IH: Engine Mechanicals - Sub-01F

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====== IH: Engine Mechanicals - Sub-01F ======
====== Ironhead Transmission Sprocket Cover Pics ======
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====== Sprocket Cover Part Numbers ======
All part numbers were gathered from period specific Sportster parts catalogs from 1957-1985 including supplement and updated catalogs. \\

^{{techtalk:miscres:instruction_sheet_header_4.png?nolink&820|}}|||||
|Year \\ Model|Part \\ Number|For \\ Kickstart?|Casting \\ Number|Notes|
|1952-E1954 K Models|34876-52 ((1953 K Model Spare Parts Catalog))|Yes|34874-52|  |
|  Additional notes|It is believed the MoCo made a running change in mid 1954 when they changed worm gears. ((Harley K Model site)) \\ The sprocket covers were sold as "complete". \\ So the new worm gear should have been installed in a new cover part#.||||
|L1954-1956 K Models|34876-52A ((1954 K Model Spare Parts Catalog)) ((1957 HD Sportster and K Model Parts Catalog))|Yes|34874-52|Replaced by 34876-52B (1957) \\ Replaced by 34876-57 (1958) \\ Used 34876-52A (1959-on)|
|1957 XL|34876-52B ((1958 HD Sportster and K Model Parts Catalog Supplement))|Yes|  |Replaced by 34876-57 (1958) \\ Replaced by 34872-57A (1970) ((1970 HD Sportster and K Model Parts Catalog))|
|  Additional notes|See Pic section below.||||
|1958-1962 XL/XLH/XLC/XLCH|34876-57 ((1958-1963 HD Sportster and K Model Parts Catalogs and Supplements))|Yes|34874-52A|Replaced by 34872-57 (1963) \\ Replaced by 34872-57A (1970) ((1970 HD Sportster and K Model Parts Catalog))|
|1963-1966 XLH/XLCH \\ and 1967 XLCH|34872-57 ((1967 HD Sportster and K Model Parts Catalog)) \\ 34872-57A|Yes|34874-52A \\ 74-52|Replaced by 34872-57A \\ For 1967 XLCH only (1968) ((1968 HD Sportster and K Model Parts Catalog Supplement)) \\ For all models (1970)|
|1967 XLH|34871-67 ((1967 HD Sportster and K Model Parts Catalog))|Yes|79-67|Replaced by 34871-67A (1969) \\ Replaced by 34871-67B (1970)|
|1967-1970 XLH|34871-67B ((1971 HD Sportster and K Model Parts Catalog))|Yes|79-67B|Offered in 1971| 
|1968-1969 XLH|34869-68 ((1968 HD Sportster and K Model Parts Catalog Supplement))|No|79-67A|  |
|1968-1969 XLCH|34872-57A ((1968 HD Sportster and K Model Parts Catalog Supplement))|Yes|74-52|  |
|1970 XLH|34869-70 ((1970 HD Sportster and K Model Parts Catalog))|No|79-67B|  |
|1970 XLCH|34872-70 ((1970 HD Sportster and K Model Parts Catalog))|Yes|  |  
|1971-1972 XLH|34870-71 ((1971 HD Sportster and K Model Parts Catalog))|No|34879-71|Polished.|
|1971-1972 XLH|34871-71 ((1971 HD Sportster and K Model Parts Catalog))|Yes|34879-71|Polished|
|1971-1972 XLCH|34872-71 ((1971 HD Sportster and K Model Parts Catalog))|Yes|34879-71|Polished. \\ Replaced by 34872-71 (1975)|
|1973 XLH|34870-73 ((1973 HD Sportster Parts Catalog Supplement))|No|34879-71|Black. \\ Kick cover 34871-71 (offered 1976)|
|1973 XLCH|34872-73 ((1973 HD Sportster Parts Catalog Supplement))|Yes|  |Black|
|1974 XLH|34870-71 ((1975 HD Sportster Parts Catalog Supplement))|No|34879-71|Polished. \\ Kick cover 34871-71 (offered 1976)|
|1974 XLCH|34872-71 ((1975 HD Sportster Parts Catalog Supplement))|Yes|  |Polished|
|1975-1976 XLH|34868-75 ((1975 HD Sportster Parts Catalog Supplement))|No|34879-71|Kick cover 34871-71 (offered 1976)|
|1975-1976 XLCH|34896-75 ((1975 HD Sportster Parts Catalog Supplement))|Yes|34879-71|
|1977-1978 XL/XLH|34870-75 \\ \\ 34870-75A|No|34879-75 or \\ 34876-75 \\ 34876-75A|Outer cover \\ \\ Replaced by 34870-75A (-78A cat)|
|1977-1978 XLCH|34872-75|Yes|34879-75|Outer cover|
|1977-1978 XL/XLCH|34893-75|N/A|  |Inner cover|
|1979 XLH|34863-79 ((1979 HD Sportster Parts Catalog))|No|34879-79A|Outer cover|
|E1979 XLCH|34872-79 ((1979 HD Sportster Parts Catalog))|Yes|34879-79A|Polished outer cover|
|1979 XLS|34870-79 ((1980 HD Sportster Parts Catalog))|No|34879-79A|Outer cover|
|1979 XLH/XLCH/XLS|34899-79 ((1979 HD Sportster Parts Catalog))|No|None|Inner cover|
|1980 XLH|34911-80 ((1980 HD Sportster Parts Catalog))|No|  |Polished  cover. \\ Replaced by 34918-81 (1983)|
|1980 XLS|34912-80 ((1980 HD Sportster Parts Catalog))|No|  |Black cover. \\ Replaced by 34915-81 (1982) \\ Replaced by 34915-81A (1984)|
|E1981-1982 XL|34918-81 ((1981 HD Sportster Parts Catalog))|No|  |Polished cover. \\ Replaced by 34918-81A (1984)|
|L1981-1985 XL|34911-81 ((1981, 1982, 1983, 1984, 1985 HD Sportster Parts Catalogs))|No|  |Polished cover. \\ Replaced by 34918-81A (1985)|
|E1981 XLS|34915-81 ((1981, 1985 HD Sportster Parts Catalogs))|No|  |Vivid black cover. \\ Replaced by 34915-81A (1985)|
|L1981-1982 XLS|34912-81 ((1981, 1982 HD Sportster Parts Catalogs))|No|  |Black cover|
|1983-1984 XLS|34911-81 ((1983,1984 Sportster Parts Catalogs))|No|  |Polished cover|
|1983-E1984 XLX|34908-83 ((1984, 1985 Sportster Parts Catalogs))|No|  |Aluminum finish cover|
|L1984-1985 XLX|34908-83A ((1985 Sportster Parts Catalog))|No|  |Painted cover|
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====== Part #s VS Casting #s ======
The part number for these sprocket covers DOES NOT APPEAR on the cover. \\
The casting number is visible on the inside of the covers as well as described in the chart above and the pics below. \\
The casting number is the same for many covers as that is the base construction of many of them (even though there are still differences between them). \\
See also [[techtalk:miscres:miscres50|HD Part Numbers Explained]] and [[techtalk:miscres:miscres51|HD Casting Numbers, Letters and Symbols Explained]] in the Sportsterpedia. \\

