Convince me

Discussion in 'General Questions' started by Huntington, Feb 2, 2010.

  1. Huntington

    Huntington Member

    Now is the time to convince me a 4 stroke is better then a 2 stroke for my next build. Not a thread about which is better, more what are the advantages of the 4. I have never used the 4 stroke but have built a few 2.

    What do you guys think?

    The build will be on the Grubee GT2 bicycle, Ill average a 10 mile (round trip) commute 4 days a week, 30mile commute one day a week. Combo of early morning, day, and late evening driving. Mostly flat roads, southern cali.

  2. arceeguy

    arceeguy Active Member

    Superior fuel economy
    Longer life due to oil bath lubrication
    Lower emissions
    No mixing of fuel/oil
    Plugs don't foul as easily
    Exhaust note is perceived to be less annoying than a 2 stroke
  3. Huntington

    Huntington Member

    and what is the best kit out there? I here the honda.. what is it called? and do I need to buy a gearbox separate from the kit?
  4. arceeguy

    arceeguy Active Member

    Sorry - can't help you there. I'm a two stroke fan myself. :)

    But I am looking into a 4 stroke kit in the near future. Regardless of the gearbox, it will probably be a HuaSheng F142 49cc engine as it is affordable and gets great reviews. Honda also makes an excellent engine, but it is cost prohibitive for me.
  5. azbill

    azbill Active Member

    don't forget smoooooth !!!
    unless you like a constant butt massage ;)
  6. Ghost0

    Ghost0 Guest

    Another con is power and weight, my 2 stroke will smoke my 4 stroke any day in every aspect. The 4 stroke weighs about 30% more than the 2 stroke.
  7. HoughMade

    HoughMade Guest

    If you are comparing a HT 2 stroke vs. a 4 stroke...the comparison gets easier. Any 4 stroke is simply a better manufactured engine over all. there are some HTs that last a long time, but it's hit and miss. If comparing something like a Mitsubishi 2 stroke (or any other quality 2 stroke) to a 4 stroke, a bit more difficult because they are well made engines. The advantages are back to what were mentioned above.

    The options for a 4 stroke frame mount kits are Honda or Huasheng (the HS being a "clone" of the Honda). I have a Honda, but most people with the HS are very satisfied. The gearboxes I would personally consider would be the EZM- both versions, the Grubee Skyhawk Stage III (I have a Stage II and like it very much, but they are gone), and the Grubee 4G. There may be others coming to the market, but these are available now.

    I would not ever recommend the Hoot geardrive gearbox- that is the usually the least expensive out there and is sold under different names. You recognize it by the shape of the gearbox which is a figure "8". I also would not recommend the Hoot chain drive gearbox, at least the first version of it. The little chain stretches pretty quickly.

    For a rack mount, there are more engine options (Robin-Subaru, other Hondas, Titan [another Honda clone], etc.) for a drive system, you could have belt, friction or chain from reputable companies like Golden Eagle, Staton, Dax, Dimension Edge or others.
  8. arceeguy

    arceeguy Active Member

    One of my friends admitted that she likes Harley's because "it is a massive vibrator that goes fast, what's there not to love". So there you go, a womans point of view on vibrating two wheeled vehicles. Maybe that's the real reason why they should be called "Happy Time" engines!
  9. azbill

    azbill Active Member

    good one Arcee !!! LOL
  10. arceeguy

    arceeguy Active Member

    Yeah - lol, you could have knocked me over with a feather after she said that!!!!

    I had given her a ride on my Kawasaki Ninja, and she mentioned how smooth the engine was - then she dropped the bombshell on the real reason why women prefer Harley-Davidsons.

    Last edited: Feb 3, 2010
  11. Stan4d

    Stan4d New Member

    I am also looking at 4 stroke, I prefer frame mount. How many different kits are available and how easy is it to install. Price point is an issue also.
  12. Huntington

    Huntington Member

    so if i did go with a 4 stroke, is there aftermarket parts like sbp expansion chamber and can the 4 hit 35mph comfortably?
  13. 4-stroke

    Hi guys, my STOCK 49cc 4-strokes will run all day long, 34-35 mph, carrying a 300lbs plus load, getting 165-185 mpg.

    It is no problem, and much more pleasant than the buzzing 2-strokes I had before.

  14. retromike3

    retromike3 Member

    4 stroke expansion ?

    The expansion chamber is a product of a 2 cycle combustion process. I don't think it would do any good to hook up ether a boost bottle or expansion chamber to a four cycle motor. I guess you could build a "header" that would help the exhaust leave the motor . but I don't think it would come close to the power increase you get out of a two cycle.

    Mike the bike guy
  15. Stan4d

    Stan4d New Member

    Sorry, but I have a newbie request....for the frame mount 4 cycle. Does anyone have a side by side pic of a 2 stroke and a 4 stroke? I have a huffy cranbrook, would a 4 stroke kit fit with out major modification? (I know the pedal cranks have to be changed but other than that is there anything else?)
  16. arceeguy

    arceeguy Active Member

    Stan - I would reconsider the Cranbrook because of the coaster brakes.

    Coaster brakes on a MB are just not sufficient IMO, and the center of the rear sprocket needs to be enlarged to accomodate the larger coaster brake hub. Consider adding front brakes if you motorize it.
  17. HoughMade

    HoughMade Guest

    Here are some pics of my 4 stroke mounted on a Huffy Santa Fe frame. Note I added caliper brakes front and rear. All I had to do to make the sprocket fit is trim the edge off of the sheetmetal dust cover.

    Attached Files:

  18. MikeJ

    MikeJ Member

    Hi Stan4d -

    Welcome to the forum! I went looking for a suitable frame for myself just yesterday.

    My criteria for a frame were: The engine and mount had to fit (Of course!). The frame had to provide for an engine mount plate that was 8 inches long. I assumed the engine was 10 inches high (I am going with the Honda 50 cc engine as an example). I took an inverted cardboard "T" representing these measurements (and a tape measure) with me. If it did not fit in the frame with the 8 inch segment horizontal and 10 inches vertical, that frame was rejected right there on the spot.

    Next, the rear axle dropouts had to be at least 5 1/2 inches apart to support a 7-speed sprocket and wheel. That allows me room for the chain on the left-hand side, yet keep the multiple speed cassette on the right-hand side.

    Next, the frame tubing had to be 1 1/4 inches or greater in diameter or larger for strength.

    Everything after that (wheels, handlebars, tires, better brakes, front forks, crank) are subject to being replaced at will.

    So far, the Schwinn series seems to be the runaway popular item. My choice was a Mtn Tek by Extreme. It is a chromoly steel frame made in Taiwan, a 1996 model. I got it on sale from a recycle bike shop for $95.

    If anyone here has comments (good or bad) about my choice, I'd like to hear them. That way, other newcomers can learn as well.

  19. Happy Valley

    Happy Valley Active Member

    I'd say you made a good choice. I'm not exactly familiar with that badge but chromoly from Taiwan of that era is usually a good pick and far, far better than the current junk from Chinamarts today.
  20. Huntington

    Huntington Member

    Well I got some more GI Bill payments so I'm ready to spend some money. Its a tuff choice for me, 2 or 4 stroke. is there a 4 stroke that can handle lighting?