2-Stroke Yamaha dying after 2 minutes!

[IainK]

Hi Guys,
Apologies to Ken if he replies before someone else does: frustration here. We have a wee RIB as a Rowing Club, club safety boat on loan, with a 2 Stroke 25 HP Yamaha about 1998(?). That is dying after around 2 minutes running at 17 knots.Left for a few minutes it goes off great only to repeat it. Changed fuel lines, clean carbs, jets etc running great otherwise. Any ideas please? Thanks in advance Iain

[jeffstevens763@g]

fuel pump?

[KarlTX]

Fuel pump or its still carb issue. My 8hp Yammi behaved very similar when I first got it. It would sputter and then die after running WOT for couple of minutes. I didn't even bother cleaning the carb, just got brand new unit. It has ran flawlessly ever since...

[alamos]

Is it overheating? - I had an engine that did that & found the water intake was clogged with marine creatures & clag, cleaned them & it was fine - My son also had a similar problem but he'd forgotten to open the air vent on the fuel tank!

[Locozodiac]

A fuel pump nor carb related issue wil give 2 full minutes of autonomy, if motor misses, let it cool, works fine to fail again and so on, seems an electrical componet heating shorting erratically, the bummer is which one ? Will need to troubleshoot each electrical components to rule out wich one is the direct culprit. Good Luck !!

Happy Boating

[Nasher]

Sounds like a blocked, or forgotten to be opened, fuel tank vent to me.

Nasher

[Locozodiac]

Originally Posted by Nasher

Sounds like a blocked, or forgotten to be opened, fuel tank vent to me. Nasher

Will agreed on that one, but won't be possible to restart the motor again for a second, third time in a row once has repetitively died without priming the fuel bulb firm...

Happy Boating

[IainK]

Thanks guys, After a full carb removal, strip down and through clean with new spark plugs: refitted and off it went like a new engine! As Ken advised do the simple things first! Happy ribbing when the good weather returns. Iain