	The first 45 sportster was supplied with the needle on the carburetor and then changed to a remote needle. Threads are 6-40. The .45 had 14 head fins and diameter of 1.770" Early models had deep fins on the head but it proved to be too much cooling so the fins were machined down.
Part No. 5900

New Part No.	Old Part No.	Description
10-5901	5901	Crankcase
11-5901	5905	Head
15-5901	-	Wrist pin w/teflon pads
16-5901	-	Connecting Rod
17-5901	5951	Crankshaft
20-5901	-	Prop Driver May be same as 20-5601
21-5901	-	Back Plate
21-5902	-	Radial Mount
24-4090	7832	Prop Stud, Nut & Washer
25-5831	-	Muffler Screws (2 screws)
25-5901	-	Engine screw set ( contains 4 -head screws 6-40 thread & 4 back cover screws)
26-5901	-	Teflon pads for wrist pin (2 pads)
27-5880	-	Mixture disk O-ring set
27-5911	-	O-ring head seal (early model)
27-5981	-	Carburetor neck O-ring
28-5901	5945	Draw Bar
29-5911	5939	Head Gasket
29-5921	-	Back Cover Gasket
30-5901	-	Muffler complete with adapter & screws
30-5990	5910	Muffler Assembly w/ 2 Screws
30-5991	5919	Muffler Adaptor
30-5992	5908	Muffler Caps and Stud Kit
30-5993	-	Muffler Baffle Tubes Assembly
33-5901	5902	Cylinder and Piston
80-5901	5950	Carb Complete, early model w/main needle attached use 80-5902 & 99-9255
80-5902	5965	K&B Carburetor for remote needle
81-5901	5948	Carburetor Body and Barrel (early style)
83-5622	5622	Carburetor control arm
-84-5946	5946	Low speed eccentric and spring early model
-	8679	Fuel nipple
85-5901	-	Mixture disk with O-ring set (early style)
85-5902	-	Mixture disk with O-ring set
87-5665	5665	Needle Valve Assembly on carburetor type
9255	9255	Remote Needle Valve Assembly

No part may be reproduced without written permission from
MECOA/K&B -- P.O. Box 98 -- Sierra Madre, CA 91025 U.S.A.