wot
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Posts: 8
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Registered: Aug 30, 2023 3:06:30 GMT -7
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Post by wot on Sept 7, 2023 15:53:10 GMT -7
Hi there this is my first post here after buying a 2021 yamaha MT10 soth 14500KM. Ive done about 1000km since buying and the engine has a major failure. So story is...
I was riding quite hard sifted 3 gears with the quickshifter clutchless just before redline and sortly after the engine had a knock and weird vibration cruising in a curve in 4th arround 6500revs. I got to a stop and when reving from neutral it would knock/rattle wich seemed from the base of the engine. I did about 3 km more to try and get home slowly when the motor went boom and lost all motor power so i pulled clutch and stoped the motor at that moment it sounded like a chain had flew and chewed in the engine for a second. I was in 6th at 100km/h at that moment. No holes in the block at that point... i started it back for 2 seconds just to know if what i heard was real and the motor was clanking like crazy like sppons hitting each other but it started fine. I since then never started it back up .
Where im at right now scratching my head and being anxious to find what is really the problem.
-motor oil is clean as a whisle , flushed it all
-antifreeze all clean flushed it all
- clutch cover off all good no loose everyclutch there with 3 front springs
-water pump off no play at all
-magneto cover off everything is there and tight
-I am currently at the 4th cylinder with plug out and dont see anything wrong.
-timing cover off and left side tention on the slider all good and tight
-oil pump chain drive kind of loose when touching it from left to right but they are firmly on top and bottom sproket ( there seems to be no tensionner on there)
What my next steps are removing all 3 plugs left and see if motor turns nicely with ratchet. Have myself do a compression test on all 4 cylinders if all passes them im removing valve cover and removing cams to inspect all valve springs and stuff upthere.
I am VERY anxious that it might be a crank bearing since seeing alot of threads blowing holes trew the blocks but has anyone have insight or disasembled these bikes before finding a similar problem HELP !
(Initialy My input is that when i was reving i might of had a tad overreved because it never hit rev limiter once all those 3 gears i might of floatted a vavle or broken a spring up in the head but i see NO METAL SHAVING WHAT SO EVER something sounded like something broken and was crunched for a second. I can only see intake valves for now but will be removing exhaust too soon. )
(Second input is that i spun a crank bearing / journal but did not leave any pieces)
Additional info i did not remove oil filter it might of catched something ... still i would have silver river in my oil somewhere...
MODS
hindle 3/4 exhause
ECU flashed by reputable place
K/N air filter
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Post by willl84 on Sept 8, 2023 11:41:24 GMT -7
If it was bearings you would have seen that in the oil. The fact that the oil is clean is the strange part to this whole situation lol. Run it through a coffee filter and see if there's anything left in it. A bearing making that kind of noise would surely leave a trace in the oil.
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Post by RedAndBlack on Sept 9, 2023 11:42:13 GMT -7
Hope there's no malice in the combustion palace. You're on the right path for figuring it out. I can't think of anything else to recommend. Good luck and welcome to the forum! Let us know how it goes.
There have been some other reported engine failures on here. Maybe go through some of those threads And see if anything gives you any guidance.
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Post by mt10orc on Sept 10, 2023 8:46:56 GMT -7
Looks like you are working through each system to find the culprit. Keep us posted on what you find out.
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wot
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Registered: Aug 30, 2023 3:06:30 GMT -7
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Post by wot on Sept 16, 2023 9:05:12 GMT -7
So i removed the engine and opened up the oil pan to discover a boat load of copper shavings... that crank bearings. I need to split the case open and hope i did not spin a bearing in the case ! How do i add photos ?
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Post by mt10orc on Sept 16, 2023 21:37:21 GMT -7
So i removed the engine and opened up the oil pan to discover a boat load of copper shavings... thats crank bearings. I need to split the case open and hope i did not spin a bearing in the case ! How do i add photos ? Use desktop version and it has selection for add image. |
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wot
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Post by wot on Nov 26, 2023 20:14:46 GMT -7
So culprit of this disaster is one spun connecting rod bearing . The rod closest to the timing chain. A crankshaft had to be bought new because, the old one was out of round and it was pretty scored ... I do not know what happened in the life of this engine but im the one left with a blown engine to repair. Having all the goodies for rebuild coming in soon . Im currently standing on arround 3600$ of parts only right now. Luckly the oil filter did its job of stoping shit from getting to the rest of the engine.
