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  #1  
Old 05-11-2017, 02:42 PM
EWK EWK is offline
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Default Problem with Yamaha 4 Stroke tiller Carbed

Went fishing , motor ran PUURFECT . Did a couple runs around sizable lake and everything fine .went to another water body 20 miles away . motor started and ran perfect . Moved to a different spot & motor started & ran fine then gave it full throttle & took off like a jet as usual , got up to full speed for a few seconds & started to bog , miss ,down to 2000 rpm, gave it gas & still bogged . Turned key off , started it back up & ran fine , gave it full throttle again & when it reached speed it bogged again down to 2000 rpm . I checked everything visible , seemed good . Started again & purred perfect . Gave the throttle again & same problem , hit full speed & bogged down to 2000 rpm . One mech said 'GAS ' my problem with that is , when turned off & restarted it goes like crazy for a few seconds . I tried this a number of times & nothing changed .Sorry for the Epistle , but I needed to explain . Please Anyone ?????
Thanks for reading .
EWK
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  #2  
Old 05-11-2017, 08:55 PM
Bigfishhunter Bigfishhunter is offline
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A few years ago, I had a 50 merc that did the same thing. I blamed fuel. Till someone smarter than me told me it was my voltage regulator. Got a new voltage regulator, problem solved.

Now, I am not saying it will be the same for you as mine was an efi motor, not carbed, so not sure if that will be playing into it or not. I am no mechanic, but your symptoms are identical to what I had experienced.
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Old 05-12-2017, 05:33 AM
jrdonicht jrdonicht is offline
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Could be starving for fuel at wide open. Check some simple things first like your primer ball[is the check ball sticking?] Sucking air threw the gas line. Check your fuel filter.
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  #4  
Old 05-12-2017, 05:43 AM
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Shellback Shellback is offline
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Give it a good dose of Seafoam before you start tinkering. I've found it to work wonders.
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Old 05-12-2017, 06:06 AM
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cyber16 cyber16 is offline
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could be a coil problem as well, once coil reaches a certain temp, it will begin to fail providing spark. Merc had this problem some years ago, coils with small hairline cracks act the same. they had a service bulletin.
As others also said, could be fuel restriction, also check the fuel filter.
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  #6  
Old 05-12-2017, 07:06 AM
EWK EWK is offline
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Default yamaha

thanks for the tips . The Fuel filter is new , primer bulb is hard , drained all fuel last fall
replaced plugs last fall . This spring all fresh , non corn fuel , from a busy station. Added Merc Quick clean & can of Seafoam , which is my blend of choice always . Like i stated engine ran perfect for a total of about 15 min at full throttle then developed the prob . I'm thinking electrical like was stated , because if I turn key off . then start , it goes up to full throttle for a couple sec then dies off . if I take it down to idle while missing & then try full throttle it just keeps missing .
But if i turn Key Off , then start it will power right up to full bore & then start to die off.
thanks for the ideas Fishermen , really appreciated .
EWK
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Old 05-12-2017, 09:50 AM
jrdonicht jrdonicht is offline
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Take a look at your plugs and read them see if you have one cylinder different from the rest. Definitely could be coil as previously said or even a spark plug which I have seen fail when it got hot.
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Old 05-12-2017, 02:39 PM
Johnboy Johnboy is offline
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Is the vent on the fuel tank open ?
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Old 05-12-2017, 03:47 PM
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Does the primer bulb pump up to be full or is it hard like a brick? If that bulb is rock hard it could be shot.
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Old 05-12-2017, 03:48 PM
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Add a little shot of ring free in your fuel now and then
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