Predator how to

Discussion in '4-Stroke Engines' started by Stephencatfish, May 1, 2012.

  1. Stephencatfish

    Stephencatfish New Member

    Besides the predator 99cc where to get

    Jackshift assembly, clutch,throttle assembly etc..

    I have searched and search and only site I found was crazy high

    Ty fellow builders

  2. professor

    professor Active Member

    like the jackshaft stuff from Mc Master Carr - you buy the parts separately. Try Pirate for motor bike stuff. Spend time here looking at what the guys have done.
  3. Max-M

    Max-M Member

    professor: McMaster-Carr offers about half a million items at If you feel that they offer a good jackshaft solution, why don't you break a little sweat and give some details to Stephencatfish?! Otherwise, why do you even bother posting?
  4. wheelbender6

    wheelbender6 Well-Known Member

    Time to switch over to decaf, Max-M.
  5. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

  6. Max-M

    Max-M Member

    Or maybe it's time for the professor to switch over to double espressos!

    But seriously: In my way of thinking, these forums are here for the purpose of sharing information, asking questions, learning, etc. I've benefitted greatly from So it irks me a bit when I see postings where somebody makes a half-a**sed effort in responding to somebody's inquiry. The notion of fabricating a jackshaft setup from parts available from McMaster-Carr was intriguing to me. But how about some details on which of their half a million parts are required, and how you do the fabrication?!

    Give it some thought, form complete sentences, provide links and photos...give some valuable and complete information!

    (No offense meant to anybody.)
    Last edited: May 3, 2012
  7. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Just finished my 3rd cup of coffee, and all is well.

    Take time to research the possible options for your drive system.
    A little research goes a long way, and more importantly try to avoid the many mistakes made by others when attempting to connect the motor to the rear wheel.

    If you are looking for a way to transfer the most power, consider NOT affixing the clutch to the crankshaft. The HF 79 & 99 CC motors already have LARGE flywheels and I know adding more flywheel weight only slows down the rate of acceleration, and asks the motor to give up some of the power to spin the clutch at full motor speed.

    Consider locating the clutch to the rear of the drive and only spin at 1/2 motor speed. Take a look at the construction of the Q-Matic drive and you will quickly see why it transfers more power to the rear wheel than most other systems. The Q-Matic also employs an automotive wedge primary belt in place of the chain [less noise, cleaner, and maintence free], and makes the drive much thinner.

    If you need detailed pictures, just ask.

    BTW, my 99CC test bike with the Q-Matic drive, easily exceeds 50 MPH and climbs most hills.

    Have fun,
  8. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Here is another set up with the clutch on the jackshaft.
  9. Stephencatfish

    Stephencatfish New Member

    Where to get q matic??
  10. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

  11. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    The Jackshaft plate with the clutch on the rear will need additional support or the bearings might fail. It isn't wise to expect the bearings to support the clutch without additional support.

    Q-Matic drives are available from any of the Authorized dealers listed on our site. Many of the members of this site are authorized EZM dealers.

    We have sold approx. 50 Q-Matic drives to fit the HF series of motors, and are a direct bolt on part.

    If you need additional information, contact me via PM or any Authorized EZM dealer.

    Have fun,
  12. Stephencatfish

    Stephencatfish New Member

    I went to the ezbike site cannot find any info on kit and what's included and what is needed besides engine and kit
  13. Max-M

    Max-M Member

    Speaking as the owner of a cruiser with a 49cc Huasheng 4-stroke coupled with a Q-Matic drive -- for a couple of fun years so far -- I want to say that I have great admiration for Quenton Guenther, his company and his Q-Matic drive. The Q-Matic is about as bullet-proof a piece of engineering as I've seen, and it's been a trouble- and maintenance-free component of my motored-bicycling experience unlike any other. And the company and its owner are very accessible, open and responsive to questions and suggestions -- and just nice, regular people who are clearly as enthusiastic about this quirky and cool hobby as most of US are.