Every Ironhead sprocket cover has a casting number, else it's not a factory part. \\
Likewise, aftermarket covers do not have HD casting numbers. \\
====== Worm Gear Stop Pin (1970-Earlier Models) ======
The stop pin (roll pin) is in the cover (underside). Look closely at these as they have a tendency to shear off flush with the cover. \\
The early covers were drilled through at the roll pin and you could drive it out from the outside. ((brucstoudt of the XLFORUM http://xlforum.net/forums/showthread.php?t=2061986)) \\
1968-1970 covers have a boss added to the underside in a wider girth around the worm gear. \\
The hole for the roll pin is drilled from the underside, through the boss, but not all the way through to the outside of the cover. \\
This makes removing the roll pin harder. \\
====== 1952-1970 Transmission Sprocket Covers ======

===== 1957 XL Cover =====
**Cover part# change between 1957 and 1958**: \\
Cover (34876-52B) shows up for the first time in the -57 parts catalog for 1957 XLs and replacement for all 1952-1956 K Models. \\
However, the -58 parts supplement catalog labels the -52B cover as "not used, Replaced by 34876-57". \\
And the -58 catalog also shows the 34876-52A cover as replacement for K Models, not the -52B cover. \\

===== 1957-1962 XL/XLH/XLC/XLCH Cover =====
Sprocket Cover part# (34876-57), with kickstarter. The casting number is (34874-52A). \\
**Features and changes**: \\
The angle of the worm gear grease (zerk) fitting changed to (angled forward 1:00) as opposed to the vertical position on the K Model covers. \\
The grease fitting is threaded into the boss. \\
Also the grease (zerk) fitting position for the kick starter crankshaft was moved to the (9:00) position. \\
A boss is cast into the cover at the (9:00) position as extra strength for the grease fitting which is pressed in. \\
The pin stop for the worm gear is simply pressed into a hole drilled through the cover at an angle. \\
The center cavity under the bar on the cam cover side resembles the back side of an arrow. \\

