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Carb issues?

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  • #21
    Turn the idle up as far as you can, and leave it.
    It’s running, so the timing is fine. I think? Others may have better input. The ECU handles all the timing.
    It’s an early 1600, so it’s just a wild guess regarding oil pressure. They suffer from broken oil pump drive gear shafts, which pretty much ends them running well. Generally on one cylinder because of the hydraulic lifters. If it is that, don’t panic. Practically all we’ve seen, have been fine when the newer style oil pump drive gear is installed.
    The cylinders have a Nikasil coating, that makes them last forever. It’s doubtful anybody’s done anything to it. Hopefully. Most are amazed how good they look, if they tear the motor down that far.

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    • #22
      Little late to the party, but a couple thoughts in no particular order...

      Turn the idle up!!!

      Also... If you're oil pressure is low, due to low idle, a lifter may not be pumping up...

      Fix your accelerator pump!

      If that doesn't work...

      Did you check the jets to insure they're Mikuni jets with the square in a square logo stamped in them? Dynojet also makes jets for these carbs and the sizes are different.

      Click image for larger version  Name:	Mikuni-Main-Jet-VM1122.jpg Views:	1 Size:	166.6 KB ID:	33592Click image for larger versionName:	file.php?id=157&sid=9c07cca6a1d680c3e5bf8bc1a66c7433.pngViews:	1Size:	9.8 KBID:	33593Click image for larger versionName:	file.php?id=158&sid=9c07cca6a1d680c3e5bf8bc1a66c7433.pngViews:	2Size:	4.7 KBID:	33594

      A vacuum cap is only a temporary solution, the heat from the jugs will cause it to crack over time... ask me how I know... Solder the brass nipple closed and be done with it..

      As far as the possible rebuild... To the best of my knowledge... with Nikasil you can't machine out the cylinders like you can with cast iron. If you do you remove the Nikasil and you end up with bare aluminum. [not good] So with Nikasil motors usually you have to sleeve them after machining / boring; which should be obvious.

      Make sure your plug wires are going to the right cylinder, and if they are, check your plug gaps to be safe. After that, assuming they're already going to the right plug, you may even want to try removing the wires one at a time to see if there's a difference... If not, you may have a bad coil or some other electrical issue.

      Check the valve stems inside the intake manifold. The older motors were susceptible to Sticky Valve Syndrome [SVS] from build up on the stems. Check the tech articles for details but you can easily check for SVS by holding a piece of tissue paper over the end of the pipes... if it gets sucked in every so often, you have SVS.

      That's all the comes to mind at the moment.

      Best of luck.

      Doc_V
      Last edited by Doc_V; 08-13-2018, 01:19 AM.

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      • #23
        you said one cylinder is hot and one cold, ??? with a single carrb bike, they should be close, one may not be firing. also, check to see if the throttle cables coming from carb are not worn thru and grounding out the positive lead to the right side coil. wrap it with effective measures. also, the BS chinese vacuum plug on the brass nipple you put on will probably fail from the heat of an air colled engine, its best to use a good piece of fuel injection line with bolt and clamps to block this off, , also, a good backfire may blow the BS plug off.
        also, , may not be carb at all-
        you could have bad coil. make sure all 4 plug wires are connected, I burnt a coil doing what youre doing , troubleshooting, with one plug wire disconnected. itI will show spark on spark test with plug laying on the engine, but wont work when installed. there is a diagnostic check for coils using VOM meter. i have an extra, but i live in FL.

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        • #24
          You never said if you have oil pressure?Lack of oil pressure could cause a collapsed lifter and/or destroy a cam lobe or dish out a lifter bottom. You are dealing with a 2001 that is known for having a defective weak oil pump drive gear that will snap and quit pumping oil

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          • #25

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            • #26
              there is a way to see if your oil pump has allegedly been fixed under recall.....some dealers will lie.....

              Comment


              • roadiemort
                roadiemort commented
                Editing a comment
                Oil pump gear is not part of the recall unless you tell them to change it then you pay for the part and they will put it in for no extra labor.

            • #27
              All right, I am back again. Don't have a final answer yet, but hopefully getting closer. After much research and discussion I came to the conclusion that I might have a burned or bent intake valve. I removed the front head and turned it over on a bench and filled the combustion chamber with gas. Rocker arms were removed of course so the springs should have been holding the valves closed as tight as possible. Sure enough, the gas leaked out and only through the intake port. Went and bought a spring compressor and valve lapping materials and tore down the head. The valves did not LOOK bad but checking with layout fluid did reveal a gap in the sealing surface on one valve. I check for bent by rolling them across a flat surface(I didn't have a better way to do that here) and they seemed to be straight. Since I had them all out, I lapped them all to within spec. I am going to try and start it again today. I will let you guys know what happens.

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              • #28
                ignore ME WRONG THREAD

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                • #29
                  Well, it has only been a year, but I finally got it running! I ended up lapping all of the valves and when I was able to get everything back together it ran better, but not great. I at least had it running enough to find out about the oil pump gear. I cracked the banjo bolts on the oil line and sure enough, no oil coming out. Shut it off immediately and went and ordered a new oil pump gear. Got it in this morning, and after buttoning everything up I hit the starter and it came to life! Now I can go to work putting this thing back together. I want to thank all of the people here that have given me time! I appreciate it!
                   

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                  • #30
                    Sounds pretty good Wildkarp! Congrats! JC

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                    • #31
                      There is also a filter in the carb where the fuel line connects. Have you cleaned/removed it?

                      Comment

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