Mount A Twin Cam On An Evo Hard Tail

Most Harleys have movable rear wheels with shock absorbers. Hardtails do not.

Before you mount a Twin Cam engine on an Evoluation (Evo) hard tail, you must take into consideration the two types of Twin Cam engines. The Twin Cam 88B is balanced, and although it is theoretically possible to modify an Evo frame to accommodate a Twin Cam 88B, it is probably not worth the trouble. The Twin Cam 88A is not balanced and it is possible to mount this engine in an Evolution frame. It is irrelevant whether the frame is a bolt-on hard tail, weld-on hard tail, softail or swingarm frame. Zodiac Performance Products and Vulcan Engineering both sell motor mount adapter plates that are intended to facilitate the installation of a Twin Cam 88A in an Evo frame.

Instructions

1. Bolt the Zodiac adapter plate to the rear engine mount with a hex socket and socket wrench. Grind the frame mount flush with the front of the adapter plate if any part of the rear engine mount protrudes in front of the adapter plate using an angle grinder.

2. Bolt the adapter plate to the engine with a hex socket and socket wrench. Mark the 3/8-inch wide cast gusset that is visible through the right side adapter plate window with a mechanics’ awl.

3. Unbolt the adapter plate from the engine. Grind the marked area of the gusset flush with the engine case casting to create spanner clearance.

4. Place, but do not bolt, the adapter plate on the rear engine mount. Align the two dowels included with the adapter plate in the engine bottom flange.

5. Slide the engine into the frame. Lift the back of the engine onto the adapter plate.

6. Bolt the adapter plate to the engine with the 3/8 by 2-inch Allen screws and washers included with the adapter plate using an Allen socket and socket wrench.

7. Bolt the adapter plate to the rear motor mount with the 3/8 by 1 3/4-inch Allen screws and washers included with the adapter using a Allen socket and socket wrench.

8. Wrench tighten the rear engine mount and adapter bolts to 38 foot-pounds of torque with an Allen socket and torque wrench after installing the stock, front engine mount.