Pics of used covers. Click on any pic to enlarge: \\
{{:techtalk:ih:engmech:1957-1962_xl-xlh-xlc-xlch_sprocket_cover_34876-57_pic1_by_mrmopar6499.jpg?direct&300|}} ((photo courtesy of Brewer's Performance Inc. in Laura, Ohio [[http://www.brewersperformance.com/|Link to website]] )) {{:techtalk:ih:engmech:1957-1962_xl-xlh-xlc-xlch_sprocket_cover_34876-57_pic2_by_mrmopar6499.jpg?direct&300|}} ((photo courtesy of Brewer's Performance Inc. in Laura, Ohio [[http://www.brewersperformance.com/|Link to website]] )) \\

{{:techtalk:ih:engmech:1957-1962_xl-xlh-xlc-xlch_sprocket_cover_34876-57_pic3_by_mrmopar6499.jpg?direct&300|}} ((photo courtesy of Brewer's Performance Inc. in Laura, Ohio [[http://www.brewersperformance.com/|Link to website]] )) {{:techtalk:ih:engmech:1957-1962_xl-xlh-xlc-xlch_sprocket_cover_34876-57_pic1_by_cyclewarehouse.jpg?direct&300|}} ((photo courtesy of Ebay seller, cyclewarehouse. [[https://www.ebay.com/sch/cyclewarehouse/m.html?_nkw=&_armrs=1&_ipg=&_from=|Link to Items for Sale]] )) \\

===== 1963-1966 XLH/XLCH, 1967 XLCH =====
Sprocket Cover part# (34872-57), with kickstarter. The casting number is (34874-52A). \\
**Features and changes**: \\
The grease (zerk) fitting position for the kick starter crankshaft was moved to the forward side of the bushing hole (1:00). \\
A long angled boss was added off the crankshaft bushing bore for the new grease fitting location. \\
The 1962-previous boss is still present at the (9:00) position but it is not drilled out for a fitting. \\
The pin stop for the worm gear is pressed into a hole drilled through the cover at an angle. \\
The center cavity under the bar on the cam cover side resembles the back side of an arrow. \\

{{:techtalk:ih:engmech:1963-1966_xlh-xlch_1967_xlch_transmission_sprocket_cover_pic1_by_mrmopar6499.jpg?direct&300|}} ((photo courtesy of Ebay seller,  mrmopar6499 [[https://www.ebay.com/sch/i.html?item=295998173581&rt=nc&_trksid=p4429486.m3561.l2562&_ssn=mrmopar6499|Link to Ebay Store]] )) {{:techtalk:ih:engmech:1963-1966_xlh-xlch_1967_xlch_transmission_sprocket_cover_pic2_by_mrmopar6499.jpg?direct&300|}} ((photo courtesy of Ebay seller,  mrmopar6499 [[https://www.ebay.com/sch/i.html?item=295998173581&rt=nc&_trksid=p4429486.m3561.l2562&_ssn=mrmopar6499|Link to Ebay Store]] )) {{:techtalk:ih:engmech:1963-1966_xlh-xlch_1967_xlch_transmission_sprocket_cover_pic3_by_mrmopar6499.jpg?direct&300|}} ((photo courtesy of Ebay seller,  mrmopar6499 [[https://www.ebay.com/sch/i.html?item=295998173581&rt=nc&_trksid=p4429486.m3561.l2562&_ssn=mrmopar6499|Link to Ebay Store]] )) \\

===== 1967 XLH Cover =====
The 1967 XLH cover continues the ribbed design, but has a cutaway for the electric start (one year only). ((Moon Wolf of the XLFORUM http://xlforum.net/forums/showpost.php?p=3158885&postcount=3)) \\
Sprocket cover part# (34871-67), with kickstarter, the casting number is (79-67).

