Ported YD100 gas bike Dyno Run- 21mm carb, G2 reed, MZ65 exhaust, Ported w/ -Dentist Drill!-

[@leonardarola]

Heck yeah. I want one. Showed this video to my mother and she said "hell no"

[@trentbikes]

Just tell her you're going like 20mph max

[@ghettobikelife8833]

⁠@@trentbikesyup- let her ride it but loosen the carp out of the throttle cable adjusters so it hardly opens lol

[@Op1zilla]

This what im talkin bout, in the Science Lab Werkn Chit!!👾👽👍

[@dustinh4175]

That thing runs great

[@motoredbikemadness2061]

Thx! I thought so too, but really the only unique thing I can attribute it to is the transfer port angles and roofs that I worked over with a dentist drill type tool

[@motoredbikemadness2061]

I’m easily satisfied though, I crack the throttle on a stock 80cc bike and think “wow this is awesome” lol

[@ThtdripGaming]

Now this is a cool channel

[@motoredbikemadness2061]

Thx so much! I’m trying to get back into doing this stuff again

[@JMB676]

That’s pretty freaking awesome bro, good ish brother.

[@Eduardo_Espinoza]

Awesome! :D Subbed for more of these! :D

[@motoredbikemadness2061]

Thx, glad to have u around! I kind of stopped posting but am getting back at it now

[@davidprice2226]

Nice bike gets a runner I see

[@johnpeiredaquavoii2213]

The YD100 isn't even a 100cc, but an 80. The avenger 85 is a true 85cc

[@motoredbikemadness2061]

@johnpeiredaquavoii2213 yup, it’s kind of annoying how lying about the engine size is the norm here

[@johnpeiredaquavoii2213]

@ Yeah, there's a reason God HATES lying

[@skipstalforce]

THats a crazy amount of power to be putting threw a bike frame!

[@mickeycab1]

Great job how did you for gas tank I'll pay for one

[@motoredbikemadness2061]

It’s a pre made frame you can buy for motorized bicycles- this one is a “felt faker”. Google felt faker gas tank frame and you’ll see them for sale. They come with the tank integrated, but you usually have to seal them up yourself (gas leaks at the welds lol)

[@pewpewbbqs]

Any info on porting the yd100... Never did port work before... trying to acquire some info before I start

[@motoredbikemadness2061]

Unfortunately I didn’t put a degree wheel on it, if you’re planning to. But I mostly stuck to the stock port windows anyways. So basically- I kept the transfer timing the same (didn’t cut the port edge any higher), but I used a 90 degree rotary tool (‘dentist drill’) to fix the transfer roofs. (there was an angled ridge ~5mm from the port exit where the port suddenly narrows and angles up more, all of the two-transfer port bike motors I’ve seen have it). Transfer roofs should ideally be flat and aim 90* across for power- so I ground down the entire roofs to be 90* and the same height as the old exit edge (which was the highest part). This way I also don’t have to worry about making them two different heights. I also ground out the rear (intake side) corners of the transfer exits so they aim even more away from the exhaust. Just doing this stuff, and especially from removing those crappy casting ridges made the ports look way larger. Now the exhaust, which people usually prioritize I haven’t done much to yet. Just measured it, and it’s 20mm tall and only 22 wide- so it would definitely help now to widen the exhaust a bunch. But since I never degree wheeled it I kept it small and conservative.

[@motoredbikemadness2061]

And ofc the intake porting is null/void since it has a windowed piston. I just enlarged it a little bit anyways.

[@pewpewbbqs]

@@motoredbikemadness2061 Thank you. I appreciate it!

[@cesarpagan4640]

What carb is that? What size is you used?

[@motoredbikemadness2061]

It’s a China copy of the dellorto PHBG carb. If you Google PHBG carb there are 19,20,and 21mm size Chinese copies you can buy. I think they’re used for 2 stroke scooters

[@EdKennedy-ws8wu]

What was the mph ?

[@db.farmzz]

52

[@motoredbikemadness2061]

Yup! I think it was right around there, but there’s two (I think) vids I did with speed runs of this bike, as it was in 2 different levels of mods. The faster ride was with the bike how it was set up here

[@EdKennedy-ws8wu]

So how fast did it go ? Mph ?

[@gasbikesetc5820]

Between 50-55 I remember seeing, there was another video showing top speed and riding

[@OzzmosisMining]

What size jets are you using? I'm running an identical setup

[@motoredbikemadness2061]

whatever jets were in the phbg21 when i bought it lmao, it ran great so never needed to change any. except maybe the pilot

[@gasbikesetc5820]

Do you have the same carb as this?

[@jeremyclarkson6293]

Thats a really nice build you got there just subbed anf liked btw How much power Will i get if i don't port it but with an expansion chamber reed and 21 mm carb and Windowed piston ?

[@ghettobikelife8833]

Is this a yd100 you’re talking about or a regular “80cc” motor?

[@ghettobikelife8833]

Do you mean an expans. chamber similar to in this vid, or one of those super short little ones that hang below the bike? Usually those short “banana pipe” expansion chambers don’t help at all

[@motoredbikemadness2061]

Maybe 3.5-4hp if you use a good style expansion chamber and reed valve/better flowing carb (not something super short, or those ultra long-thin ones like the flexible ones). But you’ll be limited in rpm pretty drastically using a properly designed pipe on a stock port timing exhaust

[@damnthiccassboye7138]

what is the max rpm and do you have a balanced crank??

[@ghettobikelife8833]

Sounds like maybe 8k no load? Just a guess with my carpy ears

[@EdKennedy-ws8wu]

Umm that's 154 mph 😳

[@db.farmzz]

@@EdKennedy-ws8wu where are you getting these numbers????? hed have to run crazy gearing for that, and a LOT more than 6 hp

[@orangecrushergd557]

Wow, is this engine ported? I also remember frederick made his motors with the 21mm carbs they work great

[@motoredbikemadness2061]

Yup! I remember Fred had a velocity stack/trumpet on the end of his PHBG carb too. I found one that looked just like it on AliExpress but it was over $50 and months long China shipping