Changing Belt Pulley
Road Master
Joined: Jul 2006
Posts: 886
Likes: 4
From: Virginia
If you go to the Andrews 30 tooth front sprocket and the Japanese belt (1 tooth less) the final drive ratio is 2.97. At 65 mph it's 2628 rpm. Better!
I've been checking and the 07 and up sportsters run a 68 tooth rear sprocket and a 1" wide belt just like our 07's and 08's. Our stock is rear is 66 tooth. So if you go with the Andrews 30 tooth front sprocket and change the rear to the 07 Sportster's 68 tooth sprocket you end up with a final ratio of 3.07. At 65 mph it's 2707 rpm. I think that lets us run in 6th gear down the highways. 244 rpm greater then stock. With 75 mph at 3124 rpm. This is were I think these heavy bikes should be geared. The belt center distance would be within a 1/16" of the stock belt center distance, so the stock belt should work.
Now you won't be able to run the IDS, and I'm looking at adding the SE compensator in the primary to offset this.
I have ordered all the parts but won't be getting to it till next month.
Last edited by Hog Yild; Sep 22, 2009 at 10:55 AM.
Grand HDF Member
Joined: Dec 2007
Posts: 4,999
Likes: 55
From: Bay Area
I'm working on that now. the stock final drive is 2.79. In 6th gear at 65 mph it's running 2463 rpm. Way too low.
If you go to the Andrews 30 tooth front sprocket and the Japanese belt (1 tooth less) the final drive ratio is 2.97. At 65 mph it's 2628 rpm. Better!
I've been checking and the 07 and up sportsters run a 68 tooth rear sprocket and a 1" wide belt just like our 07's and 08's. Our stock is rear is 66 tooth. So if you go with the Andrews 30 tooth front sprocket and change the rear to the 07 Sportster's 68 tooth sprocket you end up with a final ratio of 3.07. At 65 mph it's 2707 rpm. I think that lets us run in 6th gear down the highways. 244 rpm greater then stock. With 75 mph at 3124 rpm. This is were I think these heavy bikes should be geared. The belt center distance would be within a 1/16" of the stock belt center distance, so the stock belt should work.
Now you won't be able to run the IDS, and I'm looking at adding the SE compensator in the primary to offset this.
I have ordered all the parts but won't be getting to it till next month.
If you go to the Andrews 30 tooth front sprocket and the Japanese belt (1 tooth less) the final drive ratio is 2.97. At 65 mph it's 2628 rpm. Better!
I've been checking and the 07 and up sportsters run a 68 tooth rear sprocket and a 1" wide belt just like our 07's and 08's. Our stock is rear is 66 tooth. So if you go with the Andrews 30 tooth front sprocket and change the rear to the 07 Sportster's 68 tooth sprocket you end up with a final ratio of 3.07. At 65 mph it's 2707 rpm. I think that lets us run in 6th gear down the highways. 244 rpm greater then stock. With 75 mph at 3124 rpm. This is were I think these heavy bikes should be geared. The belt center distance would be within a 1/16" of the stock belt center distance, so the stock belt should work.
Now you won't be able to run the IDS, and I'm looking at adding the SE compensator in the primary to offset this.
I have ordered all the parts but won't be getting to it till next month.
Grand HDF Member
Joined: Mar 2007
Posts: 4,928
Likes: 285
From: Edmond Oklahoma
I'm working on that now. the stock final drive is 2.79. In 6th gear at 65 mph it's running 2463 rpm. Way too low.
If you go to the Andrews 30 tooth front sprocket and the Japanese belt (1 tooth less) the final drive ratio is 2.97. At 65 mph it's 2628 rpm. Better!
I've been checking and the 07 and up sportsters run a 68 tooth rear sprocket and a 1" wide belt just like our 07's and 08's. Our stock is rear is 66 tooth. So if you go with the Andrews 30 tooth front sprocket and change the rear to the 07 Sportster's 68 tooth sprocket you end up with a final ratio of 3.07. At 65 mph it's 2707 rpm. I think that lets us run in 6th gear down the highways. 244 rpm greater then stock. With 75 mph at 3124 rpm. This is were I think these heavy bikes should be geared. The belt center distance would be within a 1/16" of the stock belt center distance, so the stock belt should work.
Now you won't be able to run the IDS, and I'm looking at adding the SE compensator in the primary to offset this.
I have ordered all the parts but won't be getting to it till next month.
