Caveat: This post is still early in the diagnosis process, but I wanted to hear from others on this forum.
About a week ago I discovered my 2020 R1M with ~24000 miles wouldn't start. Battery problems were ruled out because I couldn't jump or bump start it. I had it towed to an authorized Yamaha dealer. They drained the oil and found parts; ball bearings, pieces of [connecting?] rod, etc. That obviously means an engine rebuild. The dealer thinks the cause is probably the oil I've been using, specifically its viscosity.
Here is what I've been told so far:
"15w50 is the proper oil [for my motorcycle]"
"These engines are very sensitive to oil weight/viscosity"
(From a non-Yamaha dealer, but very highly rated and services Japanese sport bikes): "The R1M calls for 15w50 however oil viscosity is a range depending temperature and usage. Generally they don't build engines from the factory where if you deviate from the exact oil all of a sudden it blows up. There are tolerances built in."
My first question is WHERE are they getting this because it's not in the user or service manual that I can see. Can anyone cite the page in the manual that says "15w50 is preferred over 10w40"?
Is it common knowledge that only technicians know about?
Should I have been changing to 15w50 in the spring when it gets warmer and back to 10w40 in the fall?
I think I've read all relevant posts in r1-forum, including:
PurpleLion: "YamahaLube synthetic, or Motul 300V (some Ester base but short drain intervals) or Motul 7100 (PAO base with some Ester in additive package), or Red Line (ester base)."
"I believe that 7100 is a PAO (group IV) based real synthetic with some ester (group V in the additive package). Probably very similar to YamahaLube 15W50. It is designed for extended drain intervals. "
ravenracr: "I am also using motul 7100." (Doesn't say if it's a 2015+)
RavenNOR: "Im probly going with Motul 7100."
lionshark: "I use amsoil 10w40...extended drain. Great protection. Love it. Little pricey tho...would consider mutol "
Here's some history:
At the risk of sounding pathetic, I've not used this bike anywhere near as hard as I think some owners have. Always less than 20 mi/h over the speed limit (because the speeding laws in my area are some of the harshest). The bike has never seen red line, and rarely gets near 10,000. It's never been to the track (was preparing to go this year). No stunting and the front tire rarely leaves the ground. I replace the rear tire (michelin power rs) about every 8000 miles (when it still has about 10-15% life left). I just found the first minor problem in the original chain that came with the bike, a stuck link. The sprockets have no visible wear that I can see. I had to replace the original factory-installed rear brake pads at about 22,000 mi, and got both front and rear brake fluid changed (the front brake pad had about 50% of its life left at that time).
I've always used MOTUL 7100 10W40 and K&N KN-204 purchased from amazon, done oil/filter changes myself every 4000 mi.
I forget the exact reason, but I'm certain these played some part in that choice:
Page 8-15 of owners manual: "Recommended engine oil: Full synthetic 10W-40, 15W-50"
Page 2-2 of service manual: "Recommended Type: 10W-40, 15W-50; Recommended engine oil grade: API service SG type or higher, JASO standard MA"
The 600 mi service was done at the dealer I bought it from brand NEW and the 4000 mi service was done at the same dealer it's at now.
Every 4000 mi since then I've called a nearby Yamaha dealer and prepared to have it serviced, but it usually goes something like this:
Dealer: What's the problem with the bike, have you done basic maintenance; lube chain, oil changes (not mentioning type of oil except "full synthetic"), etc?
Me: No problems. Yes, I've done the basics very diligently.
Them: Bring it in at 26,000 mi for valves because it's just going to be a waste of time and money for us to tear it apart to find nothing wrong with it.
I believe this was true up until two weeks ago. The bike felt/sounded/ran perfectly until I hit the start button and quickly degraded in the next several hours, sounding more and more like the starter was struggling. Of course, I waited several hours between start attempts after connecting a battery tender. I never heard any odd noises or felt anything wrong while riding it. There were ZERO signs up until the starter problem. There were no noticeable rough sounds when I tried to bump start it, but by then I think the damage was already complete.
I've done most of the periodic maintenance myself at the correct intervals (so I'm basically screwed because Yamaha is probably not going to recognize that in their warranty decision). I delayed changing spark plugs because when the dealer did them at 4000 mi they said they didn't need changing. I changed them at about 16000 mi and they were in good condition.
Mods: (Will post complete details after I hear Yamaha's decision whether or not to honor the extended warranty.) No mechanical alterations to the engine. Basically nothing that many others haven't done and aren't well tested by companies like brentuning, for example. Nothing like replacing core engine parts or raising rpm limits.