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My 115 outvbaord stalls when i go in reverse, any thoughts?

Customer Question
My 115 outvbaord stalls...

My 115 outvbaord stalls when i go in reverse, any thoughts?

Mechanic's Assistant: I'll do all I can to help. How long have you been dealing with this?

Little bit last season but noticed it for sure this season when I picked up the boat

Mechanic's Assistant: Do you plan on doing the work yourself?

No, just wanted to direct the local tech as to the potential problem

Mechanic's Assistant: Anything else we should know to help you best?

Thats it

Submitted: 2 months ago.Category: Boat
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Answered in 6 minutes by:
5/29/2018
Marine Mechanic: Jason, Marine Mechanic replied 2 months ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 18,238
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Hello my name is ***** ***** am I speaking with? I read what you wrote but do not see any kind of model information. Which engine are you asking about specifically? Who makes it, do you have a model or serial number on it so that I can ID the outboard?

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Customer reply replied 2 months ago
Yamaha F115TLRc boat engine
Marine Mechanic: Jason, Marine Mechanic replied 2 months ago

Got it. How does it do in forward gear? Does the engine make full power under a load while in forward? Will it do 5000K+ Rpms with the boat going max speed?

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Customer reply replied 2 months ago
no issues in forward gear, at all speeds. Just when low speed in reverse and mostly when cold
Marine Mechanic: Jason, Marine Mechanic replied 2 months ago

Hmmm... Is it stalling as soon as you shift it into reverse, or is it stalling when in reverse and giving it some throttle?

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Customer reply replied 2 months ago
stalling when in reverse and giving it a little power. If i goose it, it does not stall. (but the boat crashes into the dock)
Customer reply replied 2 months ago
in reverse and giving it little throttle, fine if i give it a lot
Marine Mechanic: Jason, Marine Mechanic replied 2 months ago

Hmm... You said it happens more when cold. Did you happen to check and see if the engine itself was running cold? If the engine has a stuck open thermostat it will end up running cold and will always end up running rich. This is easy enough to check, just pull the cover off, run the engine for 10 minutes, then touch the head. Have you checked that yet?

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Customer reply replied 2 months ago
nope, i can do that this weekend
Marine Mechanic: Jason, Marine Mechanic replied 2 months ago

Start with that and let me know how you make out.

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Customer reply replied 2 months ago
how does this work, when i log in next week, we will pick it up then?
Marine Mechanic: Jason, Marine Mechanic replied 2 months ago

Yes, just reply right back here when you are ready. Your responses come directly to me and they don't go to anybody else.

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