 12 Old 04-06-2010, 01:40 PM
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If you get a 2002 919 they are faster.

"Towards the end of the vid, it looks like she may have had a bafflectomy." - MarylandMike
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post #9 of 12 Old 04-06-2010, 04:09 PM
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Quote:
Originally Posted by HondaJim View Post
If you get a 2002 919 they are faster.
Do you know what the engine and/or engine management differences are ?
I've never seen anything definitive.
Any insights you can make would be appreciated.

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post #10 of 12 Old 04-06-2010, 04:24 PM
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Quote:
Originally Posted by mcromo44 View Post
Do you know what the engine and/or engine management differences are ?
I've never seen anything definitive.
Any insights you can make would be appreciated.
No clearcoat finish = less weight = faster.

"Towards the end of the vid, it looks like she may have had a bafflectomy." - MarylandMike
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post #11 of 12 Old 04-06-2010, 04:31 PM
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919 gearing Excel spreadsheet

Simply plug in your sprocket numbers & tire diameter

http://www.919.org/host/919gear.xls

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post #12 of 12 Old 04-06-2010, 09:24 PM
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Quote:
Originally Posted by Lord Duckhunter View Post
919 gearing Excel spreadsheet

Simply plug in your sprocket numbers & tire diameter

http://www.919.org/host/919gear.xls
this is the one I found ages ago and still use
LDH did a nice job way back on this, and I just changed it to use on the 600 and 750 as well as the 919.
It makes gearing calcs nice and easy.

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