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New Engine To Replace 3.5 Briggs? #5466084 06/30/20 06:35 AM
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Mr_Joe Offline OP
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I have an older ‘Power-Tow’ for moving light planes. It’s likely over 35 years old, solid shape, but almost impossible to start. I tried the carb cleaning & refurbishment. It also been to a small engine shop, no appreciable improvement. My next idea is to get a new engine.

I just want something I can start without resorting to starting fluid & a 20 minute ordeal.

Here are the engine stats, 3.5 HP. Any tips on a direct replacement, Briggs, Honda, or whatever type?

8263E753-3E3C-48E7-85C9-5ACAECFD7B44.jpegCEDC0FA3-1E72-4B3D-B325-884326B79272.jpeg
Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466088 06/30/20 06:41 AM
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skyactiv Offline
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What about a Predator engine from Harbor Freight?


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The rude guy that points out reality


Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466091 06/30/20 06:43 AM
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Mr_Joe Offline OP
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Would it bolt right on? Minimal fuss? As one would imagine, this is a very low hour setup, averaging, 20 minutes every 10 days.

F1FBD605-2C23-4F5A-8374-E61B6D86FF1C.jpeg
Last edited by Mr_Joe; 06/30/20 06:44 AM.
Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466092 06/30/20 06:44 AM
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Wife: 15' Audi A4 quattro 6 speed manual
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The rude guy that points out reality


Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466094 06/30/20 06:48 AM
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javacontour Offline
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You could probably find a brand new $150 lawn mower with that family of engine at your nearest big box discount store. Strip that engine and bolt it to your setup there.

Have you tried to simply replace the carburetor? Just because it's been to a small engine shop doesn't mean it's been to a good one. Seems like it's in pretty decent shape. However, it has been 35 years. Just thinking out loud here.


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Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466099 06/30/20 06:53 AM
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Mr_Joe Offline OP
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Isn’t there more to it that ‘bolting’ to my setup? Are they standard mounting patterns? What about shaft setup?

Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466103 06/30/20 07:02 AM
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dnastrau Offline
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I have a mower with a similar Briggs engine. If the primer bulb is not working correctly, it is very hard to start. Try removing the air cleaner and use the primer to see if gas squirts down the throat of the carburetor. Even if you end up replacing the primer or the whole carb, it would be cheaper than a new engine.

Andrew S.

Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466108 06/30/20 07:08 AM
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Mr_Joe Offline OP
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I have a new primer bulb, gasket & carb cleaning, & a few other things. At this point I was planning on changing directions.

Yes, the shop may of been suspect. Total carb replacement may be an idea.

Last edited by Mr_Joe; 06/30/20 07:09 AM.
Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466110 06/30/20 07:11 AM
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javacontour Offline
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Most engines are pretty standard. If you had to drill one new hole, it's not that big of a deal, is it?

Looks like the thing is belt driven, so any engine you get, you may have to get a different pulley for the crank of the engine if the one currently on there doesn't fit exactly.

Different engine makers have different crank shaft diameters, so the pulley may not fit a replacement engine.

I would be more concerned about the crank diameter than I bolt line ups.

I've replaced a B&S with an Harbor Freight engine and it bolted right up to my mower deck. The crank was different, so I needed different hardware to mount the blade.


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Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466114 06/30/20 07:17 AM
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Mr_Joe Offline OP
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No, not a biggie, new hole. I may look into carb issue again before a new engine. This engine has low hours, just needs to start MUCH easier.

Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466115 06/30/20 07:22 AM
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javacontour Offline
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If you do get a new engine, I suspect the one currently on there has a 7/8" diameter crank. Many of the HF engines are 25mm, so a new pulley. Obviously, measure the distance of the pulley from a fix location such as the base above it, before swapping so any new installation can be replicated by placing the pulley at the same distance from the base.

You got this!


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Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466121 06/30/20 07:33 AM
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DukeOfFrontenac Offline
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Replaced the Briggs in my power washer with a HF Predator. Bolted right up. Bonus is the HF motor starts on 2nd/3rd pull every time. The Briggs engine was a 5-10 puller from brand new.

Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466131 06/30/20 07:44 AM
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dippschtick Offline
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Since this is BITOG, what kind of oil have you been running in it?

Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466141 06/30/20 07:57 AM
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Mr_Joe Offline OP
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The last time I dealt with oil in it was lighter weight synthetic. The reasoning being it doesn’t run long, though I have let it warm up a fair amount. I used along the lines of 5w-30 or so.

Re: New Engine To Replace 3.5 Briggs? [Re: Mr_Joe] #5466148 06/30/20 08:09 AM
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Bailes1992 Offline
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That looks identical to the 149cc Briggs 450 I have in my lawnmower. You can pick up an entire fuel tank & carb assembly very cheaply. I can't imagine much could go wrong with these.


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