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Glad to hear from you Mike.
Re: the different models SUZUKI installed the 250 engine in several different models from the early 80 until present
they are :
GN250 , TU250 , GZ250 , Marauder 250 .
I have read power ratings ranging from 15.2 lbs torque @5500 rpm and 22 hp @ 8500 rpm to
14.8 lbs torque @ 7000 rpm 20.6 hp @8000 rpm.
gear ratios are the same only wheel sizes vary but so also do the tire profiles.
dry weight ranges from 285 to 305 lbs
there are some jetting differences 115 main vs 120 main jet
I have a tach so I know my bike will rev to 8000 rpm in 4 th and 7750 in 5th because I have done this many times.
It may even hit 8000rpm in 5th but I never have enough space to try it ( usually 1/2 mile ) clear max.
I have checked the spark plug it was a light tan color .
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sds4
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