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Once could imagine an impurity in the alloy cast, or a fissure caused by a specific condition. Piaggio would know as their dealer would have reported the failure.

I found a video demonstrating how alloy is used in foundry and later machined; this is for wheels, but the principle is the same for anything alloy I believe.

Yesterday, during the debrief of the GP in Jerez, I asked the journalists and was told the decision to not introduce the new front tire in 2025 was also condoned by the teams. There are going to be more debriefs today, and while in a live stream, I will try to confirm if possible. I agree the pressure limit is a an impediment to the spectacle, and I don't understand why they would not change that front tire.

The Gresini team seems to have drawn the lottery, one Marquez after the other are bringing them up. Considering they are one of the least sponsored team, it is quite the performance.

Some are thinking that MM is working hard behind the scene to have AM in the Ducati factory team. Obviously, FB has a valid contract for 2026, but it could be possible to see AM in Factory Ducati from 2027. I don't know, it feels like a long shot, but looking at Alex Marquez performance since the beginning of the season, it is not impossible.

There's a lesson learned here. For all of us. I am always listening for changes with all my vehicles. Anything that sounds different from before, and I am off to the shop to investigate. Thus, I captured two problems on my 911, before they could evolve and cause damage: the left bank distribution chain tensioner; since it works with oil pressure, there is a spring that compensate when you start a cold engine. I heard the sudden rattled when starting after long pauses, and replaced both tensioners. Alternator; started to make some noise, probably the bearings, it was still working. If you hear anything out of the normal, I think it is worth investigating sooner than later. This guy said he inquired with the dealership, and they told him it was nothing to be worried about, I think that was a big mistake to take the reassurance at face value. A new noise that wasn't there before, he should have asked them to open the bike and check it out.

Bagnaia has an issue with this year's sprint race Ducati configuration with the small reservoir. He said that he is working to get back the feeling. Tomorrow should be different, hopefully. Bagnaia likes Jerez. Fabio was actually delighted to manage pole position with a new track record for the circuit. He said that he had to pull all the stops to stay in front, it was fill or kill. Unfortunately, he does not know why he was performing at this track. Tomorrow will most likely be different. He is not going to throw it away. Zarco, and all the Honda team have to compose with a lot of vibrations from the rear. He said that he was not comfortable with the bike, and indeed, he went down. He was the only one using medium tires when the rest used soft. We can anticipate that tomorrow will be the same, as shown with Fabio, it is almost impossible to overtake outside the racing line on Jerez.

That front tire was going to debut in 2026, however, since development has been frozen until the start of the new regulations in 2027, that front tire will not be introduced to maintain consistency for all teams. They will continue with the 2024 Front tire until the end of their tenure. Hopefully, Pirelli will not fall in the same trap. I found this (english) article about the front tire that was meant to be introduced in 2025. https://www.paddock-gp.com/en/motogp-en-2025-la-donne-pourrait-changer-avec-larrivee-annoncee-par-michelin-dun-pneu-avant-plus-gros/

True. When my company was still manufacturing our logging tools, I visited a machine shop, where all the elaboration was driven by CNC machines. One operator told me the major issues were when something happened and an emergency shutdown occurred. Restarting at a given step, when the piece getting machined is not completed, often leads to discarding it. The way they test today, is they check parts randomly, not systematically. But the faulty part should have a cast number, and in theory, this should help Piaggio to determine if this could be a recurrent fault.

This is what the media have said. Including official Michelin statements which have not been contradicted by Dorna either. Why wouldn't Michelin introduce the tire that solves the current pressure limitations? there is no rationale for not doing it. In any case, there is more suspense in trying to guess who will be the next pope than predicting who will win the world championship.... lol...

I have a little bit of experience with foundry, as it was part of my training at school. We did some casts, but with sand molds, not the modern techniques they now have. I believe those light alloy parts are pressure cast. Even if the entire process is run by computers, a bad batch can always happen.

I found this video extremely difficult to watch, for multiple reasons, but I am not going to elaborate. What do you think happened? is the alloy at fault? an issue with the casting process? it could only be a defect, not the result of mechanical fatigue at 500 miles....

Opinion about Michelin tires aside, I would have a hard time believing that them, Michelin, would have been able to enforce such a directive without any fact or proof to provide to Dorna to have them endorse the decision. As I type this, there were some pilot's opinions on Viñales' declassification, and every one of those that expressed their opinion approved the rules have to be enforced. There are several videos that have reiterated that Michelin came up with a modified design that would have done away with the 1.8 bars minimum limit for 60% of the race, unfortunately, Dorna has not accepted to have the new tire introduced, for undisclosed reasons, upon which we can only speculate. If excepted for the Maverick incident, those rules have been fairly followed in the field, we will remember that Marc Marquez used his brother to reheat is front tire. I don't know if that new front tire will ever be used, given that Pirelli is taking over in 2027. Anyhow, the front tire pressure is unlikely to change the pecking order of 2025 and 2026. Tech3 admitted they set the front tire pressure thinking Maverick Viñales would remain in the middle of the pack, which is frustrating for everybody, since he exceeded expectations. He declared afterward that he was aware of the low front pressure issue, but he felt it was not his problem. I am hopeful that 2027, with the 850cc engines, reduced aerodynamic appendices, no more ride height devices, reduced number of engines, 100% synthetic fuel will add some much-needed competition.

