Yeah he told me the diaphragm had 2 holes on the first day, before I complained about it. He also said another guy with an 1100 had his bike in at the same time and he also had ruined rubbers.Pictures never do justice, but it does look a little on the lean side. For everything you’re doing, I wouldn’t be too concerned with the engine being ‘ruined’. You’re just playing to either side of stoichiometric (balance). Leaner gives a bit more power. Richer is a bit easier on parts. Carbs are analog devices, so ideally you would fine tune the jets and screws as you rose in elevation. The manufacturer is just saying it’s not THAT important until you hit XXXX ft.
The problem is, many mechanics get a little ‘Righteous’. “Who does this jerk think he is, reading something on the Internet and telling ME how to do MY job? Hey buddy! Oh, look! Your carb rubbers are ruined! Take THAT for a ‘Jerk Tax’...” Only they’re usually right. Most customers have no idea, and when things go wrong, they blame the mechanic for following their instructions. This guy might have it in his head now that he’s right and you’re wrong, and will just punish you for any further ‘annoyance’ you cause him.
Is there another mechanic around with a good reputation? Unfortunately, even the older ‘Shadetree’ retirees are outgrowing carburetion. Otherwise, have a discussion with this guy. Tell him you’re sure the dry, whitish plugs and popping are the sign of a lean condition, and ask if it would hurt anything to adjust the jets to the richer side. Appeal a bit to his ego, in that a mechanic of his talents could make that change so fast you’d barely even notice it was apart. Judge the reaction you get. If he’s set in his ways, you may not get anything other than more bills out of him.
He was telling me right when I made the appointment about the need to go leaner due to elevation. His exact words I believe we're "you actually need to lean it out a little at the top end." At the time I thought he was just saying that he was going to go a little leaner than the dyno jet specs called for. which I was willing to go along with him because I understand there's less oxygen up here and he's the expert.
But now I'm wondering if he was actually saying that he was going to literally make it leaner than it already was in its stock setup.
But it runs worse now and the question is too lean or too rich. I'm not sure why he thinks the plugs look dark. He made his judgement based on that.