Tranny comparisons for frame mounted motors

Discussion in 'Frame Mounted Engines' started by Zomby Builder, Nov 12, 2007.

  1. I have used all of the following trannys with pocket bike motors. These trannys are interchangeable with all of the engines used. Robin 35, Mitsubishi 43, China Moon 49, GPS 460 They will work on most other small engines under 50cc.

    The first is just a simple drive centrifical clutch. It comes with most motors that you buy from racing manufacturers.

    Cost $0 when you buy the motor. $15 by itself.
    Left side drive.
    IMG_0982.jpg

    IMG_0983.jpg

    IMG_0994.jpg

    IMG_0995.jpg


    This is a 3 to 1 gearbox from China. It reverses your drive to the right side.
    Cost about $30 from several suppliers.


    IMG_0992.jpg

    IMG_0985.jpg

    IMG_0993.jpg

    IMG_0988.jpg



    This is a Staton-Inc approx 8 to 1 gearbox. They have improved this model & it is no longer on their website.

    Cost approx $150 up to $225 for the improved 18 to 1. Chrome plating another $80.
    right side drive.

    IMG_0991.jpg

    This is a China made CVT with a 3 to 1 gearbox & a 2 to 1 belt drive.
    Cost $79
    right side drive.

    IMG_0990.jpg

    A pretty good assortment I thought. I started out just looking for the best all around tranny & found that there is no real place where you can compare the options. I know there are other trannys out there, but here are my observations on these.

    #1 Why do you even need a gearbox?

    Gear reduction is important to achieve the low end torque you need for a specific weight rider & bike & must be matched to the horse power that you have. I don't have a formula. Trial by error. All of these I use on a jackshaft to further reduce the gears & to change ratios if needed.

    #2 How much reduction do you need?

    Depends on HP of motor & how much low end power and high end speed that you want.

    If you look at the pocket bikes you will notice that most of the fast ones do not use a gearbox. The sprockets on the rear wheels are almost as big as the wheel. Bicycles have a much bigger rear wheel so a sprocket this big is not practical. Therefore you will need to reduce the ratio through a gearbox or a jackshaft or both.

    Results:
    Straight cent clutch is the most efficient, but you have to run a very large sprocket on your jackshaft.

    China 3 to 1 is my favorite. Less size sprocket on jackshaft & lightweight & VERY QUIET.

    CVT works well but lose some HP & they WHINE at high speeds. Very nice mounting plate though & solid true rubber mounts. Almost overcomes the WHINNING.

    Staton gearbox was the most expensive & looks to be the best built. It is NOISY. Only grease inside it. I will cut my own gasket some day so I can add some real gear oil. It is also Heavy. Mounting is very solid & makes up for some weight. The output gear is nice because you can run reg mc chain. Dave also has been a tremendous help to me as a gear & axle supplier. He has built a few fo showwwre!! ALL my jackshafts have a Staton part or two in them. Thanks Dave.
     
    Last edited by a moderator: Nov 12, 2007

  2. alesterfeind

    alesterfeind Guest

    Some of those little motorized scooters kids ride on where they just stand on it are fast. I was behind a kid the other day with my bike wide open going 35mph, and I could barely catch up to him. I wondered if he had some kind of transmission on there, or those little motors can really go that fast on their own.

    It would help a lot of us if someone gave step by step directions on installing a transmission. I plan on getting a 4-stroke motor in the next year, and a transmission would be nice. I won't have a problem putting one on as long as I know what to do.

    Thanks for the information on the transmissions Zomby.
     
  3. azbill

    azbill Active Member

    very helpful comparison...
    thanks !!! :D:D:D
     
  4. beast775

    beast775 Guest

    excellent comparison

    i enjoyed that! good comparisons:smile:
     
    Last edited by a moderator: Nov 12, 2007
  5. Alaskavan

    Alaskavan Guest

    Very informative post. Thanks for the info.
     
  6. 5-7HEAVEN

    5-7HEAVEN Guest

    :cool:Thanks, Zomby. I needed to know that.

