Bikes with hydraulic valves...?

[picos mestizo]

My 'outdated' Enfield efi 2008 plate has hydraulic valves, mind you it only revs past about 4000 rpm when I miss a gear and even then not sure as no rev counter

Dream on, were talking inlet & exhaust valve clearance hydraulic adjusters here!

[The Sarge]

My guess is cost, it must be cheaper to use shims or the older ( and in my opinion better ) adjustable tappets ?.

Sarge

[mikeyboy]

I would suggest space,modern bike engines seem to be getting smaller,
Added to that 99% bikes don't do big miles so why add cost /complexity (thumbs)

[mikeyboy]

so Honda did it why they change then....most dual sports or adventure whatever arent high reving...

frequent service intervals are a ball ache too...most modern cars,lorries run similar oils and have double the mileage between services....oils changed to allow this but bikes did not..

ktm need high spec oils at high cost ....surely they dont need it and all the maintenance required is crazy...you dont see sports cars in the garage every 6 mnths for a overhaul.. :woohoo:

Cars,trucks etc do not share the engine oil with gearbox lubrication,the shearing action of the gears On the oil degrades it a lot quicker,also cars/ trucks have a larger oil capacity

[Crossrutted]

ktm need high spec oils at high cost ....surely they dont need it and all the maintenance required is crazy...you dont see sports cars in the garage every 6 mnths for a overhaul.. :woohoo:

KTM service intervals are generally based on racing conditions - ie prolonged periods at high rpms/loads.

Real life isn't like that for most of us.......

[GB]

HD sportster has hydraulic lifters.

What does it rev too

7000 if you are lucky, what does a diesel car Rev to?

[BokitoJos]

Shim technology improved up to 60000mls interval depending on brand and type.

[picos mestizo]

Shim technology improved up to 60000mls interval depending on brand and type.

This improvement is also due to valve head / valve seat recession & general cam lobe / valve tip wear.

[Mawnanian]

All air cooled Harleys have had hydraulic valve lifters for decades but they're a pushrod relatively low revving engine, 6000 for the big twins and 7000 for the sportsters. It means they're a piece of cake to maintain and service.
It must be to do with the high engine speeds and the layout of the DOHC engines.

[Tramp]

Yep ....fogot about shearing in gearbox lol...i change gearbox oil every 3 years with good quality teflon stuff...

Diesels rev to about 3.5k to 4k...most power dependingbon turbo is at 2.5k...love them.

My old transalp did 60k without any ajustment and didnt need any either...dr is same.