EVO: Transmission & Final Drive


Primary/Transmission/Final Gear Ratios

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883 Belt Model Trans Sprocket Part Numbers

1991-92 883 Deluxe
1993-94E 883 All

Part Oil Seal Spacer Trans Sprocket Belt Sprkt Kit w/mtg parts
Part # 12050 33334-85 0.849“ Thick Only-In-Kit» 40022-91 128T 1-1/8” 40285-91A 27T
As a set, the seal, spacer & sprocket from 1995 can be retrofitted back to the 1991-94 models.

1994L-2003 883 All

Part Oil Seal Spacer Trans Sprocket Belt Sprkt Kit w/mtg parts
Part # 12067A 33344-94 0.600“ Thick 40288-95 27T 40022-91 128T 1-1/8” 40285-91B 27T

2004-06 883 All

Part Oil Seal Spacer Trans Sprocket Belt
Part # 12067B 33344-94 0.600“ Thick 40379-04 28T 40570-04B 136T 1-1/8”

2007-2010 - 883

Part Oil Seal Spacer Trans Sprocket Belt
Part # 12074 Built into Bearing 40379-04 28T 40371-07 136T 1“

2011+ - 883

Part Oil Seal Spacer Trans Sprocket Belt
Part # 12074 Built into Bearing 40409-04 29T 40591-07 137T 1”

1200 Belt Model Trans Sprocket Part Numbers

1991-94E - 1200

Part Oil Seal Spacer Trans Sprocket Belt Sprkt Kit w/mtg parts
Part # 12050 33334-85 0.849“ Thick Only-In-Kit» 40022-91 128T 1-1/8” 40202-91A 29T
As a set, the seal, spacer & sprocket from 1995 can be retrofitted back to the 1991-94 models.

1994L-03 - 1200

Part Oil Seal Spacer Trans Sprocket Belt Sprkt Kit w/mtg parts
Part # 12067A 33344-94 0.600“ Thick 40205-95 29T 40022-91 128T 1-1/8” 40202-91B 29T

2004-06 - 1200

Part Oil Seal Spacer Trans Sprocket Belt
Part # 12067B 33344-94 0.600“ Thick 40409-04 29T 40571-04B 137T 1-1/8”

2007+ - 1200

Part Oil Seal Spacer Trans Sprocket Belt
Part # 12074 Built into Bearing 40409-04 29T 40591-07 137T 1“


Rear Belt Driven Sprocket Part Numbers

Rear Belt Driven Sprocket Rear Sprocket Bolts/Washers
Year Part No Part Description Year Part No Description
1991-1999 40213-91 61T BLACK 1992-1999 3730A
6516HW
BOLT (5)
WASHER (5)
40227-93 61T SILVER
2000-2003 40213-00 61T BLACK 2000-2022 3899
6516HW
BOLT (5)
WASHER (5)
40227-00 61T SILVER
See the note below about casting# 40246-91
2004-2006 40350-04 68T BLACK
40352-04 68T SILVER
2007-2015 40350-07 68T BLACK w/highlights
40444-07 68T BLACK (Nightster / 883 Iron)
40353-08 68T BLACK (883 Iron / 48)
2016-2022 40350-07 68T BLACK w/highlights
40444-07 68T BLACK (Nightster)
42200121 68T BLACK (48)

NOTE: 40246-91 is a casting number - These casting numbers are on both early, 1991-1999, and late, 2000-2003, Sportster 61 tooth x 1-1/8” pulleys. The offset is the same for early and late but the early and late are not interchangeable; the early has a 2“ center hole, the late is 2-3/16”. There are adapters available so you can use a late (2-3/16“) on an early wheel (2”) , but the early does not fit the late. You can tell the late pulley visually by looking at the machined bosses for the mounting bolts. The late model bosses are intruded by the center hole and do not show completely round. The early pulleys either have no bosses or the bosses are completely round. The early pulleys are silver, the late are silver or black, from the factory.1)


Final Drive Trans Belt Sprocket Issues (Differences between 1991, 1995 & 2004)

Remember, the Final Drive Trans Belt Sprocket has left-hand threads! Use a locking tool when removing or installing the sprocket.

The Final Drive Trans Belt Sprocket (from the transmission) must align with the Rear Wheel Sprocket, which is determined by the wheel width. The Trans Drive Sprocket has a belt guide flange on one side only.

For 1991-2003 the sprocket flange is away from the engine. But, there
are spline differences between 1991-1994 and 1995-2003.
For 2004-later the sprocket flange is near the engine.
2)

Pre-2004, on the outer flanged side, the center mounting splines are relatively flush with the flange face. But, on the engine side of the sprocket, the center mounting splines are recessed from the edge of the belt drive face. On 2004-later, the flange is on the engine side (with recessed splines there) and the mounting nut and lock plate are on the outer, flangeless, side.

On 1991-94 Sportsters, the flanged side of the sprocket is away from the engine. On the opposite side, between the case bearing seal (for the transmission Final Drive Shaft) and the recessed splines on the Trans Drive Sprocket, is a spacer to fit in that recess. The width of the splines in contact with the Final Drive Shaft is 0.500“.

