Finishing First Build - Leftover Parts??

Discussion in 'Motorized Bicycle General Discussion' started by navifty, Mar 1, 2012.

  1. navifty

    navifty New Member

    Joined:
    Oct 22, 2011
    Messages:
    18
    Likes Received:
    0
    I'm finishing up my first build of a knock-off using some vague instructions, and I have some leftover parts. I got the motor from some other guy, so I don't know if he just threw random stuff into the box or if these are actually parts that should be used. Does anyone know what this stuff is for? I'm especially concerned about 13, which looks like some kind of tiny filter.
     

    Attached Files:

  2. Rocky_Motor

    Rocky_Motor New Member

    Joined:
    Nov 14, 2011
    Messages:
    367
    Likes Received:
    0
    I recognize 6, 13, maybe 11 and 10.

    6 are bolts that would go to your sprocket clamp. Maybe he had extra, did you put a bolt through every hole in the clamp?

    13 is a gas tank filter from the chinese valve/petcock. Something to be thrown away and replaced with a better one in my opinion. Anyway, as long as your gas tank was clean of debris before hand and you have an INLINE fuel filter then that piece isn't very important.

    11 I think is the spring that is part of the clutch mechanism. Have you gotten to ride your bike yet?

    10 must have been part of a large downtube adapter. Not important if you didn't need it. It's typically only mountain bikes that have the large downtube.
     
  3. biken stins

    biken stins New Member

    Joined:
    Jul 11, 2008
    Messages:
    156
    Likes Received:
    0
    #13 looks like it might be the fuel filter. Screws onto the petcock. Should use a in line filter you will be better off.
     
  4. bairdco

    bairdco a guy who makes cool bikes

    Joined:
    Aug 18, 2009
    Messages:
    6,334
    Likes Received:
    19
    1. muffler strap or chainguard strap. useless.
    2. large frame adapter plate. goes with 10, u bolt for larger downtube.
    3,5,and 8 look like engine case bolts. 3, case. 5, case or drive gear cover. 8, clutch cover.
    4, looks like an air filter bolt.
    6, rag joint bolts, or extras for muffler strap.
    7. throttle assembly bolt
    9. heat shield bolts?

    *11. looks like the clutch spring behind the plate. you gotta take off the flower nut to get to it. this, you need. if you've got one in there already, you're ok.

    12. i dunno.
    13. fuel filter, screws into petcock, inside tank. semi-useless.
     
    #4 bairdco, Mar 1, 2012
    Last edited: Mar 1, 2012
  5. GearNut

    GearNut Active Member

    Joined:
    Aug 19, 2009
    Messages:
    5,105
    Likes Received:
    1
    12 looks like a clutch adjusting nut for 1941 to 1984 Harley-Davidson Big Twins.
    What it could be used for on an MB I dunno.... They have 3/8-24 threads.
     
  6. navifty

    navifty New Member

    Joined:
    Oct 22, 2011
    Messages:
    18
    Likes Received:
    0
    Thanks guys. So the clutch spring is the main one I should be worried about... where exactly does this go? Flower nut? Does it go inside the handle of the clutch, or on the motor?
     
  7. GearNut

    GearNut Active Member

    Joined:
    Aug 19, 2009
    Messages:
    5,105
    Likes Received:
    1
    It is a release spring. The spring goes inside the clutch, in between the pressure plate and clutch hub. It assists in pushing the pressure plate out and away from the clutch to dis-engage it when you squeeze in the clutch hand lever. It is not the main pressure spring that clamps down everything to lock up the clutch when you release the hand lever.
    The flower nut is the adjustable nut that fits onto the clutch center stud. It is adjustable so you can tune the clutch for proper operation.

    Here's Norm's tutorial on clutches: http://motorbicycling.com/showthread.php?t=222
    Here's a tutorial I made on adjusting them with excellent additions by KCvale.
    http://motorbicycling.com/showthread.php?t=22726
     
  8. KCvale

    KCvale Active Member

    Joined:
    Feb 28, 2010
    Messages:
    3,886
    Likes Received:
    19
    Thanks for the Kudos gearnet ;-}

    #11 looks a bit big for the clutch friction plate spring but it could very well be, you don't want to run without it if it is, in fact the clutch may not even disengage without it there to push the friction plate away when you pull in the clutch lever.

    One spring you DON'T NEED is that long skinny one between the clutch arm on the left side of the motor and where the clutch cable sheath meets the motor on the right.
    All it does is make it harder to pull the clutch in.

    One spring you DO NEED is the fat long one on the clutch cable where it is right by the cylinder on the right side to keep the clutch cable from laying directly in contact with it.

    If your bike is built and you can roll it with the clutch locked in and not with the clutch released you should be good.
     
  9. donphantasmo

    donphantasmo New Member

    Joined:
    Oct 3, 2010
    Messages:
    360
    Likes Received:
    0
    Dude, when I put an aircraft engine on an engine, there are always "leftover parts". You'll be ok...
     
  10. 2door

    2door Moderator
    Staff Member

    Joined:
    Sep 15, 2008
    Messages:
    16,301
    Likes Received:
    25
    Note to self: Don't fly planes that Don worked on :)

    Tom
     
  11. navifty

    navifty New Member

    Joined:
    Oct 22, 2011
    Messages:
    18
    Likes Received:
    0
    Here's a followup on my current progress. I haven't gotten the engine to fire yet and I have no idea what's preventing it from doing so. It turns over fine, clutch seems functional, I switched out spark plugs, tried 2 cdis, and checked the carb for fuel flow. I'm pretty new at this, and the only things I can think of now are pressure or fuel somehow not being used by the carb.

    However, I've tried pulling the spark plug out of the engine and giving the pedals a good push to see if it's sparking and I have yet to see a spark. If the plug is new and cdi is good, what is preventing it from sparking with a good push?!
     
    #11 navifty, Mar 5, 2012
    Last edited: Mar 5, 2012
  12. takeitez

    takeitez New Member

    Joined:
    Dec 19, 2011
    Messages:
    139
    Likes Received:
    0
    Your mag could be shot. I would look it up in the search bar and check it out.
     
  13. biknut

    biknut Active Member

    Joined:
    Sep 28, 2010
    Messages:
    6,365
    Likes Received:
    3
    Gimmie spark gimmie fire, gimmie all that I desire.

    If there's no spark, maybe the wireing is wrong.

    Black to black, and blue to blue. Then one of the wires from the kill switch goes to black, and the other wire from the kill goes to the other. It's so easy a caveman could do it.

    Forget the white
     
  14. GearNut

    GearNut Active Member

    Joined:
    Aug 19, 2009
    Messages:
    5,105
    Likes Received:
    1

Share This Page