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wot
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Posts: 8
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Registered: Aug 30, 2023 3:06:30 GMT -7
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Post by wot on Nov 26, 2023 20:17:16 GMT -7
Hope there's no malice in the combustion palace. You're on the right path for figuring it out. I can't think of anything else to recommend. Good luck and welcome to the forum! Let us know how it goes. There have been some other reported engine failures on here. Maybe go through some of those threads And see if anything gives you any guidance. Combustion palace is nice , when the connecting rod flew all the pieces kind of just bursted in the upper oil pan. |
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wot
New Member
Posts: 8
Likes: 5
Registered: Aug 30, 2023 3:06:30 GMT -7
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Post by wot on Nov 26, 2023 20:30:18 GMT -7
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Post by RedAndBlack on Nov 26, 2023 20:44:02 GMT -7
Man that sucksssss. Very much appreciate you sharing what you found.
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Post by willl84 on Nov 27, 2023 4:52:46 GMT -7
Ouch. 15k km isn't that much, especially for this kind of failure. Unfortunately the few that i've seen that had failures seemed to be under 15k miles or 24k kms. I'm at 13k miles (21k kms) on my 2019 now and it's been trouble-free so far.
Good candidate for an R1 engine swap?
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kyle
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Post by kyle on Nov 27, 2023 15:13:54 GMT -7
Wow. You did a great job at identifying the issue and going the full 10 yards to diagnose it everything. Thanks for posting pictures along with everything else.
It's cool that you had the technical know-how to do all that. I would have been stuck scratching my head for a while and probably would have just sold the bike for parts.
Best of luck on the rebuild! Keep us updated... I'm really excited to know how this turns out.
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wot
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Registered: Aug 30, 2023 3:06:30 GMT -7
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Post by wot on Dec 17, 2023 9:12:45 GMT -7
Ouch. 15k km isn't that much, especially for this kind of failure. Unfortunately the few that i've seen that had failures seemed to be under 15k miles or 24k kms. I'm at 13k miles (21k kms) on my 2019 now and it's been trouble-free so far. Good candidate for an R1 engine swap? Started the rebuilt on all journal bearing down in the base . Would be awsome for a R1 swap but i bought a MT for that torque ;p . Too much $$$ also lol but would of been cool tho! Im waiting for days off to finish up and get it back in the bike . Cant ride here theres snow now :,( |
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Post by willl84 on Dec 19, 2023 12:07:19 GMT -7
Ouch. 15k km isn't that much, especially for this kind of failure. Unfortunately the few that i've seen that had failures seemed to be under 15k miles or 24k kms. I'm at 13k miles (21k kms) on my 2019 now and it's been trouble-free so far. Good candidate for an R1 engine swap? Started the rebuilt on all journal bearing down in the base . Would be awsome for a R1 swap but i bought a MT for that torque ;p . Too much $$$ also lol but would of been cool tho! Im waiting for days off to finish up and get it back in the bike . Cant ride here theres snow now :,( R1 has the same torque but with like 40 extra HP lol. The MT makes peak TQ at 9k where the R1 makes it at 11,500. R1 is also 200HP @ 13,500 (for the 2019) compare to the 160 of the MT at 11,500. Those are also stock numbers with no flash, etc. No snow here yet but it's been too cold to ride. |
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darrin
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Post by darrin on Feb 28, 2024 11:06:49 GMT -7
Was at local dealership last weekend. Mechanic showed me a 2021 MT10 that had torn up bottom end of motor. it was set up for touring, only had 16,000 mi. He said its not the first time he's seen it happen. WtFnF?! Ive got a '20 with 11,000 mi. Little worried
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