Classic Motorcycle Build

Servi-Car Restoration

Text and Pictures by Mark Trotta

Not too long ago, Harley-Davidson Servi-cars were easy to find and cheap to buy. Today, if you can find one that hasn't been butchered and actually runs and drives, it'll set you back as much as a vintage Shovelhead.

Harley-Davidson Servi-car restoration

Part of the reason for this is many of the original Servi-car frames have been cut apart to make custom trikes, solo Flatheads and WL clone bikes.

The Purchase

In 2014, I was searching for a new motorcycle project. I saw an ad on ebay for a Harley 45 motor with frame and extra parts. The engine case number (61G-XXXX) told me it was a 1961 Harley trike, and I got the idea that if I could buy it for the right price, I could restore a Servi-car from the frame up.

Shortly after winning the bid, I hopped into my truck and drove out to pick up the engine, frame, and parts. Included with the purchase was several mismatched wheels, incorrect gas tanks, and boxes of assorted Harley parts. I was able to sell enough of the unwanted parts to get back what I had initially laid out. And so began my Harley Servi-car restoration.

Harley-Davidson Servi-car parts

Considering it's now a half-century old, the Servi-car frame was in great shape. Looks like it was never repaired and all the tabs and mounts are still there.

Read: Prep and Paint Frame

Harley-Davidson Servi-car frame

After bringing my Servi-car project home, I started locating and buying parts. I found a Servi-car rear axle with wheels, drums, and backing plates on ebay. The seller was willing to negotiate a little.

Harley-Davidson Servi-car axle rebuild

Read: Rebuild Servi-car Rear Axle

Harley Flathead 45 Motor

Whatever work an old engine may need can only be determined after complete disassembly and inspection. The 45ci flathead motor was gone over top to bottom, including splitting the cases and checking the bottom end.

Harley 45 flathead engine build

The Harley-Davidson flathead 45 motor was one of the Motor Company's most durable designs. Displacing 45 cubic-inches (750cc), the engine was so simple and so reliable, it stayed in production for 38 years. All original Harley trikes produced from 1932 to 1973 were powered by the 45ci flathead engine.

Read: Flathead 45 Engine Build

Harley 45 oil pump repair

Read: Harley 45 Scavenger Oil Pump Repair

Servi-Car Brakes

I have heard from several old Harley trike riders that original Servi-Car brakes are marginal at best. There are two reasons for this. First, the front drum is under-sized for a 900-pound vehicle, and second, although the rear brakes work well, there is a lot of weight on them.

Read: Servi-Car Rear Brakes

Wide Glide conversion

I found a used Wide-Glide front end on CL. It's not correct for a Servi-car, but it will allow me to run a front disc brake.

Read: Wide Glide Front End

Servi-car build

Harley 45 Drivetrain

I found a fresh rebuilt 3-speed w/reverse transmission on ebay. These are different than big-twin units; the 45 trans has the primary on one side and the drive on the other side. Servi-car transmissions use a different kickstart extension and side-cover than 45 solo models.

Servi-car transmission

All Servi-car models were foot-clutch/hand-shift. Most were left-side shift, but some (mainly Police models) were right-side-shift.

Servi-car seat

After the engine was rebuilt and back on the frame, it was time to assemble the drivetrain. All 1941-1973 Harley 45 models are basically the same. Some Servi riders have switched to a bigger-tooth gear, but I chose to keep the stock 22-tooth motor sprocket.

Servi-car restoration

Read: Servi-car Drivetrain

Chain-drive vs Belt-drive

Although belt-drive conversions are popular, I decided to run the stock primary chain for several reasons. First, belt drives need a very precise alignment. The flanges on belt-drive pulleys are not intended to guide the belt. If alignment is not precise, the belt will use the pulley flanges as guides, which will wear out the belt prematurely. Second, primary chains are much more forgiving - they will still work well even with a fair amount of discrepancy in location. A chain will also "curve" to allow for differences between transmissions.

Servi-car Gas/Oil Tanks

For over a year, I looked for a set of original Servi-car gas/oil tanks on ebay. I watched and bid on several rusted, dented, original Harley tanks, all of which eventually sold for $900 or higher. Finally, I bought an aftermarket set for half the price.

Harley-Davidson Servi-car Gas/Oil tanks

Read: Servi-Car Gas/Oil Tanks

Servi-car Box

Harley-Davidson Servi-car cargo box

The Servi cargo box in the picture above had been in storage for over 30 years. It took untold hours to sand down to bare metal and paint.

Read: Cargo Box and Fenders

Harley-Davidson Servi-car restoration
Harley-Davidson Servi-car cargo box

A Servi-car box is never empty.

Electrical System

The Servi-Car electrical system was the last major part of the restoration. Because the trike was missing most of the electrics, there was really no extra expense for me to upgrade from 6-volts to a 12-volts.

Harley-Davidson Servi-car restoration

Read: Custom-Wire Harley Servi-Car

Not much more frustrating than trying to figure out electrical problems on an old Harley. I saved myself a lot of hassle and bought a Cycle Electric generator/regulator.

Servi-car restoration

Read: Harley Generator - Repair or Replace?

Harley 45 igntion timer

Read: Harley 45 Timer And Ignition

Harley-Davidson did not make a lot of Servi-Cars, and there's not many left out there. That's why there are so few choices for those of us needing an exhaust system.

Harley-Davidson Servi-car exhaust

Read: Servi-Car Exhaust And Why Getting Parts Is So Frustrating