It is not about lean mixture. I have programmed it to be normal and in rich side without any change at the annoying noise. So it is something mechanical. I am still under investigation. I believe that I will solve it 1-2 months if is not something in gearbox gears or main engine parts.
The obvious candidates for rattle are the standard cam chain tensioners. You can swap the standard ones out for a slightly larger step which positions the stepped section closer to the chain.
I have already checked it. I made spacers at lathe for both tensioners starting from 1mm until 7mm. But not any difference. Noise remains exactly the same.
I am already collecting all the tools and parts that are necessary to be replaced and soon I will have news.
Sounds like you've been quite thorough. I'm used to boxers rattling. They're noisy engines at the best of times and usually, it's nothing to worry about. The old air heads were by and large, much quieter. My old R100RT went on for years and was much quieter and my RS or GSA 1200 bikes.
They are not camshafts or gears. Already checked mine several times, and dealer replaced gears and needle bearings under warranty. Rattle remains exactly the same. The way to reproduce the sound and find the source is one. You need to put the bike to Dyno and accelerate it under load and try to find the source. It is my next step before check clutch and cam alignment.
It is not damage at the coating. It is just sign when a metal touches another metal. All the engines are like this. Don't worry. At 1250s, the annoying noise is not from camshafts like LCs. If camshafts were worn you would have noise at all rev range and not only under load.
All the other bikes that you tested were 1250s?Thanks for the reply but my last one did not have this noise , so it’s a bit of a worry . We did the same test at similar rev with my mates bike and again no noise . Let’s see what they say
I had the same on my 2021GSA. The rattle on the left side got progressively worse when on a Euro tour. It sounded like typical top end cam rattle. Took it in for its 6000 mile 12m service and they found left and right cyl cam cams were worn. All camshafts and followers replaced there and then, with no hesitation. 6000 miles and 12m on, and all is good.
Do you have any photo with camshafts? How much worn were?
Very interesting... Could you please ask your dealer if there is any official description because my dealer doesn't accept the problem? And I have 1 month more warranty.
This was Sept 22, so the tech guy will have probably well forgotten my bike by now.
