Question about 1994 Suzuki RF 900 R

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Hey guys! My rf900 , when in idle, if I leave her for like, 5 minutes, stopped, the temp gauge will touch the first red indicator. (revs around 1k) Also when in heavy traffic, if I do lots of stops and/or hold around 25mph, the temp meter will most likely touch or stay very close to this first red indicator. Right now I took off the Thermostatic Radiator Valve (TRV) from the RF radiator, now the temp gauge takes a little more time to touch the 1st red indicator but...after a few minutes, it still does... The fan always kicks in when the temp pass 1/2 of the meter...i can hear it and if I put my hand in the left side of the air vent, i can feel the hot air coming thru... my ideas: 1) the fan , despite the noise it does when running, it isnt moving enough air it was supposed to, maybe, when in 1996 2) dirty radiator tubes? (this bike was "abandoned" for like 1 or 2 years, NOBODY rode her...now, i´m the lucky guy who bought... : )

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Flush the radiator. Use something like Prestone's radiator flush for cars. then refill with MOTORCYCLE COOLANT. this is important. the manual says you can use any coolant compatible with aluminum radiators. I did this and replaces 2 radiators before I figued it out. if this doesnt work, have the radiator tested. Also, I had a problem with the fan melting and not even knowing it. muzzy's makes a 6blade aluminum fan cheaper than the stock plastic replacement.

Posted on Sep 14, 2010

  • RF9 God Jan 18, 2011

    If this is only occuring when ambient temps are 30 deg C then it's normal, if it's only occuring when temps are 20 deg C then try flushing and replacing your coolant. The allen headed bolt just below the water pump drains the system, you must flush through with tap water from the header bottle under the seat until it runs clear when the engine is cold. Allow it to fully drain and refill with a 50/50mix of universal antifreeze as suggested above. If this is occuring even on sub 20 deg C days then your valve clearances need doing first and then, if these are within limits, you have a weak mixture (unlikely unless you've been fiddling). Most likely valve clearances.

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