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Post by adoripper on Feb 28, 2012 17:24:59 GMT -5
So I went to clean the carb again (one last ditch effort before getting a new one) and I realized I forgot to open the air cut-off diaphragm area. When I opened it... jellied gasoline and dirt spilled out and the diaphragm itself had been eaten straight through. Do you guys know where I could get a new one?
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Post by mainepeace on Feb 28, 2012 19:16:34 GMT -5
Scrappy Dog sells the air cutoff diaphragm by itself.
Greg
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Post by adoripper on Mar 13, 2012 17:59:13 GMT -5
So I found the air cut-off valve online and ordered it, but when the part arrived I realized that it is the type 1 valve. I need the type 2, and unfortunately it does not seem to be available from anywhere. I checked Scrappy Dog and they too only carry the type 1 for a 50cc. Does anyone know where I can get a Type 2 gy6 150cc ACV?
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Post by adoripper on Mar 17, 2012 19:31:20 GMT -5
I bought a new carb. and installed it. The idle now runs fine... but the scooter will not go faster than 20 mph. I have tried adjusting the carb but it does nothing. I am now at a loss. Any ideas?
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Post by mainepeace on Mar 18, 2012 6:29:10 GMT -5
Swap the main and idle jet from your old carb.
Greg
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Post by nulldevice on Mar 20, 2012 21:41:05 GMT -5
Sorry globs, 'belief' and 'think' may go pretty far in religion and politics but . . . There are no field coils in scooter alternators. The field is created by permanent magnets An efficient series switching regulator would circulate the unused current in the alternator windings and cook them and/or shake them apart. A simple shunt regulator is a good design for this type alternator since the alternator output is what it is and controlled only by motor speed. Since at any one motor speed the output is fixed you need to vary the load to control the voltage output. The execution of the design on our scooters could use a lot of improvement though. say the alt is designed for a 10 amp load with everything running correctly but you lose both headlights (on mine that would equal 70 watts or 5.8 amps at 12v) the r/r now has to USE that leftover 5.8 amps, Sorry but I can't believe these regulators are simple shunt regulators, I think they are series regulators - or in fact field coil regulators - they regulate by controlling alternator output power, which is done by varying the alternator field (fixed) windings with more current for more output. I.e. the more power you use the hotter the alternatore gets and the greater load on the engine. I suppose they may have designed it a different way, but a shunt regulator is inefficient and less reliable in this case.
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Post by adoripper on Mar 28, 2012 13:14:57 GMT -5
I switched the jets out. he bike now runs very well... up to about 50 mph. the idle is perfect. the lean/air mix is exact. the bike accelerates better than it ever has... but at 50 mph it dies. It will run at 50 mph for about 10-15 seconds and then it chokes and sputters until it drops back down to about 10 mph. I just bought a new performance CDI and racing spark coil for it so hopefully that will make a difference but do any of you have any idea what else might be causing this? I was thinking that perhaps when the bike gets to max rpms the stator is shorting out? Is this a possibility? Would it be easier to just replace it rather than test it while running it at max rpms?
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