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Honda BF50 valve clearances?

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  • Honda BF50 valve clearances?

    Could someone provide to me the valve clearance settings for the adjustment of the intake and exhaust valves? It would be for an 02 Honda BF50 model, but all years should be the same.Thanks!


  • #2
    Re: Honda BF50 valve clearances?

    Seloc says for the BF50A it's:Intake valveinches : 0.002-0.006 mm: 0.06-0.14Exhaustinches: 0.004-0.007mm: 0.11-0.19I'd want a manual if I were doing this.

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    • #3
      Re: Honda BF50 valve clearances?

      Thanks again. I assume you're the same person from the MacGregor board. How's the outboard fix coming along?

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      • #4
        Re: Honda BF50 valve clearances?

        Aye, it's me. Just picked up replacement parts today so tonite's carb rebuild nite.Honda parts are carefully rationed.Hopefully I'll be able to post some photos & part numbers after it's running again.

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        • #5
          Re: Honda BF50 valve clearances?

          Seloc says for the BF50A it's:Intake valveinches : 0.002-0.006 mm: 0.06-0.14Exhaustinches: 0.004-0.007mm: 0.11-0.19
          Wow! That's a big spread. My Honda Marine repair/maintenance manuel issued by Honda Motor Company LTD. says;Valve Clearance cold- Intake 0.13-0.17mm (0.005-0.007 in.)Exaust 0.21-0.25mm (0.008-0.010 in.)No wonder all those hard starts and rough warm-ups in cold weather if people are setting intakes at 0.002.It's hard to get a grip on a decent tune-up if the max. clearance spec. from an aftermarket source on the exaust valve is less than the minimum spec. from the factory's source.I'm highly meticulous at adjusting mine at the minimum specs I've given. I don't hear any valve train noise, it starts, idles and performs like a fuel injected motor. Even on the coldest morning.

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          • #6
            Re: Honda BF50 valve clearances?

            I actually just found the valve lash specs on a label attached to a inconspicuous spot on my outboard that matches Skinnywater's numbers. I appreciate all of the feedback anyhow. I'll probably go for 0.13mm intake and 0.21mm exhaust to play it safe.

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            • #7
              Re: Honda BF50 valve clearances?

              I must've bought the specially-priced misprinted version.

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              • #8
                Re: Honda BF50 valve clearances?

                While your there cbhinkel adjust the belt tentioner to specs. It'll cut down on some of the chattering noise.BTW, if it's your first time with the valve cover off, isn't it satisfying to see the way Honda polishes those rocker arms?

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                • #9
                  Re: Honda BF50 valve clearances?

                  Skinnywater, since I continue to be a cheapskate and don't plop the $150 down at my local Honda Marine dealer for the service manual, the specs for the belt tensioner are ????Also, I agree that Honda quality never dis-appoints for all of their products.

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                  • #10
                    Re: Honda BF50 valve clearances?

                    Remove the rubber cap from the center of the tentioner pulley. Loosen the bolt that was under that cap only enough to allow the tentioner assembly to pivot freely. Rotate the motor by hand slowly and evenly in direction of rotation one full revolution. Tighten bolt and reinstall cap.The spec is determined by the tentioner spring.The Shop Manuel part# 61ZV300 and suppliment to itpart# 61ZV300Y was only $45 incl. shipping and tax 3 years ago. You'll need a 3 ring binder of your own.However, I don't mind scanning a page or two or helping out with it here.

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                    • #11
                      Re: Honda BF50 valve clearances?

                      Thanks again! My local Honda Marine dealer who will remain nameless quoted me $100 and change plus tax for the service manual. Their Honda outboard prices are well above average as well, which is consistent with their parts pricing. I wouldn't be surprised if they are one of those dealers who applies the 40% plus margin across the board.....I'll try ********** again for the BF40/50 service manual since I had to pull the cylinder head yesterday on my BF50 to do what I needed to it. They have been moving their operations and their service has been slow recently.

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                      • #12
                        Re: Honda BF50 valve clearances?

                        I had to pull the cylinder head yesterday on my BF50 to do what I needed to it.
                        Mine's a 2002 also.Hmmm, ya mind sharing with us why you're having to do this?

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                        • #13
                          Re: Honda BF50 valve clearances?

                          Originally posted by Skinnywater: Remove the rubber cap from the center of the tentioner pulley. Loosen the bolt that was under that cap only enough to allow the tentioner assembly to pivot freely. Rotate the motor by hand slowly and evenly in direction of rotation one full revolution. Tighten bolt and reinstall cap.The spec is determined by the tentioner spring.The Shop Manuel part# 61ZV300 and suppliment to itpart# 61ZV300Y was only $45 incl. shipping and tax 3 years ago. You'll need a 3 ring binder of your own.However, I don't mind scanning a page or two or helping out with it here.

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                          • #14
                            Re: Honda BF50 valve clearances?

                            HI there SWcan you please tell me from where you bought the Manuals? do you think i could order tehm over the net?my BF50 (2001) is giving me some trouble when on gear. if i exceed 2500rpm slowly, the engine stalls. However, if i hit the accellerator fast, the engine goes OK. looks like it's teh carbs and i would like to clean them. The Seloc manual has not been recommended. can you please help? i live in Malta (in the middle of the Mediterranean sea and unfortunately our Honda dealer is not the most efficient, apart from not being the cheapest!!). thanks

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                            • #15
                              Re: Honda BF50 valve clearances?

                              Hello SilvioMifsud.I'm not real clear on how all this sets with our host iboats. I might be violating iboat's policy or at least pushing the envolope. Or I may have their blessings under the circumstances.I certainly encourage a moderator/administrator to weigh-in.I understand your problem with the Seloc manuel for Honda. Seloc's information when not scarce and vaugue it'll be reliably incorrect.I bought my manuel from my selling dealer here in North Central California when I bought my boat.Since then they've proven to be so lacking in customer service and ability that I couldn't recommend them.Feel free to email me direct bachelor@stormnet.com and I'll accomodate you the best I can.

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