    The concept of using a jackshaft and having multiple gear capability was enticing to me at one point. Then, I came to realize that my wonderfully straightforward "twist-and-go" drive system powered by a relatively quiet and reliable 4-stroke, a Q-Matic drive and a 56-tooth drive sprocket (and a chain tensioner of my own design), gives me all of the speed I want, and plenty of hill-climbing power. I now look at the 2-chain system as the ideal setup: Bicycle on the right side; motorcycle on the left side. In my opinion, these motorized bicycles -- a combination of disparate parts that you pray will work well together! -- are the most reliable and enjoyable when they are as functionally SIMPLE as you can build them. For me, maximizing my trouble free riding hours and miles is the ultimate goal. I'm not trying to set speed records. I'm not trying to overanalyze the relative efficiency of various complicated drive systems. I just want to know that I can start my bike, climb on, and ride for as long as I want without having any more reliability concerns than I do, for example, with my 2011 Toyota FJ Cruiser SUV.

    I'm not writing this to "suck up" to EZ. These people don't even know me. Rather, in a hobby that has way more than its share of vendors that are questionable, unaccountable or even downright corrupt operators, I'm taking this opportunity to express my humble endorsement of a company that I consider to be a very solid, trustworthy and honorable organization.

    Viva EZ Motorbike!
    Last edited: May 7, 2012
  14. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Hi Max-M,

    WOW!, thanks for the kind words.

    I must admit motorbikes have played a major part in my life, from the first Whizzer in 1958 [13 yrs. old] to riding the latest test bike this morning. We enjoy motorbikes, and never stop trying to make them better and more trouble free.

    Hi Stephencatfish,

    EZM products are marketed via Authorized dealers and anything you want to know is displayed on many of the dealers websites. You are also welcome to contact us directly for detailed information 7 days a week [I talk to at least 30 people every day]. I will attempt to answer a few of your current questions, the EZM kit includes a 49 CC four-stroke HS 142 motor, Q-Matic drive, gas tank, exhaust pipe, #41 chain, 56 tooth rear sprocket, motor mount, throttle control [with kill switch], mounting hardware, and installation manual. I think all you will need is a bicycle.

    EZM also offers the Q-Matic drive to fit several current 4 stroke motors, including Lifan, HF, Honda, B & S, etc.

    I hope this information is helpful.

    Have fun,
  15. tigmaster

    tigmaster New Member

    Your close but You cant drive the clutch with that set-up,You need the insides of the clutch spinning to drive the bell of the clutch,way pictured will only spin the bell....Tigmaster....
  16. Max-M

    Max-M Member


    tigmaster: With all due respect...HUH?!
  17. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Looks like he is correct. The chain sprocket on the motor will need to spin the shaft, not the output drum [bell]. The shoes are driven by the the inner hub and it must be spun by the shaft. Of course spinning the heavy clutch without additional support will lead to bearing failure and alignment issues. I normally don't display pictures of our drive, however I will show an early prototype drive with a special rear belt drive clutch [made by MaxTorque to fit our drive]. Please note the clutch is held in place by 2 large [1.375"] bearings, and one side effect is a much smoother transfer of power. Also note the HD AX series drive belt used on the more powerful motors. Notice how closely the Q-Matic drive and the HF motor fit together. The exhaust exit is above the drive to avoid any conflicts, and the rear bearing carrier is approx 1/2" from the valve cover.

    Hope this helps in your quest to connect the HF motor to you rear wheel.

    Have fun,

    Attached Files:

    Last edited: May 8, 2012
  18. tigmaster

    tigmaster New Member

    What Mr.G said,did'nt mean to confuse You....Quenton, I like the way You used an adapter to spin the ex.And what is that air cleaner from?...Tigmaster....
  19. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Hi Tigmaster,

    Air cleaner is from 1999 Whizzer. I got the idea from the Davis brothers [Chris & Jim] in PA at the bike event in Lewes, DE. They where the first to use the HF 79 CC with the Silent & Q-Matic drives and used the Whizzer breather.

    It might be wise to take a close look at the throttle system and the way the cable enters the motor from the front.

    Directing the exhaust forward and then under the motor keeps the hot exhaust system away from the rider, but pipe length, I.D. and restrictor must be considered to enhance the power of the motor.

    Have fun,

    Attached Files:

    Last edited: May 8, 2012