Yamaha 100hp Outbourd Starting Issue - Problem Solved!

In this video I run you through a quick process to fix your boat motor when this starting issue arises. This is a common fault with this model Yamaha so if yours isn’t starting be sure to check it!

[@paolorighi3752]

Hi I have a similar problem, in the same motor. The engine start fine at first, but after like 6 miles at 4500 rpm when I put the gas at the minimum the engine goes off and it won't restart. To restart it i need to let it cool down or to open the butterfly manually. Can you help me pleaasee.

[@staffannorman2292]

Solved my problem Thanks!! from Sweden 🇸🇪

[@ProTechAutomotive]

Glad I could help mate! 🤝

[@gerardoramos382]

Just ordered part Yamaha F90 2008 (309 hours), 6D8-13105-03-00, yamaha software indicated my ISC was at 60% and upon testing (i did hear a noise) would not go over 80%. Could be the sensor portion of it. Started acting up one day by not planing and started going downhill from there. When I flushed the engine, it was running as it was acting up. Next month, didn't want to start. I recently replaced VST fuel filter parts like you said in the video (that was fun), getting spark and fuel. That leaves the ISC in which I will replace upon arrival. Thank you for the video and will keep you posted.

[@ProTechAutomotive]

No worries mate! Hopefully you get it up and running again soon. Let me know how you go👍

[@salih_tinas]

I have a yamaha F100 and It just works fine at the first then a few moment later while running high rpm, the rpm goes down and engine stops. After a few manuel pump to fuel It works againg but not for a long time, and it stars to make it on low rpm now. would I have the same problem ?

[@ProTechAutomotive]

Your issue sounds slightly different. My issue was it wouldn’t run on idle but would run with the revs high. Sounds like you might have a fuel issue. Check where the fuel hose goes from the manual pump through into the motor. They can get kinked there and no get enough pressure through. It will idle but won’t have enough fuel to rev it up.

[@kevinbonk2244]

Solved my problem….thx

[@ProTechAutomotive]

No worries mate 👍🏼

[@kevinbonk2244]

@@ProTechAutomotive Curious if you have any advice. After replacing the ICV about a month ago the boat ran great. Now the problem is back.

[@ProTechAutomotive]

@@kevinbonk2244 did you buy a genuine Valve or a cheap aftermarket one? If replacing it solved the problem but the issue later returned, chances are the new part is faulty.

[@swedishkev]

hello mate, are you not supposed to hear a beep, when you turn the key ?

[@ProTechAutomotive]

Yes a lot of motors do beep when you turn ignition on but this model has never done that.

[@chrisperry7074]

Damn that part is expensive

[@ProTechAutomotive]

Sadly anything with Yamaha written on it is expensive😂

[@tofamarsters9308]

I have a 100 hp yamaha that is giving problem the main fuse keeps blowing even when the ignition is disconnected can you help me

[@ProTechAutomotive]

So the fuse blows even with the key off? Easiest way to solve that is to go online and find a wiring diagram for that motor. From there you can find out what is on the same circuit as that fuse and remove them from the circuit. Add them back in one by one until the fuse blows and you will know what caused it to blow. Hopefully this makes sense 😂

[@ProTechAutomotive]

Also how many hours on your motor? If it’s a bit older the regulator burning out is a common fault on the 90 & 100hp. That will blow a main fuse