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Warning! Fat people are harder to kidnap.
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Each tooth on the front is like 2 and 3/4 on the rear so 4 teeth will probably be too much. The hard pull through the gears will be much softer. You speedo will be off major because it reads off the countershaft. Stock motor will seem slow with that gearing and may not go any faster. Only benefit better fuel economy in top gear. My XR tops out at a little over 120. I had to get accustomed to riding a Sportser instead of a big Harley. How often do you hit top end? Without some so of wind protection it's a very windy place to be. :D Later,
 

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It aint no good locking the doors, when the madnes
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7,305 Posts
As i type i am waiting fpr a 38 tooth engine sprocket and new primary chain, they are winging their way to me from the US thanks to one of our compadres on this very forum, as soon as i have fitted them i will let you know.

Here are a couple of charts that show the difference in gearing courtesy of Folkie on the other forum, i asked him to do them for me......cleaver bugger that he is.

Top one is stock and the lower one is with 38 tooth.

Billy, as far as i can work out it shouldnt make any difference to the speedo as the reading is taken after the gearing change and not before, if you changed the front pulley on the final drive then i would expect a speedo difference.

Part numbers for this mod are.....

30029-08 Rotor with Sprocket
40147-04 Primary Chain
4589 Bolt



Code:
XR1200 09+ HDI
 
Gear   Ratio  ←                                Engine Revs                               →
              1000  1500  2000  2500  3000  3500  4000  4500  5000  5500  6000  6500  7000
 
1     10.782   6.9  10.3  13.8  17.2  20.7  24.1  27.5  31.0  34.4  37.9  41.3  44.7  48.2
2      7.702   9.6  14.5  19.3  24.1  28.9  33.7  38.6  43.4  48.2  53.0  57.8  62.6  67.5
3      5.728  13.0  19.4  25.9  32.4  38.9  45.4  51.8  58.3  64.8  71.3  77.7  84.2  90.7
4      4.748  15.6  23.4  31.3  39.1  46.9  54.7  62.5  70.3  78.2  86.0  93.8 101.6 109.4
5      4.071  18.2  27.3  36.5  45.6  54.7  63.8  72.9  82.0  91.2 100.3 109.4 118.5 127.6
Code:
XR1200 09+ HDI, 38 Tooth Engine Sprocket
 
Gear   Ratio  ←                                Engine Revs                               →
              1000  1500  2000  2500  3000  3500  4000  4500  5000  5500  6000  6500  7000
 
1      9.647   7.7  11.5  15.4  19.2  23.1  26.9  30.8  34.6  38.5  42.3  46.2  50.0  53.9
2      6.891  10.8  16.2  21.5  26.9  32.3  37.7  43.1  48.5  53.9  59.2  64.6  70.0  75.4
3      5.125  14.5  21.7  29.0  36.2  43.4  50.7  57.9  65.2  72.4  79.7  86.9  94.1 101.4
4      4.248  17.5  26.2  34.9  43.7  52.4  61.2  69.9  78.6  87.4  96.1 104.8 113.6 122.3
5      3.643  20.4  30.6  40.8  50.9  61.1  71.3  81.5  91.7 101.9 112.1 122.3 132.4 142.6
 

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Warning! Fat people are harder to kidnap.
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1,373 Posts
Scotty, When he said motor sprocket I figured it was countershaft being form the other side of the "pond". Don't you know? (sounds British, yeah?) Still waiting on your primary gear project and results. :cool: Later,

P.S. Don't think the stock or close to stock engine will pull the taller gear. Smoking the 600's off the corner will be gone I fear. I guess it'll be film @ 11:00
 
G

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Scotty, When he said motor sprocket I figured it was countershaft being form the other side of the "pond". Don't you know? (sounds British, yeah?) Still waiting on your primary gear project and results. :cool: Later,

P.S. Don't think the stock or close to stock engine will pull the taller gear. Smoking the 600's off the corner will be gone I fear. I guess it'll be film @ 11:00
The Buell Xb12XT uses the 38 tooth engine sprocket and it pulls all the gears just fine, There is no reason the XR1200 shoud be any ddifferent. I plan on putting the 38 tooth on my bike soon as I get the parts. The final gear ratio on the Buell is 3.61 and the XR will be a 3.64.
 

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It aint no good locking the doors, when the madnes
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7,305 Posts
P.S. Don't think the stock or close to stock engine will pull the taller gear. Smoking the 600's off the corner will be gone I fear. I guess it'll be film @ 11:00
Fast action throttle and the correct revs in the correct gear coming out of the corners, its gonna be just fine Billy :D


Is 11 00 the only time of the day you guys get films on TV??......Billy, call the cable guy ;)
 

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WTF???
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15,967 Posts
The Buell Xb12XT uses the 38 tooth engine sprocket and it pulls all the gears just fine, There is no reason the XR1200 shoud be any ddifferent. I plan on putting the 38 tooth on my bike soon as I get the parts. The final gear ratio on the Buell is 3.61 and the XR will be a 3.64.
How much does the Buell weigh?
 