    Myron
     
  7. Still looking

    The ultimate tranny is one that makes the bike "WORK" I've seen many others on this site that do just that. Belt drives included. We are reinventing a 100 year old concept with better technology. So bring it!!
    Who Dat?
     
  8. Danny3xd

    Danny3xd Member

    Thanks Zomby, cleared up a bunch of questions I had. Do you still have the names of the Chinese, reversing right side gear box supplier(s) I have been looking and can't find any. I have 2 freewheeling crank sets and would be perfect if I can find a couple.
     
  9. suppliers

    Hey Dan you should look on ebay or any gocart or goped parts dealer will sell any of these trannys.
     
  10. Danny3xd

    Danny3xd Member

    Kewl, thanks again Zomy.
     
  11. Danny3xd

    Danny3xd Member

    Zomby! My bad, sorry bud.
     
  12. sunofjustice

    sunofjustice Guest

    Zombybuilder, love da pictures yo! Excellent presentation! I'm chomp n at th' bit to try installing another pocket bike engine................... (alot more potential!)......... EXCEPT, it will be bolted up to a mountain bike (mtb). I tryed this before last year...... with crappy results because th' gearing , as well as th' tire size didnt quite match. Please correct me if I'm wrong, but...........what if you CUT away(dremmel) just th' gearbox part of a happy time(?) china engine......... and weld th' smaller of the two gears in th' trans housing to a jack shaft .......the other end would connect to a pocket bike sprocket with chain........that finally connects with th' pocket bike engine. What do you think? sunofjustice (brian)
     
  13. Shoulda Kept my Siezed Happy time

    That is truly off the CHARTS Brian. I wished I still had my siezed happy time motor. I might try doing something like that. Oh well you might know how frustrated I was when after trial after trial that POS siezed up on me. It's at the bottom of the lake with the OTHER SLUGS----BAIT!!! Sleepin with the fish. I got a perfect mtn bike to tear up too... Gear a POCKET REAL LOW SO THE BAND KICKS IT TO 20. Then what????

    IMG_0622.jpg
     
  14. sunofjustice

    sunofjustice Guest

    Zomby......mad props for this phat thread, big pimp n!....Didnt mean to jack yer glory, though. Seriously..........thank you 4 this post. brian
     
  15. uncle_punk13

    uncle_punk13 Guest

    I've seen in use, and have one on the way for a project, the old Albion kick-start, three speed trannys from pre '73 Rokon motorcyles in conjunction with Whizzer and briggs applications. Harder to find nowadays and the prices keep rising, but they are out there and really seem to work well. I personally have no 'hands on' experience with them yet, but these various other fellas I know really dig 'em. So that's a thought. What about transmissions from riding mower/lawn tractors? Any one looked into these or...?
     
  16. Dug3x3

    Dug3x3 Guest

    uncle punk13 , you mentioned the albion trannys on the old Rokons. This guy is a friend of mine www.fillmanengineering.com and he sells used ones and builds replacement parts. good luck doug
     
  17. Haggard

    Haggard Guest

    Keep your eyes open for anyone parting out or tossing an old honda express 2 or honda elite from late 70's and through 80's.. these both have exc. cvt's on board that can be used. other ride on scooters might have these also.
    recycle, save money, and go faster, you gotta love it!!
     
  18. fetor56

    fetor56 Guest

    +1.
     
  19. Cvt

    I just spun out my CVT. The DDMotors 460 with the T.S. ported head & 15 to one piston was just too much for it. Sounds killer when it gets above 10,000 like a very Pi-ssed off Bee. Back to the drawing board. I got it up to about 7,000 in high range & it just started to freespin. I didn't know that a CVT could smoke... A gearbox has it's merit. I am going to go with a 4 stroke Whizzer motor. Do the gear reduction with the jackshaft & rear sprocket. I don't want to rile up my neighbors any more than I already have.
     
    Last edited by a moderator: Dec 9, 2007
  20. mnbiker

    mnbiker Guest

    Is there any for a 5hp 3/4 inch shaft? I need a 3 to one or even 2to 1 reduction badly.
     
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