1971 I bought old school 80 cc Yamaha dual sport. Had leveled sprocket on front of .aon rear sprocket. In trail mode it would do forty-two mph with my friend 140 # and myself 130 # on flat trail. 38 mph up grade. I never tried in street mode since it required license. Suffice it to say it was quite powerful for 80cc. It had lights in case wanted to license and it weighed 190 #. So with two people our small size it was hitting on 450#. I find that amazing.
I was one of the original importers of these motor kits 20 years ago and have built well over 100 for customers. I recently just built a.light 29" wheel cruiser and it hits 48 mph . You gotta know a few tricks to these things to get the most out of them Make sure to gasket seal where the carb slides on , shorten the chain and get rid of the junk tensioner move the carb needle up one notch . I'm gunna port the head and put and aftermarket exhaust on today and should easy hit 50mph. The high pressure 29" wheels really helped the gearing also adjust the wheel hub bearings . The rear hub will always eventually blow up just from the torque the.mortor puts on it
If you feather the clutch from a dead stop it will work with some practice . But I avoid this because it’s just more wear on my clutch. I try to help the clutch out and pedal a little to have less time before the clutch locks in
wow i was expecting more . i got one in my shed ive had for years it topped out at 28 miles a hour . i got a new one im working on here and there . its a 80 cc . might have to break down and get that 36 tooth sprocket if it only does 24 . i dont mind slow but holy cow . was hoping for more . nice looking bike though . beats pedaling . take care ride safe .
Thanks for watching and subscribe! I actually have been running it with 40:1 mix gas, but it’s supposed to have 20:1 in it. So maybe that will help a little but not much
You definitely have a problem , probably fuel mixture is off (jetting in carb). You can hear it doesn't sound right at full throttle. If you backed off the throttle it might do better.
I'd go with a Predator engine rather than a 2-stroke, that pollutes far more than then a 4-stroke that lasts longer and sounds way better too!@@Drive315
Something's really wrong, that thing would be able to spin twice as fast. Make sure your throttle is fully opening, mess with jets in the carb and see if it changes anything, just go over and check everything to make sure you're making full power. 40:1 will make you more power than 20:1 so it isn't that. my 79cc 4 stroke does 38+, you should be able to get that out of your engine too.
When i was a kid i always wanted to build this. I had one of those 90's Official Harley Davidson Chopper Bicycle with fat rear tire like a motorcycle. But it never worked out so i sold it. 6 months ago i bought a Broken Jetson Bolt Pro and after fixing it up and replacing the electric motor to 500 watt. I'm getting 25 MPH and 40 miles Range with pedal assist. I have good low end torque with 40 Volt Battery 6 AH
Those 360 cameras are amazing! Wrecked mine and it was 1 month +$160 to get one lens fixed :( ... Buying lens protectors this time, stitch lines be damned! Only up side was it recorded the crash lol Nice looking bike man! Ride on builder.
or just be lucky or find a good producer of the engine and on stock it will go 35-40mh atleast thats a top speed of mine on stock maybe its cuz moretti does a good job at making those engines
@@tbone8839 Lol i chucked that stupid bike and got a 1000watt fat tire ebike couldnt be happier. now my shit works and i still top out at 33mph. with a 48volt 20ah battery!
My first 48cc, bone stock did 37 "with the wind at my back" after break in. The best you can hope for is a reliable 30mph... The sweet spot on the sprocket is a 40 tooth. Middle of the road between low end and top end. Stick with the stock NT carb. Put the needle clip to second notch down. REMOVE THE AIR FILER...yes entirely. no filter at all. 4oz of 2 stroke oil to one gallon of gas. Get an NGK B6HS Spark plug. Ride it like you stole it.
I almost 😅 ran into traffic going 18 mph any faster and I would dead ☠️ ran over by a truck 🥹don’t underestimate the bikes speed and power be careful respect the bike
couple things if ya don't mind drive, the shaking that starts up at a certain speed could be coming from bad tires(I run kenda flame tires) or from rims not straight......second, if your running the stock 44t gear, upper 20's on the speed would be about right but with your weight, probably got ya down to 23-24 mph.........I use a huffy cranbrook also, 80cc, NGK coil and 36t gear, I'm 140lbs and mine will run 43 mph.... hope I was helpful with this info.......
My personal preference is for the 4 stroke engines. Top speed is maybe 25 at most. True 49 cc so legal almost everywhere. Loads of fun at that speed and do you really want to go faster on a bicycle?
