Posted September 25, 200915 yr Hi, I've had the head off my bike because it didn't run on no. 2 cylinder & coolant was mixing with the oil. The head was fine (no warping) & no valve leaks so I put it back together with a new Yamaha head gasket - everything correctly torqued. Now it doesn't run on no. 4 cylinder & coolant's still in the oil. Anyone know if the heat exchanger is known to leak on these models ? Any suggestions appreciated - thanks.
September 25, 200915 yr Iff it,s any help an R.1 i owned had a sort of same problem,on the Yamaha in the middle of the sump pan there is a hole,if you took the sump pan off you,d see a metal tube coming from within the engine ,which is an overflow designed to let out excess coolant out,via the middle of the sump pan to the ground,if the rubber sealing washers on that tube are perrished coolant will mix with the oil,. worth a look,..
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