so... those 50cc bicycle engine kits....

Discussion in 'The Garage' started by Jayne, May 23, 2020.

  1. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    6 months ago I got the notion to get some sort of moped, scooter or whatever to replicate my childhood memories of riding around on the back of my great uncle's Honda Trail 50. I looked at those, zuma scooters, the honda ruckus, and some other stuff including those 50cc (and 80cc) motors you stuff into a bike to make your own moped. ultimately I got nothing.

    Last week, I was once again thinking about it, then took the plunge and ordered one of the $108 50cc kits off amazon. It showed up yesterday, and after spending most the day tinkering, I ended up with this:

    crazy_bike_motor_1.jpg

    My 1993 DB Ascent is now sporting 50cc of Chinese crap. The only real trouble getting it installed was the rear motor mount. The instructions say "go to the hardware store and buy longer threaded rods so you can mount it correctly". Thanks China.

    Those 'rods' are M8-1.0, so not exactly standard (M8-1.25 stuff is everywhere). I found 2 bolts and since they weren't fully threaded had to make some ghetto spacers I won't share pictures of out of old nuts and washers, but it worked.

    I wants 1:17 fuel for 'break in' for 500km. That's a LONG break in for something that can't go all that fast. I mixed up some 'almost 1:17', dumped some in the tank, started pedalling down the driveway and popped the clutch... damn thing fired right up.

    In about 150' the chain popped off the sprocket so I had to go back and tweak with the tensioner a bit, but after that I ended up riding around for about 15 minutes before stopping to let it cool down. It says not to ride more than 30 min at a time during break in.

    So it's impractical, kinda noisy and slow and you're basically running around with a chainsaw strapped to your bike, but it's really stupidly fun.

    I need to heat the exhaust pipe up and as the manual says "make it flexy" so I can bend it parallel with the frame so the mount will work correctly, but otherwise I think it's good to go. Not sure where, but it will go.

    Oh, and maybe figure out how to mount the rear of the chain guard that doesn't involve a zip tie. The manual says "use good zip tie!".
     
  2. fieldgrade

    fieldgrade resident crank Benefactor Charter Life Member

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    An ounce of image is worth a pound of performance.
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  3. NCLivingBrit

    NCLivingBrit Clueless Protoplasm

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    I've watched a bunch of YouTube vids on these things and some of them got pretty good results. I know the ones with more displacement (not a motor guy so I may be wrong) will send that bike fast enough to be pretty lethal if you come off.
     
  4. Carolinatlc

    Carolinatlc Member Charter Member Supporting Member

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    Ok, I’ve been in purge mode recently and have given tons of stuff away around the house. All the bikes the kids have outgrown are now gone but I’ve held on to some even though they are not ridden. I now have a project for my sons old Cannondale which used to be my old bike.
     
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  5. Geezer

    Geezer Mama Tried Staff Member Benefactor Charter Life Member

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    OK, you can now make it go. Will you be able to make it stop?
     
  6. Alfred

    Alfred E. Deplorabus Unum Supporting Member

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    Does it have any grunt going uphill ? Or only useful on a flat road ?
     
  7. Ferrisfan

    Ferrisfan Got here as soon as I could Supporting Member

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    I want an e-bike for many of the same reasons, but I can’t imagine that I would use it enough to justify the cost.


    Good on you for finding a good fun per dollar option!
     
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  8. HMP

    HMP Well-Known Member Supporting Member

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  9. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    Minor grunt, haven't had to pedal to assist it going up the road by the house but I can see on some larger hills it would run out of steam.

    Did a 'speed test' today, got it up to 16.9 mph according to the GPS tracker. Woo!

    It's breaking in though, I'm noticing it's smoothing out and actually responds to throttle inputs a little. It's still sorta low/medium/high settings rather than fine throttle control but at least you can crank it full open and it won't die. Won't go very fast, but won't die.

    Each little round trip is 1.7 miles according to the GPS track, so I've got over 9 miles on it so far. :)
     
    Last edited: May 24, 2020
  10. SPST

    SPST Member

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    Do your bicycle gears still work or is it just a one speed now?
     