If you go to the Andrews 30 tooth front sprocket and the Japanese belt (1 tooth less) the final drive ratio is 2.97. At 65 mph it's 2628 rpm. Better!
I've been checking and the 07 and up sportsters run a 68 tooth rear sprocket and a 1" wide belt just like our 07's and 08's. Our stock is rear is 66 tooth. So if you go with the Andrews 30 tooth front sprocket and change the rear to the 07 Sportster's 68 tooth sprocket you end up with a final ratio of 3.07. At 65 mph it's 2707 rpm. I think that lets us run in 6th gear down the highways. 244 rpm greater then stock. With 75 mph at 3124 rpm. This is were I think these heavy bikes should be geared. The belt center distance would be within a 1/16" of the stock belt center distance, so the stock belt should work.
Now you won't be able to run the IDS, and I'm looking at adding the SE compensator in the primary to offset this.
I have ordered all the parts but won't be getting to it till next month.
That is some impressive research.
Beary
Road Master
Joined: Jul 2006
Posts: 886
Likes: 4
From: Virginia
I had my old SERT upgraded to TSS MasterTune and that will take care of the speedometer offset.
I'm planning on increasing the torque of this motor so the SE compensator and heavier clutch spring for that reason.
It looks like November before I can get this done.
Keep in mind, I haven't found anyone that has done this, but researching and then talking to a couple HD mechanics, I felt confident enough to order the parts. I'll ring in after I have it all installed.
Last edited by Hog Yild; Sep 22, 2009 at 07:59 PM.
Road Captain
Joined: Oct 2007
Posts: 673
Likes: 4
From: Charlotte NC
30 tooth pulley
Stock belt won't work. As you know the speedometer and odometer will be off. Mine is off 7%. 7miles/100 and about 6mph over my GPS speed. I have tried two calibrators now. Dakota Digital and yellow box. Both of them work flawlessly to correct the error. The problem is your cruise if you have it or your 6th gear indicator will not work until you back off the recalibration till they come back on and then the question is why bother to have it. The only way to fix the speedo is to use one of the fuel management systems out there such as TTS from Master tune with software in it that addresses speedometer recalibration.
On the up side the pulley change gave me a great performance boost and I only did the 31 tooth pulley. The stock belt worked with it.
You'll like it.
On the up side the pulley change gave me a great performance boost and I only did the 31 tooth pulley. The stock belt worked with it.
You'll like it.
Thread Starter
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Ultimate HDF Member
Joined: Oct 2005
Posts: 7,279
Likes: 56
From: Union Bridge, MD
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Road Master
Joined: Oct 2006
Posts: 1,125
Likes: 23
From: Mishawaka,Indiana
This has been done before but the posters say you still have the rocks in the can noise without the ids. I am considering the dd7 baker as a last resort, all the ratios are changed except 7th (1-1) which allows you to cruise 75 at 2500 rpm. mike
Road Master
Joined: Jul 2006
Posts: 886
Likes: 4
From: Virginia
Ok I received the 07 Sportster rear pulley yesterday and it measures up identical to the 07 Ultra stock rear pulley, with two exceptions.
1. the flange, where the 7/16" bolts go thru, is .50" thick instead of .90" so shorter bolts are required, or cut down the stock ones.
2. the obvious, 68 teeth instead of 66 teeth.
So the Andrews 30 tooth front pulley and 07 Sportster 68 rear pulley = 98 teeth and the stock belt works, with about a 1/16" difference in center distance. The final drive ratio = 3.07.
This ratio is higher then the EVO Industries 30 tooth primary motor sprocket ratio of 3.15 and lower than the Evo Industires 49 tooth primary clutch sprocket or Andrews 30 tooth front pulley + shorter belt ratio of 2.94 or 2.97.
Now just waiting till I have a chance to tear it down and make the swap.
1. the flange, where the 7/16" bolts go thru, is .50" thick instead of .90" so shorter bolts are required, or cut down the stock ones.
2. the obvious, 68 teeth instead of 66 teeth.
So the Andrews 30 tooth front pulley and 07 Sportster 68 rear pulley = 98 teeth and the stock belt works, with about a 1/16" difference in center distance. The final drive ratio = 3.07.
This ratio is higher then the EVO Industries 30 tooth primary motor sprocket ratio of 3.15 and lower than the Evo Industires 49 tooth primary clutch sprocket or Andrews 30 tooth front pulley + shorter belt ratio of 2.94 or 2.97.
Now just waiting till I have a chance to tear it down and make the swap.