Transmission failure - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 38 (permalink) Old 04-05-2017, 01:52 PM Thread Starter
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Transmission failure

Had an interesting experience recently on my 2016 FJR with about 7300 miles.

I rode to lunch with some friends on Saturday, March 25. After lunch, we got back on the bikes and headed out. Came to a red light, it turned green and we pulled away. I'm riding with cruisers and was the second bike. Pulling away was nothing dramatic or "spirited". The bike made a funny bang, lost power, and started knocking. Got it pulled over to a safe place in about 100 yards. It would run, but the lack of power and knocking continued. I had it towed to the shop and went by to visit with them yesterday.

The manager came out and asked me to join him in the shop. They had disassembled the engine that morning and had it on a bench. He showed me the inside. It looked like a grenade went off in there. There was shrapnel everywhere. There was a hole in the wall separating the transmission from the crank-chamber, the crank shaft was chewed up, one con-rod was broken, and the underside of the piston was chewed up.

They suspect that one of the gears disintegrated, drove through the side of the case, and broke the con-rod before bouncing around and chewing up everything else.

Yamaha has asked him for photos and a parts list. He suspects, when they see the extend of the damage, they may just send him a crate motor to replace the whole thing.

So...now a question. Anyone else experience anything similar with this wonderful new six-speed transmission?
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post #2 of 38 (permalink) Old 04-05-2017, 03:15 PM
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Had an interesting experience recently on my 2016 FJR with about 7300 miles.

I rode to lunch with some friends on Saturday, March 25. After lunch, we got back on the bikes and headed out. Came to a red light, it turned green and we pulled away. I'm riding with cruisers and was the second bike. Pulling away was nothing dramatic or "spirited". The bike made a funny bang, lost power, and started knocking. Got it pulled over to a safe place in about 100 yards. It would run, but the lack of power and knocking continued. I had it towed to the shop and went by to visit with them yesterday.

The manager came out and asked me to join him in the shop. They had disassembled the engine that morning and had it on a bench. He showed me the inside. It looked like a grenade went off in there. There was shrapnel everywhere. There was a hole in the wall separating the transmission from the crank-chamber, the crank shaft was chewed up, one con-rod was broken, and the underside of the piston was chewed up.

They suspect that one of the gears disintegrated, drove through the side of the case, and broke the con-rod before bouncing around and chewing up everything else.

Yamaha has asked him for photos and a parts list. He suspects, when they see the extend of the damage, they may just send him a crate motor to replace the whole thing.

So...now a question. Anyone else experience anything similar with this wonderful new six-speed transmission?
Sounds like a poorly manufactured gear of a bad defect in the metal on a gear. Hopefully, that would be a one-off type situation. Seems like we would have heard if there was anyone else with this problem.
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post #3 of 38 (permalink) Old 04-05-2017, 03:28 PM
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Sounds EXACTLY like what happened to my '06 Yamaha R1LE in turn one at Barber Motorsports. It was not a transmission issue. It was a snapped connecting rod, which was a known issue with that particular motor. The crank end then proceeded to jackhammer the bottom of the motor off and broke into the transmission case.

Mine would have 'looked and felt' like a transmission failure, since it was off throttle when it happened, but it was most certainly a rod failure.

Knowing that the FJR's gearbox is just like a jumbo sized R1 box, I don't see how it would be the tranny's fault. And (going way out on a speculative limb) since this is NOT common for an FJR, I would suspect a defective assemble resulting in a thrown rod. I suspect you got a one-in-a-million failure, and Yamaha will make good on it.

I'm glad it didn't result in a crash, and hopefully the issue will be resolved for you.

* * Just hanging around until I can ride with Rock and Mack again. Never forgotten. * *
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post #4 of 38 (permalink) Old 04-05-2017, 04:00 PM
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Never heard of that before, probably a faulty part

Past bikes; Honda 50 Suzuki 50 Yam XS250 Yam XJ650 Yam XJ 900 Honda CX650 Turbo Yam FJ1100 Yam FJ1200 (2) Honda ST1100 (2) Yam FJR1300 (5) 670,000 miles !
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post #5 of 38 (permalink) Old 04-05-2017, 04:27 PM
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Yup. Con rod broke first. Then broke everything else.
If a mechanic at a shop told me a gear broke the rod I would take the bike somewhere else.
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post #6 of 38 (permalink) Old 04-05-2017, 07:57 PM
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Agree with mobilemike and Liquidsliver, caused by connecting rod breaking first.
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post #7 of 38 (permalink) Old 04-05-2017, 08:19 PM
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Agree with mobilemike and Liquidsliver, caused by connecting rod breaking first.
Concur!

With the sole caveat that I haven't examined the engine, it is far more likely that the conrod went first.

Steve

2005 Yamaha FJR1300A
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post #8 of 38 (permalink) Old 04-05-2017, 08:22 PM
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Back in 1977 my friend's father bought him a brand new Yamaha RD200DX. Sharp looking little bike, and to us it was a beast. We were 17.

500 miles later it threw a rod right through the crankcase.

My 1958 BSA Bantam D7 rolled right on by .... slowly, as was its wont!

Steve

2005 Yamaha FJR1300A
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post #9 of 38 (permalink) Old 04-05-2017, 09:05 PM
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Wow, sorry to hear about the trouble, sure hope it's not contagious.

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post #10 of 38 (permalink) Old 04-05-2017, 10:44 PM
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Back to the original subject.
That sure sucks your new bike threw a rod. I hope Yamaha acts quickly and gets the dealer a new complete engine pronto.
Good for you to not crash the think when it blew. It could have locked up the rear wheel and/or oiled down the rear tire. That would have been bad.

BTW PICS????????????????
Us old mechanics love to see carnage. Did the rod break at the big or small end. Or in the middle.
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