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GT550 flywheel rotor keeps frying

Posted: Thu Oct 30, 2014 2:03 pm
by NateGT550
Hi,
Earlier this summer I bought a 1973 GT550. Barn find, 7,000 miles, had been sitting indoors for the past 30 years. Great compression, clean, (great petina) beautiful. My mechanic and I got rid of the points, and put on the Boyer Bransden (sp?) electronic ignition, got a new voltage regulator, and rectifier. After about 300 miles of riding, I fried my magneto rotor. I purchased one online that tested at 10.4 ohms, which I know is sufficient according to my Suzuki 3 cylinder 2-stroke manual. I popped the new rotor on and the bike was flying! Battery charging fine, running smoothly, and performing great. Again, after a week of riding, the day came where the performance was declining, and I noticed that the battery wasn't charging. I popped off the rotor, and it was fried. 0 ohms. Dead. I need to solve this problem before I purchase another rotor.. Any ideas?

Re: GT550 flywheel rotor keeps frying

Posted: Thu Oct 30, 2014 4:03 pm
by jabcb
Suzuki had a problem with rotors on early GT550s with Nippon Denso alternators.
Check to see if this issue applies to your two rotors.

http://www.ozebook.com/compendium/techb ... mpress.pdf

Re: GT550 flywheel rotor keeps frying

Posted: Fri Nov 07, 2014 3:19 pm
by NateGT550
Jabcb, I appreciate the help. I just put the bike in storage for the winter months here in Northern Michigan, and flying out tomorrow for the Miami sunshine.. This spring when I get the bike back out, I'll be sure to stay away from the ND rotors. Once again, Cheers.