New 4 stroke motor...........

Discussion in 'Motorized Bicycle General Discussion' started by donutguy, Aug 26, 2011.

  1. donutguy

    donutguy New Member

    Joined:
    Feb 4, 2010
    Messages:
    230
    Likes Received:
    0
    Just installed my new friction drive unit and 4 stroke motor from thatsdax.com. So far....I am extremely impressed with this unit.

    It's *very* quiet and the torque this puppy puts out is way better then any 2 stroke I've owned.

    The instructions are very specific on break-in......the first 500 miles are to be ridden in a very conservative manner and the valves will also need adjusted occasionally.

    I am able to climb the same hill I would have to go 3/4 to full throttle on my 2 stroke.....the 4 stroke has *way* better low end torque-all I needed to get up and over the same hill with the 4 stroke was 1/4 throttle.

    I think this motor will fit my riding style very nicely, I'm not sure what the top end speed is like with this unit, but since I like to go about 20-25 mph most of the time-this unit is going to work very well for me.

    It seems to go 20 mph with the throttle barely cracked....it will be interesting to see what this piece will do once it's fully broken in.
     
  2. mapbike

    mapbike Active Member

    Joined:
    Mar 14, 2010
    Messages:
    5,380
    Likes Received:
    2
    Great info. donutguy

    I look forward to hearing more updates on how it is working out for you, I've been looking at getting one of those setups myself, I'm currently working on a homebuilt FD using a small weed wacker engine on a 20" bike, I know it wont be very powerful but it may be a fun setup to play around on just the same.

    I'll bet that 4 smoker is pretty smooth running too.......


    Peace, map
     
  3. oldtimer54

    oldtimer54 Member

    Joined:
    May 15, 2010
    Messages:
    539
    Likes Received:
    0
    Sounds like a nice setup. How about a pic? Soooo why are you the donutguy? Do you make em or just eat em?
     
  4. The_Aleman

    The_Aleman New Member

    Joined:
    Jul 31, 2008
    Messages:
    2,658
    Likes Received:
    1
    Welcome to the smoother, more reliable side of MaBs :D
     
  5. MotorizedEtc.

    MotorizedEtc. Member

    Joined:
    Jul 10, 2010
    Messages:
    159
    Likes Received:
    0
    It was only a matter of time...
     
  6. donutguy

    donutguy New Member

    Joined:
    Feb 4, 2010
    Messages:
    230
    Likes Received:
    0
    Mapbike......it is a world of difference in the smoothness dept.

    I also *LOVE* how quiet it is. It's too early to tell which motor is faster as the 4 stroke needs 500 miles to fully break in and the instructions say to take it easy. Not all that concerned anyways...as long as it helps me get up hills:)

    I use donutguy as my handle because I am a pastry chef and I make bakery products (and donuts) at my job.
     
  7. scotto-

    scotto- Custom 4-Stroke Bike Builder

    Joined:
    Jun 3, 2010
    Messages:
    6,530
    Likes Received:
    6
    Do you also make these kind of dnut ? I like dnut dnut and 4-strokes

    dnut
     
  8. oldtimer54

    oldtimer54 Member

    Joined:
    May 15, 2010
    Messages:
    539
    Likes Received:
    0
    Cool I also make donuts and was just asked if I wanted a job helping a friend start a donut shop. Soooo do you role out your donut dough or do you do a batter? I go for the batter my self.
     
  9. Acraze

    Acraze Member

    Joined:
    May 13, 2011
    Messages:
    231
    Likes Received:
    0
    Maybe you can whip up some super duper donuts for the local police and tell them and make em respect these MBs
     
  10. donutguy

    donutguy New Member

    Joined:
    Feb 4, 2010
    Messages:
    230
    Likes Received:
    0
    Actually Oldtimer.....I make both.

    The yeast raised donuts are more popular, but we still make about 15% of our production with cake donuts.

    Donut shop? That's a lot of work and a LOT of hours to start up a new bakery :)
     
  11. Dan

    Dan Staff
    Staff Member

    Joined:
    May 25, 2008
    Messages:
    12,646
    Likes Received:
    65
    Cool Doughnut. Always fun to read that things are going well.

    I have yet to build a FD but the first time I rode one, was in love. Just so smooth and (was a rack mount) all the vibes and noise were aft and I was moving forward. On top of that, no engine to try and peddle around. 4 smoke guy here as well.

    The 2 strokes are beautiful but for ridding, just prefer the 4's.


    Post some pics when ya can!
     
  12. donutguy

    donutguy New Member

    Joined:
    Feb 4, 2010
    Messages:
    230
    Likes Received:
    0
    For sure.......if I had known how smooth 4 strokes were-I woulda started off with one. Just the fact that it is so darn quiet has me sold. I ride with some of my non-motored friends and noise has always been an issue.....I'm pretty sure my buddies will like the change.
     
  13. mapbike

    mapbike Active Member

    Joined:
    Mar 14, 2010
    Messages:
    5,380
    Likes Received:
    2
    Speaking of the 4 strokes here, I've noticed that Duane has the Titan XC50 which is claimed to produce 2.5hp @ 7500RPM's and he also has the XC50S which claims 3.0hp @ 7500 RPM's.

    Each of these engines show to be the same 48.8cc's and look identical so I'm wondering what the difference is in them.......?????

    If they are both the same CC engines and they are both governed at 7500RPM's what is making one of them .5hp more than the other?

    Just curious....Shrug!

    Any ideas fella's?

    Peace, map
     
  14. donutguy

    donutguy New Member

    Joined:
    Feb 4, 2010
    Messages:
    230
    Likes Received:
    0
    The difference is torque. To get up a moderate hill....I only have to crack the throttle open maybe 20%. The "S" motor has more torque. I've noticed that so far-the 4 stroke motor has way more low end grunt then my 2 stroke motor from thatsdax.

    The 2 stroker has way more top end, but I think the 4 stroke is gonna be a good match for my riding style.....I like going about 20 mph most of the time and it seems like the 4 stroke does this without even breaking a sweat.

    The 2 stroker was just "coming on the cam" at 20mph....not much torque at that speed....if I had to go up a hill with the 2 stroke-I need to get a decent run at it and even then-near the top....the motor would start to bog down somewhat. The 4 stroke doesn't bog down nearly as much.
     
  15. mapbike

    mapbike Active Member

    Joined:
    Mar 14, 2010
    Messages:
    5,380
    Likes Received:
    2
    Alright then I know I will be going with the 3hp engine when I'm ready for the nice FD, I just finished my home built one today, it is a 25cc 2 smoker and it has ZERO GRUNT..........pretty sad actually, but it is what it is and it does what it does, it will hit about 25mph on the flat wityh my 200lb butt on it so Iguess it will be OK on the pavement where it is flat,but hills kill this thing pretty quick.......

    Thanks for all the info. donutguy.

    Peace, map




     
  16. F_Rod81

    F_Rod81 Dealer

    Joined:
    Jan 1, 2011
    Messages:
    1,033
    Likes Received:
    0
    sounds good, I'll be building my 4 stroke here soon. I can't wait
     

Share This Page