The gist of this is, now with my E-bike being my main "conern" for riding my Phantom powered Kent Nazz is going to collect a little dust. Recently my girlfriends son - 15 years old and has an interest in bikes, cars, etc. expressed interest in my bike and was wanting to build one for himself to get to and from school, but being a 15 year old has a somewhat limited budget. He's a good kid and is trying to get a job near home so he can make some cash to build said bike. I talked to his mom and she is ok with him building a bike, so I am going to "sell" him my Phantom engine, fuel tank, and other parts that are on my Kent by trading his labor for them. Obviously nothing too crazy, but he is going to help me fix a retaining wall that is starting to buckle and do a little yard work for me as well. His mom already bought him a Hyper cruiser on my recommendation for his upcoming birthday. He has to figure out how to buy the wheels and a few other parts to upgrade it, and I have a bunch of surplus parts I can donate for things like the brakes.
I am going to convert my Kent Nazz back into a pedal bike for now, and I may look into converting it to an ebike, OR using it for a new build idea I have, which is the purpose of this post. Mainly, I am not sure if my Nazz would be a good bike for said idea since the frame space is a little limited.
I mainly want to get away from the standard bicycle engine kit 2 strokes, aka "China Dolls" and all of their variations and just get into something a little different. I really like the idea of using an AX100 clone engine to make a "shifter" bike, but those are a bit on the big side, especially for a road bike frame, and I want to avoid major frame modifications.
That leads me to the KTM 50SX style engines, aka the little 50cc 2 stroke pit bike motors. I know that others have used them in the past for motorized bike builds, so it's nothing ground breaking. Link to Aliexpress for an example. I specifically want to use the air cooled variety for simplicity and safety.
The upside to these little engines is, they make great power for their size, with the original KTM design making 7hp and most of these clones claming 8.5-ish HP at around 10k rpm. The downside is, they make zero power below about 7000rpm. They use an oil bathed centrifugal clutch that can be modified with different springs and other modifications to alter the engagement RPM to ensure they end up in the power curve, and they are designed to slip without eating themselves alive. I have found some great information on said clutch changes in order to ensure the engagement point allows the engine to get into it's power curve and not bog out.
Parts are also cheap for them, and there are 9-12 tooth sprockets that drive a 415 chain. Making a motor mount solution would also be relatively easy.
The only thing I ask people to understand is that this is just a tinker project. Just something fun to create and problem solve using a non-typical engine.
Until I know the primary reduction ratio on the engine, something I am actively looking for, I can't really plan out potential gearing combinations. The water cooled engine would be more fun, and the cooling system for them is about 50 bucks, but they also make quite a lot more power and even higher RPM (12-15hp at 12,000rpm) and I am not quite certain I want to try that on a bike. The goal isn't really speed.
I am considering combining one of those little buzzers with a 3 speed IGH jackshaft in order to be able to manipulate gearing for climbing vs. flat ground.
I am going to convert my Kent Nazz back into a pedal bike for now, and I may look into converting it to an ebike, OR using it for a new build idea I have, which is the purpose of this post. Mainly, I am not sure if my Nazz would be a good bike for said idea since the frame space is a little limited.
I mainly want to get away from the standard bicycle engine kit 2 strokes, aka "China Dolls" and all of their variations and just get into something a little different. I really like the idea of using an AX100 clone engine to make a "shifter" bike, but those are a bit on the big side, especially for a road bike frame, and I want to avoid major frame modifications.
That leads me to the KTM 50SX style engines, aka the little 50cc 2 stroke pit bike motors. I know that others have used them in the past for motorized bike builds, so it's nothing ground breaking. Link to Aliexpress for an example. I specifically want to use the air cooled variety for simplicity and safety.
The upside to these little engines is, they make great power for their size, with the original KTM design making 7hp and most of these clones claming 8.5-ish HP at around 10k rpm. The downside is, they make zero power below about 7000rpm. They use an oil bathed centrifugal clutch that can be modified with different springs and other modifications to alter the engagement RPM to ensure they end up in the power curve, and they are designed to slip without eating themselves alive. I have found some great information on said clutch changes in order to ensure the engagement point allows the engine to get into it's power curve and not bog out.
Parts are also cheap for them, and there are 9-12 tooth sprockets that drive a 415 chain. Making a motor mount solution would also be relatively easy.
The only thing I ask people to understand is that this is just a tinker project. Just something fun to create and problem solve using a non-typical engine.
Until I know the primary reduction ratio on the engine, something I am actively looking for, I can't really plan out potential gearing combinations. The water cooled engine would be more fun, and the cooling system for them is about 50 bucks, but they also make quite a lot more power and even higher RPM (12-15hp at 12,000rpm) and I am not quite certain I want to try that on a bike. The goal isn't really speed.
I am considering combining one of those little buzzers with a 3 speed IGH jackshaft in order to be able to manipulate gearing for climbing vs. flat ground.
