Top Speed, 80cc Chinese motor? what is the record?

Discussion in 'Motorized Bicycle General Discussion' started by scottcason69, Apr 26, 2013.

  1. mapbike

    mapbike Active Member

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    Thats great to know, I'm not sure if I'll be concerned about a silencer or not, I may just put an extention to get the outlet a little farther behind me and angled downward and see how that works for me.
     
  2. SpecializedMountainMoto

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    That's not even a real silencer, if u look into the rear it is just hollow with no fiber or baffle or anything, I only used it to support the thing and it looks way better but it is still loud as ****
     
  3. Davezilla

    Davezilla New Member

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    Definitely good news if it don't have to be modified... These things are tricky to weld partially because of the thin metal and also because of all the oil and suit inside the pipe that's near impossible to clean out completely..

    As far as the silencer s concearned, if you like it loud, it'll be loud without one... I got mine pointing to the ground and it still makes a good amount of noise, but most of that is what's reflecting off the road and at the rider...

    For the way these sound, it'll transform more to a true dirtbike sound which is a very pleasant note I must add
     
  4. SpecializedMountainMoto

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    Hey that's the pipe in your avatar picture huh
     
  5. Davezilla

    Davezilla New Member

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    Yup... Still hadn't changed the avatar pic, but I've been running the KTM pipe since august or september...
     
  6. LandSpeedRecord

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    Just went out and hit a flat, straight stretch next to my friends Yamaha FZ1. He kept pointing up and too the right every so often and I thought he was saying pull over so I would back off and then catch back up. Turns out he was pointing at the 40mph speed limit signs. He told me when we stopped we were steady at 40mph sometimes a touch over or a touch under but pretty much spot on. I just found my old Garmin Edge 305 and have it charging so I can back it up with the GPS. The 700c wheels with 35c tires give a taller gear ratio than 26s but I feel pretty good for hitting 40 on a 44 tooth rear and my first motor build still on th stock pipe and carb with mods.
     
  7. Davezilla

    Davezilla New Member

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    Not bad... not bad at all... What mods were done? if you don't mind me asking...
     
  8. dmb

    dmb Active Member

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    well it looks like baird is still the record holder. stock head,carb, no exp.chamber, backassward motor and that cool ocean air. same at the races sans the ocean air. he's always in the hunt with no aftermarket heads,reeds, big carbs, just his legs and a hot ass full leathers. pretty fun to watch, not so fun to try to beat him. dennis
     
  9. LandSpeedRecord

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    I spent hours and hours with the dremel porting and matching. Removed the stock air box and just have the filter element there. Stock pipe with the end cap removed and shaped at the motor to match the port, shaped the intake side of the piston to the intake port and removed a little more weight on the inner edge of the other side. Rubbed cutting oil on the rings, bearings, wrist pin, anything that moved and went out and pedaled the **** out of it with no spark plug and got the motor spinning as much as I could before ever starting it. Got the chain very lubed and aligned, put really slippery racing grease in the wheel bearing cartridges. High compression billet head, pretty much tried to get everything as efficient and balanced as possible. I have about 3/4 of gallon of break in pre mix run thru it so far. Oh yea, I soldered and drilled the stock jet.
     
    #129 LandSpeedRecord, Jan 22, 2015
    Last edited: Jan 22, 2015
  10. SpecializedMountainMoto

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    I believe bairco said he was using some exotic a50 head not stock
     
  11. LandSpeedRecord

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    I am really really enjoying this bike. I am excited to get a good exhaust and maybe a 36 tooth and more tuning.
     
  12. bairdco

    bairdco a guy who makes cool bikes

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    the fastest bike had an aermacchi m50 head on it. my race buke has an mm ashtray head, ktm pipe, and a 22mm mikuni.

    but my cruiser that topped out at 55 had an nt speed carb, straight plug stock head, modified gutted stock exhaust pipe with a supertrapp tip on it. and a 28t sprocket.

    you can modify a stock engine with really good results if you know what yoi're doing. plus, it was the grubee gt4 starfire. those engines had more power, way better quality control and we're a lot better than the skyhawks.

    too bad they arent imported anymore.
     
  13. mapbike

    mapbike Active Member

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    I've always admired your work baird, your ability to make your engines run so good without having all the fluff and snake oil on them is what sorts inspired me to tinker with mine, I've. Yet to have one that will run as fast as yours but I keep on learning and I like following you and a couple others on here who do things that work instead of thinking chrome parts equal speed and power, I've. Made a couple mistakes and bought into some hype but I just had to know for myself, we have straight shooters on here and we have some just out to make a buck on something that is a complete waist of time hope and money.....

    But oh well we live and learn.

    Map

    .wee.
     
  14. bairdco

    bairdco a guy who makes cool bikes

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    thanks map. :)

    it wasn't till last race season that i finally built up a bike with a bigass expansion chamber, carb, and afyermarket head. i had to do it to keep up with the arrow team.

    i was leading the first coupla laps in the final of the last ride til my pedal seized and fell off, and i had to pull off the track. wait'll this year!

    i always got a kick out of racing everyone with the stock, albeit heavily modified engine without all the bolt on goodies, but after 2 years of 3,4,and 5th places i finally had to cave in and build something to compete for first.

    i'd love to have a race class where all modifications are allowed to the stock kit, but it has to use the factory carb, exhaust, head, etc. no aftermarket parts allowed.
     
  15. mapbike

    mapbike Active Member

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    You're welcome...

    Yeah I have a KX65 pipe ordered and a 21mm Mikuni carb on order also, I have several engines and I don't know for sure which will get the new goodies to see what I can make it do, I'm gona do one up a bit different that I've done before at some point, I'm honestly not looking for 60 MPH on one of my bikes but I'd like to get better acceleration and cruising speed power up to the 45 mph range.

    The 50 mph engine I built up took a long stretch to get there but with a 24" wheel and a 30T sprocket it was turning around 8950 RPM's so the porting was working to let it breathe but I still dont think I had everything where it needed to be.

    I dont care to go any faster than that, I just want to have a quicker 0 to 40-45+ mph, if I can get that done I'll be happy.


     

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