YamahaMark Posted July 6, 2007 Share Posted July 6, 2007 Just got a 1990 FZR600. Its fouling the spark plugs badly and uniformly across all four plugs. The NGK web site says it should have non-resistor plugs. The plugs that are in it are resistor plugs. The NGK web site shows Yamaha using resistor plugs only after about 1995 or 1996. It has a salvage title. I'm wondering if someone put a later engine or at least head in the bike that takes smaller plugs (10mm) rather than the 12mm plugs that are spec'd. Link to comment Share on other sites More sharing options...
daddyjaynal Posted July 8, 2007 Share Posted July 8, 2007 What's the first few letters of your engine number mate? Should be able to identify model from this. 3HE was the early model 600, 4JH was the later model (called yzf600 in he USA). Recommended plug for a '90 fzr600 is NGK/CR9E. Hope this helps. Link to comment Share on other sites More sharing options...
jfrado Posted October 24, 2007 Share Posted October 24, 2007 What's the first few letters of your engine number mate? Should be able to identify model from this. 3HE was the early model 600, 4JH was the later model (called yzf600 in he USA). Recommended plug for a '90 fzr600 is NGK/CR9E. Hope this helps. I noticed that you have an FZR600. I have a '90 and need to change the spark plug wires...I can't find anything on how to do it after I get down to my ignition coil. If you have any insight it would be greatly appreciated! Link to comment Share on other sites More sharing options...
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