I have a zeda 80 triple 40 you need to check and possibly clean them cnc high compression head and a mz65 clone expansion chamber pipe and Silencer and I can get 30 to 35 mph wide open and I weigh 250lbs the engines need a little love but your right there a lot of fun looks good keep biking stay safe
You should be able to get more out of that engine... Mine does 22 uphill with all of my gear and my 215lbs.. something is wrong, either the carburetor or some kind of air restrictions... If you tinker with it you can get easily 30-35 out of her... 👍👍👍
Thanks for watching and subscribe! Ironically this poorly performing bicycle is my best video ever most views lately . Please check out my fitness channel and subscribe too… fitness315
Yeah, you probably need to adjust your throttle because I don’t even think you reach half throttle, me and my brother has built these bikes for over 10 years and we choose to use a 36 tooth sprocket with a speed head, it almost brings it back to its factory feel But it will go close to 38 miles an hour to 40 miles an hour. It sounded like you were just cruising the engine at 40 miles an hour should be a lot louder
I have the same kit type thing and I can get around 30-37 mph at around top speed but maybe I’ve broken it in enough and I’m running 32:1 so it’s linner than most bikes
Some of these engines have absolutely horrible port timing and huge squish gaps. In addition to that, they can also have transfer ports that aren't angled properly (makes a good amount of the air fuel mix to exit the exhaust before it gets burnt). All of those things together will kill power output and maximum rpm. There are quite a few videos out there that explain those things and how to fix them. In addition to that, adding an expansion chamber exhaust can give you a 1 hp boost on its own.
So I just bought 100cc two-stroke motor kit and I can't seem to find on Google what the top speed is so what am I expecting stock as top speed? Because I bought a 50cc last time and it would go 25 mph
oh damn. I'm waiting for an offset intake to get here......now I'm worried i don't think i'm gonna hit 25!!! i'm 19 6'3 and 190lbs....I hope thats not too much for my 2stroke 50cc
So why are you riding on the wrong side of the road?? You as a bike rider should know to ride with traffic... YOUR SETTING ABad Example for Bikers and Bicyclist!! Now are far as your build... Sounds & runs good, Good Job On Your Build!! "Ride🚴On"
@@Drive315 the rules of the road go with bicyclist also bicyclists should ride with traffic so they can obey the laws of the road I think you're passing the wrong message through their buddy
Thanks for watching and subscribe! I think the gas mix wasn’t right… i had 40:1 mix but it should be 20:1 mix. I will do another video like this again in the spring
Thanks for watching and subscribe! When I recorded this video i dont think my fuel was mixed right, i ran it on 40:1 gas oil mix but it should be 20:1 mix. I will redo the video in the spring
S*** man and I was worried I was doing bad at45 km an hour sometimes hitting 50 km an hour and I thought crap man there's something wrong is not topping out like it should. But I did the math and 24 mph is exactly 38.62456 km per hour. So I guess I'm doing pretty good when I hit 45 km an hour easily on flat ground and then if I hold on the throttle long enough I'll usually get to 48 to 50 km an hour hit a little downhill slope and she'll start doing approximately51 to 52 km an hour if I'm already moving along at Full Throttle when I hit the downward slope. And that's all Factory Motor except for a little bit of modification I did to the air box also I replaced that cheap crappy factory zc plug for the appropriate NGK replacement I noticed the big difference from that. So after watching this video I'm not as concerned that my motor isn't running like it should if anything is probably running great. So thank you for making this video. Now I'm going to eventually Port the exhaust and intake ports and polish them. I'm not going to bother with the performance carb because these Factory carburetors are actually pretty good minus the crappy air box that's attached to them. I purposely drilled a few holes in that sucker to give it a little bit more breathing space. But those aftermarket carbs all you're doing is playing around with jets until you get the right air fuel ratio which chances are your factory carburetor is already putting out the extra horsepower, if you gain any, would likely be more due to the fact that it has a cone filter on it and it can breathe better. I plan on just buying the cone filter and hacking the factory air box to accept the cone filter. I happen to think that my Factory carb on my china doll is probably running as good as any aftermarket carburetor would especially once a good air filter is put on it. So for performance I plan on doing the exhaust, putting a performance CDI on it maybe upgrading the Magneto, definitely going to get the high compression head, then port and polish the intake and exhaust ports. That should boost her a little bit aside from that I don't think there's much more that's really worthy of investing money for performance upgrades so the upgrades after that would go into better quality tensioner pulley stuff like that. Just don't be fooled by the marketing gimmicks of these performance carburetors. And you should get a lot more speed out of your bike and if it's still being broken in expected to get a little faster as it breaks in provide it your braking it in properly. Don't bother with that 16 to one ratio neither run 40 to one from the get-go I learned the hard way and burned out the plug pretty quick with a bunch of excess oil all over the brand new block. It's a very excessive oil mixture even for a brand new motor how you drive it it's how you break it in has nothing to do with the oil mixture just make sure you don't lean it out too much 40 to one ratio and you're good to go. I learned a lot from the little bit from working on these bikes just recently and watching lots of videos Etc. It helps and I'm already a certified small engine mechanic
