Yamaha Prime Start diagnosis

Рет қаралды 137,303

8 жыл бұрын

This video goes through removing, diagnosing and servicing the Prime Start system from a Yamaha outboard motor.
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Пікірлер: 211

@jillveefkind2847 2 жыл бұрын

Just wanted to say thank you. I defiantly learned how it works. Whatever happen to a simple manual choke. Some engineer must of had a dream! Thanks again.

@spyros1212 3 жыл бұрын

YAMAHA 2 stroke the best !!!

@Shareyourpositive 5 жыл бұрын

I’m working on the identical engine now. I found a split diaphragm and replaced it. It will not start in normal position. It will start and run in emergency. After it is warm I will switch it to off and it will not run. The carbs are clean. Fresh fuel with new fuel filters. Al jets and holes are clean and free from trash. What would you suggest now? I have not tested the prime start and don’t think it is the problem since it will not run when warm.

@MrMatthewkirby 4 жыл бұрын

Bad starting, checked everything and it was working. Decided to strip that carb down one more time and found a small hole from the main fuel bowl into the thin fuel bowl to the side was blocked, this then feeds the prime start. Cleared it out and it started without using easy start. Worth checking.

@msohel 2 жыл бұрын

Hi would u please tell me why the carburetor starts pouring out fuel after I have reinstalled them. The float and the middles all new. I took them off again and reinstalled same thing. Please help. I have exactly same motor. I followed u same , can’t figure out what’s wrong. Motor starts up right way after I Installed every time. But starts flooding in few seconds of running.

@mickbanks68 14 күн бұрын

This has heled me heaps.... Looks like the prime start white diaphram is cracked

@edgewatersbestguitarist1524 6 жыл бұрын

really glad to know that prime start isn't supposed to "click" open/closed when its activated like a choke mechanism. thanks for all the explanations! cheers

@SharpByCoop 3 жыл бұрын

I have a 20hp Yam which runs fine but lately started to load up at idle and stalls. I checked the (2) blue wires leading to it and NO voltage whatsoever, even with the ign key depressed. Your vid shows me it's

@bblod4896

I had the same exact issue. The way I start mine is move the red tab to emergency, the engine starts up quickly and then I set it back to normal. So, if the slots just bypass the electric valve, perhaps it's not retracting enough to let the fuel in? I see you posted the video 7 years ago thanks for keeping it up here.

@zx001961 2 жыл бұрын

I have a problem with the Yamaha 115 can't find any help you can run it like 28 mph all day long but if you open it up and start trimming it out in a second or two it will go to missing and have to shut it down for a second restart it and it runs long as you don't go over 28 mph but if you open it on up it does the same thing there has been few times when I first put it in the water I can open it up and run it wide open for a little while and it starts doing that

@tcap7917 3 жыл бұрын

I like that your never in a rush to just put new parts on and hope for the best.

@steveaulick5863

I have been following your blog and have found it very helpful. My yamaha 50hp 2 stroke was over heating and , with your help, I was able to find the problem and fix it. I flushed the engine with muriatic acid and that helped but I ended up pulling the head and cleaning the water jackets manually.

@larryrobinson7492 6 жыл бұрын

Excellent job showing how that system works, Thanks, I never knew they had that system until I was trying to diag a cold start problem for a friend/customer. I found the line off at the engine so that may be all that was wrong but now (thanks to you), I know how to test it for sure.

@jasonkizel5665 2 жыл бұрын

I love you! 98 Yamaha 50 EJRW and the manual doesn’t explain enough for me. You are the Man ! Cheers Mate!

@barryjohns1965 5 жыл бұрын

Great video. I am having an issue with cold starting a Yamaha 115 V4. I am going to look at this prime system for sure. I noticed if I coak each plug in fuel and put them in then the motor starts fine. then it will start like a champ. After it sits a while I have to do the same thing. Runs great after it starts. Anyway. Thank you for the video. I subscribed for sure.

@patricklydon6935 6 жыл бұрын

Nicely done! Thanks for taking the time to explain how this system functions.

@a1marineshop189 6 жыл бұрын

Really enjoyed this video, having carburettor problems with an identical engine, that has been submerged in seawater and then cleaned up. Well done!

@hookempescadosaustin4111 4 жыл бұрын

Another awesome video.....helped me diagnose prime start issue on my 2008 Yamaha 50TLR. Much better than reading the Yamaha bulletin boards! Thx again!

@taatibarao3764 4 жыл бұрын

Man i love your video very much i got the same problem with my yahma 90hp....thanks for taking your time for sharing your skills on marine outboard engines... Cant wait for your next tutorial video...god bless

@jarlebrve6576 8 жыл бұрын

Informative, spot on and honest. You make great videos, illustrations are simple and get's the point across every time.Always looking forward to the next one.