In terms of legality and installation, the China doll is better but just looking for raw performance for the price which is better?
China doll can reach very high rpm and with the right setup, 12000 rpm going 60 or even 70mph. Doesn't have great torque and it's either you want top end performance or low end performance and will cost an upward of 400$ on the engine with a lot of work to reach those speeds. Stock is 25-30 mph, perfectly legal, cheaper to get upgrades, very diy, easy to install. Although it's cheaper to do major upgrades, does it justify the work that is required to reach at least 50mph?
Dirt bike engine's are made for rugged environments so you get a lot of torque but it's complemented with a 5 or 6 speed gearbox. Can reach up to 50mph depending on the engine, can push for 60 but depends on weight. Performance upgrades cost a little more and it's harder to mount but stock will get you a great bike. With the torque it will beat up the bicycle so it would be used for well built mountain bikes.
Predator 212 is a beast of an engine, will reach up to 50mph stock (governor removed or bypassed) on anything mainly because of valve float. Not safe at all and the engine is huge, won't fit on any bicycle without heavy modifications. Would either have to mount it to the top back of the bike or get a frame that`s designed for 4 stroke motors (phatmoto). Speed limit without spending 300$ to make it safe is 50mph, if you don't care then you can simply upgrade the springs on the valves and would most likely reach 70 or 80mph.
All these engines cost around the same, China doll being 100-200 with a kit to install and the rest needing modification to install, seeing how some builders make bicycles that can reach up to 80mph with a 50/66cc engine would it be more practical to upgrade the engine overall, mainly would it cost less both in time and money to upgrade than modifying one of these China dolls
I've only spent a moderate amount of time on all three of these engines and no expert in any so take my thoughts with a gain of salt and I'm not going to consider electric because you absolutely need a custom frame to consider reaching those speeds and it just doesn't make sense with how long it takes to charge the battery for 20-50 miles
China doll can reach very high rpm and with the right setup, 12000 rpm going 60 or even 70mph. Doesn't have great torque and it's either you want top end performance or low end performance and will cost an upward of 400$ on the engine with a lot of work to reach those speeds. Stock is 25-30 mph, perfectly legal, cheaper to get upgrades, very diy, easy to install. Although it's cheaper to do major upgrades, does it justify the work that is required to reach at least 50mph?
Dirt bike engine's are made for rugged environments so you get a lot of torque but it's complemented with a 5 or 6 speed gearbox. Can reach up to 50mph depending on the engine, can push for 60 but depends on weight. Performance upgrades cost a little more and it's harder to mount but stock will get you a great bike. With the torque it will beat up the bicycle so it would be used for well built mountain bikes.
Predator 212 is a beast of an engine, will reach up to 50mph stock (governor removed or bypassed) on anything mainly because of valve float. Not safe at all and the engine is huge, won't fit on any bicycle without heavy modifications. Would either have to mount it to the top back of the bike or get a frame that`s designed for 4 stroke motors (phatmoto). Speed limit without spending 300$ to make it safe is 50mph, if you don't care then you can simply upgrade the springs on the valves and would most likely reach 70 or 80mph.
All these engines cost around the same, China doll being 100-200 with a kit to install and the rest needing modification to install, seeing how some builders make bicycles that can reach up to 80mph with a 50/66cc engine would it be more practical to upgrade the engine overall, mainly would it cost less both in time and money to upgrade than modifying one of these China dolls
I've only spent a moderate amount of time on all three of these engines and no expert in any so take my thoughts with a gain of salt and I'm not going to consider electric because you absolutely need a custom frame to consider reaching those speeds and it just doesn't make sense with how long it takes to charge the battery for 20-50 miles
