chad m

Me too, love my '15.

Good call! Check the air filter, perhaps a small critter has made a nest in there.

I'm using the 5 in my Racing, the 6 was just a bit too cold.

Having just gone through this, I ended up buying a length of 2.5mm viton oring cord and then just made my own orings, using a dab of superglue to bring the ends together. It works great, its cost effective and you'll get to use your math skills for calculating the circumference if you haven't got one of the original o rings to determine the length of cord you require.