oh yeah I forgot to mention too after a little bit of research it turns out you can buy gearing for this setup. And it basically gives you three speeds low gear mid-range and high gear and you adjust them using your indexer adjuster on The Handlebar. So obviously there's a lot of redundant gears but you get three speeds that way which would definitely increase your top end speed I haven't done this modification yet but I 100% plan on doing it. Heck I even saw one this exact motor, and the guy had a 12 volt system on it with a switch and an electric start as well as gearing and everything. Amazing stuff what you can do with these if you put a little bit of Ingenuity into it
No problem man I love these things. They're becoming very much a passion of mine and a great Hobby. So get this just earlier today I made that comment and said about how I thought I wasn't doing good at my top speed. Well for s**** and giggles I took that factory carburetor and I move the clip up one notch to make the air fuel mixture a little richer just because I had a feeling that it wasn't quite getting its fuel at Full Throttle and sure enough blamo the freaking thing has all kinds of torque now and topped out at 57 km an hour on flat ground. I'm sure if I pushed it a little harder I might even get close to 60. We're talking kilometers an hour here but before I was fighting to get to 45 km an hour now I can get that at 3/4 of a throttle no problem. Amazing what a difference getting that air fuel ratio correct does. This is why I wouldn't bother wasting my money on those performance carburetors because all you're doing is putting jets in until you get that perfect air fuel ratio you can adjust your fuel ratio on these Factory carburetors just like I did today and now the thing flies like a bat out of hell. And all kinds of torque compared to what it used to have with the factory settings as well much more responsive much much more responsive. I could not believe it I figured this is probably going to bog down more and the way it's running is about as good as it's going to get. Fortunately I was wrong I mean flat ground 57 km an hour and I didn't really have to fight to get there I can get the 50 km an hour fairly easily and no problem 45 now. Full Throttle instantly48 km an hour about another second it'll start getting into the 50 km an hour range. That's a lot more than what they advertise anyway everything's Factory on this. I'm happy so for people who are having issues with that I mean I saw people talk about thinking that there's not enough fuel flowing through the peacock and stuff like that let me tell you if you got fuel in your fuel lines you got more than enough fuel flowing through your peacock even for wide open throttle you obviously have a problem elsewhere not sure why some people think that it's all about fuel flow from that peacock you can only put so much fuel to the float Bowl before it has to be adjusted to the correct ratio to go through the carburetor and burn in the motor making the peacock dump fuel harder into the float Bowl isn't really going to do much good or make a difference for that matter. Either way for those who are having issue at mid-range and wide open throttle think about adjusting your carburetor a little bit after you check the obvious stuff. And always check your plug burn and as well make sure it's burning at that correct ratio you want to see a nice caramel color not a light white color, it was really light tan or whitish it's running too lean it is really dark and cruddy is running too rich if it's nice and caramel looking then you got your air fuel ratio as good as you're going to get it. Your plugs are a great air fuel ratio gauge if you know how to look at them and read them. That's why it's always good to have brand new plugs on hand so you can do some plug chopping when you're adjusting your carburetor. Anyway this is all stuff I'm learning about these two stroke motors for bicycles otherwise I am a certified small engine mechanic however I have no experience with these bicycles I'm in a learning curve right now with already having the knowledge of small engines to begin with and understanding how they run and what they require to run Etc. But thanks for your top speed video man it gave me a good Baseline to go by. I would imagine at this point my little 80cc China Doll is probably doing better than most being all Factory. What's the point of adding performance parts if you don't have your carburetor tuned in the first place. Like some people will add a performance exhaust yet they don't have their carburetor tuned to the point that is running at maximum potential anyway what's the point of doing that. Me personally I like to get it running to its maximum potential on all Factory before I go to any performance parts. Now that I got it to that and my Factory Motor is running awesome now it's time to throw a high compression head on it and perhaps a performance exhaust. Either way you really have to know what you're doing if you're going to own one of these and keep them going. This is why I appreciate people who make you RU-vid videos like this whether it's already telling me something I already know or not some people may not and they most definitely don't explain this stuff in the manuals.
