Building a 70cc Minarelli Motorized Bike! 45MPH! Part 1

Around 7HP! 35mph isn't crazy fast, but that's not full power. Subscribe & Bell for more content like this! (LINKS TO PARTS BELOW)
Support: ko-fi.com/breezetix (APPRECIATED!)
Part 2: • 50mph+ with 70cc Minar...
Discord: / discord
MB stuff you can buy: www.amazon.com/hz/wishlist/ls...
Parts in the video, and the rest: www.amazon.com/hz/wishlist/ls...
$200 CMB Minarelli: www.californiamotorbikes.com/...
$200 Beach Cruiser: retrospec.com/products/chatha...
Viton Seals (15x27x5): www.ebay.com/itm/266412023058
0:00 Intro
1:02 How I found this engine
1:43 Unboxing (+ Info you need to know)
4:17 Rebuilding and porting
7:42 Working on my bike
8:14 New parts and assembly
10:53 Modifying pipe to fit
12:43 The rest
13:21 First start up and ride
17:24 Second ride (30mph+)
20:00 Uh oh...
21:03 New carb and mount
21:40 Guy doing wheelies on SSR 110
22:02 Adjusting main clutch spring
23:13 Inspecting the cylinder (Uh oh...)
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#motorizedbike #moto #motorizedbicycle

[@breezetixmoto]

You can buy a 70cc iron vertical minarelli replacement kit for $45 on CMB.

[@bertusbob]

👍👍👍

[@juancarlosrodriguez8381]

more on this type of engine

[@breezetixmoto]

I try to. I do wanna do more to it, just for sake of entertainment etc. I wanna upgrade to an athena sport cylinder already lol@@juancarlosrodriguez8381

[@mtavarez4561]

What kind of exhaust pipe is that?

[@Op1zilla]

Good video, those cylinders are strong so its probably ok, we be waiting on nxt video 👽👍

[@breezetixmoto]

yes but cold/soft seizes. I can still re use it if I re-hone it, and maybe a bit bigger piston if the bore ever gets bigger from reusing.

[@BurksWorksYT]

Hey man great upload, I learned a lot. Really nice editing, it really shows your personality. Keep up the good work man. 💪👍

[@breezetixmoto]

Ty

[@sharkmusic9636]

Awesome video! Keep uploading my guy :)

[@breezetixmoto]

Thanks

[@raymondjohns7617]

I built a 49cc model for my daughter. She now has a 76puch . We've had it for 2years now and she put quite a few miles on it. Thanks Ray

[@raymondjohns7617]

Oh yeah be safe.

[@breezetixmoto]

Nice

[@Littleevil9975]

Super awesome build brother sweet motor I own both on my channel I have the minarelli and the Athena super fun motors I subscribed also bro

[@breezetixmoto]

thanks man

[@Littleevil9975]

Welcome brother any time ride safe

[@Jarrod_D]

Thanks for the fun video 💯 😊

[@thebagelboyjr9351]

Hey Breezetix! It's Alex_Prototypical_ from the motorbike server you're in, great job on the video! Your edits are as clean as your build; props for the in-depth, quality video. You've got a knack for these engines and I'm excited to see more of your builds if you ever decide to build more 😁. I saw that deal from California Motorbikes, glad you snagged it when you did! I decided against it because if something bad happened to the jug, I'd have to shell out a pretty penny for a replacement. But it seems like you got a good kit that'll last you a while. Cheers!

[@breezetixmoto]

That I know of, I've only gone 20 miles on this lol. But at least this isn't a phantom, it should last. If the jug breaks, oh well buy the athena kit, more hp and rpm, ally jug, and should last longer.

[@MotorizedMitchell]

The Chinese minarelli jugs are $60

[@breezetixmoto]

@@MotorizedMitchell This is a 70cc 47mm vertical minarelli, cast iron, just so you know. Cheapest I could find on ebay was like $110 or something. $150 from moto something. I did find them on aliexpress for $25 + $30 shipping. Sadly I don't see any athenas for cheaper than $150. Think I'll go with saws, as apparently they're cheaper and gives you about the same power etc.

[@MotorizedMitchell]

@@breezetixmoto yeah, I'm almost done with my Minarelli and starting a saw build. I figured that after building multiple china dolls and a 212 then it's time to venture into hybrid engines!

