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Oh Hydro motor, was the recall done?look close at the crossover pipe between the headers, is there a crack on the blue side? has it spent a long time idling? if yes then TB balance could be way off..you do know these bikes like to rev? you don't want to lug it like a Harley.. shift above 4k ..I'd start with a check of TB sync.. easy to do w/a twin max or other vacuum tool..many guys here know more than me, wait patiently.
the left side runs hotter on my EV. Just because.
What's a TB sync ?
the butterfly inside each throttle body needs to be set equally so they open at the same time and same amount.. when closed both should be fully closed.. is the throttle stop screw holding the left side slightly open? OR do the air bleed screws need to be adjusted..this not the best example but can illustrate the mechanism.https://www.youtube.com/watch?v=gVTiUqw8hew
What do your pipes look like ?
The left one is a little but lighter. Just like it's running hotter. I bought it that way with 20k miles, it has 60k on it now.
What is that fairing?
As Pete alludes, the left (S) cylinder "works" harder than the right. Just the same, a good tuneup is in order. Start with adjusting the valves, TPS, throttle body sync in that order.
Could you please explain how the left cylinder works harder than the right ? snip
Because of the unequal 270/450 firing order, the left cylinder fires first, then the right. It's a subtle thing, but the left should run hotter than the right, all other things being equal.
In the service manual it recommends swapping the exhaust pipes side to side every 12,000 miles
But each cylinder must still rotate 720 degrees between ignition firing.....