I "Fixed" my Yamaha ones today.
At over £300 you would think they would be the worlds best ever heated grips, but they look like an expensive set of Oxford grips (Although admittedly have survived rain, I understand the Oxford ones pack up the first time they get a sniff of moisture)
Anyway, apart from being reliable they were not great, obviously they fit well (as to expected for model specific items) and they look good quality but the RHS runs far hotter than the LHS.
This is not a slight difference, last weekend I had to keep taking my hand off the RH bar as even with fairly thick gloves on my hand was burning, whilst my left hand was still too cold.
I guess this is because the LH grip is attached directly to the metal handlebars which wick away all the heat, whereas the RHS is onsulated by the plastic throttle tube, now why the Yamaha engineers could not either have provided some insualation on the LH grip, or provided more power (or windings) in the LHS grip is beyond me, but then I am not clever enough to be developing the worlds most expensive heated grips so what do I know
Luckily it turned out the dealer had not stuck loads of glue (none to be precise) under the LHS grip so it wiggled off really easy and I applied a couple of layers of lumbers heat reflective tape to the bar.
Hopefully this will even up the temp a little, and I can always remove the grip again and try a bit more insulation if need be.