[@4514rooster]

Nice ride!

[@GasBikeFanatics]

hey brother love your videos awesome job

[@NOVA-VROOM-VROOM]

Young man keep up the great work... Your welding gets better every time you weld...!!

[@breezetixmoto]

fur sure, thanks

[@breezetixmoto]

CORRECTION! I was wrong, you want both shields on both bearings removed, so you constantly lubricate the crank seals. I thought you wanted one shield (on the crankseals sides) on both bearings, to reduce the airflow, but still leak out the oil to lubricate the seals. Once I rebuild the engine with a new balanced crank etc I will do that now.

[@juancarlosrodriguez8381]

Idk men the guy from Build-Break-Fix kept the seal on the bearing on the side of the case seals. I don't think those seals needs lubrication since all they do is seal the case.

[@breezetixmoto]

@juancarlosrodriguez8381 lubrication helps make things last longer. Otherwise why even lubricate the bearings? Conrod bearings? The piston? Also I suggest you not taking bbf seriously at all

[@mtavarez4561]

That exhaust pipe is awesome!!

[@mtavarez4561]

What kind of exhaust is it??

[@breezetixmoto]

@mtavarez4561 50cc jog pipe on Amazon for $90. It's alright, with an rmh minarelli racing pipe it should give me a little more power and higher rpm than 9k ig

[@chadhicks2204]

Nice teardown and build! Funny editing. A couple dumb questions! If I was to buy this motor and head would I "normally" just have to do some porting work? And could I use a half moon exhaust since I'm not a fabricator? Does the motor come with carburetor off set? Excellent work building You really know these motors!

[@MotorizedMitchell]

Nice build 👍

[@breezetixmoto]

Appreciate it

[@Honeyyoboi]

u need to continue uploading brother, we need u .....keep it up

[@burton_bordel]

great work :))

[@breezetixmoto]

thanks!

[@motorizedandrew3942]

Awesome video man. Get that chain figured out while you’re at it

[@breezetixmoto]

this was 2 months ago lol

[@robertnevarez1970]

Awesome content! Start to finish. No need for a machine shop.

[@breezetixmoto]

Thanks

[@Stingyduce]

I like your channel I just hit the subscribe button!

[@breezetixmoto]

appreciate it

[@jakep5684]

Awesome video

[@breezetixmoto]

appreciate it

[@Ben-px3qg]

Where should I get viton seals?

[@sleepered7692]

Hé man You have a good Project it's the same of mine !!! you know how mécanique work, but you need one things for better perform !!!! good luck . i do my first Minarelli test this spring at this moment you understand what you dont have on your project !!!! good happy new year 2024 !!!

[@breezetixmoto]

thanks you too

[@user-ro3sc7fc8e]

Video super

[@keeganhache6667]

Do you have a link to those viton seals??

[@breezetixmoto]

It's in the description

[@peterjohn3180]

Oh I forgot, you can get liquid cooled cylinders for the minarelli vertical too!

[@kusherysouljas4867]

Would a dio reed valve kit fit on this motor?

[@breezetixmoto]

I think so yes, but you don't need to. The motor kit already comes with a vertical reed valve

[@bobbyb.6134]

I bought mine from go max and didn't put 2 miles on it when I corked it. Didn't know I had to take it apart . 400$ lessen.

[@breezetixmoto]

Ouch

[@cesarpagan4640]

Wesco piston hone out the cylinder for and port heat sees problems will be fixed until that Wesco Pistons give up

[@cesarpagan4640]

120$ for the piston

[@peterjohn3180]

For ultimate minarelli vertical cylinder look at MXS, Malossi mhr team, and cristofolini( maybe spelt that wrong).

[@peterjohn3180]

You need the big reed valve kit, there are loads, one was £25 with manifold suggested for use on a motorised, but the seller didn't realise it was for minarelli. You can get kits with basically the V shape ( in cross section) reed valves that bolt on and still have carb coming out of the side. MXS, and many more. Funnily enough the minarelli vertical has same reeds/ inlet shape as the honda Dio etc and Peugeot speed fight etc engines. Honda and Peugeot have reeds in the crank case beside the cylinder on the left.

[@breezetixmoto]

It has a reed valve...