On the 1995-03 models, the center spline contact area of the Trans Drive Sprocket (on the Trans Drive Shaft) was widened to 0.766” and the recess spacer was reduced accordingly. The flanged side of the sprocket is still away from the engine. (As a set, the seal, spacer & sprocket from 1995 can be retrofitted back to the 1991-94 models.)

Note: To fit a 1995-03 pulley to a 1991-1994 model requires the matching seal. The '95+ spacer has a larger outside diameter than the 1991-94. Also note, that 1994 was a transition year to the later style pulley; “early” '94s had “early” pulley setups, “late” '94s had '95+ pulley setups.

On the 2004-later models, the Trans Drive Sprocket design was reversed. The flanged side was placed toward the engine, thereby pushing the usable belt surface farther away from the engine to allow for a wider rear tire (150mm). On the flanged side, the center mounting splines are recessed .400“ from the flange face.

For 2004-2005, the older spacer (as used on '95-'03) was still used between the case bearing seal and the sprocket.

On the 2006+ models, the spacer was incorporated into the transmission output shaft bearing.

Year Description & P/N Note
1991-E94 Oil Seal 12050 Spacer for Sprocket with
0.500 width splines
Spacer 33334-85
L94-1995-2005 Oil Seal 12067B Spacer for Sprocket with
0.766 width splines
Spacer 33344-94
2006-later Oil Seal 12074 Spacer is part of
shaft bearing
Spacer 8964

Note: The early trans pulleys will not mount to the '04-up's (even with the flange turned inboard) because:

  • 1) the “extra” 1/4” for the inner spline is only a “bump”, there is no area for the nut and lockplate on the early versions.
  • 2) The splines need to be recessed .400“ from the (now inboard) belt flange - they are not recessed on the early versions.
  • 3) With the flange outboard, the early version Final Trans Drive Sprocket cannot be properly aligned with the 2004+ Rear Wheel Sprocket. If the belt rides against the flange, overheating may occur and the flange (press fitted) can separate from the sprocket.

This XLForum Thread was used for collecting the above information. Thanks to those who contributed, especially Sirrom1.


Belt Sizes & Part Numbers

Year PartNo Models Description
Chains — 530 Final Drive Chain - 530 means Pitch = 5x 1/8” & Width = 3x 1/8“
1986-87 883/1100 106 Links
1988-90 883/1200 108 Links - 1/2” longer Swingarm
1991-92 883 Std/Hug 108 Links - 1/2“ longer Swingarm
40028-15E 883/1100/1200 Duckworth Brand 530 Chain
Chain is 110 Links Long - Needs shortened to 106 or 108 Links
40053-65 Duckworth Connecting Link
40029-15E 883/1100/1200 Diamond Brand 530 Chain
Chain is 110 Links Long - Needs shortened to 106 or 108 Links
40052-65 Diamond Connecting Link
Year PartNo Models Description
1-1/8” Belt Width
1991-92 40022-91 883Dlx/1200 128 Tooth
1993-2003 40022-91 883/1200 128 Tooth
2004-2006 40570-04 883 136 Tooth
40571-04B 1200 137 Tooth
1“ Belt Width
2007-2010 40371-07 883 136 Tooth
40591-07 1200 137 Tooth
2011-2022 40591-07 883/1200 137 Tooth


Belt Twist for Carrying Spare Belt

According to Sportsterpaul (of the XLForum) it is worth carrying a spare
belt for any long trip. When you replace a high mileage belt, save the
old one for a spare.3) Make a note of the rotation direction.

Then, carefully, do a double twist of the belt to stack it three layers high.
It keeps a nice big radius (not damaging the belt) and packs well.

If your present belt should break, having a spare belt with you
can work for a roadside repair, without fully removing your tire.


The suggested way to replace the belt4) is to remove the lower bolt from
the shock and swing it out of the way. Loosen the axle nut and the axle
adjusters so the tire can move forward.

Slip the belt up and over the belt guard, over the front sprocket, then onto
the rear sprocket from behind.

Push the tire back and readjust the adjusters & tighten the axle.
Then align the shock and replace the lower bolt.
You could also shortcut the procedure (if you dare to do so carefully). Don't loosen the axle or adjusters. Just remove the lower bolt from the shock
& swing it out of the way. Slip the belt up and over the belt guard, allowing it to be low behind the rear sprocket (not on it). Then slip the belt over
the front sprocket & start it (as far as possible) over the rear sprocket rim at the bottom. Pull it up snug to stay in place. Then roll the bike forward
so the belt pulls up around the rear sprocket and 'slips' into place. Replace the shock & bolt. The old belt will likely be a little loose from wear
and will 'slip on' in this way as a 'temporary' fix until you can replace it with a new belt. Or, do it the longer way if you have any concerns.


Aftermarket Options

Various aftermarket options are listed in the REFerence Section: HERE


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