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Post by 90GTVert on Apr 3, 2009 19:02:41 GMT -5
The thumb screw is the idle speed, the other screw should be the idle/pilot mixture. Warm the scoot up. Set the idle speed so the scooter idles alright. Move the mixture screw 1/4 turn at a time, giving it a minute to level out between each adjustment, until the engine revs the highest at idle. Turn the screw 1/8 turn toward rich (in) to be on the safe side. Then re-adjust your idle speed thumb screw to around 1800RPM or whatever you feel comfortable with without the wheel spinning at idle.
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Post by pgguy2003 on Apr 3, 2009 20:38:23 GMT -5
sounds good, imma try that first thing in the morning cause im still getting some hesitation after a WOT run. I got two days of scootering to go before 3 months in Ft Mccoy, and then 12 months in the desert! so i gotta make them count! On the plus side when I get back in a year or so. I will be breaking bad and building a sick scooter.
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Post by pgguy2003 on Apr 4, 2009 18:09:32 GMT -5
Well the scoot let me down again today, I thought the problem was gone. but it reared its ugly head again. Unloaded frm the truck in the city, rode two miles to Wawa aired up the tires everything was good, road another 5 miles to my cousins house, he hoped on his scoot we rode another 5 miles and BAM....running like crap again. Whne you first ride it after a cold start its great has plenty of power and will acell all the way up. Once it is fully warmed up it loses power after the first WOT. Just no power whatsover sputtering to get above 10 mph. I dunno what the problem is, my guess is ignition system is bad. Back to my original thought of coil/cdi I guess. To bad tomorrow is sunday and then im gone on monday:P See ya in a year and a half scooter!
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Post by 90GTVert on Apr 4, 2009 20:44:21 GMT -5
Here are some test specs from a Yamaha service manual...
Remove the coil. Attach the + lead of a multimeter to the coil's termina. Attach the - lead to the coil's base (the part that is bolted to the frame to ground). You're looking for .32-.48 ohms with the multimeter set to ohmx1.
Connect the + lead of a multimeter to the copper inside the spark plug wire. Connect the - lead of the multimeter to the coil's base. Look for 5.68-8.52k ohms.
Disconnect the pickup coil's connectors. Using a multimeter set to ohmx100, probe the white/red wire with + and the white/blue with - . It should read 248 - 372.
Disconnect the magneto's connector. Using a multimeter set to ohmx100, put the + lead on black/red and the - probe on green/white. It should read 640 - 960.
I don't know of a way to test the CDI.
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Post by pgguy2003 on Apr 5, 2009 21:34:15 GMT -5
Can you believe that the whole cause of this was the battery being dead? I replaced it with the one from my neighbors motorcycle and rode it for 30 miles tonight. runs great best 200 dollars i ever spent
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Post by 90GTVert on Apr 6, 2009 5:35:10 GMT -5
Glad you got it fixed. Hopefully you have Stabil in the tank or you've drained the gas/oil since you'll be away.
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