49cc 4 stroke bike engine upgrades

[@joshanderson1019]

i had one and the chain for the transmission kept snapping, i got a belt drive one from gasbike and the belt kept snapping so i bored it out to a predator 212 with a 30 series torque converter and 400 miles later i've had no problems

[@123edwardzpad]

Sweet! That's the best looking 49cc 4 stroke I have seen on the Internet. Good job. Nice video. Thank you for sharing.

[@mrpartridge8765]

Haha thank you. I love this little engine. It has lots of potential you just have to bring it out. I just had the cvt scooter up to 43mph with that engine.

[@123edwardzpad]

@@mrpartridge8765 Super cool.

[@nwsights6301]

Now THIS build is what my scooter is missing, I already have a scooter that this motor will plop right on to, have all the parts saved and ready to order I'll let you know when I get it built and how it does! Thank you for this upload!

[@mrpartridge8765]

Check out the scooter I put that on. I made a cvt for it. I have a Playlist on my channel with all my scooter content. Keep me posted on your build. If you have any questions just ask.

[@nwsights6301]

@@mrpartridge8765 Went through and watched them, the scooter I have now uses a transmission that drives a chain to the back wheel so I have some options. The type of 49cc engine on my scooter just lacks the ability for customization which sucks

[@stubby7934]

Careful with how much weight you're hanging off the exhaust pipe; the more you have, the more likely you'll break the bolts off in the head. That poly hose isn't rated for gasoline...no biggie short-term, but you might want something that can handle it long-term. Thanks for the tips!

[@mrpartridge8765]

Thanks for the tip. I got all that stuff taken care of when I finished the build it was going on.

[@787305pilot]

Some people either completely remove the clutch springs off the stock clutch or rig much lighter springs. They say that it makes the clutch grab on early and very well. It make the bike run like a whole new bike and the clutch lasts longer. Iv seen a couple videos on KZbin about putting lighter pringa on those stock clutches. kzbin.info/www/bejne/rYeWeqOip9GDpJY

[@MilesPrower69420]

i wanna see this thing rip! your the only one thats actually taken some time to do anything, lol.

[@mrpartridge8765]

I have a video coming as soon as I can post it.

[@mozezcen-valley7555]

Great video keep up good work I'll be watching

[@WillB-lv1xg]

I have found another upgrade too which is to replace the flywheel and cdi with genuine honda ones since the governor is in the cdi. I heard around 9000 rpm the cast aluminum connecting rod can break. Is that an ezip scooter?

[@mrpartridge8765]

I thought about doing that but 6800 rpm is enough for me. If a billet aluminum rod was available I would definitely do it. The scooter was a schwinn s350 or an ezip 350. I collect those scooters because they are really well built. I used a schwinn s500 with wheelchair batteries as a way of getting around. I have videos of it on the channel

[@bluemoser]

Do you have a link or search description for the clutch? Looks beefy awesome.

[@mrpartridge8765]

www.ebay.com/itm/185063568940?hash=item2b16a5f62c:g:ZL0AAOSwJvxhShWQ&amdata=enc%3AAQAHAAAAoKSrrkHitnmJ6nfwLcpl4zzNF69X2nEI69zpMvH%2FNQfokRr4VOKQr0DUUGJ6FSBAoJLai6NjPHGQu6%2FlhwOHQDYa7oQgjvTBTk8LhsdobPgWe2SybbtTE99NZF2SL1V282cGDwTH42HEex3rvu4qqIY8KSdo2nyMbLCHjarQkagqDXLxOyeengO2EQe0%2FE22mER4D88jPMcQvoe2O%2Bp9dYc%3D%7Ctkp%3ABk9SR9y5kYrgYA

[@bluemoser]

Appreciate it! Thanks!

[@E-bikeNation]

I have the Honda GX 50 I can't get the clutch to fit like yours

[@Littleevil9975]

That’s pretty cool bro

[@heavystarch100]

Cool, but with that carb youll have serious fitting issues unless you can turn that intake outward. But I got 34 with my Huasheng stock with a 44 tooth sprocket.

