top speed please.

Discussion in 'General Questions' started by philcred, Jun 17, 2007.

Tags: Add Tags
  1. philcred

    philcred Guest

    can you post your top speed and engine cc as i just want to get a rough idea of the speed these engines do.
    thanks phil

  2. locoWelder

    locoWelder Guest

    69.7cc with ported intake and ext with a 36 t sproket on lovekin bl (4 miles flat) took 2 miles to get to 47 mph
  3. philcred

    philcred Guest

    ported head

    who ported your head.
    did you notice any diffrence.
    your size sprocket is ideal for top end and take off.
    mine does bog down a wee bit on take off but i had no choice. it was use a 32 took sprocked or loose the rear disc brake.
  4. Torques

    Torques Guest

    You are a crazy man! :shock: :shock: :shock:
  5. locoWelder

    locoWelder Guest

    I do most of all my own motor work I dont have a lathe to do any turning but the rest I do myself
    yes I do notice a differance in the overall preformance,but I dont engage the motor unless I'm peddling atleast 12 to 15 mph
  6. bamabikeguy

    bamabikeguy Active Member

    25 cc Zenoah- out of the box 34-35 mph using the 13 tooth highway gear.

    Neighbors clock me with digital speedometers doing over 40 going down the steep hills, 28 going up the same hills.

    I'll have a report on the 33 cc Tanaka sometime next week when it arrives.
  7. philcred

    philcred Guest


    i need to do mine right now.
    i wont be able to sleep now.
    were can i buy a turbo from. lol
    cheers loco

    bama do you have any pics of your ride.
  8. Guest

    Guest Guest

    34.6 mph as recorded on my GPS, the engine was not happy! It's a bone stock (even the exhaust baffle is all there) 70cc Dax.

    44 tooth sprocket.
  9. bamabikeguy

    bamabikeguy Active Member

    Hmmmm, I might be able to find one around here somewheres......

  10. philcred

    philcred Guest


    Joe that's good speed for a stock engine.
    I am only doing 10 mph more and I have changed everything.

    A stock scooter (moped) Peugeot speed fight 49cc will do 50mph + and they weigh a hell of a lot more they my bike.

    I can not understand people saying I am mad thinking I can get 46 mph out of mine.

    Bama have you got a magnifying glass so I see your pics. Lol

    I love the zenoha engine I used them all the time in my 5th scale r/c cars
  11. SlicerDicer

    SlicerDicer Guest

    these chinese engines are not built for speed... However I am going to be doing a gearing system with my 70cc then soon upgrading to a 135cc engine. I should be able to pull somewhere around 40mph tops even with the big engine... I do not want to go faster :shock: :shock:
  12. Guest

    Guest Guest

    Re: speed

    Yeah, that was down a very slight hill and with a tailwind.....the engine was SCREAMING and I did it once. I can see 30-31 mph regularly on the flat with no wind and the engine sounds as if it might last for awhile like that's a more realistic top speed for the Happy Time engine.

    The Speedfight will go that fast because it has a much higher redline and a CVT transmission.

    Ours are "stuck in 3rd gear" and have around 6000rpm redline.
  13. JosephGarcia

    JosephGarcia Guest

    no one beleives me, I dont expect them to. I got my engine used witha few modifications done to it, when installed on my mountain bike frame it pulled 45 easy, not screaming. for many streets at a time.

    Now, its topping out at 30

    I got an exhuast crammed up with carbon, a dirty fuel and air filter, and worn down clutch pads that barely grip anymore

    actually, after the last 25 miles i put on the bike today, the last 3 it was topping out at 20, this is all my clutch. cant wait for my new one.
  14. Kielohawk

    Kielohawk Guest

    I think not disengaging the engine on steep downhills and pulling high RPMs where the engine is at max thottle going 34 MPH and actually keeping the bike slower than it wants to go was the downfall of my upper arm bearing and caused it to go out. When I get my bike going again, I am going to start pulling the clutch in and coasting down the steeper hills. I had a Power King 80 with a 44 tooth sprocket and I was able to cruise at 28 to 29 MPH easy. Max throttle gave me about 32 MPH. With under 300 Miles on my engine, the upper bearing shredded on me and tore up the upper half. Piston, cylinder, rings all bad. I have since put a 36 Tooth sprocket on and have switched to a Dax 70 (the dax 70 piston is even a tad bit bigger than my PK80 cylinder!!). Thatsdax is sending me a good cylinder for a used engine he just sent me. It's interesting to see the differences between the 2 engines. I would love to cruise at 30 with lower RPMs. (The reason for the 36T sprocket).

  15. SlicerDicer

    SlicerDicer Guest

    I always coast down hills I dont like the sound the engine makes.
  16. lotsa_mpg

    lotsa_mpg Guest

    Bike #1 Cruiser style with DAX 70 will do about 32mph any day, and will occasionally wind up to about 38 mph...has 44 tooth sprocket...engine is well broken in and completely stock

    Bike #2 Same set as above except with Power King 80 not yet broken in...I've had it going about 28mph or so for short bursts, but haven't held it open long enough to really know what it'll do because it is still new. However, it does not feel quite as spunky as my Dax 70 did when it was new.

    Bike #3 Same bike exactly as Bike 2....not fully broken in yet...not sure if it ever will be cause it's a gutless wonder...I've tried everything I can think of and I can't get it to pull 22mpg on the level...and the slightest uphills require me to pedal.

    Bike #4 Chopper style with 20" wheels, Dax 70, 44 tooth sprocket....lots and lots of low end grunt because of the small wheels...will top out about 25 mph, but vibrates a fair bit at anything above 19 mph...not the engines fault at all, it's just geared too low and wants to overrev because of it. It would probably be perfect if I installed a smaller rear sprocket

    Bike #5 Sekine 10 speed road bike with Power King 80....very similar performance to bike #1
  17. lotsa_mpg

    lotsa_mpg Guest

    Ok, who fed the steroids to my Dax 70? I took it out today and it was totally nuts. I had the speedo showing well over 40mph. I even passed a gray haired lady in a Ford Focus. I stopped to check the engine over....thinking that I may have developed an airleak at the intake or head resulting in a lean condition (they always run best just before they blow). Checked the plug color and it was a nice light brown, so I kept riding it. I put over 35 miles on it and it never missed a beat and the newfound power remained. Must have just been ideal air temperature and pressure today, I guess?

  18. SlicerDicer

    SlicerDicer Guest

    My Dax 70cc topped out a 34mph downhill. I cannot get it to go faster than that. Well yet anyway :) Once I get the jackshaft done it should be able to hit 40mph.

    I am having issues I killed my metal drillbit so that sucks but other than that I will get it done.
  19. Stertz

    Stertz Guest

    got my chinese 48cc up to 50kph (31.068miles) along the a flat section of road. Still a little room for inprovment.
  20. FatPete

    FatPete Guest

    Bog standard 48 cc Howell. now nicely run in 34mph slight downgrade, 30/31 on the flat. Minus point, big fat bloke on the saddle. Haven't calculated the CdA of my beerbelly, can't get through the door of my local wind tunnel center.