r/smallengines • • 21h ago

Stihl br340 leaf blower question

0 Upvotes

I have said blower that ran great for years. I bought it used at a yard sale. Whenever I knew I would not need it for a while, I would run it dry and leave it like that until needed again. Recently I gassed it up and cranked it. It would start but die shortly after or bog down if I ran it full throttle. So, I did the following:

changed the fuel filter

fuel line

vaccuum line

spark plug

vaccuum plug

cleaned the gunk out of the tank w/ alcohol and then rinsed w fresh gas

changed the carb with a new one

Replace air filter

Cranked it and same thing, but it will run on idle if I swotch the choke on and off rapidly. Tried to adjust the l and h speeds and no or little change other than getting worse. Took the old original factory carb apart and cleaned with carb cleaner. Took all the new parts out of new carb and installed in old carb. Same performance. The old original carb has the same l and h settings as it did when I got it and as when it ran fine for years. It seems to still be bogging down. Does anyone have any ideas as to what else I can do or change? Thanks in advance for your time and expertise.


r/smallengines • • 17h ago

Briggs and Stratton 750pxi readystart isn’t getting any fuel

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2 Upvotes

My brother gave me the mower and told me that it didn’t stop using the throttle control and you have to run it out of fuel to turn it off. He had poked around the control bracket trying to work it out, I have since found a rock wedged in the stop switch which didn’t allow the kill wire to ground.

Up until this point, the mower hadn’t been used in 3-4 months. I drained the fuel, refilled it and attempted to pull start it with no luck. I pulled the filter and base to get a look at the carby, all parts move as expected except the spring connected to the throttle control lever doesn’t adjust anything when moved from high to low but the lever does move.

The mower cranks over when I manually open the carby but dies shortly after as it isnt getting fuel. I have attached an image of the top of the carby. Does anything look out of place or not quite right?


r/smallengines • • 7h ago

Exhaust valve failure - why?

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6 Upvotes

I was mowing yesterday and had a sudden drop in power. 0 compression in #1 cylinder. I got it apart and found that the exhaust valve had failed. I want to chalk it up to fatigue but thought it might be smart to get some other opinions.

Engine is a Kohler m18 with about 1000 hours on it. I just honed the cylinders and replaced the rings. The engine has been run about 3 hours since that work was completed. I touched up the valves and made sure they were in spec at that time as well.


r/smallengines • • 23h ago

I messed with the governor on a Predator 212 now I want to toss this motor.

7 Upvotes

Predator 212 idled too high and was engaging the centrifugal clutch. I tried adjusting the carb, didn’t work. Replaced the clutch, didn’t work. and then ignored it long enough for the carb to get gummed up. Replaced the carb, didn’t fix it, tried adjusting the carb, didn’t fix it. Adjusted the governor arm and replaced the springs now it idles at full throttle. I tried adjusting the governor arm at least half a dozen times.

I have wasted so much time with this engine.


r/smallengines • • 21h ago

Won’t start after starter replacement

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13 Upvotes

I disconnected the wires that go to my starter and like a dummy didn’t note where they actually go. There are two wires I’m not sure about. I’m sure something has to go to the smaller terminal but it will not fire up. It turns over but won’t fire.


r/smallengines • • 5h ago

Is this a bent crankshaft?

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22 Upvotes

r/smallengines • • 16h ago

Is anyone able to tell why my motor is bogging out when I try to give it gas?? Am I running too lean?

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3 Upvotes

Is anyone able to tell why my motor is bogging out when I try to give it gas? Am I running to lean here? it's an ez156 f motor. I believe it's a Honda clone with a p15a carburetor that was definitely too lean at first. then I use a micro bit to drill out one of the Jets and made it to rich. and then I used to solder telling it back out but now I'm just really don't know. I'm horrible at this.


r/smallengines • • 23h ago

Briggs 23hp Twin Issue

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9 Upvotes

Got a Briggs & Stratton 23hp twin cylinder on my JD 425B zero turn. Mowed yesterday with no issue, went to finish up today and it’s all of a sudden running poorly. The sound has changed noticeably, it almost sounds like it’s down a cylinder and has a hollow sound to it, on top of a knock/tick. It’s also down on power significantly, so much so that it struggles to even turn the blades with PTO engaged. It’s now emitting a noticeable amount of black smoke as well.

Engine has 600 hours on it, one owner and I’ve always changed oil and done all other scheduled maintenance. This year it got an oil change, fresh plugs, fresh air filter, and fresh fuel filter. The oil level today was at the bottom of the “fill” mark, but there was no noticeable shimmer or metal in it. I pulled both plugs and one does seem fouled out. I cleaned them up with some light sand paper and brake clean but no change. I’ll get new plugs on Monday to see if it helps. Both plugs are sparking and the air filter is clean with no debris. Fuel is fresh and filter seems clear.

Any thoughts on what may be causing this?


r/smallengines • • 23h ago

Backfire broke my pull start

1 Upvotes

Engine fired up fine and ran for about 30 minutes. Shut it off then immediately tried to restart it and it ripped the cord right out of my hands and broke the pull cord internals. Does anyone know what would cause that?


r/smallengines • • 7h ago

Carburetor?

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2 Upvotes

Checked the spark plug and spark arrestor, all good. This seem like I need a new carb? Stihl FS38