Finally Got my Japan Chopper Going!

Discussion in 'General Questions' started by inspectorcritic, Sep 4, 2016.

  1. It's the GT 80 4.5 HP ported 66cc but I'm still worried I had a Shanghai chopper it grinded it's guts out took out spark plug while my finger around aluminum dust this one sounds like it's grinding too! I hope to f*** got enough oil in the gas. The f***ing CNC carb falls off no matter how one tightens it, it will fall while tightening I solve it so far by tying it on with shoe lace can you believe it. I took a 20 mile bike trail test it did OK pulled me up some steep hills it was beautiful there haven't seen such beautiful scenery in years the AF Academy trail. It only does 22 MPH but the German Schwinn built for top speed 21 get to 22 start getting scared death wobble so it's a WWII alien bike does it have meaning we were suppose to be?
     

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  2. Frankfort MB's

    Frankfort MB's Well-Known Member

    What is your oil mixed at? Should be around 32:1
    I use nothing but full synthetic echo 2 stroke oil
    What size sprocket do you have??? If your only hitting 22mph there is something wrong unless you have a very short gear
     
  3. I'm running 16:1 for first 3 tanks then 20:1 I can't believe you would ever suggest 32:1 that will burn your motor out dude and the gear is stock I think it's 44 and the max speed for a bike is 21 MPH to go over that just 1 mile it gets scary you can feel a death wobble coming on been to 26 though got speedometer now either people are lying when say 45 MPH although they can by changing flywheel my 4.5 would fly me down am freeway has enough muscle but ain't safe don't wanna die!
     
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  5. Look what happen to this poor fellow biker with a shady side.
     

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  6. jatgm1

    jatgm1 Member

    so i can safely assume you smoke crack?
     
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  7. CrazyDan

    CrazyDan Member

    It would seem that way lol. How balanced is your rag joint? I've been 43 with no death wobbles, something isn't right. What rpm are you at when you're going 22 mph? Bet it's under 5k with that 44 tooth. You have adjustments to still make.
     
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  8. Frankfort MB's

    Frankfort MB's Well-Known Member

    Ive been 40mph on a 75 year old bicycle and it is perfectly fine

    If you do anything that involves a motor bicycle it's not safe.... Common sense

    You don't know 2 strokes apparently....
    Too much oil is as bad or worse than too little
    Just about every about everyone that have built these things and gotten them too last will recommend 32:1 ratio
    I've had a bike that I run nothing but 32:1 full synthetic for 750ish miles and it was still running perfect
    You should be going faster than 26mph. I would be pissed if that's all I got out of it
     
  9. butre

    butre Well-Known Member

    I regularly put over a thousand miles on cheap top ends that I've ported to break 50 on balanced bottom ends at a 50:1 ratio. there isn't a motor in the world that wants a 16:1 oil mix.

    if you're getting death wobbles at such a low speed I would say your wheels, tires, alignment, or possibly frame geometry are suspect. I can hit 25 just pedaling with no weird wobbles.
     
  10. CrazyDan

    CrazyDan Member

    Thats all I get out of my 53cc 4 stroke :(, but I can do the very steep foothills in my town below Big Bear without pedaling, although I pedal uphill to stay at max rpm (top speed)...Having to change my clutch every 2 weeks because I wanted to do 35-40 got me pissed :p.
     
  11. I called a few bike motor business the only thing they told me agreeing with other break in 8 ounce to 1 gallon after 3 tanks 6 ounces to 1 gallon. It sounds insane to use the method why do 4 stroke use an oil resolve? Why make a 2 stroke to begin with? Why not 4?
     
