Part numbers for 07 sprockets?

[Gary7]

I'm thinking about changing out my 28T front sprocket for either a 29T or the 30T that comes on export XLs. I know the 07 has unique sprockets because of the new narrower belt, so does anyone have the HD part numbers for the 29T and 30T sprockets? Thanks.

[Screw Loose Dan]

My parts manual lists the following:

40379-04 - 28T
40409-04 - 29T
40380-04 - 30T

I've been looking at this myself. How are you going to change the speedometer to read correctly? Or are you not going to worry about it?

[Gary7]

Originally Posted by drcstang

My parts manual lists the following:

40379-04 - 28T
40409-04 - 29T
40380-04 - 30T

I've been looking at this myself. How are you going to change the speedometer to read correctly? Or are you not going to worry about it?

I hadn't planned to worry about the speedo unless it turns out to be WAY off.

Those part numbers bother me. The -04 would indicate they are for 04 to 06 bikes. I'm pretty sure I read that the 07 carbon fiber belts are narrower, so would this not necessitate a different sprocket?

[Screw Loose Dan]

Originally Posted by Gary7

Those part numbers bother me. The -04 would indicate they are for 04 to 06 bikes. I'm pretty sure I read that the 07 carbon fiber belts are narrower, so would this not necessitate a different sprocket?

Well, the numbers are right out of my 2007 HD parts Catalog (part number 99451-07).

I can't answer about the belt being narrower. I know the belt is different, but I didn't realize narrower. I just thought it was made of different material (but I could be totally wrong). The parts catalog does list the belts as:

40371-07 136T (883's)
40591-07 137T (1200's)

[d_dieffenbach]

Gary i dont believe the belts on the 07,s are any different than the 04 to 06. i am not sure why they would put a narrower belt on the 07,s the tire size is still the same on 04 and newer sportsters.

[Gary7]

I could have sworn I read somewhere on the HD web site that the new carbon fiber belts for the XL were narrower.

Oh well...

[d_dieffenbach]

gary just curious how wide is your belt on your 07. my belt on my 04 is 1 1/8inches wide.gary they may have change the belt to a newer better belt. who knows.

[snowman]

Originally Posted by d_dieffenbach

gary just curious how wide is your belt on your 07. my belt on my 04 is 1 1/4inches wide.gary they may have change the belt to a newer better belt. who knows.

04-06 belts should be 1 1/8". 2007 softails went to a 20mm (3/4") wide belt. All are 14mm pitch on the teeth spacing.....

[cadiero]

The '07 Sportster belt is narrower. It is a better belt, all HD's went to a narrower belt in '07.

But, why does the sprocket need to be narrower? Can't a narrower belt run on a wider sprocket? Well it can, the sprockets didn't change, those are the right part #'s.

BTW, when Big Twin's went from a 1 1/2" belt to a 1 1/8" belt the front sprocket remained unchanged still to this day.

[prplhays]

One other thing to consider is if you jump from a 28T to a 30T you may need a new belt because the old belt may not be long enough. I went from a 28T to a 29T and I had ample belt length, but I've seen on this forum that jumping up two sizes could necessitate a belt change.