danielflo216
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I've got a cheap GX200 196cc clone type thing. I've done a lot of upgrades to it, such as jets, filter, header, 36lb springs, billet rod, removed governor, cam, the list goes on. Unfortunatley I haven't got to doing the flywheel because around the time I bought the engine I had the most hobby money to throw at the motor (so thats when I bought pretty much all of my upgrades). Apparently back then I didn't understand the importance of a decent flywheel so haven't got to buying or installing one. I start my engine up every now and then and give it a rev. I've got a cheap chinese tacho (the ones that you wrap around the plug boot) and I've set it to the 'spark every revolution' setting because I believe these engines have a wasted spark. When I rev it at absoloute max (not connected to wheels) the tacho reports the engine flattens out at around 3000rpm (give or take 50 or so rpm) and wont go any further. I've been at the track and heard go karts within the same modification class as mine and the '3000rpm' that my tacho reports sounds close to other similar engines 6000rpm. I can't trust the rpm based off sound alone but I also can't trust chinese tachometers because they are notorious for their defects and misreportings. I know that some coils have a built in limiter at 6100rpm, so it seems obvious to assume my tacho is reporting half of the engines actual rpm, and it was actually hitting a limiter at 6000rpm. I was wondering if there was any chance my chinese motor either had an electronic limiter in the coil or just had a dodgy coil that couldnt keep up with the rpms either or because of the weak magnet on the flywheel. I lean towards the latter because an electronic limiter in a cheap engine seems unlikely, but if it was a dodgy coil it should be sputtering around near redline, not hitting a stable and consistent ceiling. I've been watching Red Beards Garage where he runs a Ghost 212cc engine that comes built with a 6100rpm electronic limiter inside the coil (linked video and time at bottom of thread) and when he was revving it off the limiter it sounded absolutely identical (apart from the exhaust note because of the different headers) to how mine sounds when I max it out, and at what sounds like at the same RPM mine bounces off, down to the time intervals between and shakiness of the engine when it is being limited.
What do you guys think is the most likely cause of this rpm ceiling because I doubt such a cheap engine would come with a relatively expensive electronic limiter.
If it is the coil I am assuming the remedy is to buy an aftermarket or stock coil from ebay, unless there is another way?
Red Beards Garage video on the Ghost (skip to 14:49):
What do you guys think is the most likely cause of this rpm ceiling because I doubt such a cheap engine would come with a relatively expensive electronic limiter.
If it is the coil I am assuming the remedy is to buy an aftermarket or stock coil from ebay, unless there is another way?
Red Beards Garage video on the Ghost (skip to 14:49):
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