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WTF???
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15,967 Posts

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A few roos short in the front paddock
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88 Posts
one option

Big Doug of N.Z. has performed an alteration to the gearing.This was done by changing the drive pulley. When altering the gearing at the primary recallibration of the speedo will not be required. The S& S recallibratioon product costs Au $160-00. I will alter the gearing at the primary as per Scotty.
I tried around Oz to get get the parts but no luck. If anyone knows of decent pricing please advise.:)
I refer to Doug's post
"http://www.xr1200ownersgroup.com/site/showthread.php?t=100&highlight=john&page=3"

02-06-2009
BIG DOUG

Where men are men and sheep are nervous
Join Date: Feb 2009
Posts: 48



I have fitted a 30t pulley to my xr,and yes the speedo was out,but I just fitted an s+s speedo calibrator and all is good it droped the revs 250-300 I did this as I commute 80kms a day every day and at 110-115 ks it was quite buzzy as for driveability I only notice it taking off from the lights I ain't going to to win any drag races,but if you do fit the pulley you will have to grind a bit off the casting ribs inside the cover as it will rub on the belt but apart from that an easy mod.
 

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It aint no good locking the doors, when the madnes
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7,305 Posts
The main reason I'm doing this alteration to the gearing is when i am on our motorways 80-90 mph the XR is reving 4500 and 5000 rpm which is to high for cruising, it should come down about 500 rpm at 80 which is better and i dont honestly think it will make a huge diference to the bikes character.
It will still be reeving higher than a stock XL1200 because they have a 29 tooth front final drive pulley as compared to our 28 tooth on the XR
So its gonna be somewhere in the middle between a XL and an XR but you also gotta remember that the XR has slightly higher compression than the XL so its all gonna be good...

Even more so when one of you Merican folks takes your bike over to NRHS and let them figure the best way to get some more power outa these things!!!!
 

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Carbon Fibre Hooligans
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569 Posts
The main reason I'm doing this alteration to the gearing is when i am on our motorways 80-90 mph the XR is reving 4000 and 5000 rpm which is to high for cruising, it should come down about 500 rpm at 80 which is better and i dont honestly think it will make a huge diference to the bikes character.
It is only high compared to other Harleys. With a rev limit of around 7000 an 80mph 'cruising' rpm of 4-5000 isn't bad at all to me, and I wouldn't want to lose the acceleration by fitting a larger front pulley.
 

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It aint no good locking the doors, when the madnes
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7,305 Posts
After having jumped on an XL1200 the other week to have a see what the diference is i aint got a problem with it, keeping in mind the UK XL's (30 tooth) have an even bigger front final drive pulley than the US model (29 tooth) and the XR being 28 tooth.
All thats gonna happen is the torque band is gonna kick in slightly later than before which is gonna be ok for me as i push this thing very hard all of the time.......We'll see, but I'm sure its gonna be fine, after all the way i see it they geared the XR more for a track feel in the first place. If you look at it from a track point of view it would be like gearing it for a different circuit where it needed a faster top end for long straights.
Well thats my way of thinking anyhow.
 

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Warning! Fat people are harder to kidnap.
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1,373 Posts
adrenalin-moto, What gearing do you run on your road racers and how fast are they top end? When I first got my XR I thought it was geared way too low. Once I became accustomed to it I'm ok with it. At 70 mph I'm at 4000 rpm and in the middle of its torque band. Compaired to my superglide it is low but the superglide is really too high. adrenalin-moto is anyone going to come out with a 6 speed? Then you could have an overdrive for lower revs. Just thinking of how to spend more money. I got it no more cheap beer! :D Later,
 

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It aint no good locking the doors, when the madnes
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7,305 Posts
It is only high compared to other Harleys. With a rev limit of around 7000 an 80mph 'cruising' rpm of 4-5000 isn't bad at all to me, and I wouldn't want to lose the acceleration by fitting a larger front pulley.
I just changed my original post, i put 4000 at 80 mph, it should have been 4500 at 80 mph doh!

Ideal cruising rpm should be around 3000 so this mod will get me half way there.
 
G

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I just changed my original post, i put 4000 at 80 mph, it should have been 4500 at 80 mph doh!

Ideal cruising rpm should be around 3000 so this mod will get me half way there.
It seems to me that the XR seems to lug a bit a little at 3,000. I've found it a bit more responsive at 3500-4,000 rpms, which is why I don't shift into fifth unless I'm running around 65 mph.

I've been reading a bit of Reg Pridmore's "Smooth Riding", which advocates keeping the engine revved up a bit to help with bike control and ability to accelerate out of trouble better. That's why I like 4,000 on the XR.
 
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