===== 1968-1969 XLH Cover =====
The original 1968-1969 XLH cover is HD part# (34869-68), without kick starter. The casting number is (79-67A). \\
The ribbed design matching the cam cover was removed for a smooth surface across the cover instead. \\
The worm gear roll pin bore does not go all the way through the cover. \\
 
===== 1970 XLH Cover =====
Sprocket Cover (34869-70), without kick starter. \\
Click on a pic to enlarge \\

{{:techtalk:ih:engmech:1970_xlh_sprocket_cover_34869-70_pic1_by_ebay_deadpartsmc.jpg?direct&300|}} ((photo courtesy of DeadpartsMC, [[https://www.ebay.com/str/deadpartsmc|Link to Ebay Store]] )) {{:techtalk:ih:engmech:1970_xlh_sprocket_cover_34869-70_pic2_by_ebay_deadpartsmc.jpg?direct&300|}} ((photo courtesy of DeadpartsMC, [[https://www.ebay.com/str/deadpartsmc|Link to Ebay Store]] )) \\

Additional pics \\

{{:techtalk:ih:engmech:1970_xlh_sprocket_cover_34869-70_by_shopanuck_s_pic1.jpg?direct&300|}} ((photo courtesy of Ebay seller, shopanuck's [[https://www.ebay.com/str/shopanucks?_trksid=p4429486.m145687.l149086|Link to Ebay Store]] )) {{:techtalk:ih:engmech:1970_xlh_sprocket_cover_34869-70_by_shopanuck_s_pic2.jpg?direct&300|}} ((photo courtesy of Ebay seller, shopanuck's [[https://www.ebay.com/str/shopanucks?_trksid=p4429486.m145687.l149086|Link to Ebay Store]] )) \\

===== 1967-1970 XLH (replacement) Cover =====
Sprocket Cover (34871-67B), with kickstarter. This cover was sold in 1971 as a replacement for 1967-1970 XLH models. \\
Click on a pic to enlarge  ((photos courtesy of Ebay seller, Robison Motorcycles [[ https://www.ebay.com/str/robisonmotorcycles?_trksid=p2047675.l2563 |Link to Ebay Store]] ))  \\

{{:techtalk:ih:engmech:1967-1970_xlh_replacement_transmission_sprocket_cover_34871-67b_pic1_by_robison_motorcycles.jpg?direct&300|}}
{{:techtalk:ih:engmech:1967-1970_xlh_replacement_transmission_sprocket_cover_34871-67b_pic2_by_robison_motorcycles.jpg?direct&300|}}
{{:techtalk:ih:engmech:1967-1970_xlh_replacement_transmission_sprocket_cover_34871-67b_pic3_by_robison_motorcycles.jpg?direct&300|}} \\

====== 1971-1972 XLH, 1974 XLH Cover ======
Sprocket Cover (34870-71), polished, without kick starter. \\
Click on a pic to enlarge ((photos courtesy of Ebay seller, animalhouse2010, [[https://www.ebay.com/str/animalhouse2010?_trksid=p2047675.l2563|Link to Ebay store:]] )) \\

{{:techtalk:ih:engmech:1971-1972_xlh_1974_xlh_sprocket_cover_34870-71_pic1_by_animalhouse2010.jpg?direct&300|}} {{:techtalk:ih:engmech:1971-1972_xlh_1974_xlh_sprocket_cover_34870-71_pic2_by_animalhouse2010.jpg?direct&300|}} {{:techtalk:ih:engmech:1971-1972_xlh_1974_xlh_sprocket_cover_34870-71_pic3_by_animalhouse2010.jpg?direct&300|}} \\

====== 1973 XLH Cover ======
Sprocket Cover (34870-73), black, without kick starter. \\
Click on a pic to enlarge  ((photos courtesy of Ebay seller, jrsvintageharley1990. [[https://www.ebay.com/str/jrsvintageharleyparts?_trksid=p2047675.l2563|Link to Ebay Store]] )) \\

{{:techtalk:ih:engmech:1973_xlh_sprocket_cover_34870-73_pic2_by_jrsvintageharley1990.jpg?direct&300|}} {{:techtalk:ih:engmech:1973_xlh_sprocket_cover_34870-73_pic1_by_jrsvintageharley1990.jpg?direct&300|}} {{:techtalk:ih:engmech:1973_xlh_sprocket_cover_34870-73_pic3_by_jrsvintageharley1990.jpg?direct&300|}} \\

====== 1975-1976 XLH Cover ======
Sprocket Cover (34868-75), polished, without kick starter. \\
Click on a pic to enlarge: ((photos courtesy of Ebay seller, Robison Motorcycles [[https://www.ebay.com/str/robisonmotorcycles?_trksid=p2047675.l2563|Link to Ebay Store]] )) \\

{{:techtalk:ih:engmech:1975-1976_xlh_sprocket_cover_34868-75_pic1_by_robisonmotorcycles.jpg?direct&300|}} {{:techtalk:ih:engmech:1975-1976_xlh_sprocket_cover_34868-75_pic2_by_robisonmotorcycles.jpg?direct&300|}} \\

