Motorized bicycle big bore kit: Is it possible?

In this video we will assess the possibility of big bore kits for a standard 66/80cc motorized bicycle engine as well as some alternatives and performance modifications that you can do.

[@Maarlooonnn]

maybe you could adapt a big bore kit for Peugeot 103 or a MBK 51

[@Lazydomsgarage]

cant you swap out the the top cyclinder with one that fits then swap out for a bigger piston

[@magdamolina3999]

Yes is posible

[@adamdorris4081]

looks like his injured hand started bleeding again... would have to manufacture a baseplate shim for a new jug kit that's wider but has a jug skirt just shy of the crank so it doesn't hit and your stroke will stay the same, you'll get more displacement and most likely wouldn't have to mess with the ignition timing. bigger carb,and pipe depending on cfm's.

[@frankziola7710]

you think like me yes I'm an engineer myself and yes anything is possible thanks for the tip about push

[@joshuaharrison9331]

not crome - Nikasil

[@JamesPiccone]

Actually those aren't Nikasil, those are cheap chrome lined

[@BeezyKing99]

eliofall you'd have to change the piston and the cylinder head to match the cylinder.

[@thra5herxb12s]

Should assess the posibility that a pushbike frame is not strong enough in the first place.

[@forrealbruh0199]

unless its either made specifically for it or you make it yourself

[@rckbike]

hahaha finaly found it.. thx

[@willwarren9545]

Jake's and crmachine a few others do

[@magdamolina3999]

Cheyon 22 and zedamotor sport and barba racing make a Nice Big Bore

[@dopstuff5796]

And you can Bore your 2stroke and Sleeve it

[@obesehamsterfilms8078]

Maybe someone could just make a jug that's already bored out but has the bolts in the same place and also include a piston to go with it as a sort of kit. although there probably is a limit to how fast you'd want to go on a bicycle that's only meant to do like 30 mph tops.

[@YorHighness]

Stihl 440 chainsaw jug piston and cnc head Frankenstein build.

[@mrbanana7167]

Kits like that are showing up on ebay as of now 😳

[@m0ntr0s0]

hi i like to ask if u have a used cylinder for sale dont matter if the cylinder is bad i like to try something thabks ?

[@mbrrideitlikeyoustoleit8436]

Big bore life 💪💪💪 💯 50mm iron sleeve zedamotorsports#1

[@chfar072281]

Pick the manifold up, turn it around, set it down, then pick it up again, lol

[@midwestmotorbikes2696]

Only if juice was still around for today’s world of motorized bikes....... someone did a PUCH conversion in his day anyways...

[@johng2779]

That's not plated that's polished bruh. If you polish aluminum it shines like chrome. That's not plated.

[@WillB-lv1xg]

Stihl 660 jug works. Its like 90cc you have to modify the bottom end zeda made it.

[@YorHighness]

Yep you just need a 40mm stroke crank and 40mm long Rod engineTriple40work)

[@eliofall]

can you put a 66/80 cylinder on a 49cc engine? will it just bolt on? what mods do you have to do?

[@tylernahtt7114]

Can u?

[@robertpolicastro1]

Yes

[@backyardrestorations]

Yes I’m pretty sure you can.

[@tacticalwarfare8413]

Can you weld and machine the combustion chamber for higher compression

[@MezzysAutomotive]

“Sand down the squish gap to increase it”

[@djredhareaus38]

stroker kit ?

[@g-track5065]

Your greatly appreciated

[@reillystsb]

you could probably bore the cylinder out 2mm have to. realign the cylinder" u s Chrome could do it" then you need to find an oversize piston good luck with that one

[@cliffordbradford3257]

Holy crap this video is from 9 years ago and I didn't discover these motors till about a year and a half ago. It's crazy how unpopular motorized bikes are. You would think they'd be world wide popular by now but they ain't.

[@anythingthatmoves9609]

Sthill 440 cylinder

[@susanmarie4257]

with the factory engine 'I would just go with forced air injection 'better then boring it out anyway.

[@JustinBobby-di9zt]

You could just replace the cylinder sleeve.

[@signalhillscooter]

There are two sizes for these motorsm 49cc and 66cc, so there is a big bore kit if you have the 49cc kit. You just get the larger replacement cylinder, head piston and rings. Up jet you carb a bit and let it rip

[@lazn9863]

there is not enough meat to bore these and insert a cylinder , the chinese should get their shit together and produce a true 80cc head and piston. because with 60cc and being 80kilos u dont go nowhere

[@Brittvanegas]

thats not true buddy :)

[@johnhull6363]

Yes it is....if you get a run on a hill you can make it....try starting on one

[@adamdorris4081]

bearings might go through.

[@jamescagney4372]

Well I'd agree but no. I'm sure you know that is the only reason these things where ever made, that's teardown.These engine are great for putting out at least 15 horsepower with a welder aluminum scrap and a key to the local dealership parts and service door.Yeah got a pile of money to burn so I'll farm it out man..

[@RoomGrow]

These engines make 3 HP at the most!!! and I didn't understand half of your comment??

[@lucajo16]

Jason Teasdale If you do some modifying of the engine the most this type of engine will maxx out at is 9HP but by the time you get 9HP it dosent look like a normal engine. Looks like some kinda dirt bike engine ment for a race track. XD Rock solid sells there race engine for 1100. There engines are some of the fastest available but they blow quick...not ment for public roads.

[@lucajo16]

Hay james your argument is pretty much invalid. If your into the community the race bikes are maxx 10 HP. By that time they don't look like bicycle engines. 6HP is enough for anyone.

[@christophernewby3565]

Um I went up to q 53 mm piston with the 80cc rod with just a dremel tool never had a problem yet with over heating

[@SnookTuned]

Got any videos of it running?

[@JamesPiccone]

You're full of shit

[@pcparlor]

Yeah exactly you haven't had a problem with it overheating because it doesn't run anymore LOL

[@charleskizer6924]

Will a 44mm piston work for my 80cc motorbike

[@mflbikes1870]

No

[@mflbikes1870]

47mm

[@LordRevProfRustyjLugnuts]

actually if there was enough material in the "jug" area you could theoretically bore it out and have the bore rechromed...check out these guys....usnicom dot com they also do a piston coating process that could also prove beneficial