06 Ne5 Engine Sounds Like It Is Falling Apart At Full Rev

Discussion in 'Whizzer Motorized Bicycles' started by POLQWA, Apr 8, 2008.

  1. POLQWA

    POLQWA New Member

    This bike seems to idle fine. When I take it a couple miles down the road it sounds like it is going to fly apart at full rev. It idles fine and starts fine. Any ideas before I jump into this? thanks :confused:
     

  2. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Hi,
    What is full revs?
    Which ratio clutch are you using?
    What weight oil are you using?
    How many miles on bike?

    Check the lifter clearance. The factory setting on the NE motor is .009". The factory setting on the WC-1 is .012". When I use mushroom lifters, I set the intake .006", and the exhaust .008".
    Have fun
    Whizzer OuterBanks,
    Quenton
     
  3. bill green

    bill green Member

    Hi let me add to quentons list.Have found loose hardware on motor mounts and loose hardware on exaust please check allen set screw at head pipe under cover at head connection, comes loose often. Other than these two things Quenton has it covered.Hope this helps Bill Green
     
  4. RdKryton

    RdKryton Active Member

    POLQWA I hope Quenton's and Bill's info help you. Please come to the introduction forum and say hello. We like to get to know a little bit about the users here so an introduction would be nice.

    Jim
     
    Last edited: Apr 8, 2008
  5. POLQWA

    POLQWA New Member

    Loose Motor

    The full rev would be going about 30-35 MPH.
    This is all stock on a NE5 motor except you planed the head and ported it Quenton.
    I will check the valves again.. I hope it is that simple. I believe it is too noisy for that problem but will check it for sure.
    I have 900 miles on this engine.
    Thanks for all the input and is there any other ideas?
    intro: I am from central Illinios, 51years old
     
  6. POLQWA

    POLQWA New Member

    I forgot to tell you guys I am useing 40 weight castrol oil. And yes it was full up to the mark.
     
  7. POLQWA

    POLQWA New Member

    Checked Clearance

    I finally had time to check valve clearance and they both checked right on... I started it up and did some more intense checking. And when I rev this up I here a loud thump noise in the upperend. Could this be a rod bearing!! Am I correct to say you have to replace the crank and piston assembly on this motor as a unit?
     
  8. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Hi POLQWA, You are correct the crankshft & rod is one assembly [piston is separate item]. I have never seen a crankshaft go bad on the new edition Whizzers. I have even rebuilt motors that were run completly out of oil, and the crankshaft was fine. The only issues I have ever run across concerning the crankshaft was one that had "twisted" [do not use a power driven impact wrench when tighteneing the flywheel bolt], and the motors that had run out of oil needed the bushing at the top of the rod re-surfaced [where the wrist pin attaches].
    Another area that could be causing the problem could be the sparkplug, and or the valves hitting the inside of the head. I haven't run across the sparkplug problem, but I heard some of the earlier NE heads were made slightly different, but usually hit the sparkplug and closed the gap [wouldn't start].
    If you have the copper head gasket [re-usable], I would suggest you remove the head and look at the combustion chamber to make sure nothing is hitting. I once worked on a motor that the wrist pin clips weren't installed on one side, but it didn't make a "thumping sound", just started to smoke [ruined the cylinder wall]. You might also check the piston for possible cracks [never had this happen] and take a good look at the wrist pin for extreme wear. You might also take a look at the alternator coils under the flywheel to make sure the bolts holding it in place haven't loosened and allow the flywheel to contact the coils at higher RPMs. I am sorry I can't be of more help, but just never had any similar problems with the Whizzer motor..............
    Have fun,
    Quenton
     
  9. POLQWA

    POLQWA New Member

    Thanks Quenton for all the help. I will check all of your possibilities and report my findings.
     
  10. bill green

    bill green Member

    Hi Polqwa Need up date have you found any thing yet.. Bill Green
     
  11. POLQWA

    POLQWA New Member

    Update

    I took head off and everything looked fine. I then checked everything Quenton said outside of looking at the piston better. I would have to take the jug off to look at the piston real good. The piston looked good on the top side however. The cylinder wall looked as new. I rotated motor while I had off and everything seems to be tight. I put back together and let it idle for a while in the garage because of the downpour outside. I put a big fan in front of the motor so it would not over heat. After a little while I noticed a slight growling noise in the clutch area. Before I tear into it I want to ride this and listen for sounds better. I think it might be the bearings in the clutch because this noise dosen't do it till I ride it a couple miles. Do you think I am on the right track?
     
  12. RdKryton

    RdKryton Active Member

    It sounds like your on the right track. These engine are all but bullet proof. I have heard of the clutch bearings going south. Keep us informed please. Good luck

    Jim
     
  13. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Hi Polqwa,
    If you have the automatic clutch, most [99%] use a reversed threaded bolt to mount the clutch to the arm. If you have the manual clutch the mounting bolt is standard thread. Be careful when re-assembling the clutch to the arm, because if you over tighten the mounting bolt you will destroy one if not both of the small bearings. Use Loc-tite on bolt.
    If the problem isn't in the clutch, you might want to look at the relationship of the camshaft & crankshaft. By removing the side cover [easy to do on the NE & SE motors] you can see if the camshaft gear is rubbing against the crankshaft throws. If it is touching, you will see faint swirl marks on the crankshaft. The only reason I mentioned this is because I once "beat" the camshaft bearing deeper into case [flywheel side] so that I could use a larger base on the lifter, but when I reved the motor it sounded really bad. I removed the camshaft and "smoothed" the inner edges of the gear, re-installed it and has run perfectly for the last 3 years.
    Hope some of this information is helpful, let us know what you find.
    Have fun,
    Quenton
     
  14. POLQWA

    POLQWA New Member

    Update On Noise

    I took clutch off today and I believe it is the bearings. They feel rough when I put my finger in the center and spin it. I seen a number on the bearings and it is 6901v. I looked this up at a bearing company and all they have are 6901z. Has anybody used this number of bearing? I also noticed my big washer on the bolt has a big groove in it where it wore a scrape on the mating surface on the clutch. I think that bolt had worked loose on me also. I believe I found the noise!!! thanks for all the help guys...
     
  15. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    6901Z is correct. Be sure to not over tighten when installing clutch to arm. Check the alignment of the clutch and the front flywheel pulley, if the belt isn't running true, then use different washers to space the clutch to the arm.
    Have fun,
    Quenton
     
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