Yamaha 4 Stroke Outboard Engine Carb Rebuild Series [3] Component Testing and Repair

Onto part three, we begin with the repair of the brass fitting that was found to be broken off the carb 4 in part two. A very small amount of JB weld is used on the prepared surface, as little as possible on both pieces, and tapped in with a small nylon mallet. With that carb now set to dry the next carb, carb 3 is going to be disassembled, this one containing a prime start plunger will mean there will be an extra component to clean and test.
The carb cleaning itself was about identical except for the extra provisions on the carb and bowl. This carb was found not to be terribly dirty, just a little. The main jet size recorded. Float Height was good. Reassembly was uneventful.
YAMAHA CARBURETOR REPAIR KIT MERCURY 40 45 50 HP 4 STROKE 62Y-W0093-11-00
amzn.to/3mhxuOH
NON OEM version
amzn.to/41i3vVL
J-B Weld 8265S Original Cold-Weld Steel Reinforced Epoxy
amzn.to/41euMbr
The valve was disassembled and inspected before cleaning. A resistance if 31.3 ohms is recorded across the leads. The cold value for the valve is 20mm. The results after 5 minutes shows the value is 25mm. Which is within specification. The valve is then reassembled and then assembled to the carb with new gaskets. It uses gasket 62Y-14398-30
Carb two was next, having no prime start valve it was just like carb four except it was dirty, the float needle was bad and the float was 4mm too low. The jet size was recorded and we moved onto carb one which has a prime start valve like carb three. This carb had nothing terrible to report. The valve values were a bit off from carb one but within specification.
CARB 3 VALVE 31.3Ohms 20mm - 25mm
CARB 1 VALVE 19.9Ohms 22mm - 27mm
Once carb one was completed. It was found that the main jets for 1 and 3 were swapped, so they were swapped back
Result
1 - 124 / 39
2 - 126 / 39
3 - 116 / 39
4 - 114 / 39
Next was the accelerator pump with the broken hose which was completely disassembled and dirty inside. so it was cleaned out completely and the hose was found to have a reducer in it which was removed, added into the replacement hose 64J-14349-50. Reassembled after repair the accelerator pump awaits the assembly of all parts back together in the next chapter.
#yamahaoutboards #yamahaoutboards

[@reddragonangler6136]

My friend and I agree that the tutorial video's you've posted regarding the Yamaha outboard motor are the best we've ever seen. The description and content are 2nd to none. We did a full carburettor rebuild last year withy all new gaskets and O-rings. This year though before we took it out to see gave it a once over and found a leak coming from either the 3rd or 4th carburettor, after watching your videos we finally solved today but during testing the throttle cable snapped, so that's our next job before we can get out to do some sea fishing on the Gower Coast, South Wales, UK. Will you be doing a final video of tuning the outboard because that's one thing we have no idea how to do? Thank you

[@delorean1]

Hello and thank you for the kind words, I believe the final video in the series will be posted this weekend.

[@Kosmos-77-]

Nice video! Why did you swap the jets? Was there different sizes…? If you buy a kit there is only one size included i guess. Or have i got it wrong?

[@billbarton7891]

how can gas leak from top plate, gaskets are fine. is part of top carb air only and other is gas?

[@danieltravis2850]

Where did you get the manual you're using, I bought one for my F80TLRA and it's not what I'm used to, very little step by step information. I'm assuming my engines problems lie in the pilot circuit because it runs great when I'm past 1/4 throttle but idles poorly. Thanks for the videos, well done.

[@delorean1]

The factory manuals are not awesome.... little more than explosion diagrams and maybe some specific activities mentioned.

[@trayevans9381]

man thanks for braking it down on how heaters work. my 03 80f is got a slight mis at idle. time for kits

[@Raina907]

When looking at carb 3 there is a plastic Fuel T-Fitting. Any idea where I could find replacements for these????They're on Carb 1 and Carb 3. My carb 3 T broke! Thanks in advance. Hoping for some direction.

[@saddamsobig2348]

Can you send me catalog for Yamaha F40 A

[@delorean1]

google.

[@user-sf6lp9vt5g]

You need to show is overhaul 4 stroke Yamaha 20hp

[@delorean1]

Sorry I don’t have one.