Welcome Guest - Sign Up today
Welcome Guest - Sign Up today
Store Links Mobile - Shop Now



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 topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

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

3. Do not take over someone elseís topic (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 topic of your own.

4. If you have a question for the original poster (OP) and the topic 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 topic.

5. By starting your own topic, 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 topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic 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 topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic 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 topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

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

Exhaust Backfiring Question

  • Filter
  • Time
  • Show
Clear All
new posts

  • Exhaust Backfiring Question

    I bought a Johnson 175hp maybe early to mid 90's. It won't start, 90psi all cylinders. Sprayed starter fluid in the carbs after cleaning. It wouldn't start, just loud backfire from the prop. I turned the flywheel by hand and when the 1 and 2 piston was all the way up the flywheel tdc was significantly past the pointer (about 2-3 inches past) so could I have a sheared key

  • #2
    That would be the first thing to check.--And what does it show with only # 1 at TDC ??-----------Model # is ??


    • #3
      didn't check the model number but the flywheel has markings for #1 and #2...Both were same same 2-3 inches past the marks when pistons came all the way up feeling with a philips screwdriver


      • #4
        Check the flywheel key.


        • #5
          The fly key was gone so today I installed a new correct key, down torqued 110psi, checked tdc again, all was lined up. Sprayed a little starter fluid and she's still loud backfiring from the prop area. The plug wires and coil wires are next to each plug so am I still missing something. model # 175tl79r


          • #6


            • #7
              Sign up today
              Answered in detail another forum..... wrong torque! Must be torqued (V6) to 145 foot pounds.
              Our Questions Require Answers... If You Refuse To Answer Our Questions... How Can We Answer Yours?