When Yamaha Almost Went Crazy

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- Credits -
“Honda NR500 test” by Honda Classic Italia

“The engine sound of NR500” by dearkoroberry

“Yamaha YZR 500” by 2strokelife

“Onboard the Yamaha 500 GP '86 World Champion with Lawson” by Niccolò Canepa

“YAMAHA YZR500” by MOTO CROQUIS

“YZR500 Dyno Run” by Moto2 Imports

“Classic TT 2017 - Anstey YZR500 compilation a treat for your ears” by anthony cubbon

“Suzuki Promo Tape of 1981 Daytona Superbike race” by Rider Files

“Yamaha FZR750 1987 Test Ride” by Old Gold Motorcycles

“1985 Yamaha FZ750 Genesis Walkaround & Test Ride” by Motorbikes 1980

“Yamaha TRX850 fly-by sound” by Extroverted Introvert

“Yamaha YZF R1 98” by Blast Brothers Official

“Yamaha OX99-11 start engine” by Davide Polo

“95 Ford Taurus SHO 7000 rpm” by fleetgt

“1993 Ford Taurus Sho V6 Yamaha 5 speed manual 0-70 mph run hear the sound!” by pushtoyota

[kosta]

Journo: How many valves does it have?
Yamaha engineer: Yes!

[magellanicspaceclouds]

7 valves seems unnecessarily complicated, but I give big props to Yamaha for doing such experiments.

[georgeg]

I had a 1985 Canadian FZX 750 (fazer) until 2001, with it’s milder cam than the FX 750 it had lots of torque, at one point I used it to tow a late 70’s Volvo 240 wagon about half a kilometre, my friend had a problem hear his home, with him pushing the driver side door and a 2 or 3 degree downwards slope to get started the bike was able to pull that 1.5 ton car back to his place on the first try without damaging the clutch.
At some other time I told some friends I was sure it could start in 6th gear with 2 on it with no problem, one of them started arguing that was impossible, ‘grab your helmet Jack’, 5 minutes later we were back at his place where he confirmed to his roommate and his brother that it went so well it was mind boggling.

[johncunningham]

Going beyond 5 valves has been demonstrated to increase Valve Shrouding in the Cylinder .
The 8 valve Honda NR series, was really an altered 32 vale V-8

[yeahoksure]

Yamaha is and will always be the greatest head designer

[_Y.J]

Gotta love 5 valve engines, they just hit different, a cross flow design would be a headache to design but it id reckon it would rev nicer

[jasyamaha]

Great video, thank you. I didn't know about the 7 value Yamaha's.

[heerajx]

It has been year's and still I am connected to this channel, love from India 🇮🇳🫶

[ELECTRICMOTOCROSSMACHINE]

Love the show, I raced a Yamaha 5 valve for years.

[upsidedowndog]

2 valves introduce swirl, 4 valves give the charge tumble. Any more than that and the fluid dynamics get wierd. Valentino Rossi prefered the 4 valve arrangement motogp engine which is why Yamaha stopped using 5 valves. Yamaha's brilliance in engineering is something I have always admired but as a mechanic it usually means more difficult repairs and Yamaha is notorious for not keeping stock of previous year models parts. I own all 3 other Japanese brand bikes due to parts availability. My 1st 4 bikes where Yamahas, I loved all of them!

[ElijahAngwin]

Yamaha has had their fingers in almost any form of performance engine built over the last 50 yrs. It’s crazy.

[jamiedean]

my fazer 1000 was a 20v engine, and without its exup it felt super gutless, but the power band was nice after 7k rpm. Sounded super smooth and happy to be up in that rev range. The head never failed on that bike with 70k miles, but their transmissions didn't live long to tell the tale.

[IlyushinSPA]

I had a TDM 900 and a FZS1000s, both of them with 5valves setups. Great bikes!

[rm]

Best educational engine channel on you tube.

[justinmiles]

Ive been aware of the 6 and 7 valve heads for a while. But Ive never seen pics of the ports for those heads. Im very interested in the port design for those heads.

[oldschool]

Damn i enjoy these videos

Thanks Visio racer

[Ramsi-Berlin]

Yamaha is so cool ❣️👌🏼
I Love Yamaha 😅
Love from Berlin 🇩🇪
Ramsi 🙋🏻‍♂️

[turbojoe]

did many a valve adjustment on the 5v Yamaha's. And a bunch of 4v Yamaha's. And a ton of 2v and 3v as well. Yes they had a 3v (50cc). I don't miss it but looks like I may get back into it again, 4 year break from working on Japanese stuff and the boss wants to buy a Yamaha dealership.

doing the valves on a Genesis takes patience, concentration, and a steady but methodic approach. Also requires some good organizational skills to keep up with shims and such. Ain't all that hard if you keep up with everything. Time consuming though!

[potato_jake]

1:34 was the saddest clip I have ever seen, had enough power for 2 more gears

[jujujunya]

Japan's technological capabilities
Petrol engines are beautiful.