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  11. Infamous1

    Infamous1 Well-Known Member Supporting Member

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    Only 300 miles left to break her in!!!
    Do you think the 80cc would be a better option? Wonder how quiet you could make it? I would not want it to draw attention while puttering around.
     
  12. Carolinatlc

    Carolinatlc Member Charter Member Supporting Member

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    I thought I posted in this thread last night but don’t see my post. I did break open a bottle of Woodford yesterday so who knows. I’ve been purging around the house recently and have given several bikes away. I kept my sons bike that he doesn’t ride anymore which was one of my old Cannondales. This looks like a fun project so I ordered one of the kits. Hopefully be here soon so we can play around with it.
     
  13. Alabamacoastie

    Alabamacoastie Well-Known Member Puddle Pirate Life Member

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    Im no engineer, but looking at the pic... It looks like the bike gears will work when pedaling, but the engine only has one big gear for when using throttle.
     
  14. kcult

    kcult Alcohol fueled dumbass Charter Member Supporting Member

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    And I thought I did something by putting monkey bread together just now.
     
  15. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    The bike gears and pedaling are separate from the engine. When you pull the clutch in (and it has a lock feature to keep it disengaged without having to hold it) it's just like the regular bike and everything works the same.
     
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  16. Alabamacoastie

    Alabamacoastie Well-Known Member Puddle Pirate Life Member

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    Still waiting for covid to go away so we can hang out. I wanna taste some monkey bread.
     
  17. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    My thread double posted, so it's probably in the other copy.

    You might want to source some M8-1.0 threaded rods ahead of time so you can skip the "go to the hardware store" step in the instructions:

    IMG_7613.JPG

    Then again, the kits all seem to be slightly different, so who knows what yours will have.
     
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  18. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    Define "better". I went the 50cc route because it was the cheapest option, and I honestly didn't think it was going to work so I wanted to minimize my cost of failure... and now that I'm riding around on it.... this thing is plenty fast for the ill handling no suspension bike it's bolted to. 80cc would be faster, and the added torque would be handy on hills... but it's totally not street legal or anything so how far could you possibly go? If you had tons of off-road area to play in, even one of those little 50cc kids dirt bikes would kick this things butt with their suspension and variable gear ratios and such.

    If I want to go fast, I'll just use the actual motorcycle in the garage. If I want to annoy the wife and dust the yard for mosquitos at the same time... then 50cc is enough.
     
  19. Oneofsix

    Oneofsix bag of mostly water Charter Member Supporting Member

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    I saw your post last night... weird.

    Sent from my Pixel 2 using Tapatalk
     
  20. kcult

    kcult Alcohol fueled dumbass Charter Member Supporting Member

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    How about one of those form 1 Chinese fuel filters minus the form one?
     
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  21. Jp8819

    Jp8819 Member Benefactor Charter Life Member

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    Co worker has couple bikes he added these to and he really likes them for small foot print and weight packing in his camper since he goes to daytona races every year and uses them going back and forth to track.
     
  22. HMP

    HMP Well-Known Member Supporting Member

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    @
    There were 2 threads. It looks like @Jayne created two threads 3 minutes apart for the same thing. I mean, same dang first post.
    https://www.carolinafirearmsforum.com/index.php?threads/so-those-50cc-bicycle-engine-kits.62657/
    So, yeah, you posted in 'this' thread...but not 'THIS' thread
     
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  23. HMP

    HMP Well-Known Member Supporting Member

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    @Geezer can you merge the two threads?
     
  24. Goofyfoot2001

    Goofyfoot2001 Member Supporting Member

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    Built the 80cc. Not sure what the real spec is. It had no problem with most hills and I could get 27mph no problem. It needed constant tinkering though. Finally the carb just would never get right. I bought a kawasaki instead and it worked better and could go 100mph.
     
