Starting Up Hill - Which Clutch Is Better?

Discussion in 'Whizzer Motorized Bicycles' started by fsprandy, Jun 26, 2008.

  1. fsprandy

    fsprandy Member

    Nothing worse on mine than having to take off on a steep incline. Is one of the clutch options better than the other for this?

  2. Who, and where are you?

    Hi, it's a great help to introduce yourself, yes there are 3 clutch sizes, but I don't know what bike you have, what your geography is or anything.

  3. fsprandy

    fsprandy Member

    Auto Or Manual Clutch

    Sorry, let me clarify. Is the auto clutch or the manual clutch better for starting uphill. Assuming the operator has excellent manual clutch control.
  4. RdKryton

    RdKryton Active Member

    I have found the auto clutch to be better in my case. Once the auto clutch is broken in it will lock up at about 2200rpm. Up to that point it will slip and keep the engine it's power band.
    Please stop buy the intro forum and say hello. We like to get to know who we are helping. Thanks

  5. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    If "hills" are an issue, consider the 70MM automatic clutch, however your top end will be reduced by an average of 10 MPH at 5000 RPMs. 5000 RPMs with the slip or 90 MM automatic clutch will carry a Whizzer to a top end of 43.01728 MPH, whereas the 70 MM automatic clutch @ 5000 RPMs will top out at 33.83424 MPH. Please do not consider my information as an endorsment to exceed the suggested speed of 25 MPH, but rather the difference between the 2 clutch sizes.
    Please order the clutch from your local dealer or Whizzer USA [1-877-944-9937]

    Whizzer OuterBanks LTD
    A North Carolina Corporation
    Quenton "Lee" Guenther
    252-475-0406 cell
  6. fsprandy

    fsprandy Member

    Thanks Quenton.

    Hills aren't so much the issue - just starting on hills. My question is whether the auto clutch is a solution to the problem. I doubt it would be since I can control the slippage optimally with the manual clutch. More like too much gear for too little motor. Are there pulley options to reduce the gearing with the manual clutch?
  7. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    The manual clutch is only available in one size. 127 MM X 90 MM. 127 MM = 5", 90 MM = 3.5433". The actual ratio [corrected] is 8.89 X 1. The uncorrected ratio is 8.46668 X 1. The corrected ratio on the 70 MM automatic is 11.43 X 1.
    If you need more information, just ask. I am open 7 days a week if you need help or information.

    Whizzer OuterBanks LTD
    A North Carolina Corporation
    Quenton "Lee" Guenther
    252-475-0406 cell
  8. peter nap

    peter nap Member

    I just sent you a PM with a possible solution to the problrm. Scroll to the end of the attached link and contact the person if needed.
  9. Starting uphill

    Hi there, well I most surely was confused! Why would you want to start the engine going up hill?

    Why not go down hill to start and circle back up around?

    I'm sure I do not understand this, but am willing to help if that were possible.

  10. fsprandy

    fsprandy Member


    Say I stop at a 4-way stop, I'm on an uphill, and I'm turning right onto an uphill. It's heavy, commuter traffic. The road after the stop is not only uphill but narrow so if I don't get going I'll be holding up a bunch of commuters. The speed limit is 35 which means if I could get up to near 30 in a reasonable time I wouldn't feel too bad.

    The overall grade isn't steep. I could probably maintain over 20mph on it if I wasn't starting from a dead stop. It's steeper for the first little bit turning the corner.

    Would an auto clutch allow me to get up to cruising speed significantly faster than mad peddling, revving, and squealing?
  11. bill green

    bill green Member

    Howdy It sounds like the problem is more lack of torq than anything . I would mill the head .070 and increase your compression from 90 psi to aprox.130 psi and will make A big difference in torq. or pull power..Hope this helps Bill Green
  12. sparky

    sparky Active Member

    Pedaling + whatever engine & clutch you choose will always beat not pedaling with the same engine & clutch combination.

    But automatic clutch is definitely waayyy nicer, IMO... as I can carry something in my left hand, while gassing or braking with my right. I dunno all the details for Whizzers & belt-drives, tho.
  13. peter nap

    peter nap Member

    The peddles are essential parts of the Whizzer (more on that in a second)

    Bill is right! More torque is important, especially with the 90cc clutch. The problem with more torque is transmitting it to the wheels. Whizzer stock belts are marginal at best. The small belt will slip and squall under a stiff load. Belt dressing helps but a good quality belt and making sure it's tight is better.

    Do a search here for a thread where Quenton outlines how to remove the glazing from a clutch. Helps a lot.

    Now to the peddles. I bought an Ambassador (contingent on a test drive) .
    I did test drive it. It is like trying to sail a garbage scow in a hurricane.

    Without the peddles and with the added weight, it just doesn't want to get moving. I;d be terrified to take that thing in heavy traffic with stop lights. Needless to say I backed out of the deal as I wanted something to use where my NE5 was just too slow. (I bought a Honda XL600R that did 92 in the quarter when I test drove it. Nice bike for a mature elderly man:grin:)
    Last edited: Jun 30, 2008
  14. fsprandy

    fsprandy Member


    Nice informative post. The squealing is me slipping the MANual clutch to get as much 'acceleration' as possible. When fully engaged (I was taught disengaged in farm class) the clutch doesn't seem to slip at all. Normally, I pedal up to about 14mph, drop the clutch, and let the engine take it from there.

    I'd really worry about the unintended consequences of a compression increase too. Right now it purrs along so nice at cruising speed. Very mellow and relaxed. Easy to imagine I'm riding an early 1900's motorbike. More compression would mean more heat, more vibration, and higher loads on an already fragile platform.

    I really don't know what they were thinking with the Ambassador??? I wish they put the effort into Whizzer improvements instead.

    Hey, I've got one of those XL600R's too!