Gotcha! what about the shoes?

I am currently going through the same ordeal... I own a V11 Le Mans (2004), a Quota 1100 ES (2000), and would like to acquire a Stelvio 1200 NTX (2013) which I have already sourced and am lacking the physical space to purchase. It's all academical anyway; how can you justify owning several motorcycles? what would be the rational explanation, since you can only ride one at a time? The pleasure of possession? I have them, so they are mine, and I can do what I want with them? I like to think of it in the practicality way. I don't do leisure motorcycle riding. I ride my bike for errands, whatever those maybe. Here in Texas, it is actually the standard practice to have one or more "weekend vehicle"; you have your commute vehicle, and then the leisure pleasure one or ones. My Quota is my daily rider. Whatever I need to do, it gets first call. Short or long distance trip, the Quota has just filled in the spot. The V11 is different, and has been a purchase from the heart, for multiple reasons. When I was working in Sicily, the Work overs/completions Superintendent of Agip who was one of main work provider owned one. At the time I was running a Harley Davidson Sporster, the only one on the island, possibly. I took to the Le Mans immediately. I had a company car, but I left it at the base and used my Harley for everything. Rain or shine! I never had time to purchase a Guzzi, because I got transferred. I decided to get one now to make it a late dream come true. The Stelvio 1200 NTX is the second Guzzi I sought. It was replaced wiith the Quota since the first Stelvio I checked had the seat in the highest setting, and at the time, I did not know there was a lower position. The Stelvio 1200 NTX being a diplodocus, you don't want to drop it if you need to move it around in your garage. I have posted enough photos of how I am setup, and I need to move two motorcycles to get to my car. With the Stelvio, it would be three. The Stelvio would be the long distance runner. Not that I have not done that on the V11 already, or the Quota; I have done the Motorcycle Grand Tour of Texas since 2021, and I have used the V11 up to 2023 to make all the stops. The Quota joined the Le Mans in 2024, so I used both. This year, I have so far only used the Quota. However the Le Mans comes out for errands too, since I use the Quota for the tour. So what do you tell your wife? does she need all these handbags? does she need all these shoes? how many perfumes can she wear at any one time? how many coats, outfits does she need to own, some of them only came out once from the wardrobe? The Guzzi passion is just like a religion. Once you have adopted the cult, you need more than one catechism to understand its wisdom.

I went to the former MPH Cycles Inc. place yesterday, with the Le Mans just to stretch its legs since the Quota seems to be the one I always revolve around. It is still operating as Mike Haven Automotive. I don't know if Mike still has an interest in that place, but it is open and running for cars exclusively. The Hempstead setup does not look like a real business, rather like someone with some extra space offering services. When I went there, Davey was working on a BMW, on a little patio in the front of a shed. This is why I got the feeling they were winding down their activity. Sort of selecting what they want to do, and how they want to do it. I may be wrong, but the new setup does not give you the feeling they want to resume what they used to do at the previous location. Davey is the one working on the bikes; Even at the old location, Mike seemed to only work on the cars. But he did provide expertise when necessary. The distance is not the main drawback. But they are not in town, they are in the middle of nowhere, surrounded by farms. I understand they are working from home, it is very convenient. It also probably fits their new business model. But looking at it, they are not setup yet.

They don't use air, but fat from your love handles to inflate it.

You still get free air on every gas station on the highways in France. They also have rest areas, with tables, so you can take a break and relax a little bit. None of the gas station around me have that. And yes, free air does not exist at gas station, you needed four quarters to inflate, with most of those stations out of order. There is an exception, though. Costco offers free air to anybody. So you can as it was meant to, fill your tan and check your tire pressure.

He did not learn to say Guzzi properly, but I will forgive him. This Guzzi 2013 is a mirror copy of the one I am after, pending the sale of my Quota... This guy has published a lot of videos about the problems he experienced, which are very educating to me; I did not know the 2013 Stelvio had a clutch recall. I did not know about the throats wearing off either.

Did that on the Quota... the shift lever height was better, but it kept coming out from the gear lever.... Now that I have installed a rubber insert in the foot peg, it is a better fit...

This is exactly why they video is educating; because those expansion chambers should be designed to fit a very specific type of engine, targeting a narrow rpm band. I purchased mine from the manufacturer of my engine, and it was supposedly tuned to that engine type. However, nothing was specified on what rpm range it was designed to work best. All the guys from my moto club installed those chambers on their bikes, and it now occurs to me, the only certainty was the unbearable noise produced. As to the increased power, no idea....

The interesting part came towards the end of the video, and has nothing to do with the RG 500.

Well, I had never dug into where those expansion chambers came about. All I know, is that I had a Gitane Testi when I was 14 years old, and I purchased the expansion chamber sold by Motori Minarelli for my 49.9cc engine. I knew the reason and the principle about it, but I never imagined it came from Germany.

Here are the photos so you can judge; the BMW one fits both sides, while the Quota has a distinct part number for the left or right side. I was amazed to find out these are directly listed from BMW Motorrad, and the catalog have the spare parts available for ALL their motorcycles, including the vintage ones... Obviously, BMW has the financial strength to do that. You can still order pistons for your R-90S from the 70's....