[@mrpartridge8765]

I have that engine on a friction drive kit I modified to a schwinn scooter. it moves right along for what it is. I have a few videos of it on the channel.

[@heavystarch100]

@@mrpartridge8765 will never fit on a bike frame. Thats what its most used for.

[@TheAverageG4mer]

So there's really no upgrades that you could do for this engine other than a carburetor and exhaust and doing the belt drive transmission? Cause I just purchased this and it does about 25 sometimes 30 downhill.

[@livingexcuse3767]

What was your rough speed increase after making the the engine breath better, thing looks like a unit now.

[@mrpartridge8765]

I got a 4 mph increase with the friction drive at the time. It's now running a cvt from a taotao scooter. It'll do 43mph with the cvt setup.

[@livingexcuse3767]

@@mrpartridge8765 That thing has enough power to run a CVT and still do 43mph? holy crap dude.

[@mrpartridge8765]

@@livingexcuse3767 I have a few videos of the cvt system and how it works plus I have ride footage as well. It's still a work in progress though. The cvt still isn't tuned properly. It's on a schwinn scooter that I'm trying to make road legal.

[@chrisstokley7687]

good info.. tyvm... luv the carb... waiting on the clutch video.. :>) ... seen the short video.... need moreeeee lol.. share the luv.. 49cc my fav.. motor!

[@datvik7187]

I need to see it run. I have the 53cc china 4stroke kit. Just want to see ur build running before I buy the 139qmb carb

[@mrpartridge8765]

My most recent video is with that carb. I have all of my gas scooter content on a playlist. I try to keep things organized on my channel

[@datvik7187]

@@mrpartridge8765 thanks just watched the vid. Looks like the scooter has good power up the hills.

[@DylanSchmidt-gu2sx]

You can add more power all you want but you aren’t going to gain any top end speed. With your setup I could see getting more top end speed but other than that no.

[@drmachinewerke1]

What 4-speed are you going to use.

[@chrisstokley7687]

followed all your videos and i balanced my crank then cant get the valve lash rite! pops a little like it wants to start.. but suts up the new plug in like 10 trys.. Black..... huasane carb - need a detailed carb clean video.... seems i got to spray carb cleaner to get it to try crank... cleaned it 6 trys.. maybe its way i put jet back together.. wierd tube inside... idk.. help !!!!

[@E-bikeNation]

I have GX 50 Honda

[@christopherjacquez8605]

You can't open these engines up ?

[@mrpartridge8765]

You can split the case open to get to the crank but there is no cylinder head to remove. Its a very strange engine block.

[@applepoop10]

The cylinder head and the block are one piece.

[@Baldys_projects]

Yeah but requires extra steps like splitting the bottom apart and draining the oil removing the rotating assembly however it is possible to port the intake and exhaust ports.

[@mrpartridge8765]

@@Baldys_projects I'm swapping the crank to a straight shaft over the winter. When I pop it open I'll do some port work. I need the straight shaft for converting it to chain drive. I'll be banging through gears when spring hits

[@KennethMcaskill]

so whats the part number on the clutch

[@motorizedbicyclenation53cu90]

Add a torque converter

[@mrpartridge8765]

I'm running it with a gy6 cvt. Much better than a 30 series cvt. It really let's the engine put power to the ground.

[@ExpediteTravels]

Can you get a modified cam for this engine?

[@mrpartridge8765]

I wish. It's a single lobe plastic cam and nobody makes an aftermarket.

[@ExpediteTravels]

@@mrpartridge8765 dang it the cams are pretty cheap. Maybe you could get someone to weld one and re-grind it or re-grind it yourself

[@dronestuff]

I got the same gy6 carburetor for my hs144f motorized bike and i can't get it to run, i plugged the enricher thing and it doesn't start and floods the engine, any ideea?

[@mrpartridge8765]

Sound like it's getting too much gas. What size jet did the carb come with? I run an 80 jet but my engine has had a port and polish and a high flow exhaust. If you're running the stock exhaust you may need less fuel.

