bacon
Scoot Member
Posts: 55
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Post by bacon on Jul 15, 2024 14:36:34 GMT -5
Has anyone ever done any real tests to determine power output of a modded machine? I'm talking a real Dyno, not the butt-dyno.
I've read that a stock 49cc Zuma is in the ballpark of 2hp (wiki) which actually seemed kind of low to me. I've also seen claims of 19hp (MXS vert sport) and 8.5hp (polini sport) for some 70cc kits. Pretty huge variation - just wondering what kind of hp and torque we might expect after our tinkering.
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Post by Zino on Jul 15, 2024 17:29:02 GMT -5
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Post by aeroxbud on Jul 16, 2024 5:39:04 GMT -5
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bacon
Scoot Member
Posts: 55
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Post by bacon on Jul 16, 2024 8:45:32 GMT -5
I've got an itch to do some sort of a frankenbuild...I'm not sure if it'll happen but I seem to always have spare engines or parts laying around that could be fun to stuff into something like a scooter.
Realized last night that I have cylinder set off a Husqvarna 395XP that uses a 12mm wrist pin and has a 42mm (I think) stroke. It'd take some fartin around, but I bet I could adapt that thing to work. If I could, they make a lot of cheap top end kits for easy swapping. I also have a 22hp horizontal shaft B&S Vanguard...that would take some serious work and re-gearing, but i've always wanted to stuff one of those in something unconventional. From what I read, it has about 30ft-lb of torque and even if there were 50% drivetrain losses that would still put about double to the wheel of a standard big bore kit.
Maybe something to do when it's snowing.
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Post by Lucass2T on Jul 16, 2024 9:37:07 GMT -5
I've got an itch to do some sort of a frankenbuild...I'm not sure if it'll happen but I seem to always have spare engines or parts laying around that could be fun to stuff into something like a scooter. Realized last night that I have cylinder set off a Husqvarna 395XP that uses a 12mm wrist pin and has a 42mm (I think) stroke. It'd take some fartin around, but I bet I could adapt that thing to work. If I could, they make a lot of cheap top end kits for easy swapping. I also have a 22hp horizontal shaft B&S Vanguard...that would take some serious work and re-gearing, but i've always wanted to stuff one of those in something unconventional. From what I read, it has about 30ft-lb of torque and even if there were 50% drivetrain losses that would still put about double to the wheel of a standard big bore kit. Maybe something to do when it's snowing. I would say go for it! Make sure to post your work here when it's done! That chainsaw puts out 4,9kw, thats not a lot for 98cc's. Thats what you can make with a very basic cast iron 70cc kit, Yasuni R and a 19mm carb. It's not difficult or expensive. 18hp like from that B&S is also not difficult, 15 years ago you could sqeeze 20+hp from a 70cc with off the shelf parts. But then again, building a frankenstein motor is cool and a nice project to start on. I bet not many people have tried it before so you maybe can be the first. |
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bacon
Scoot Member
Posts: 55
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Post by bacon on Jul 16, 2024 12:18:06 GMT -5
Keep in mind those numbers are based on a stock saw. All the power adders for our 70cc kits (carb, exhaust, intake, tuning, etc) would also apply. The saw top end is just the displacement. Stock saws are heavily regulated for emissions and they use tiny inefficient mufflers. Id bet you would see significantly more power out of that than a modded 70cc all things being equal. I'm sure you know all that, but had to say it anyway  |
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Post by Zino on Jul 16, 2024 18:49:31 GMT -5
go for it
Ryan Ott I believe still has his Yamasaki 2 stroke motorcycle build
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