Engine swap

Well, as I expected, the old Briggs was shot. So I picked up a new 22 HP, 670cc, V Twin engine from Harbor Freight. Price was 699 but I had a 25% discount coupon. Then I bought the 2 year extended warranty for 175, so final price was back near that mark. It has a 1 inch diameter shaft, same as the 18 HP Opposed Twin Briggs.


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So I got the old motor out and did some reference measuring to determine where the new motor needs to mount on the mounting plate, in order to match the clutch alignment.

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Update 11/30/14

The 22hp motor had a completely different mounting base dimension and base to shaft dimension. So some spacers were in order and the mounting plate had to be re-drilled.

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Total thickness of the spacers for each hole is 1.39″. 1.25 would have been exactly what was needed, I had these two aluminum stock plates that added up to 1.39. I could have milled them down on the CNC mill but I didn’t think it was critical enough to take the time to do that.

So, as the old saying goes, measure twice and cut once. Well I don’t know how I did it but some how when I went to transfer the measurements to the motor mounting plate, I was off by 2″. Not sure how I made that much of an error but I did. Here is a video of what I ended up having to do to the mounting plate.

Below is a video of the engine mounted and running.

Video of first test drive


It sounds like the T20 Transmission is in need of a rebuild. Thanks to Spideytank for the youtube video on this process. I will order some parts and start this next.