beta200290 Posted September 20, 2016 Report Share Posted September 20, 2016 Hi I have an 11 Evo 290. When using the mapping on the more subtle setting the bike seems to be pinking inthe lower gears. I what can I do? Quote Link to comment Share on other sites More sharing options...
billyt Posted September 21, 2016 Report Share Posted September 21, 2016 Does it "Pink" when you roll on the throttle or off the throttle? Quote Link to comment Share on other sites More sharing options...
beta200290 Posted September 21, 2016 Author Report Share Posted September 21, 2016 Already using super unleaded with putoline 2 stroke. It is when coming onto the throttle after low revs. Quote Link to comment Share on other sites More sharing options...
beta200290 Posted September 21, 2016 Author Report Share Posted September 21, 2016 Was thinking it might be timing as its only when using the mapping...? Quote Link to comment Share on other sites More sharing options...
dadof2 Posted September 21, 2016 Report Share Posted September 21, 2016 (edited) Try regular octane fuel to speed up the combustion. What you have may not be usual pinking. At low RPM in a big cylinder with soft / retarded mapping the burn can be slow and incomplete when the next new fuel air charge enters the cylinder, this causes sort of "bonging" and uneven running not unlike pinking. Squish clearance may need checking. EDIT - If you are running a lean oil mix and your piston / rings / bore is worn you could be getting blowby into the crank case contaminating the new incoming charge. This can cause the similar symptoms Edited September 21, 2016 by dadof2 1 Quote Link to comment Share on other sites More sharing options...
beta200290 Posted September 22, 2016 Author Report Share Posted September 22, 2016 Thanks a lot for the suggestions, will try some 95 next time. Mixture is fine and plug is the correct colour, and bike has loads of compression so don't think it's down to wear! Quote Link to comment Share on other sites More sharing options...
dan williams Posted September 25, 2016 Report Share Posted September 25, 2016 (edited) Could be air leak. A friend's EVO blew out the case gasket below reed housing due to loose case bolt. Of course check timing and carb. Kehins are notorious for blockages in the piddly little bleed cirrcuit behind the slide. Edited September 25, 2016 by dan williams Quote Link to comment Share on other sites More sharing options...
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