====== 1977-1978 XL/XLH Cover ======
Original Outer Sprocket Cover (34870-75) for 1977-1978 XL/XLH, polished, without kick starter. \\
Click on a pic to enlarge: ((photos courtesy of Ebay seller, member85ur [[https://www.ebay.com/usr/member85ur?_trksid=p4429486.m145687.l151931|Link to Ebay Store]] ))\\

{{:techtalk:ih:engmech:1977-1978_xl-xlh_transmission_sprocket_cover_34870-75_pic1_by_member85ur.jpg?direct&300|}} {{:techtalk:ih:engmech:1977-1978_xl-xlh_transmission_sprocket_cover_34870-75_pic2_by_member85ur.jpg?direct&300|}} \\
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Replacement Outer Sprocket Cover (34870-75A) for 1977-1978 XL-XLH, polished, without kick starter.  ((photos courtesy of Ebay seller, Robison Motorcycles [[ https://www.ebay.com/str/robisonmotorcycles?_trksid=p2047675.l2563 |Link to Ebay Store]] )) \\

{{:techtalk:ih:engmech:1977-1978_xl-xlh_transmission_sprocket_cover_34870-75a_pic1_by_robison_motorcycles.jpg?direct&300|}} {{:techtalk:ih:engmech:1977-1978_xl-xlh_transmission_sprocket_cover_34870-75a_pic2_by_robison_motorcycles.jpg?direct&300|}} \\
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====== 1979 XLH ======
Outer Sprocket Cover(34863-79), polished, without kickstarter. \\
Click on a pic to enlarge: ((photos courtesy of Frost Cycle Shack [[https://www.ebay.com/str/frostcycleshack|Link to Ebay Store]]  ))

{{:techtalk:ih:engmech:1979_xlh_transmission_sprocket_outer_cover_34863-79_pic1_by_jfrost77hd.jpg?direct&300|}} {{:techtalk:ih:engmech:1979_xlh_transmission_sprocket_outer_cover_34863-79_pic2_by_jfrost77hd.jpg?direct&300|}} \\

====== 1979 XLCH Cover ======
Outer Sprocket Cover (34872-79), polished, with kichstarter. \\
Click on a pic to enlarge: ((photos courtesy of Ebay seller, WheatStateParts. [[https://www.ebay.com/str/cos0608|Link to Ebay Store]] )) \\

{{:techtalk:ih:engmech:1979e_xlch_transmission_sprocket_cover_34872-79_pic1_by_wheatstateparts.jpg?direct&300|}} {{:techtalk:ih:engmech:1979e_xlch_transmission_sprocket_cover_34872-79_pic2_by_wheatstateparts.jpg?direct&300|}} \\
====== 1979 XLS Cover ======
Original Outer Sprocket Cover(34870-79), factory painted silver, without kickstarter. \\
Click on a pic to enlarge: ((photos courtesy of Frost Cycle Shack [[https://www.ebay.com/str/frostcycleshack|Link to Ebay Store]]  ))

{{:techtalk:ih:engmech:1979_xls_transmission_sprocket_outer_cover_34870-79_pic1_by_jfrost77hd.jpg?direct&300|}} {{:techtalk:ih:engmech:1979_xls_transmission_sprocket_outer_cover_34870-79_pic2_by_jfrost77hd.jpg?direct&300|}} \\

====== 1979 XLH-XLCH-XLS Inner Sprocket Cover ======
An Inner Sprocket Cover (34899-79) was used for all 1979 model Sportsters.
The pic below is of a used inner cover. ((Left/Center photos courtesy of Ebay seller, oldiron_10 [[https://www.ebay.com/sch/i.html?item=403952880197&rt=nc&_trksid=p2047675.m3561.l2562&_ssn=oldiron_10|Link to Items For Sale page]] ))  ((right photo courtesy of Ebay seller, hawghd1 [[https://www.ebay.com/str/moschopshop?_trksid=p2047675.l2563|Link to Ebay Store]] )) \\

{{:techtalk:ih:engmech:1979_xlh-xlch-xls_inner_transmission_sprocket_cover_34899-79_pic1_by_oldiron_10.jpg?direct&300|}} {{:techtalk:ih:engmech:1979_xlh-xlch-xls_inner_transmission_sprocket_cover_34899-79_pic2_by_oldiron_10.jpg?direct&300|}} {{:techtalk:ih:engmech:1979_xlh-xlch-xls_inner_transmission_sprocket_cover_34899-79_by_hawghd1.jpg?direct&300|}} \\



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