[@peterjohn3180]

@@breezetixmoto yes but only a single sided one, minarelli cylinder wouldn't work without one 😁. Your inlet has the flow contact valve at 90 degrees. With a V shaped reed valve you get twice the inlet area. You know the reed valves that have a body that is triangle from the side? You can get an adapter. I have one in my cupboard, wish I could show you what I mean..... like reed valve on minarelli horizontal. Even the standard vertical inlet would work better than your set up as it aims inlet charge kind of downwards.

[@peterjohn3180]

@@breezetixmoto I googled big reed valves for minarelli vertical, sorry I couldn't find this video so left similar comment on other video! Sorry, not stalking you!🤯 Polini big valve £120!!!! MXS £ ? Nuraku(naraku?!) make one. I got one cheap, it was specified for standard motorised bikes cylinder! They sold adapter which was a block of aluminium, bolt/ thread holes and an inlet hole to cylinder - that would have just lowered power even with hole in piston. I think you can get an Athena cylinder kit for vertical..... with power valve! Useful for single gear.

[@cesarpagan4640]

My back rim locked up. I’ll be in traffic one time due to the piston expanding too fast. Scary shit. 💩 upgrade to better piston ASAP.

[@jamiebouchard9862]

Just coming across your channel for the first time and I’m very happy to see that you’re getting the views that you are. Although I am only a few minutes in, I do disagree with one comment. You do want to remove both of the seals on the bearing in order to allow Fresh mix to get to the crank seal in order to provide longevity and not having the crank seal dry out.

[@breezetixmoto]

Oh? I'll look into that

[@breezetixmoto]

Ok you are right, i'll correct that information in the next video

[@jamiebouchard9862]

@@breezetixmoto I’m by no means looking for you to correct it rather just to inform you so that you get a better result on your next build. I’m not one of the typical ego driven know it all from KZbin or even the Bicycle community but just to let you know.

[@breezetixmoto]

@@jamiebouchard9862 Nah, I said that you need only one shield removed from both bearings on the inside, and that will misinform people.

[@jamiebouchard9862]

@@breezetixmoto I apologize if that came out super corny or not making any sense. I’m doing talk to text on my way home from work. Up here in Maine at 9° right now sucks where are you located out of

[@skate_health7319]

How do y’all fix the lock up???? Mine ran for 20 minutes and now it won’t start, just locks and skids when the clutch is released. Got a new spark plug and switch on it, waiting on new CDI. Idk what else to look at

[@breezetixmoto]

It's an iron minarelli right? It mustve coldseized so hard probably from running too lean and also starting up and taking off fast without warming up. Take the head off and inspect. Pull the cylinder off if you can

[@skate_health7319]

@@breezetixmoto not sure . It’s a brand new Phantom V3. I’ll take it apart and check. Thx!!!

[@breezetixmoto]

@skate_health7319 that makes a lot of sense now... piston definitely shattered

[@skate_health7319]

@@breezetixmoto yep, Piston seized up, doesn’t seem cracked or damaged but I won’t know until I can pull it out and it’s hella stuck. How would you get it to loosen up?

[@breezetixmoto]

@@skate_health7319 well you'll have to try harder and maybe even hammer it out somehow.

[@cesarpagan4640]

Chain tensioner, I would stop using pull the back rim farther back ever since I stopped using chain tensioners I never have that problem no more I forgot what those thingies are called, but they use them a lot for dirt bikes to keep the rim in place use those

[@breezetixmoto]

Already did this, I actually ordered half links thinking I will need them, along with adjusting the axel forward (it was farthest back). Moved it forward and it just fit with 2 links removed.

[@jwserge]

3:59 - Pls write here: what is not good with this original Head? (I can not understand you, i'm not native english)

[@dustinh4175]

What size socket did you use to seat the bearings?

[@breezetixmoto]

Just find something that fits well

[@dustinh4175]

@@breezetixmoto that didn't help

[@breezetixmoto]

@dustinh4175 I don't see how it wouldn't, find a socket that fits the outer race of the bearings. If you wanna hammer out old bearings, use whatever those are trash anyway

[@dustinh4175]

@@breezetixmoto if I had a socket that fit I wouldn't be asking what size socket fits.....

[@breezetixmoto]

@@dustinh4175 I thought you had sockets that would fit. Socket says 15/16.