  12. Got burned today yesterday took my static schwine to REI to put suspension forks on it cost $137.00 cuz its an old classic collectors schwine has threaded tube got on it to ride away into sunset notice when I sat on it brake calipers open up weight on bike compresses causing slack no brake took this 43 year bike mechanic vet and me hour to figure out needs just like other Mt. bike liner brakes he got me good deal used 15 bucks. He used old brake pads that work to well don't know brand but gonna get them for rear well I took a corner hit the clutch then the brake grab so f***ing hard brought the bike down to break my leg as I hop around for control my leg I was wearing short touch the motor for 10th of a second instant third degree burn blood flows out never had a burn like that went on my errand to store told female teller she says, oh dear I'll get you some bandages there blue, my hard hat is blue this morning at my hotel I'm staying by almost hundred mile bike bang on my door says, we are going to paint your door ... Guess what color BLUE!
    Well I'm thinking of buying a steel bike basket make a heat cage ... Does anyone have any expertise in this area?:)
     
  13. wow that is a sweet ride 22mph is fast enough for me!
     
  14. jatgm1

    jatgm1 Member

    2 stroke engines detonate every time the piston is at top dead center, delivering more power. they can do this because the lubrication is in the fuel. per cc 2 stroke is more powerfull. and when your restricted legally by cc's thats what you want. 4 stroke detonates every other time the piston is at top dead center. because one of the times it expell's exhaust. and the lubrication comes from the crank case where you pour oil. the oil "reserve". 4 strokes use valves, inherently. two strokes dont have to. 4 strokes are limited by the speed a valve can open and shut, and by multiple other factors due to their design. the way you get around this normally is by having a larger displacement, more cc, but you cant do that on a bicycle legally. not to mention 2 strokes are easier to work on, their are less parts, its a simplistic design. also, two strokes were made before we knew we could make 4 strokes, thats why we made them in the first place. if you dont want a grubee get a big ole 4 stroke and figure out how your gonna get the pedals to clear, then you'll know exactly what i mean. and the 4 stroke engines you get are still under 50cc and less powerfull than the small 50cc version of the 2 stroke grubee skyhawk. and most people have the 66cc version. which fits fine on a bicycle, since their are close to no parts in comparison to the 4 strokes.
     
  15. jatgm1

    jatgm1 Member

    also, its much easier to read things when their is punctuation.
     
  16. KTOKTO

    KTOKTO Active Member

    Holy mother of crap, what is going on here.

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  17. jatgm1

    jatgm1 Member

    im in full agreement. i would be glad to help with any problem he may have if i have the ability though. speaking of which, four winds is a good place for psychiatric rehabilitation or drug related rehabilitation. if you give me your zip code i can attempt to either find one near you or something comparable. both drug addiction and mental health issues are both quite serious, and if the reason you have a motorized bicycle is because your drivers license was taken away, i would strongly urge you to refrain from riding your motorized bicycle until your license has been returned. my aunt is bipolar and i wouldn't get into a car with her off her medication. the same goes for use of narcotics while operating the bicycle. i opened my arm up pretty good sober and of sound body and mind, these devices can be temperamental and you need your wits about you when riding them. if i wasn't paying attention just yesterday i would have had a larger problem than my pants getting sucked into the engine via the chain and skidding to a halt.
     
  18. Fast enough for me too I use a speedometer those other guys who say they are going 45 to 55 MPH I question after 21 MPH it gets scary the bikes with the frame diameter are design tto speed 21MPH ever look at at a motorcycle see the frames are about 8 inches around bike is about 2 inches.
     
  19. jatgm1

    jatgm1 Member

    ive clocked my bike at 36.7 mph by gps, and it felt fine. if you have a bicycle that is manufactured poorly or the design simply isnt good for a bicycle than i could see there being issues, however with a bicycle that is well made you should be fine. if your wheels arent straight you might have a problem, if theirs play in the steering for some reason or your tires are messed up, you might have a problem. if i had front shocks it would work even better, that could help with stability issues, getting a better handlebar could even help. not to mention theirs a video online of someone with a chinese grubee crankcase and a puch cylinder speeding along at over 45mph, he was actually passing people. so its definitely possible if you do it properly. depending on the bike though it might be more challenging than its worth to do it. i keep up with traffic decently when im riding and the speed limit where i ride is 30. consider looking into either a better bike or higher quality parts.
     
  20. I got a good bike its a Schwine Panther bike I just don't like driving over 21 MPH cuz it frightens me unless there is a bear chasing me.
     
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