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General Minitrail Talk
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Unboxing the Piranha Zongshen 212cc Engine
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<blockquote data-quote="69ST" data-source="post: 189365" data-attributes="member: 5"><p>There's definitely a learning curve ahead. This engine is relatively new. I don't know if its teething problems have been solved yet, or not. The Z190 it's built from may be a more durable piece. Electric starters and these little bikes don't play well together for very long; with a kickstarter, that's not necessarily a deal-breaker.</p><p></p><p>There will be the typical fitment issues that are part of any swap to a physically larger engine. And there will be the tuning & gearing to dial-in.</p><p></p><p>At this displacement, even a mild tune should be capable of 75mph & 20hp, easily. With a little more aggressive tuning, hp numbers in the mid 20s don't seem like much of a stretch and that translates into 80-85mph top speed potential...with huge torque. This is serious road power and it's going to reveal any and all shortcomings/weak points of a bike, in fairly short order. A lot of guys are going to find out, firsthand, how quickly 100 miles goes by when you can easily keep up with traffic; then, odometer readings will start to add-up faster than seems possible. The torque is pushing the structural limits of the chassis, which can be addressed. The stock rolling chassis isn't set up for high freeway speeds; it's marginal above 45mph. Again, those capabilities can be greatly improved. And the wheelie-happy nature to which you alluded could be an issue, unless the weight balance and gearing are dialed-in. The bottom line is that these items are best addressed early-on. Careful planning will give one a good headstart...from there, the rest can be fine-tuned. There's also operator restraint, but that's not 100% reliable...lol. My concern is more about the inexperienced owner/builders out there who may draw the wrong conclusions and find out the hard way what happens when components are pushed beyond mechanical limits, or/and the rolling chassis is overbalanced with power and lacks tractability. Big power is fun, as long as it can be controlled. 200cc+ is taking things to the limits...with both engine and chassis.</p></blockquote><p></p>
[QUOTE="69ST, post: 189365, member: 5"] There's definitely a learning curve ahead. This engine is relatively new. I don't know if its teething problems have been solved yet, or not. The Z190 it's built from may be a more durable piece. Electric starters and these little bikes don't play well together for very long; with a kickstarter, that's not necessarily a deal-breaker. There will be the typical fitment issues that are part of any swap to a physically larger engine. And there will be the tuning & gearing to dial-in. At this displacement, even a mild tune should be capable of 75mph & 20hp, easily. With a little more aggressive tuning, hp numbers in the mid 20s don't seem like much of a stretch and that translates into 80-85mph top speed potential...with huge torque. This is serious road power and it's going to reveal any and all shortcomings/weak points of a bike, in fairly short order. A lot of guys are going to find out, firsthand, how quickly 100 miles goes by when you can easily keep up with traffic; then, odometer readings will start to add-up faster than seems possible. The torque is pushing the structural limits of the chassis, which can be addressed. The stock rolling chassis isn't set up for high freeway speeds; it's marginal above 45mph. Again, those capabilities can be greatly improved. And the wheelie-happy nature to which you alluded could be an issue, unless the weight balance and gearing are dialed-in. The bottom line is that these items are best addressed early-on. Careful planning will give one a good headstart...from there, the rest can be fine-tuned. There's also operator restraint, but that's not 100% reliable...lol. My concern is more about the inexperienced owner/builders out there who may draw the wrong conclusions and find out the hard way what happens when components are pushed beyond mechanical limits, or/and the rolling chassis is overbalanced with power and lacks tractability. Big power is fun, as long as it can be controlled. 200cc+ is taking things to the limits...with both engine and chassis. [/QUOTE]
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Unboxing the Piranha Zongshen 212cc Engine
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