[@bertusbob]

👍👍👍

[@Tune.Up.Techie.]

id love to see you build an engine like this but water cooled

[@breezetixmoto]

it wont make any difference in performance, it's just to cool them better. especially if you have a more powerful engine that makes a lot of power and needs more cooling.

[@jeffyoung3528]

Would you have a link for the intake

[@breezetixmoto]

Which one specifically? The vertical intake/intake block? Intake setup?

[@jeffyoung3528]

Intake block

[@breezetixmoto]

@@jeffyoung3528 They can be hard to find. I could only find an offset one for $35 on smolikperformance site.

[@jeffyoung3528]

@@breezetixmoto thank you

[@cesarpagan4640]

Don Butler has some very nice super clutches check them out

[@breezetixmoto]

already ordered a cnc plate and pads and spring, its pretty much all im going to need

[@Tune.Up.Techie.]

how do i go about joining the discord server man

[@breezetixmoto]

@@Tune.Up.Techie. link in description

[@hotmom7241]

Is this kit for a 80/66cc or a 100?

[@breezetixmoto]

it's a hybrid minarelli engine. not a chinadoll, it's a scooter italian cylinder. 70cc

[@hotmom7241]

@@breezetixmoto so if i were to buy the other kit that you said you would get if that one blew up, would it fit my 66cc?

[@breezetixmoto]

@@hotmom7241 I have no experience in actually building hybrid motors like this, in fact I've only had one chinadoll motor (YD100) and one hybrid pre-built motor (this one). Join b0r3d's discord server link in desc and ask for help there

[@hotmom7241]

@@breezetixmoto ok thank you

[@leonardarola]

7 hps, ohh wow, 22 here. Guess we are not playing the same game.

[@breezetixmoto]

When my cylinder blows ill be getting that athena, or at least when I can afford it. 10hp+ at probably 13krpm

[@leonardarola]

@@breezetixmotoSure, do that. Have you checked my page?!

[@jamiebouchard9862]

22hp on a 4t maybe. I’m at 16hp on a 2t, we’re “not playing the same game”. Take ur lawnmower elsewhere Forrest.

[@leonardarola]

@@jamiebouchard9862 you ain't seen the ms660 RDM, Bouchard. 60mm piston. We are not playing the same game for real, kiddo. Let it sink in. Lmao. Btw, if you ever want to sell your engine to me, let me know.

[@jamiebouchard9862]

@@leonardarola 😂😂 Ryan himself said the rdm saw builds are inferior to piaggio. Kiddo. Why is it I can’t see any video of this 22hp performing? And ur 22hp claim is 1,000,000% fabricated. No one with a verified dyno has touched one. 60mm doesn’t mean shit. If it did, rdm would be all about piaggio, he’d build saws. I’ve got 8 rdm builds along with am6 and horizontal builds. Stop pretending ur build is superior on a young fellas channel, it’s misleading. He can easily click my channel icon and see dozens of videos of the best bike engines on the market🤷‍♂️🤷‍♂️

[@mtgreen88]

Are you in any of the Facebook groups?

[@breezetixmoto]

Just RMB i think, though I don't really go on there much. I'm active in B0r3d's discord server, link in desc.

[@MotorizedMitchell]

@@breezetixmoto best motorized bike community

[@fletcherjacobs3688]

Where is your accent from? Also nice build 🔥

[@breezetixmoto]

Im deaf

[@fletcherjacobs3688]

@@breezetixmoto oh my apologies I wasn’t trying to be rude. I feel like a dick.

[@breezetixmoto]

@@fletcherjacobs3688 not rude at all, rude people are just making fun of my voice or something like that. i get it all the time dw lol

[@fletcherjacobs3688]

@@breezetixmoto absolutely would never make fun of you. I was the goth kid in high school who picked on the bullys. Keep doing your thing. Ima sun rn. I’m waiting on parts for my build. It’s on a 02 Kona muli mula.

[@sleepered7692]

You just need a better bike I don’t know if à gaz bike is better because more pounds my Specialized s work near 14 pounds it’s stiff and very light weight reduction gaz Bike whitout engine near 45 pounds good day thanks for your ride I’m coming soon !!!!😅

[@breezetixmoto]

What makes you think im doing this just to ride fast?

