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Brent Dugan
Rebuilding a 1962 Scat 175cc engine

Click on pictures to enlarge

I've done my own motor work since I was 14 years old. In fact, I've done ALL my own work since I was 14 years old! That, along with getting my Journeyman Machinist license, has paid the bills all these years.
I picked up this 1962 well worn Scat from an old local farmer through Craig's List. He was the surviving brother of 2 that rode the Hell out of it on the farm until it just wouldn't run one day. It hit the back of the barn until the day he decided to list it. Somewhere "back in the 90's" he repainted the gas tank to get himself motivated to bring it back to life. Life got in his way again.

I disassembled the motor on my work bench and started hawking Ebay and friends for parts. The parts kept coming in while the motor sat...for over a year. I finally decided to do something with it. I decided to send it to Mutt down in Wills Point, Texas. I chose him because of his reputation and the fact I heard he sends pictures and keeps his people informed. I rarely give work to anyone else because I'm too 'particular' (read: anal) about the details.
It seems Mutt is 'particular' also.
I explained that I wasn't looking for a 'restored show motor' but one that would be ridden. I just wanted it to look 'clean' and run great.

As your webmaster I can't endorse one vendor over the other. I made a decision on who to send my motor to and I'm sharing the experience with you.
Let the journey begin......

From Mutt's emails the cylinder was 1st out of the box. The bike only had a little over 3K miles and sported a Standard sized piston. I sent Mutt a Hepolite .010" over in hopes only a honing would be nessecary. Mutt ran the hone though it and it cleaned up except for some minor pitting at the top where the rings don't go. I told him it was okay.


Next was to check out the casings. A couple of problems were found; a broken off stand-off, stripped hole, and a need for a new stand-off to name a few. The stand-off was welded in and a helicoil installed where needed.

Further inspection found an oversized bushing, spun bearing support, and a clamshell casing with shifter wear that rubbed through.


With repairs completed he fitted a Stuffer Plate I sent him, then assembled the cases to spin the crank for a clearance check. He recontoured it for proper clearance.


Assembly piston checked for flywheel clearance after 'Factory' modification:


Followed by.........


1962 version of electronic ignition (no battery required):


The other side.....fresh Parkerizing and old sloppy chain replaced.


Got spark, now carb...worn throttle shaft bushings found (read: air leak/bad running):




Final assembly:


I sent my flywheels to Mutt a year back to have them rebuilt with all new parts. Since I wasn't rebuilding the motor I sent them back with the rest of the motor. He re-trued them and installed them with new bearings and seals throughout the engine.

The teaser photos? When Mutt first started the engine with the stock carburetor it wouldn't idle. The Stuffer Plate had changed the fuel/air mixture requirements. The photo on the left is of the stock metering nozzle that made the motor run too lean. The right photo is of a metering nozzle from an Evinrude boat motor carb. Watch and listen to the video and tell me if it sounds like he knows what he's doing (Hint: He does)

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  Last updated: April 12, 2017 Up