[@dronestuff]

@@mrpartridge8765 i run the stock exhaust with the cap off, i don't think that the jet is the problem, i think it's some kind of tuning involved to get it running, i'll try tomorrow to tune it with some tutorials.

[@chrisstokley7687]

@@dronestuff Thinks is CARB: This SAme carb comes with Few diferent mixes/ intake can be 18-19-20 mm .....stock- most comes with 14mm .. for 49cc... 20mm.. is like for 120cc.. ugh... 15hp gains from add exhaust+ the carb .. is why works -thinks is 18mm for 49cc.. 19mm. for 212cc stock... see? is a close dance for the mix.. fuel+air... 18mm. be peppy + quicker to get to max ... then bad things will happen if push it! thinking ..when carb goes bad/do the upgrade then and NOT add the 80 bigger jet ..!

[@joerolfe7967]

An OHV (over head valve) engine like this one does in fact have a removable cylinder head. You have to remove the valve cover and then springs and your head bolts are under the valve cover.

[@mrpartridge8765]

That engine has no cylinder head to remove. It has no bolts to remove. I've already had it apart. I have been working on small engines for years I know what I'm doing. The 49cc huasheng is a clone of the the honda ghx 49 and is a 2 piece block meaning that it spilts open at the crank diagonally.

[@motorizedbicyclenation53cu90]

It has a cylinder no head I hear

[@drewsey5733]

Honda has a weird fascination with building engines like that. The GC ohc motors are like that too. Weird, but it works and you don’t have to worry about blowing a head gasket so.

[@harrybobb7282]

@@mrpartridge8765 can you please make a exhaust headers for me like that

[@jerryb1234]

That engine don't have a head huh?, lol, the only difference is that one has valves, and the other has open holes instead of valves, you need to get an old 4-stroke engine to tinker around with, thanks for the carb tip, it's much appreciated.

[@mrpartridge8765]

I am quite familiar with how engines work. I have worked on flat heads, ohv's, and 2 strokes. Do your own research before you make an ignorant comment lol. That engine has no removable head.

[@ethanheitz4489]

I saw your video and I am currently trying to do the same thing. I got the GY6 carb, blocked off the one choke port like you did, I have spark, I have fuel going to the carb, but the engine won't run. Plus whenever I turn on the petcock from the gas tank, the carb just GUSHES fuel like crazy, leaking out the bottom and everything. What did you do?

[@mrpartridge8765]

There is supposed to be a hose to drain the carb that attaches to the bottom of the bowl. If the carb came with that tube put it on if it didn't just fill the hole with epoxy. The engine won't run because it's draining all the fuel through the hole.

[@mrpartridge8765]

I have videos of that engine on the scooter running and driving if you want to see it go. You'll see the hose at the bottom of the carb I was talking about. I hope it works for you.

[@ethanheitz4489]

@@mrpartridge8765 Gotchya, thanks! I'm trying to figure out my jetting now... she doesn't wanna idle and she randomly gets crazy and revs to like 3000 rpm with not throttle input... lol

[@mrpartridge8765]

@@ethanheitz4489 tuning a gy6 carb can be tricky but once you got it tuned it'll run great. There are lots of tutorials on how to tune the 139qmb gy6 carb on KZbin. I don't have a tuning video because I'm still learning lol

[@user99524]

what carb pls send link?

[@ethanroy5462]

Where did you buy the carburetor?

[@mrpartridge8765]

I got it on amazon for $23. A main jet kit is $8 and so is the idle jet kit.

[@ethanroy5462]

Thanks, do you notice a difference with the upgraded clutch? Is it worth doing? I have a similar engine on a gb Moto pocket bike.

[@mrpartridge8765]

@@ethanroy5462 the upgraded clutch grabs hard and never slips but I have now broken 2 of them. The springs snap and a pad comes loose. It happened after I made this video. My engine eats clutches. It will work and work great I absolutely loved it till It broke. Give it a try its the bfg upgraded clutch and can be found on ebay and Amazon for $13.