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04-07-2014, 10:47 AM | #1 | |
Join Date: Jun 2010
Location: southern Arizona
Posts: 37
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That being said, WOT on most GY6 engines usually runs the rpm's at or near redline and the air cooled engine starts running pretty hot. I have a Taiwanese GY6 scooter that's tuned to run around 6800 rpm's at 55-60 mph and the engine temps usually run 320-340 degrees (CHT gauge). My philosophy is under 350 f and sustained rpm's under 7000 rpm's, no need to worry about speed or actual throttle position. The wife and I have been touring two up riding like this for up to 300 miles a day. Close to 5000 miles and counting. I expect to get at least 25k out of the engine. When running the scooter hard like this I make sure to change the oil every 500 miles and check the valve lash every 1500 miles (only one adjustment needed so far). I had a Yamaha C3 that was fuel injected and water-cooled, it ran WOT for nearly it's entire life. Last I heard it's still running strong. |
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04-08-2014, 07:39 AM | #2 | |
Join Date: Jul 2011
Location: Connecticut
Posts: 493
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2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats. |
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04-16-2014, 03:13 PM | #3 | |
Join Date: Jun 2010
Location: southern Arizona
Posts: 37
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Quote:
Optimum gearing is reaching the maximum horsepower peak at top end speed on level ground. You can change this with higher gears in the transmission, heavier variator weights, a larger diameter rear tire, shortening the variator boss, or any combination thereof. Just like tuning a carb there are multiple parameters and it can take some trial and error to get it right. WOT itself is not always a bad thing, it is the combination of excess heat and too high rpms that you want to avoid. Some motorcycles/scooters are tuned/geared so that wide open throttle causes both, some are not. The GY6 engine is susceptible to higher engine temps when running a little lean, kinda of like a two-stroke, but not as much. Proper carb tuning and optimum gearing can allow a GY6 scooter to perform at a higher level without compromising engine longevity/reliability. |
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