Huesheng 53cc 50 mph target



The_Aleman

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May 2, 2007
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875
I met Nashmoto at the last race, pretty cool guy. We were the only 2 there with 4 strokes in the 50cc range. I wanna one day get a nuvinci hub like his, still out of my price range.
Yeah he's a stand-up dude. He runs the older NuVinci N171, not made anymore. The N360 that came later can't handle even our engines' modest power, unfortunately. NuVincis are also quite heavy and take expensive fluid that they like to leak out when warm :cautious:

A multi speed hub is that expensive??
It can be, depends on the IGH. A used wheel with an IGH might be under $50 while a brand-new hub itself is $100 or more. NuVincis aren't cheap by any means, they have the most "gears", with 64 different ratios. Oftentimes you have to build the wheel around the hub, too. Not hard to put over $300 into a rear wheel.

Build the 79cc instead. Still can pass as a 50cc. Way better motor.
"Better" is relative. Sure it's cheaper and easily twice as powerful, but it's also wider, heavier, and has a lower rev range. That rev range limits it in versatility with a single-speed drivetrain. If one uses a CVT to get maximum versatility, the bike is no longer easy to pedal. Long-term term revs over 5K RPM also make the stock flywheel a safety liability. If one doesn't want to chatter teeth off the line, one needs lower gearing or a high-end clutch. I had a 79cc once and I sold it and went with a smaller motor instead, I didn't like the width.
 

JerboaJohn

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Jul 29, 2018
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1,126
I always thought there should be an engine size between 50 and 80cc. you know, like 60cc or 65 seems like a good #. in a perfect world there should be something every 5 or 10cc lol
 

The_Aleman

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May 2, 2007
Messages
875
When you get down to it, these are supposed to be bicycle helper motors ideal for long-distance low-speed transportation, and realistically, expecting them to do motorcycle duty is expecting too much. These things have their limits and it's easy to exceed them. Hard to tell people that who have the greed for speed and only do this because they don't have a license to drive for whatever reason.

There's a lot of guys using these as their main transportation and many of them were bicyclists to begin with and therefore are not in a hurry to get anywhere. The HT and HS have plenty of power if you have realistic expectations rooted in the fact that you're on a bicycle to begin with.
 

CrazyDan

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Jul 9, 2016
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1,767
Non kit builders. I’m one of them.

Build the 79cc instead. Still can pass as a 50cc. Way better motor.
Neil will spot a 79cc pred and toss me in with the sharks in the midrange class.
Yeah he's a stand-up dude. He runs the older NuVinci N171, not made anymore. The N360 that came later can't handle even our engines' modest power, unfortunately. NuVincis are also quite heavy and take expensive fluid that they like to leak out when warm :cautious:
It can be, depends on the IGH. A used wheel with an IGH might be under $50 while a brand-new hub itself is $100 or more. NuVincis aren't cheap by any means, they have the most "gears", with 64 different ratios. Oftentimes you have to build the wheel around the hub, too. Not hard to put over $300 into a rear wheel.
"Better" is relative. Sure it's cheaper and easily twice as powerful, but it's also wider, heavier, and has a lower rev range. That rev range limits it in versatility with a single-speed drivetrain. If one uses a CVT to get maximum versatility, the bike is no longer easy to pedal. Long-term term revs over 5K RPM also make the stock flywheel a safety liability. If one doesn't want to chatter teeth off the line, one needs lower gearing or a high-end clutch. I had a 79cc once and I sold it and went with a smaller motor instead, I didn't like the width.
Yeah, the biggest part of me avoiding throwing all my beans at the nuvinci is that expensive as fork magic sauce they require that will cook out at high rpms. I've been looking for an n171 for around 2 years now.... the only ones that pop up I've seen were the electronic shifting ones.
So far my nexus 3 speed has held up, haven't bought the new sprockets yet. Will most likely buy em later today, hopefully it arrives before race day (staton inc is great with shipping so far, not worried). Also, I've got the nommy staton-inc clutch. Bites so hard you'll never wiggle your worm near it.
 

darwin

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Joined
May 26, 2008
Messages
3,015
79cc would be a perfect size motor for a MAB cc wise. The bike could handle it and do everything, speed and hp. I just wish it had a smaller foot print in overall size on the bike.
 

MotorBicycleRacing

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Jul 3, 2008
Messages
2,288
Neil will spot a 79cc pred and toss me in with the sharks in the midrange class.
LOL
Yeah. Only 50 cc four strokes mixed in with China gal racers in Beginner or Novice.
Sadly Nashmoto will not be at this race so you win the 50cc four stroke class.
 

The_Aleman

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May 2, 2007
Messages
875
I learned years ago not to rely on Neil and his haphazard organization of race classes. It's just a charlie foxtrot, and it's not all his fault, really. He just doesn't exactly do a very good job of discouraging setups that theoretically have no business being on a bicycle. Midrange being HF212s is a perfect example. 150CC or higher is considered a motorcycle in Cali, no ifs ands or buts. IMHO, 212s should have never been allowed on the track in the first place, it's ghetto scooter racing at that point. When it comes to modifying engines, it's displacement that dictates ultimate power level. One can only make so much HP per cubic inch.
 
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