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1st Gear
Joined: Jul 2010
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From: i live In St. Marys ohio
Hello
Whats up people i am new to this forum.I am Building a 71 XLH Basket case,I am trying to figure out if my bike is a 1000cc,or a 900cc I think it is a 1000cc based off the serial number on the block it starts with 3A. But i am not sure what to look at to tell. Any help would be nice thnx.
Cruiser
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From: New Zealand, South Island
Welcome & good luck
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From: San Diego/Tj mexico
Welcome to the forum. Have fun here,Ride safe
try this
Ever wonder when your engine was built? Not just the model year but its actual birthday? Well here's how to figure it out...
First, locate the crankcase number (not the same as the VIN). On a Big Twin the number is located on the left engine case in front of and slightly below the nose of the primary case. On a Sporty, the numbers tended to move a little from year to year, but most are stamped on the right crankcae just in front of the oil pump.
Its a 10 digit series and will begin with a 15 on 49 state Big Twins and a 20 on California Big Twins. On Sportsters, the numbers are a bit more involved. A 24 is an 883, 25 is a 1200, 26 is a California 883, 27 is a California 1200, 29 is a Swiss 883, 30 is a Swiss 1200, 31 an International 883, and a 32 is an International 1200. Phew!!
The next 2 numbers are the model year.
The next 3 numbers are the day the engine was built, but they require a little decoding, a calculator and maybe even a calendar for it to be something understandable. For example say you've got a '97 model and the 3 numbers are 090. Get this your engine was built on March 31!! Here's how you get there...The month of January had 31 days, February had 28 (if it were a leap year it would've had 29) and March had 31 as well. If you add the days up for those 3 months they total 90. This means the engine was built on March 31!! If the number was 115, your engine was born on April 25, etc. etc. Pretty cool huh?
Now for the last three numbers. These numbers will tell you what number in the production line your engine was in. For example, if the last 3 numbers on your engine were 015...your engine was the 15th engine built that day.
Anyway that's how you break down the engine numbers.
Crankcase Identification Numbers
Numbers located on both left and right crankcase halves.
Big Twin: Left Case - Outside, Lower Front
Right Case - Inside, Gearcase Compartment
XL Models: Left Case - Inside, Primary Compartment
Right Case - Outside, Near Oil Pump
Stamped at Capitol Drive Facility
Used to identify engine and track production changes
Example: 1588 321 007
15 = Engine Designation
1 = 1200cc Shovelhead
7 = 1000cc Iron XL
14 = 1340cc Shovelhead
15 = 1340cc Evolution
16 = XR-1000
17 = 883cc Evolution XL
18 = 1100cc Evolution XL
19 = 1200cc Evolution XL
20 = 1340cc Evolution, California (1988 - *)
21 = 883cc Evolution XL, California (1988 - *)
22 = 1200cc Evolution XL, California (1988 - *)
88 = Model Year
321 = Day of Production
001 = Jan. 1st 182 = Jul. 1st
032 = Feb. 1st 213 = Aug. 1st
060 = Mar. 1st 244 = Sep. 1st
091 = Apr. 1st 274 = Oct. 1st
121 = May 1st 305 = Nov. 1st
152 = Jun. 1st 335 = Dec. 1st
007 = Number That Day
try this
Ever wonder when your engine was built? Not just the model year but its actual birthday? Well here's how to figure it out...
First, locate the crankcase number (not the same as the VIN). On a Big Twin the number is located on the left engine case in front of and slightly below the nose of the primary case. On a Sporty, the numbers tended to move a little from year to year, but most are stamped on the right crankcae just in front of the oil pump.
Its a 10 digit series and will begin with a 15 on 49 state Big Twins and a 20 on California Big Twins. On Sportsters, the numbers are a bit more involved. A 24 is an 883, 25 is a 1200, 26 is a California 883, 27 is a California 1200, 29 is a Swiss 883, 30 is a Swiss 1200, 31 an International 883, and a 32 is an International 1200. Phew!!
The next 2 numbers are the model year.
The next 3 numbers are the day the engine was built, but they require a little decoding, a calculator and maybe even a calendar for it to be something understandable. For example say you've got a '97 model and the 3 numbers are 090. Get this your engine was built on March 31!! Here's how you get there...The month of January had 31 days, February had 28 (if it were a leap year it would've had 29) and March had 31 as well. If you add the days up for those 3 months they total 90. This means the engine was built on March 31!! If the number was 115, your engine was born on April 25, etc. etc. Pretty cool huh?
Now for the last three numbers. These numbers will tell you what number in the production line your engine was in. For example, if the last 3 numbers on your engine were 015...your engine was the 15th engine built that day.
Anyway that's how you break down the engine numbers.
Crankcase Identification Numbers
Numbers located on both left and right crankcase halves.
Big Twin: Left Case - Outside, Lower Front
Right Case - Inside, Gearcase Compartment
XL Models: Left Case - Inside, Primary Compartment
Right Case - Outside, Near Oil Pump
Stamped at Capitol Drive Facility
Used to identify engine and track production changes
Example: 1588 321 007
15 = Engine Designation
1 = 1200cc Shovelhead
7 = 1000cc Iron XL
14 = 1340cc Shovelhead
15 = 1340cc Evolution
16 = XR-1000
17 = 883cc Evolution XL
18 = 1100cc Evolution XL
19 = 1200cc Evolution XL
20 = 1340cc Evolution, California (1988 - *)
21 = 883cc Evolution XL, California (1988 - *)
22 = 1200cc Evolution XL, California (1988 - *)
88 = Model Year
321 = Day of Production
001 = Jan. 1st 182 = Jul. 1st
032 = Feb. 1st 213 = Aug. 1st
060 = Mar. 1st 244 = Sep. 1st
091 = Apr. 1st 274 = Oct. 1st
121 = May 1st 305 = Nov. 1st
152 = Jun. 1st 335 = Dec. 1st
007 = Number That Day