Can you unbridled your 48cc engine ?

Discussion in 'Motorized Bicycle General Discussion' started by Samy48cc, Apr 19, 2010.

  1. Samy48cc

    Samy48cc New Member

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    Hi I am a French Student in AZ . i have lost my DL due to a F D.U.I so since a few weeks i am interested in building my own Motorized Bicycle so i can drive on the road and go to the University.

    I have a few questions first . I plan to buy a GRUBEE GT2B 48cc for the engine. Is it the best engine on the market ? and can i unbridled it ? so it can run faster.

    And i am planning to buy a 26" Micargi Rover GT Chopper for the bicycle.

    Do you think it will do it !! ?

    thanks guys ! and sorry for the grammar mistakes, still learning it . !
     
    #1 Samy48cc, Apr 19, 2010
    Last edited: Apr 19, 2010
  2. Prasinos

    Prasinos New Member

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    this guy with the big words......


    I wouldn't say these engines are "bridled" as much as they are extremely cheaply made. Don't get me wrong For ~130 bucks your getting a **** of a deal. like some moped engines which have a restrictive intake that allows the moped to pass regulations and still haul with minor modifications. This is not to say you cant get a small power increase with DIY mods and cheap upgrades.

    First things first, replace your spark plug wire(~$8), if your spark plug came with no nipple on it buy an NGK B6HS(~$4), its arguably the best all around plug for most conditions. This will really keep it from sputtering at higher rpms, starts will be easier and it will idle far better.

    If i would consider anything a bridle it would be the stock air box. Some of the grubees come with a red one which is not as restrictive, but if you get a black one drill a bunch of holes in it to take away some of the vacuum at higher speeds.

    Go with a fully synthetic oil(not a blend). -Increases all around engine performance.

    Increase your compression by removing your head gasket or base gasket depending on where you want your power. Remove the head gasket if you want a little more power all around. If torque is a big issue, remove the base gasket(it changes the valve timing in favor of low end torque). I say or because most engines will hit the top of the head if both are removed, but if you try it with both and the piston doesn't hit the plug or head (and your willing to take the slight risk) go ahead and take off both gaskets. If you want your engine to stay clean but some gasket spray, its about 8 bucks but
    its good stuff. I have no head or base gasket and my engine has had no leaks for 400 miles.


    Though it takes a little longer, matching your exhaust port with your exhaust flange using a rotary grinder or a file can help as well. If your really willing to dig into you engine you can match the transfer ports as well as the intake side.


    Just my two cents, 90 percent of my customers who buy 50ccs want to replace them with 80s after they try out my bike( i started with a 50 as well). They have at least twice the torque as the 50s and about a third more power even at the high rpm. And no cop carrys around a syringe to measure displacements so don't worry about the 50cc and under law.


    Either way your gonna love it.
     
  3. Samy48cc

    Samy48cc New Member

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    Thanks Prasinos.

    Escuse me i am a total newb in the world of Motorized Bycicle, and i moved to the usa like less than a year ago do i dont really know how cop works here. So you are saying that any cops is going to make the difference between a 48cc and a 60cc for example ? .
     
  4. Prasinos

    Prasinos New Member

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    No way, as long as you wear a helmet and dont be a jackass on the road, cops leave you alone. I have been pulled over once because in Virginia you need to have a windscreen type helmet. that was 8 months ago and i haven't bought a new one... still no problems though.

    in conclusion, they will have no way of telling what displacement your engine is as long as you remove the sticker on the side. Even then they normally don't care.
     
  5. twowheeledfox

    twowheeledfox New Member

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    One more thing: I always push this, but from talking personally to a cop here: make sure you have a proper helmet and working lights and a mirror. It is cheap and just good sense for riding in imperfect conditions and may stop you from getting pulled over.
     
  6. Samy48cc

    Samy48cc New Member

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    Thank you guys... i dont know if i will upgrade my engine to a faster cc because i am still scared to get pulled over and to be in trouble. And cops in Arizona are very very damn strict. But thanks for the info and advices !! :)
     
  7. twowheeledfox

    twowheeledfox New Member

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    Well, on the motors: if you get the "80cc" it is actually a 60-something cc motor, not what they advertise it as. The difference in piston size etc is definitely small enough that no-one could tell without taking the motor apart and measuring it. You should have no worries about motor size if you get pulled over and you will have more torque and a bit more power, which counts on these, especially if you keep it stock with the one-speed drive.
     
  8. Samy48cc

    Samy48cc New Member

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    thanks as soon as i have a cupple hundred bucks on the side, i'll order the engine. ( the main thing is that i dont want any trouble because as i said i do not have a licence but i still want to go faster than 25 mph. ) do you know how fast those 60cc engine goes ?

