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Engine runs rough when we throttle up

We have a 40hp 2 stroke Yamaha engine on our boat. It ran great then it started to run rough when we would increase the throttle. It was intermittent at first, now it is all the time. We changed the plugs, new gas filter,carburtor was taken off cleaned and adjusted . It worked great for about 20 minutes then we shut down and anchored. When we were off on our way again it started all over. Could this be an electrical problem. Please help, Mike

Research, Knowledge and Information :


Misfire - Runs Rough P0300 Codes - 2CarPros


How to Fix a Misfire. ... it will cause the engine to misfire and run rough due to the loss ... An engine tune up is necessary at manufacturers recommended intervals ...
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Rough Idling Issues | MotorWeek


Rough Idling Issues. ... One of the very common problems that we see ... Now naturally the car is not running during this because you don’t to blow up the engine, ...
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Engine Starting and Running Troubleshooter


Troubleshooting starting and running problems can ... and the engine runs smoother. If the car idles rough this can ... at full throttle and will ...
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Warm engine idles rough and stalls. Runs fine when cold


Mitsubishi Galant idles rough and stalls with warm engine but runs ... If the problem were to maintain afterward we would ... I'm gonna pick up a throttle ...
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Engine running rough on throttle down after cruise | Pilots ...


This has just popped up on the last 6 flights: Engine feels like it is ... Engine running rough on throttle down ... but it runs rough right after throttle ...
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Engine Runs Rough - Car Repair Information From MasterTechMark


Car Repair Information From MasterTechMark. ... Let us not forget that the engine runs rough condition can be caused ... The exact opposite of what we all expect from ...
Read More At : www.certifiedmastertech.com...

Curing Rough Idle - Classics on Autotrader


Curing Rough Idle. Cars need ... What results is an engine that runs rough and frequently stalls. ... up through a tube into the throttle body, ...
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Runs Rough Above Half Throttle or Up Hill at Low Engine Speed ...


Runs rough above half throttle or up hill at low engine speed I changed plugs and wires but that only raised the speed that the roughness seems to ...
Read More At : www.2carpros.com...

Saab 9-5: engine runs rough and wants to die. Engine light is on.


We have a 2005 Saab 9-5 Arc ... engine runs rough and wants to die. ... some references I've pulled up show the error code is for the throttle body ...
Read More At : saabworld.net...

95 S10, missing, running rough, no power - please help! - S ...


95 S10, missing, running rough, ... but only to about a quarter throttle then it's it - it starts to idle up and down and I have to back ... missing, running rough, ...
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