All posts categorized Small Engines

Unique Subaru Robin EX21 7HP Engine with EFI

While looking for not running cars on Craigslist, I came across this Subaru Robin EX21 engine that claimed to have 7HP and had Electronic Fuel Injection (EFI). The seller said it was not running and had fuel injector problems and wanted $50 for it. I offered the seller $30 and got it for myself. The goal is to see if I can fix it up and learn something in the process. Cheap education !

Two years ago I acquired a Briggs & Stratton engine which still does not run as I have not disassembled it yet 😞 and not had time to. The plan is to fix both these engines by the end of the year, hopefully. Then I will try to make a go-cart with them.

These Subaru Robin EX21 engines are rarer than the Briggs & Stratton or the Predator engines found in lawn mowers and pressure washers. I think this is from a generator, but cannot be sure. Either way, 7HP is nearly as powerful as those 80cc two-wheelers being used in various Asian countries, so should be interesting.

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Oil Change in the Briggs And Stratton Engine

Before I fix the ignition problem on the Briggs and Stratton engine that I bought on a whim the other day, I needed to complete an oil change.

I looked at the Operating and Maintenance manual and it said I needed to use 590 mL of SAE 30 weight oil which I bought at my local auto parts store for about $7.

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Antique Briggs And Stratton Engine

On a whim, I started looking at Briggs and Stratton engines on Craigslist this week, and ended up getting a great deal on an antique horizontal shaft 3HP engine made in around 1989 or 1990 for just $20. It was owned by a retiree before this and she was just getting rid of junk in the garage. The engine did not start at the time, and that plays well into my plan of disassembling and learning how the engine works and fixing it.

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