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I have a 1994 Yamaha 75 hp two stroke. It is fine until it…

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Hey Pearl, I have...

Hey Pearl, I have a 1994 Yamaha 75 hp two stroke. It is fine until it hits 2100 rpm, then coughs and sputters badly. This occurs about 95% of the time and 5% it will take off and run perfectly? Cleaned the carbs and no change ?

Mechanic's Assistant: Can you guesstimate how old your HP is? And just to clarify, what's the exact model?

Its 1994, let me get you the exact model. Just a sec.

Mechanic's Assistant: How long has this been going on? What troubleshooting have you tried?

It's a C75TLRX model. About a month, cleaned the carbs and checked there is fuel flowing into the carbs when it starts miss firing.

Mechanic's Assistant: Anything else you want the Electronics Expert to know before I connect you?

No thats about it. I've ruled out fuel problem, believe it to be electronic since it runs just fine every so often

Submitted: 8 months ago.Category: Boat
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Answered in 18 hours by:
11/12/2017
Marine Mechanic: Jason, Marine Mechanic replied 8 months ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 17,831
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Hello my name is ***** ***** am I speaking with? I read what you wrote. Are you running the engine off of a portable type of fuel tank or is the fuel tank built into the boat? You wrote that you ruled out a fuel problem, did you hook up a fuel pressure gauge and monitor fuel pressure while the engine was misfiring and running poorly? Has the compression been checked yet?

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Marine Mechanic: Jason, Marine Mechanic replied 8 months ago

It looks like you read my response and left without ever replying back. Did you still need/want help with this?

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