I had a Yamaha 650 Seca, 1982 for many years, with a Vetter Quicksilver fairing.
It was a great bike with shaft drive and Tubeless tires. Like the NT, it wasnt a big seller.
ridermagazine.com
But one thing it did have was shim over bucket valve lash. Yamaha sold a small cheep tool that would compress the bucket and it was child's play to take out the big shim and put in another. I think I changed one shim in all the years I had it.
I then assumed that most bikes (and cars) after this had shim under bucket for a fear that the shim would skip out of the top of the bucket during high rpms.
Fast forward to today.
On my Subaru Outback forum, we are discussing the new Gen 7 2026 Outback. One of which we have. One youtube tester said the car had shims. But there is no check interval in the owners manual for the 2.5 l. 4 cycl. Just like the Ford Eco-boast engines. Curious, I asked the forum about this. One guy said no one has reported any issues with the shims but produced a youtube vid of some guy replacing a shim on an early 21st century Subaru that obviously had shim over bucket valve lash. After much searching, it would appear that the 2025 crosstrek we have as well as the 2026 Outback have series FB25D (for direct injection) engines, that use a type of shim over bucket system, where the cam doesnt have to be removed.
Is this common in the automotive world?
People still seem to agree that some sort of intake valve cleaning isnt a bad idea from time to time with direct injection motors.
It was a great bike with shaft drive and Tubeless tires. Like the NT, it wasnt a big seller.
Retrospective: Yamaha XJ650RJ Seca 650: 1982 | Rider Magazine
Some people say that the Golden Era of Japanese motorcycles was in the early 1980s, when everything seemed to come together—engine, chassis and price. The
ridermagazine.com
I then assumed that most bikes (and cars) after this had shim under bucket for a fear that the shim would skip out of the top of the bucket during high rpms.
Fast forward to today.
On my Subaru Outback forum, we are discussing the new Gen 7 2026 Outback. One of which we have. One youtube tester said the car had shims. But there is no check interval in the owners manual for the 2.5 l. 4 cycl. Just like the Ford Eco-boast engines. Curious, I asked the forum about this. One guy said no one has reported any issues with the shims but produced a youtube vid of some guy replacing a shim on an early 21st century Subaru that obviously had shim over bucket valve lash. After much searching, it would appear that the 2025 crosstrek we have as well as the 2026 Outback have series FB25D (for direct injection) engines, that use a type of shim over bucket system, where the cam doesnt have to be removed.
Is this common in the automotive world?
People still seem to agree that some sort of intake valve cleaning isnt a bad idea from time to time with direct injection motors.