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post #1 of 17 Old 05-22-2019, 07:53 PM Thread Starter
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New Addition: Commercial Toro

You know, I'm trying to clear mowers out, not add more, but sometimes it's hard to pass up a deal ($10). It's a Toro 22621 Commercial 21" with a Suzuki 4-cycle engine on it. I've never had one before.



Guy said it runs and the drive works, but blows smoke.

He's right on all counts. It starts right up on the first pull, drive system works well, and it blows blue smoke.

Having known of, but not dealt with the 4-cycle Suzuki engines, I have to say, wow, lots of power! Between that and the deck, it powers through grass that would big everything else down. Didn't leave any clumps behind either.

So this brings us to the problem: it blows blue smoke, always some, but more under load. Oil level is fine, so am I potentially looking at oil getting past the piston rings? Something else?

I just looked at the cost of parts for this engine...yikes!

Last edited by hanyoukimura; 05-22-2019 at 08:03 PM.
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post #2 of 17 Old 05-22-2019, 08:11 PM
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Re: New Addition: Commercial Toro

that's either a franken mower or a very rare model . never seen this one before.
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post #3 of 17 Old 05-22-2019, 10:29 PM Thread Starter
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Re: New Addition: Commercial Toro

Model number checks out for parts lookup.







https://www.partstree.com/parts/toro...-7999999-1987/
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post #4 of 17 Old 05-22-2019, 11:18 PM
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Re: New Addition: Commercial Toro

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Originally Posted by lawnboy dan View Post
that's either a franken mower or a very rare model . never seen this one before.
They are VERY hard to find indeed.

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post #5 of 17 Old 05-23-2019, 08:31 PM Thread Starter
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Re: New Addition: Commercial Toro

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They are VERY hard to find indeed.
All the more glad I picked it up!

I'll have to look into it more when I get back Monday. I'll be honest, usually when an engine smokes like that I either leave it, or use it for parts. Never tried to fix one before, but this is a pretty uncommon engine so I would like to try to find the cause and maybe fix it...if it doesn't break the bank!
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post #6 of 17 Old 05-23-2019, 08:57 PM
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Re: New Addition: Commercial Toro

I always wanted one of these Suzuki 4 strokes but all I ever found were bbc models -which I flat out refuse to own. start by doing a compression check. its either valve or piston ring related. you could always try some stp or lucas oil additive first and run 20 -50 oil
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post #7 of 17 Old 05-23-2019, 09:04 PM
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Re: New Addition: Commercial Toro

could be valve guides, valves or piston and rings. does it clear up or smoke all the time?

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post #8 of 17 Old 05-23-2019, 09:36 PM
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Re: New Addition: Commercial Toro

Nice.. I'd buy that all day long. I'd run it awhile and go from there...It might clear up..maybe not. Suzuki was pretty stout but it was probably used in a commercial setting and could be worn.
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post #9 of 17 Old 05-23-2019, 10:04 PM Thread Starter
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Nice.. I'd buy that all day long. I'd run it awhile and go from there...It might clear up..maybe not. Suzuki was pretty stout but it was probably used in a commercial setting and could be worn.
Definitely plan to run it, besides the smoke it works awesome and mulches really, really well.

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could be valve guides, valves or piston and rings. does it clear up or smoke all the time?
It doesn't seem to totally stop, but after it warms up smokes less until under load. Then it'll smoke more.

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I always wanted one of these Suzuki 4 strokes but all I ever found were bbc models -which I flat out refuse to own. start by doing a compression check. its either valve or piston ring related. you could always try some stp or lucas oil additive first and run 20 -50 oil
I like BBC, but I have noticed it saps the cutting power from the 2-cycler Toro in thick grass. I think the BBC on my Honda HRB215 works better, doesn't let the blade (or clutch or whatever) slip.
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post #10 of 17 Old 05-23-2019, 10:21 PM
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Re: New Addition: Commercial Toro

here's a few things to check:
Engine too full of oil
Engine low on oil
Cylinder head drain back holes are clogged
Valve stem seals and/or valve guides are worn out
Broken or worn piston ring
Plugged crankcase ventilation
Damaged cylinder wall and/or piston
Valves are worn, no longer seal

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post #11 of 17 Old 05-24-2019, 12:23 PM
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Re: New Addition: Commercial Toro

This could be a fix for the holed deck on my 20611. its Suzuki 4 stroke runs great and the 3 speed is all right Wanna double your money? I'm somewhere east of you.
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post #12 of 17 Old 05-30-2019, 10:28 PM Thread Starter
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Re: New Addition: Commercial Toro

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Originally Posted by spokes100 View Post
here's a few things to check:
Engine too full of oil
Engine low on oil
Cylinder head drain back holes are clogged
Valve stem seals and/or valve guides are worn out
Broken or worn piston ring
Plugged crankcase ventilation
Damaged cylinder wall and/or piston
Valves are worn, no longer seal
Haven't got a chance to play inspect it much yet. I did change the oil. After doing that, for a few minutes it seemed to hardly smoke, but eventually it began smoking again, especially under load. Looks like taking things apart for inspection will have to be up next.
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post #13 of 17 Old 05-31-2019, 10:56 PM
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Re: New Addition: Commercial Toro

Only thing that makes it a commercial is larger fuel tank. Most of the Toro commercial ones had the 2 stroke and bigger tank and I think it was plastic tank.
Those were the commercial BEASTS!
I like the GTS 4 stroke Suzukis but they don't have the power the 2 stroke does.
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post #14 of 17 Old 05-31-2019, 10:58 PM
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Re: New Addition: Commercial Toro

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Originally Posted by hanyoukimura View Post
Definitely plan to run it, besides the smoke it works awesome and mulches really, really well.



It doesn't seem to totally stop, but after it warms up smokes less until under load. Then it'll smoke more.



I like BBC, but I have noticed it saps the cutting power from the 2-cycler Toro in thick grass. I think the BBC on my Honda HRB215 works better, doesn't let the blade (or clutch or whatever) slip.
I'll take the Tor BBC over the honda or JD clutch any day!
The clutch will eventually ware out but the Toro will only need a belt.
It shouldn't zap any power but if it is slipping you will get slowing blade speeds that will reduce quality of cut.
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post #15 of 17 Old 05-31-2019, 11:05 PM
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Re: New Addition: Commercial Toro

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Originally Posted by lawnboy dan View Post
I always wanted one of these Suzuki 4 strokes but all I ever found were bbc models -which I flat out refuse to own. start by doing a compression check. its either valve or piston ring related. you could always try some stp or lucas oil additive first and run 20 -50 oil
Why do you hate the BBC ones?
They are still my favorite mower to this day. With the JD with kawi being 2nd.
I like the personal pace "idea" but in actual use I find the 3 speed with the lower lever to be the easiest to mow with and turns are easier than the personal pace as all I have to do is modulate it with one finger.

The only thing I dislike about the rear bagger aluminum models wer are talking about is they are great for mulching or bagging ( I guess I don't bag grass) but no good discharge for taller grass.
The rear turn chute clogs too much to be very useful.

If the old aluminum ones had the side flap discharge like the newer Personal Pace it would be the bomb for me.

Some people need smooth side mowers with no discharge flap though if they are used to mowing along a fence on the right side.
Hard to change mowing habits and they will damage it right away if you give them one with a flap over there.
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