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What causes outboard blow out #14340810 04/11/22 08:37 PM
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kirbydog Offline OP
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Don't know if I'm using the correct term, I put a higher pitch prop on my outboard and sometimes when
I'm going down the lake at full throttle the motor seems to over-rev and I have to reduce the rpm's for a bit and then it
seems to work ok.

What causes this.

Re: What causes outboard blow out [Re: kirbydog] #14340818 04/11/22 08:52 PM
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jippedgenes Offline
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Cavitation but as to why that occurs I do not know the mechanics of pitch and cup on prop blades.

Re: What causes outboard blow out [Re: kirbydog] #14340827 04/11/22 09:04 PM
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grout-scout Online Content
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Catching air, I would think you could lower it a little bit and it’d help. What kind of pitch, boat and prop are you talking about?

Re: What causes outboard blow out [Re: kirbydog] #14340828 04/11/22 09:04 PM
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tmd11111 Offline
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Air around the prop. Either the prop to pad is too high causing the prop to lose grip or if its a high performance rig getting into the mid to upper 80 mph range then blow out which if you've never experienced can be quite the thrill.

Edit: over trimming can cause it as well. Not enough speed to hold the bow up, prop looses bite and slips.

Last edited by tmd11111; 04/11/22 10:08 PM.
Re: What causes outboard blow out [Re: kirbydog] #14340908 04/11/22 10:20 PM
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hopalong Offline
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answer the following for a better guess.

boat make model etc.

engine, make hp

jackplate?

if no jackplate what hole is the top bolt in on the engine bracket?

prop?

pitch?

worked?

answer those and I can probably help ya


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lake fork FISHERMANS COVE MARINA/reservations - 903 474 7479
Re: What causes outboard blow out [Re: kirbydog] #14341361 04/12/22 01:38 PM
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kirbydog Offline OP
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I need to look at my boat to get those numbers.

Re: What causes outboard blow out [Re: kirbydog] #14358292 05/02/22 11:26 PM
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My ZX200 did it last weekend but on the launch with the motor tucked all the way in. I've been doing some maintenance on the fuel system getting everything back in order and the power has come back to normal. I bought it as an older low hour boat, but it had a very dirty fuel system, and it didn't run all that great at first. I've been steadily adding fresh fuel every time I burn some off and a can of Sea Foam or Berryman Chem Tool plus I've changed all the filters but the ones in the VST (already bought one of them). It REALLY liked what I've done so far and you can really tell it on the hole shot. I run a 2012 200 SHO with a Yamaha Vmax 15.25 x 25 prop and it peaks @ about 5750 on the RPM's and runs anywhere from 63 to 69 mph with a slightly damaged prop. Like I said, the blow out came with the motor fully tucked in on a launch to get on plane. When it happened I thought it probably spun the hub but I've launched it a dozen or more time since then and it hasn't done it anymore. I just wondered if I needed to raise or lower the jackplate a bit?


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Re: What causes outboard blow out [Re: tmd11111] #14358468 05/03/22 02:19 AM
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Originally Posted by tmd11111
Air around the prop. …….
Edit: over trimming can cause it as well. Not enough speed to hold the bow up, prop looses bite and slips.

This would be my best, uneducated guess.


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Re: What causes outboard blow out [Re: ogles824 (aka Lakewaydr50)] #14358677 05/03/22 01:56 PM
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hopalong Offline
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Originally Posted by ogles824 (aka Lakewaydr50)
My ZX200 did it last weekend but on the launch with the motor tucked all the way in. I've been doing some maintenance on the fuel system getting everything back in order and the power has come back to normal. I bought it as an older low hour boat, but it had a very dirty fuel system, and it didn't run all that great at first. I've been steadily adding fresh fuel every time I burn some off and a can of Sea Foam or Berryman Chem Tool plus I've changed all the filters but the ones in the VST (already bought one of them). It REALLY liked what I've done so far and you can really tell it on the hole shot. I run a 2012 200 SHO with a Yamaha Vmax 15.25 x 25 prop and it peaks @ about 5750 on the RPM's and runs anywhere from 63 to 69 mph with a slightly damaged prop. Like I said, the blow out came with the motor fully tucked in on a launch to get on plane. When it happened I thought it probably spun the hub but I've launched it a dozen or more time since then and it hasn't done it anymore. I just wondered if I needed to raise or lower the jackplate a bit?




first thing is to get the prop in good shape, get it to josh at steves custom props in quitman and he can make it better than new. go run it after that and see what happens.


" Hop, set the hook"!
hopalong 99,999
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FJB! not my president by a long shot!

lake fork FISHERMANS COVE MARINA/reservations - 903 474 7479
Re: What causes outboard blow out [Re: kirbydog] #14358779 05/03/22 03:35 PM
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If you do not have plugs in the prop it can also cause blow out.

Re: What causes outboard blow out [Re: kirbydog] #14384893 06/04/22 03:24 PM
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Deude_Mann Offline
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+1 on too much trim. I adjusted my technique to increase trim until RPM and speed stop increasing, then decrease it just a bit for a little bit of insurance. I might lose 1-2 mph at WOT but it's better than cavitating the lower unit/prop and losing steering.

Last edited by Deude_Mann; 06/04/22 03:25 PM.
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