Mercury Outboard Compression Test with Cold & Warm Engine | Different Results?? Find out

2002 Mercury Outboard 150 hp Salt water series 2 stroke engine. Pressure test was performed with hot and cold engine using two different tester kits. One from Harbor freight and the other from Pep Boyz.farhad903

[@saadaloogalways6633]

Firstly comment is my beautiful view and very amazing work pin me

[@FKCamVlogs]

Done as requested 🙏

[@Blukiz_pr]

Awesome video! Thank you ! 🙏🏽

[@bradleymacblane5561]

I've been going MAD after having my motor rebuilt. It started running like crap, so I used a harbor freight pressure tester and also got 90 psi. I had blindly ignored the test and am pretty sure it's carburetor related now, but thank you for this video!!! The same thing must be happening to me and i can write off my worries as HFT junk!!!

[@FKCamVlogs]

Sometimes its the inline filter that needs tightning, it sucks air and you feel its the carb. Check that first and yes HFT gauges nothing but crap. Good luck Captain !

[@bradleymacblane5561]

@@FKCamVlogs oh I never thought to check that. But right now, it's running rich as I get unburnt fuel in the exhaust water (I haven't put in lake because of this) and a rough idle. I'm trying to think if there's a bassackwards reason air on the fuel inlet would contribute to my issues.

[@JorgeArmandoUrdanetaAlvarado]

Excelente Video..

[@hapaboy65m87]

great video, i had same results on my 200 efi and harbor freight gauge, going to return the harbor freight junk, thanks

[@FKCamVlogs]

Thanks for feedback!!

[@jesus3901]

appreciate your video.Thank you.

[@FKCamVlogs]

Glad it was helpful!

[@shafeekhan3903]

great job

[@FKCamVlogs]

Thank you !

[@rosymakeup5442]

Hi friend, wow great work👌👍

[@FKCamVlogs]

Thank you! Cheers!

[@channels-media8990]

Great job done my dear friend 👍☺️

[@FKCamVlogs]

Thank you!

[@channels-media8990]

You're welcome my dear friend ☺️

[@CocinandoYFormateando]

Great job my friend, 👍11

[@FKCamVlogs]

Thank you friend!

[@knowledgeandlogics7042]

Good job dear

[@FKCamVlogs]

Thank you so much

[@hudsonbridges5710]

I have the same model engine but its a 200hp, so this was very helpful and well-made. Any chance you know where I can get replacement head bolts for this motor?

[@FKCamVlogs]

Try Crowley's marine, they have diagrams, and part numbers.

[@BritishPakFamily]

lk 5 😎 wow great job dear congratulations for mono

[@FKCamVlogs]

Thank you so much

[@alistairshanks5099]

I am a mechanic and compression tests should always be done on a warm engine if possible and the throttle should always be wide open and the cranking should be the same for each cylinder. The main thing you are looking for is an even spread of results. The gauge difference is not good but they were both even spreads. You can have gauges calibrated but at the price, you paid it would not be worth it.

[@FKCamVlogs]

Thank you for a great input. Much appreciated !!

[@Nass1986]

Way to go healthy engine

[@FKCamVlogs]

Thank you !!

[@freakazoid111]

I have a 15hp 2 stroke Mercury. Both chambers are at 75psi. Is this ok? Test was done wot but the choke was in.

[@FKCamVlogs]

Depends on the year, if its older motor then you are in range.

[@elliottstanaway9903]

Super nice video . I would think of something I hope you would do then bam ya did it multiple times👌

[@FKCamVlogs]

Appreciate the feedback, keeps me going!!

[@billholt4326]

13 - 16ths👍

[@FKCamVlogs]

Thank you !!

[@khudztv1625]

When it comes to boat....you're the one

[@FKCamVlogs]

Haha Thanks friend!

[@coastalcleaningandmaintena2884]

Wanna see 120 125

[@vladimirstrelovich7016]

Привет интересный обзор Огромный лайк 👍✊

[@FKCamVlogs]

Thank you !!

[@chunlimon7862]

I have the same engine, do you have the spark plug gap info? Thx

[@FKCamVlogs]

Its .040" or 1 mm for all 2 stroke Mercury engines from 2001 to 2006

[@chunlimon7862]

@@FKCamVlogs thanks😊😊😊😊👍

[@mrsensable]

If motor has aluminum heads test cold!! Removing plugs when hot can damage threads!! Ask any good mechanic!

[@FKCamVlogs]

Captain you are absolutely right. Thanks for sharing. I did hot test based on some comments from viewers to show its not much difference between hot and cold test.

[@mrsensable]

@@FKCamVlogs ok . I understand. I gave done both aswell. Same numbers. Was worried the threads will pull out when hot though. LOL

[@coastalcleaningandmaintena2884]

Pep boys im from canada do they just sell tools or do they do repairs as well. Cause it looks like shady business going on there. It would even run if it was 90

[@coastalcleaningandmaintena2884]

Wide open throttle is for 4 strokes my man.

[@acurarl9929]

I’m 180psi +~4psi cold

[@FKCamVlogs]

Thanks for sharing +- 4 psi not bad at all

[@Nonplused]

Is it a 4-stroke? 4-strokes run 180-200 or there abouts. I've never heard of a 2-stroke over 120ish.

[@GoldenCroc]

@@Nonplused Outboard engines not so much, at least not older ones. Other two stroke engines can be above 160 easily, and more than that.

[@DustinKeating-yk3vq]

Harbor freight compression gauge is trash i will never use one

[@coastalcleaningandmaintena2884]

Theres nothing wrong with your guage

[@philbarrows424]

So we have proved Harbor Freight calibration tools are the worst

[@FKCamVlogs]

Yes Indeed !!

[@ricksnowden8408]

115 to 120 on these motors is great. Harbor freight garbage.

[@FKCamVlogs]

Thanks for your input and in complete agreement!

[@coastalcleaningandmaintena2884]

Take it back what a joke

[@FKCamVlogs]

Agreed !

[@coastalcleaningandmaintena2884]

Barely alive my friend. 90 is terrible

[@Blukiz_pr]

What is the desired compression?

[@dereksuperstrong1210]

How do you know the harbor freight one wasn’t giving you the right rating and that Pep Boys was not giving you the wrong rating just because the pet boy one was giving you a stronger rating does not mean it was more accurate

[@FKCamVlogs]

Derek, thats a good question. I tested with Snap-On as well and rating was almost same as tool from Pep Boys.

[@dereksuperstrong1210]

If your hose wasn’t so long you would not have to spend it over so many times to get the 90 pounds shorten your hose I hear your battery starting to lose towards the end of your test