80cc

  1. C

    Porting Fist Time Struggles!

  2. B

    Performance loss .... HELP !!!

    So it all started when a screw for my exhaust broke inside the cylinder I tried to remove it every way possible, sadly it didn't work. I then got a replacement one online, when installing it I tightened it to much to the point that the cylinder head cracked. Unaware I tried to ride it and ended...
  3. 6

    What else can be done to maximize shitty Chinese engines

    So far I’ve replaced every shitty, self stripping nut and bolt I can. I live in the US so finding metric bolts is sometimes a challenge. I reinforced the engine mounts and chain guide and placed make shift rubber shocks between the frame and the engine to stop it from shaking so hard the chain...
  4. M

    Chain rubbing cover

    Hey! I've been perusing these forums for the last month or two and finally got my first 66cc kit in the mail today so I figured I should finally join in. Anyway, upon mostly installing my kit(for the life of me can't find an Allen key to move my stupid twist shifters) and noticed the rear wheel...
  5. E

    80cc Motorized Bike vs 1000w Ebike

    Hello, I've recently ridden a 80cc motorized bike and loved the acceleration and speed. I've always wanted a ebike though, as it can hopefully keep the cops off my back. I was wondering whether anyone has had experience with both and could tell me whether they're relatively the same. Thank you.
  6. Ollie White

    Engine not starting, despite fuel and spark

    My 80cc engine from China (eBay) has not started since it was assembled a week or two ago. Fuel is getting to the engine, as the spark plug was wet when checked after cranking - for some reason it refuses to burst to life upon releasing the clutch. The engine will turn over after releasing the...
  7. M

    Engine Trouble Low power after remounting engine to new bicycle

    Quick story Old bike frame broke while riding. The frame had snapped right above the rear mount due to a small crack that got worse after a month of engine vibration. (Vibration isn't bad, I used the frame with knowledge of the crack) During my ride the back wheel seized and I slid to a stop...
  8. M

    Break In New 80cc break in weird noise + low performance?

    Hello all, So I am relatively new to the MB scene and to this forum but everyone here has been a great help. So I bought a new 80cc engine off eBay (just a basic kit engine). I know these engines require a break in period but i have a few questions. Here are my specs. 100:1 Opti2 C Clip is in...
  9. M

    New Engine Questions

    Just bought a new 80cc engine online. Bought it from ebay, its a basic 80cc/66cc (Jet) engine. Ill post a link to the engine on ebay. I Was wondering if you guys have any tips for me regarding break in or assembly. I was thinking about breaking in with Opti2 at 100:1 but open to suggestions...
  10. M

    New 80cc no start.

    Hi all. I finally got my 80/66cc engine installed on my 24in road master. So far its been a big job finding and making stuff work. The carb had to sit at a 45 degree. The muffler was hitting the pedal and needed bent slightly. The chain had to be shortened and the funky rear sprocket to me a...
  11. The-DMV

    How do I get these engine bolts off??

    This is my first build, and I bought this engine second hand off craigslist. The guy said that it had never been run, but I'm wondering how I get these head bolts off. It's an upgraded head, but how did he even get it on there?
  12. J

    66cc fito jackshaft street cafe

    Because I'm too lazy to repost all the pics and info heres a copy of the craigslist add: https://westernmass.craigslist.org/mcy/5911031367.html Trying to upgrade to a project motorcycle and I've already sunk too much time and money into this this guy. Extremely fun work commuter though!
  13. WildWillis

    WARNING: DO NOT BUY CHEAP CHINESE MOTOR

    THIS IS A WARNING IN WHY YOU SHOULD NOT INVEST IN CHINESE MOTOR (COMING FROM EXPERIENCE) Okay, I bought a cheap $130 motor off ebay. Casting is horrible, quick and cheap/defective. Please look for good casting (highlighted in picture below). BUY OFF QUALITY TRUE SITES SUCH AS ZBOX if your from...
  14. fasjake

    i need opinions on a kit....

    I was looking at the gt6 pro racing kit on gasbikes. Looks snazzy, but i am a complete newbie to the hobby so im not quite sure what to look for. Any opinions or comments about the kit would be appreciated. Also open to suggestions of other kits.
  15. Scoobertino

    Engine Trouble Honda NH80 1985

    So I have a 2 stroke Honda from 1985 that I can't seem to get to run I drove it just fine and then one day I ran out of gas and I couldn't get it to start up after I put gas in it it finally started up but then sputtered out and I haven't been able to get it started ever since it gets dark it's...
  16. 2

    Any video ideas post below

    https://www.youtube.com/channel/UCO17lH0_XM1EtcDyXn9Yofw
  17. 2

    IF ANYONE HAS PROBLEMS WITH THEIR TWO STROKE LIKE MY CHANNEL

    https://www.youtube.com/channel/UCO17lH0_XM1EtcDyXn9Yofw
  18. 2

    Motorised Help Guides!!

    If anyone need any help look at my video it may help
  19. Mp2003

    Bike too slow

    About a week ago I bought a 2-stroke 80/66cc bike kit. I installed it and after startup problems at first I managed to get it running smoothly, the only problem is, it is way too slow. It struggles to stay at 20mph with the throttle wide open. I checked the carb and the throttle runs fine, so...
  20. Sitherus

    Expensive kits

    Im out of commission until i get brakes but while i was browsing for parts on ebay, I found this http://www.ebay.com/itm/NEW-80CC-2-Stroke-Motorized-Gas-Engine-Motor-Kit-For-Bicycle-Bike-M-EN05-/251218007344?hash=item3a7dc29530:g:FLAAAOSwQItUCN7G It baffles me on what kind of person would spend...

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