Older vrs. newer Raw two-stroke.

Discussion in '2-Stroke Engines' started by oneninesixnine, Sep 18, 2011.

  1. I currently have the Raw 66/80cc (Raw SKU 80) that I destroyed (don't ask). I'm considering getting the newer Raw Black Slant 66/80cc (Raw SKU BS80). (I want the Grubee Skyhawk GT5R Super Rat but, can't find it.) What changes, updates and improvements does this specific Raw motor have in comparison to its earlier model and other engines? The only differences that I can tell is that it's painted black and has a slanted head. Please educate me. (If you know where I can order the GT5R, please let me know.:confused:) Thankyou. -1969
     

  2. motorpsycho

    motorpsycho Active Member

    more than likely the only changes are what you see on the outside...black paint and a slant head.
    I would bet that the internals are the same as the earlier engines.'
    I have no proof but i'm just making an educated guess.
     
  3. HeadSmess

    HeadSmess Well-Known Member

    see?

    its always the 66 with slant head thats died after almost no use :D

    and they always want to buy another 66 to replace it, in the hope it was just a one off lemon...

    stick with the 48's!

    the OCCASIONAL 66 survives. these are called "rarely used"

    i do up to and over 60km a day! 4-500 a week! so when an engine lasts 6 months of abuse, i laugh as i push it home!

    but when an engine dies the very first day? and then the second day? then the third and fourth, gives a week of respite, then daily from then on til replaced.... i get annoyed. :shout: see?

    i will never ever EVER get a 66 again. :) bigger is not better.

    thats my say :)
     
    Last edited: Sep 20, 2011
  4. 50cc or lower 2-stroke

    Headsmess or anyone else: What is the top speed of a 50cc 2-stroke or or lower, frame mount engine on 26" tires and the "middle" size rear sproket in miles per hour? Are the 50cc or lower really more reliable and last longer than the 66cc?
     
  5. motorpsycho

    motorpsycho Active Member

    you can't determine the top speed of either engine unless you know specifically what the rear sprocket size is.
    it also depends on how the carb is tuned, what spark plug you are running, the fuel-oil ratio, the rear wheel size, the rear tire size (height), rider weight, bike weight, etc.
    You can't just say " a 66 c.c. will top out at 35 mph and a 49 c.c. will top out at 16 mph."
    there are a ton of variable that will affect top speed.
    you can gear a 32 c.c. engine (for example) to have more top speed than a 66 c.c. engine just by the gear ratio.
    more top speed means less bottom end torque and slower take offs.
    you can gear one of these enignes either for top speed, or low end torque with a single sprocket.
    if you want the best of both worlds then you would have to look into a shift kit.
    My 49 c.c. 2 stroke, for example, has more top speed than my 66 c.c. 2 stroke. BUT, my 49 has an expansion chamber, high flow air filter, 41 tooth sprocket, 20" wheels, accell 7mm, spark plug wires, ngk spark plug, 20" schwinn frame, and i weigh 160 pounds. top speed is around 32 mph on that bike with ME riding it.
    My friend can get on it, and he weighs 180 pounds and the top speed drops to around 28mph.
    My 66 c.c. bike also has 20" rims and a 41 tooth rear sprocket, but it has a 24" tall rear tire(which technically whould give more top speed because it makes the gear ratio slightly higher). but it's an o.c.c. chopper frame which weighs more than my standard stingray. it has a modified long pipe (not an expansion chamber) high flow air filter in a custom made carb stack, accell plug wire and ngk spark plug. the engine has slightly more torque than my 49 c.c., but the bike itself weighs more so the top speed is more around the 30 mph range with me on it.
    but again, if my 180 pound friend rides it, top speed drops to around 25-26 mph.

    since i own both a 49 c.c. and a 66 c.c. i can tell you that both of my engines are pretty reliable and i haven't had any problems with either of them. (the 49 is 4 years old and the 66 is about 3 years old).
    BUT, i do not rely on them for every day transportation and i just ride them for fun.
    whatever size engine you buy and whomever you buy it from is a **** shoot.
    sometimes you get a good one, sometimes you get a lemon.
     
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