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  25. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    When I posted it didn't work, it just hung there. I just let it sit there while I did something else and it timed out. Then I hit "post" again, and it worked immediately. But it also looks like it worked the first time, just didn't tell me about it (or the browser).
     
  26. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    I'm afraid of heating up the exhaust pipe and bending it to run parallel to the frame as the manual suggests, so the pipe was just hanging off in space only supported by the two bolts in the manifold. Since the provided bracket was nothing more than a 1/2" (at best) piece of strapping, I grabbed a longer piece of 1" from the barn and made a highly custom exhaust mount:

    IMG_7633.JPG

    I re-used existing holes in the strap which is why it's a litlte wonky but it was easier on my drill bits to not have to go through the strap twice for each hole. If it stays put over a few test runs I'll pull it and paint it black to match (I have high temp black paint).

    It looks nasty, but it's actually pretty solid.

    Also did something the manual would never mention, used some wire loom, electrical tape and zip ties to actually secure off the electrical bits such that they are. The "mostly covered" connectors were probably not long for the world as shipped by the manufacturer.

    IMG_7634.JPG

    Made a couple more test runs as well, actually ran out of gas on one of them. The 3 position petcock isn't just a cosmetic item, there is actually a reserve setting that works. Glad I didn't have to actually pedal my way back to the house in defeat, that would have been embarrassing.
     
    Last edited: May 25, 2020 at 8:52 PM
  27. SPST

    SPST Member

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    How much weight does it add to your bike?
     
  28. BigWaylon

    BigWaylon Head philatelist Staff Member Benefactor Charter Life Member

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    I got it. And deleted the dupe OP.
     
  29. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    ~23 pounds. The package was just over 24 and everything in it is on the bike. Ah, plus fuel, so maybe 25.
     
  30. SPST

    SPST Member

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    My entire bicycle only weighs 18 pounds! I'd hate to have to pedal that up a hill if it runs out of gas. On the other hand, I bet it rolls downhill pretty good.
     
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  31. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    I've done enough laps of the neighborhood now that I've gone from the neighbors smiling and waving to shaken heads and disapproving looks. The engine is clearly breaking in, it's got more, well I hate to say "torque" because we're talking minuscule numbers here but it feels like more. You can go from 1/4 to 3/4 throttle and actually feel it go faster. If you just hit WOT it sorta grunts and stumbles, but backing just off a bit from there it actually moves.

    The idle adjust screw is very twichy, but I have it now where it will idle when you pull the clutch in vs. just race to some crazy RPM. Well most of the time anyway. Sometimes it still runs away a bit.

    I'm half (or more) tempted to toss it in the back of the truck and find a school parking lot and see how fast I can go on flat paved ground. I mean, they're not using the schools now anyway, so some Bonneville testing would be a viable use of that resource.
     
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  32. JimP42

    JimP42 Mostly harmless Benefactor Charter Life Member

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    The main Wake Tech campus on 401 south of Raleigh has plenty of space, and the entire MSF course tracks painted in the outermost lot. That's where they run the courses locally.
     
  33. BowWow

    BowWow Happy to be here

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    I saw one rigged up on a kids scooter........that thing would probably do 20+ mph.
     
  34. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    Ah good idea. Lines and stuff to test my skill against.
     
  35. Windini

    Windini SWDD Charter Life Member

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    Safety First! Go prepared:

    Safety first.png
     
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  36. Jp8819

    Jp8819 Member Benefactor Charter Life Member

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    One must add a a turbo before doing speed test, You clearly have not spent enough money on this project yet!
     
  37. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    I need something more early-90s to match the bike's era. Does it come in mauve?
     
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  38. Jayne

    Jayne Just here for the memes Charter Member Supporting Member

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    Holding steady at my $122 total investment.

    I have to work on my exit strategy next, do I pull the kit and sell it or sell the bike with the motor on it?
     
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  39. SPST

    SPST Member

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    Nitrous bottle should be next.
     
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  40. RedneckFur

    RedneckFur Smith & Wesson is a religion of peace. Supporting Member

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    The crazy thing is, they actually do make a kit for those little strap on motors.