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

Announcement

Collapse

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.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

RPM issue with cheap brand Hangkai

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • RPM issue with cheap brand Hangkai

    Good day, I was on a limited budget, and decided to buy a cheap 6 hp Hangkai motor from China for my 14 foot inflatable kaboat. Immediately I noticed, that I wasn't getting the speed I was expecting (about 10 to 12 mph.) I was doing about 5 mph instead. I have been troubleshooting this problem for months, and I know it is capable of more power, because a couple outings I had a nice burst of speed for a while until I turned off the motor for a bit, went on a plane. Now, I have no idea why this speed happened. Here is what I have tried; took apart the carb multiple times and sprayed with carb cleaner, checked float, checked needle valves, checked fuel lines, replaced spark plug, played around with the mixture screw to no success, and checked fuel pump. I measured the rpms, and maxes out at 3400 when it should do 5500, which is can idle at. When the motor is in a test can, the motor seems to go in and out of of a lot of rpms, even seems like it becomes more powerful when the cover is off. But it seems to go back to the same old 3400 or lower when the motor is under load on my boat. I am at a loss here, and no mechanic wants to look at my motor because it is an off-brand. Any help would be appreciated, thank you.

  • #2
    Is your motor a 2 cylinder, if it is look for spark on both cylinders.

    Comment


    • #3
      Originally posted by flyingscott View Post
      Is your motor a 2 cylinder, if it is look for spark on both cylinders.
      Yes it is 2 stroke, thanks, I'll check the spark.

      Comment


      • #4
        Originally posted by mangoboxer View Post
        Yes it is 2 stroke, thanks, I'll check the spark.
        I meant 2 cylinders not 2 strk.

        Comment


        • #5
          If it in fact runs better with the upper cowling off then you may have an exhaust leak or a restriction in the air intake of the cowling....just a thought..

          Comment


          • #6
            Originally posted by flyingscott View Post
            I meant 2 cylinders not 2 strk.
            It is a 1 cylinder I think, and a spark tester will arrive tomorrow.

            Comment


            • #7
              Originally posted by robert graham View Post
              If it in fact runs better with the upper cowling off then you may have an exhaust leak or a restriction in the air intake of the cowling....just a thought..
              If it is water cooled is there still an air intake? Where would an exhaust leak take place? Thanks

              Comment


              • #8
                One cylinder, two-stroke motor. I wouldn't expect the problem to be spark related.

                Maybe the throttle linkage binding somewhere?

                Comment


                • #9
                  Originally posted by tomhath View Post
                  One cylinder, two-stroke motor. I wouldn't expect the problem to be spark related.

                  Maybe the throttle linkage binding somewhere?
                  I just checked with the spark tester, it is consistent with an orange spark. Not sure about a binding, is the throttle linkage the wire that is connected to the throttle which moves up and down as I give it throttle?

                  Comment


                  • #10
                    Originally posted by mangoboxer View Post
                    If it is water cooled is there still an air intake? Where would an exhaust leak take place? Thanks
                    Try running the motor with the cowling off....if it's an exhaust leak or restricted air inlet then it'll run better with the cowling off....

                    Comment


                    • #11
                      Originally posted by robert graham View Post
                      Try running the motor with the cowling off....if it's an exhaust leak or restricted air inlet then it'll run better with the cowling off....
                      When I run it in a test tank and the cowling off, it seems to sometimes get a boost of rpms then goes down again. It does it in spurts. I don't know how it would have a clogged exhaust when it is practically a new motor. When you say air inlet, are you talking about on the side of the carb? Because there is no inlet on the cowling.

                      Comment


                      • #12
                        Have a fan blowing across it while in the test tank to get the exhaust away so it doesn`t breathe it`s own fumes.

                        Comment


                        • #13
                          Does it have a mixture screw on the front of the motor?

                          Comment


                          • #14
                            Originally posted by funk6294 View Post
                            Does it have a mixture screw on the front of the motor?
                            It has a mix screw on the carb on the side closer to the middle of the motor. Heres a picture from online.

                            Comment


                            • #15
                              Sign up today
                              Does the motor sound like its blubbering when it won't hit rpm, or is it bogging?

                              Comment

                              Working...
                              X