Just picked up a 22 JA engine. Tried searching and they made a JA engine and not lots of info out there. Is this a cop motor? Fast motor? 61 or 74 CI? there is a casting stamp on primary side 2-18 on it and a circle with what looks like wef cast into it. Does this make it an early or late motor... Any help???
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From http://www.techsweb.us/hdvin2029.html
Model 20JA - "A" motor F-head V-twin, 3 speed, electrical system
A group that specializes in these 1916 thru 1929 cycles: https://groups.yahoo.com/neo/groups/harleyjd/infoBill Gilbert in Oregon -
Techwebus doesnt say if it is a 61 or 74. any help?Comment
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If you have cylinders with the motor; count the number of horizontal fins by the spark plug, and down to the exhaust spigot. A 61" will have 5 fins, and a 74" will have 7 fins.Eric Smith
AMCA #886Comment
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74" was introduced in 1921 so my money is that a 1920 is a 61"
MarkMark Masa
www.linkcycles.comComment
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I thought he said it was a '22.Eric Smith
AMCA #886Comment
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If it left the factory as a 74 it would be stamped JDA surely.
It still could have been converted at a later date and then you do as Eric says and count the fins to decidePeter Thomson, a.k.a. Tommo
A.M.C.A. # 2777
Palmerston North, New Zealand.Comment
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Sorry. My bad. I looked up and saw 23JDCA 808's post and saw "20JA"Originally posted by exeric View Post
I agree with Tommo. The VIN would have a D in it if it was a 74".
The base flange stud spacing will tell too. All 1921-23 61" cylinders were small base.
MarkMark Masa
www.linkcycles.comComment
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