Should a cam gear look like this ?

Discussion in 'Whizzer Motorized Bicycles' started by heyw00d, Oct 11, 2012.

  1. heyw00d

    heyw00d New Member

    I've been disassembling the engine I picked up. It's not the crank that was locked but I believe it's the cam. The crank has some play & moves a slight bit but the cam does not. I'm concerned about the look of this cam gear so i've attached a photo. I thought maybe there was a circlip holding it in place but theres nothing, and the opening seems very rough (as can be seen in the pics) since there is no circlip i figured it would just lift right out but nada. It moves & lifts a little on one side but i don't want to force it in case something is holding it in place.
    Any advice ?

    Also, can anyone recommend someone that rebuilds these engines ?

    Attached Files:

  2. Fabian

    Fabian Well-Known Member

    At some point in time the engine (and after many miles) will come to the end of it's life.

    When that happens it might pay to upgrade to a 2-stroke engine and a SickBikeParts shift kit - a much better option.
  3. jbcruisin

    jbcruisin Member

    I've always heard that people start out with 2 strokes & upgrade to 4 strokes.
  4. Fabian

    Fabian Well-Known Member

    That's because they choose to sacrifice performance and simplicity and low engine weight for mechanical complexity, a heavier engine and reduced power.

    I have no idea why they would do such a thing - it's beyond my comprehension.
  5. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    A 50cc 4 stroke with a Sick Bike Parts shift kit is a great option.

    The Chinese 2 stroke bicycle engines have such low quality control
    and design flaws that they are a very poor choice for real transportation
    or even just a fun toy.

    No one who enjoys Whizzers is ever going to give them up in favor of
    the 2 stroke hand grenade.

    There is a rapidly growing trend of 2 stroke riders upgrading to 4 strokes.

    However this is the Whizzer forum so your promoting of 2 strokes here is
    just more of your trolling behaviour.
  6. heyw00d

    heyw00d New Member

    Thanks for the info.
    I guess this ends my foray into whizzers then. I've never done a motorized bike before & this was gonna be my winter project. I picked up the engine for $50 and I was looking to pick up a bike for appx $150 locally. I wasn't anticipating whats been outlined of buying a whole new engine. I've got a 62 sears allstate puch compact for 2 stroke, this seems like it would have been a cool project and I didn't even know whey were 4 stroke till i got there & saw the engine.
  7. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor


    Sorry I haven't been on much recently as my wife has Cancer and have been busy with doctor apointments.

    You should complete your project and use the vintage Whizzer motor. No 2-stroke, no current 4-stroke will ever deliver the raw power and torque of the vintage Whizzer motor. I have thousands of vintage Whizzer parts and a lot of my friends also have large quanities of vintage Whizzer parts. There are also a vast amount of repo parts [most are EXACT reproductions].

    The camshaft in the picture doesn't look beyond repair, and even if it is, there are plently of good used ones around. Whizzer used the same camshaft in 95% of thier motors ["H", "J", "300", "500"]. I even have re-grinds of the famous "Weber" hi-performance camshafts in stock if needed.

    We be thrilled to help you with your project!

    Have fun,
  8. mason_man

    mason_man Active Member

    Quenton, sorry to hear sad news. you and yours have my prayers.
    let me know if i can be of any help.

  9. Mike Notigan

    Mike Notigan Member

    I second what Ray says! I want to wish your wife and yourself nothing but the best in the coming days, weeks, months, etc. The 2 of you will be in my prayers as well. Although we have never met in the flesh, the correspondence we've had on these pages, through PM's, through these Whizzer threads and through the Whizzer Newsletter, it's like we've all met each other. It's a comforting feeling to know you are there always ready to help a Whizzer enthusiast and such a punch in the gut to see where your wife and loved best friend is not feeling well.

    Your willingness to help others is a testament to the man that you are, but just as importantly, what kind of lady Mrs Guenther must be! Without doubt, everyone who reads this will be pulling for Mrs G and yourself. God bless!

    Be well,
  10. heyw00d

    heyw00d New Member

    Thanks for the advice. Based on prev posts I'd just about given up on it but I got a message from Quenton so I dove back in. I'd sprayed it liberally with kroil so when I went back out to it after a few days a few hard turns to the flywheel and it free'd up.

    I'd like to get the engine totally disassembled now, where can I find some reference guides online. Before anyone mentions it, yes I'll buy a manual but I can only do so when funds allow, I'll certainly have one to begin reassembly but theres not too much left to dismantle on this engine and i'd really just like to do it the right way & not have it be guess work. So any places online I can find info ?
  11. mason_man

    mason_man Active Member

    I really don't think that there is any online mats.
    you need to get the whizzer newsletter to get all that info.
    if you don't have the camshaft spacer #23 then the camgear will eat up the crankcase cover. and the crankshaft spacers come in different sizes #40.

    Do you have a H,J, or maybe the 300 motor? Great score for that price anyways!


    Attached Files:

  12. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Thanks everyone for the support in these trying times.

    Here is the best option to purchase a manual.

    will have the Whizzer service facts manual, if not try Mike at

    If you need additonal help you are welcome to call me at 252-475-0406

    It is important that you know several facts rebuilding the motor, such as the rod bolt are a different length and can destroy the motor if installed incorrectly. You also need the correct clearances for the piston, rings, crankshaft. I know a lot of shortcuts that can help you during re-assembly and simple tools you can use in the process.

    Have fun,
  13. mason_man

    mason_man Active Member

    This sounds like some good advise,and a good safe guard.

    Last edited: Oct 24, 2012