[@cesarpagan4640]

You’re supposed to let the bike sit for two hours while that’s on it’s a iron cylinder cylinder comes from a moped let it sit for two hours turned on turn it off after that. Let it sit for 20 minutes and then repeat. Make sure you use 40 to 1.

[@breezetixmoto]

why would i do that?

[@MotorizedMitchell]

This is completely wrong. These are air cooled engines and don't have a fan too cool them so leaving it idle for 2 hours would cause it to overheat. Also, leaving it idle for 2 hours does nothing to break in the engine, a proper engine break in uses heat cycles and varying the rpm while riding the bike

[@ncopp4358]

2 hours? Absolutely wrong. That will in fact destroy an iron cylinder. The rings need to seat properly with mid range rpm. Letting it sit for hours will overheat along with drag from the new rings that will strip away the plating on the new cylinder. Have you done this and if so, have you check the bore afterwards?

[@REDAMISS]

And if you want to get technical about it on the heat cycle when it's hot you want to put the piston on the top dead center so when it cools down it doesn't shrink up on the lower part so you will still have good compression while the Pistons on the top

[@vijaykorvekar1009]

Max rpm

[@breezetixmoto]

9000

[@cesarpagan4640]

Don’t use that piston. That piston broke on me in pieces inside my motor not fun.

[@breezetixmoto]

I wasn't going to use it... I asked for a replacement and waited. Made sure the pins didn't move

[@dingonek2007]

Why the hell does bro talk like that

[@breezetixmoto]

because im deaf

[@REDAMISS]

I still don't get why everybody sits here all my friends too by the way they bought these stupid motors from China and then they spend every single day tightening up the rim ringing on the Piston blown piston rings everything is always going wrong with it when they could just go and get like a 50cc KTM or 655 CC KTM with with a 5-speed in a clutch that actually will hold and blow that bike to the Moon do you want to be able to keep that front wheel down if you really want power on the cheap

[@breezetixmoto]

Because it's a hobby. We're building MB's for fun. Plus, it's cheaper. The chinadolls/hybrids can last a long time if you do it right.

[@connorferguson73]

I think your friends are just retarded and cant seem to handle an engine well

[@DatBlueHusky]

god your accent is hard to understand

[@breezetixmoto]

yeah, thanks to my deaf voice!

[@dois9sete5Ms]

that's Chinese engine!! not minarelli!!

[@breezetixmoto]

It is a minarelli cylinder. On a chinadoll bottom end.

[@dois9sete5Ms]

@@breezetixmoto not minarelli cylinder either!!! MINARELLI ARE A ITALIAN BRAND!!! if you buy a cylinder in internet, FOR MINARELLI ENGINE dont mean that cylinder are minarelli..... you dont have nothing from minarelli in that crap

[@jamiebouchard9862]

@@dois9sete5Msfalse. It’s absolutely a minarelli cylinder, regardless of where it’s made. Minarelli makes both vertical and horizontal cylinders which is the make. Just because China offers a cheaper, lower quality cylinder, doesn’t make it NOT a minarelli

[@dois9sete5Ms]

@@jamiebouchard9862 you must be kidding me.... do you understand anything about bikes???

[@dois9sete5Ms]

@@jamiebouchard9862 MotoriMinarelli ARE A REGISTERED BRAND!! only OEM parts are minarelli!!! Athena parts are NOT minarelli, motoforce parts are NOT minarelli. damn go get some knowledge before try argue someone else talk

[@standtallvets5386]

I have the 1972 CT 70 Honda that uses a small kick starter that still works good 50 YEARS later!!! That's half a century people. Yet they can't make the right starter for the 2 or 4 stroke these days. Those are all junk caveman engines.

[@breezetixmoto]

Ok... They are bicycle engines. Made to motorize the bicycles. Made cheaply in china. $100-150 bicycle kits on ebay/amazon. Of course they don't have it. Don't even need starters, just pedal and drop in clutch to start, that's it. Thanks for the comment.

[@Jarrod_D]

Get a life bottom feeder 🚴💨

[@ganjaman2213]

8:14👁️

[@juancarlosrodriguez8381]

I thought the crank came balanced from California bikes. It says so on the description of the engine on their web site. That's a bummer if this engine does not come with a balanced crank everybody knows to run a minarelli hybrid properly you need a balanced crank. Great video by the way on this type of engine!!