650max Posted November 26 Report Share Posted November 26 (edited) What does the sensor do in the hose between the crankcase breather and airbox? Is it just passive and monitoring air flow or something or is it active and operates a valve or similar? I've just replaced the breather assembly on the back of the block due to a little oil mist in the airbox, it was well gunged up with cottage cheese. Immediate effects have been much smoother running at low revs with a cold engine, it was a bit stuttery before, gearchanges - on/off throttle is smoother and most noticeable, idle speed has dropped from 1200rpm cold/1000rpm warm to 1000rpm cold/~800-900rpm warm. Need I do anything with the inline sensor or is it best left alone? Edited November 26 by 650max Grammar Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted November 27 Report Share Posted November 27 It's not a sensor, it's a breather hose heater, designed for use in extreme cold climates to prevent the crankcase fumes from freezing. Definitely not needed in the UK and usually causes more issues than it solves 1 Quote Link to comment Share on other sites More sharing options...
650max Posted November 28 Author Report Share Posted November 28 Thanks for that. I'll leave well alone. Quote Link to comment Share on other sites More sharing options...
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