    Someone can advice me a bike or do you think the one i put in my first post is good enough!?

    i will use the Motorized Bicycle everyday to go to school its a 10 miles trip one way.

    thank you guys, this website is awesome.
     
  9. twowheeledfox

    twowheeledfox New Member

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    I would say $200 is a good amount. With that I would buy:

    80cc Motor and and Kit from ebay, I have had good experiences with a seller called "luckyearlybird", but ask around if you like. $130, free shipping.

    Walmart bicycle light set, front and rear, $30, plus batteries, $5.

    Walmart bar-end Mirror, $6.

    (Now we go into acessories, things that aren't necessary but make it easier to ride)

    Walmart sprung cruiser seat, $25

    and/or

    Walmart bike bag for tools or a spare tube

    Finally, if you are travelling long distances I would get a larger fuel tank, or a rear rack and an auxiliary tank.

    Even getting all of that, the cost should be about $210, minus what you paid for the bicycle.

    On speed, it should get around 30mph cruising, completely stock. Modifying the motor and maybe adding a smaller sprocket, among other things, could increase the speed but it requires time, money, or tools and sometimes all three. See the "high performance engine tips" section of the forum for help on speed.
     
  10. mapbike

    mapbike Active Member

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  11. Humsuckler

    Humsuckler New Member

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    i ran a cheapo centerfire first gen with no basegasket and was actually quite please with its increase....

    its all about measurement.


    in other words, if you dont know, dont guess. :)

    BTW i recently bought and built a 49cc pk. Dont like it one bit, its even more gutless than the 80's are off the get go.... just get the bigblock and be done :)
     
  12. mapbike

    mapbike Active Member

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    Yes I also say go Slant head 80/66cc with improved exhaust and just run the crap out of it, I use a 41T sprocket because of the hills around where I live and my bike does about 37 WOT and cruises nice @ 28-30MPH.
     
  13. azbill

    azbill Active Member

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  14. twowheeledfox

    twowheeledfox New Member

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  15. rockhopper

    rockhopper New Member

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    Hope-Dasher. Screw you and your common sense.

    hahaha
     
  16. azbill

    azbill Active Member

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    actually...
    some cops can tell the difference !!!
    there is at least one member here who is a peace officer ;)

    mostly I was bringing up the 20mph limit
    people have gotten hit for being a moped (no plate, insurance, license...big fines) :(
     
  17. Prasinos

    Prasinos New Member

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    Yea by valves i meant ports....

    And Map is right if you want to stay completely safe don't remove the gaskets. I can tell you, however that i have removed base gaskets on 3 engines and haven't had leaks on any of them (using the copper gasket maker). Head gaskets I almost always remove, normally they leak very slowly or not at all, but since i used the spray a gasket i haven't had any problems.

    My first engine was a Raw motors 50cc. I was extrememly happy with it untill i tried a pk80 on a freinds bike. I am converting my 15th bike today and i can tell you that even after 3000 miles that raw engine is the best 50cc I've seen so far.

    so if you are determined to stay legal, ideally id go with a raw, iv installed 2 Raws and 8 PKs, the PKs are inconsistent, both of the Raws are at least as good as the best pk.

    If you don't want to be able to go 20mph(???!?!?!??!)... Id still get an 80cc and idk epoxy a washer on the intake to make it 4mm id.

    like i said you'll be happy with whatever you get, Ive never had someone ride one of these for the first time and not have a smile on their face.
     
  18. Samy48cc

    Samy48cc New Member

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    azbill-> are you a dealer for EZmotorbike? there automatic clutch looks fantastic !.
    if you are well i think we are going to meet soon :) !

    Guys i think i am going to stay legal after the video i saw :

    EZ MOTORBIKE COMPANY
     
  19. azbill

    azbill Active Member

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  20. Samy48cc

    Samy48cc New Member

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    Awesome Bill,

    I have a few question for you if you dont mind.

    What is the differences between the EZM kit and all the other brands kit ?

    i know there is something like they are fully automatic or something, i don't really understand any technical word so i have a hard time finding what is different.( sorry ) But the video on the website with the 48cc at 40mph impressed me !

    Then i dont know if youy saw but at first i wanted to buy a Micargi beach cruiser GT for the bike, but after reading some post, i found out that their quality wasnt as good as it used to be. What bike will you advice me to put the engine on ? ( I really like Beach Cruiser Style )

    And of course, how much does the kit cost ?

    Thanks !
     

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