20 Most Recent 1998 Honda CBR 900 RR Fireblade Questions & Answers

the fan wont cut in till the engine is very hot,,, well over 100 degrees near to 120! if you realy wont to test the fan out pull the bike up on its stand and leave it ticking over,,, it should take forever before the fan kicks in,,,my bmw has only ever switched the cooling fan on once in 3 years!!!! and that was after standing with the motor running in a traffic jam for 35 minuets !!! but if you wont to find the temp switch pull the plug off the switch and short the two plug pins out with some wire that will start the fan up,,,watch your fingers,,,you only get 5 free fingers on each hand with each body,, and there are no spare parts going cheep?

Hi and welcome to FixYa,

Initially, confirm presence and consistency of spark on the plug ends when cranking. Thereafter check for fuel reaching inside the cylinders by cranking with sparkplugs in place but not HT wires connected. Remove the plugs and note for presence of fuel.

Perform above spark and fuel tests; postback results.

Note: Almost always, the carbs has to be pulled out for a complete cleanup. The old gasoline could have turned to varnish like substance and coated the ports, jets, passage ways and carb bowl/walls.

Good luck and thank you for using FixYa.

Sounds electrical, try checking for spark first. Don't ground the plug to the valve cover because it's made of magnesium and will burn a hole thru it. Or at least that's what I've heard.