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renelson replied to the thread 2007 40hp Merc carb and compression questions.

I should’ve probably stated that I’m trying to sell the motor and I wanted to make sure the I’m not screwing anyone over with the...

Mar 4, 2025
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renelson replied to the thread 2007 40hp Merc carb and compression questions.

Good point. Thanks to everyone for their help.

Mar 4, 2025
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renelson reacted to racerone's post in the thread 2007 40hp Merc carb and compression questions with Like.

It clearly states " minimum " compression is 87 PSI

Mar 4, 2025
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renelson replied to the thread 2007 40hp Merc carb and compression questions.

Your assumption is correct 😂 It just seems strange that I am reading much closer to the 120 mark than the 87 mark, and I’m just trying...

Mar 3, 2025
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renelson replied to the thread 2007 40hp Merc carb and compression questions.

Thanks a bunch. I wonder if my motor is the equivalent to the 40BTR (120psi), rather than the 40BMH? Did your research of my serial...

Mar 3, 2025
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renelson reacted to boscoe99's post in the thread 2007 40hp Merc carb and compression questions with Like.

Your model motor has an automatic decompression device so that it can be more easily pull started. This throws off the compression test...

Mar 3, 2025
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renelson reacted to boscoe99's post in the thread 2007 40hp Merc carb and compression questions with Like.

Yamaha made a number of motors for the Mariner brand and the Mercury brand for many years. All the way up to the Mercury 225 HP four...

Mar 3, 2025
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renelson replied to the thread 2007 40hp Merc carb and compression questions.

Wow, so this 4-stroke mercury was manufactured by Yamaha? I had no idea they did that. Are you 100% sure on that compression? Because...

Mar 3, 2025
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renelson reacted to boscoe99's post in the thread 2007 40hp Merc carb and compression questions with Like.

Looks to be a Yamaha power plant. Yamaha data for a 2007 model year F40 indicates the minimum compression pressure as being 87 psi...

Mar 3, 2025
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renelson reacted to boscoe99's post in the thread 2007 40hp Merc carb and compression questions with Like.

What is the engine serial number? How was the test performed? Motor should have been hot. Throttle wide open. Known good gauge. Battery...

Mar 2, 2025
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renelson replied to the thread 2007 40hp Merc carb and compression questions.

Serial number is 1C050911. I heated it up first, removed all plugs, WOT, then pulled 8 or 9 times until it quit going up (pull start)...

Mar 2, 2025
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renelson replied to the thread 2007 40hp Merc carb and compression questions.

I hooked my comp tester gauge to my air compressor at 150psi and it reads about 135psi so it may be off just a bit, but not a lot. Using...

Mar 1, 2025
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renelson replied to the thread 2007 40hp Merc carb and compression questions.

Would someone mind checking a service manual for that carbureted motor? I would sure appreciate it.

Mar 1, 2025
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renelson replied to the thread 2007 40hp Merc carb and compression questions.

Well that’s not good…

Feb 28, 2025
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renelson replied to the thread 2007 40hp Merc carb and compression questions.

Thanks. I hadn’t looked into it. I can rebuild a carb but going into the cylinder head is above my pay grade. I thought that within 15%...

Feb 28, 2025

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