• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.
  • ALL iboats Forum Members and Guests:
    To show our appreciation for your participation in the Forums, we're offering an exclusive Forums-only discount good for an additional 5% off your iboats.com order for a limited time.
    To redeem, simply call our Customer Service Team at 800-914-1123 (Open M-F, 9am - 8pm Eastern Time) and mention the Forums 5% off discount. Offer excludes engines, trolling motors, and electronics.


Announcement Module

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old threads or hijack existing threads. Old threads of a technical nature are like a library book, Please do not write in them.

2. Old threads should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís thread (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new thread of your own.

4. If you have a question for the original poster (OP) and the thread is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old thread.

5. By starting your own thread, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís thread. And those answers will be specific to your particular issue.

6. Please do not post to threads that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any thread that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old thread.

7. Posting at the end of any thread is considered to be hijacking the original posters thread which in turn subjects the thread to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive thread asking you not to reply to old threads. The Red banner will read: Please note this thread has been inactive for 90 days. For the best results, please start a new thread.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
See more
See less

85 Mercury 40 hp Reed Valve Problem?

Page Title Module
Move Remove Collapse
Conversation Detail Module
  • Filter
  • Time
  • Show
Clear All
new posts

  • 85 Mercury 40 hp Reed Valve Problem?

    Looking to buy another motor on the cheap. I was told it needed reed valves replaced. The motor (and boat) are 1 1/2 hours away from me so I've been in no hurry. Somebody my brother works with. Anyway was told the motor does run on one cylinder.Big question!!! From the minimal amount of info I gave, can you tell if that would be a likely issue? And if so, how much would repairs cost if I do them correctly the first time? thanksBilly Bob

  • #2
    Re: 85 Mercury 40 hp Reed Valve Problem?

    A 40 on one cylinder will not run like a 20. Funny huh?A reed if broken can sometimes reek havack. Get caught up in the exhaust port and score things up badly. Then again sometimes maybe no noticeable damage other than the reed might be observed. Might be good to pick it up for it's value as spare lower unit, carb, ignition components, but as a usable core you should be suspect. Reed valves are not an easy change on some of the old Mercs.


    • #3
      Re: 85 Mercury 40 hp Reed Valve Problem?

      If it needs reed valves because a petal broke off and got swallowed........JUNK............or one helluva lucky chance nothing internally got damaged......BUT then again, somebody musta been runnig it on one cylinder to know....... Hmmm? (jus' maken' more metal)


      • #4
        Re: 85 Mercury 40 hp Reed Valve Problem?

        Hey GuysThank you. Might buy it for parts and if it is ok, then so much the better. The way you describe it, this guy may not know what he is talking about. If he was running the motor (getting less than 20hp, funny) surely he would have noticed the scraping, clanking, scoring, etc types sound/s coming from the motor. Now let's begin to be unrealistic here: I take the motor home and a spark plug wire has come loose and the guy didn't notice it. POOF!! Wake up. You've been dreaming. thank you againBilly Bob