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General Discussion / Re: New 2022 Kymco AK 550
« on: November 13, 2021, 07:00:45 PM »
No, there is definitely a clutch that is after any CVT in a scooter drive train. Even little 50 cc scooters have a clutch between the CVT and final drive gears at the rear wheel. However in the swing arm mounted engines with the CVT along the swing arm the clutch is a dry clutch. But in every scooter with a frame mounted engine that I've looked into the clutch is a wet clutch that shares the engine oil.
There is no clutch LEVER since the clutch is automatic. But there is a clutch. I HAVE been reading my service manual for the AK and there is an entire section just on the clutch and reduction gear set that is between the CVT and final drive/timing belt. And I have read the service manual for my wife's Metropolitan and my Burgman as well as worked on those. THERE IS A CLUTCH. The CVT is in place of a fixed gear transmission, but it does not replace the clutch. Basic vehicle drive train mechanics. Almost the only vehicle that may not have a clutch is an electric drive vehicle. But even then, if there is a gas motor, such as with a hybrid, there is a clutch in those as well.
And just to add to complexity any bike with DCT has TWO clutches! And those are usually wet clutches.
If you have a swing arm mounted CVT and clutch you don't have to be concerned with what oil goes into the engine... other than recommended viscosity and oil serviceability rating. But if the clutch is mounted as part of the engine casing, as in the AK 550, then you do.
BTW- whats "ma Orr"? typo? Oh, you were referring to JASO MA/MA2... and there definitely is mention of JASO in the owner manual. Been working with and seeing those specs on oil for over the last 15 years.
Feel free to upload a picture of the manual page asking/stating you need a MA(2) oil for the engine.
And no the AK550 nor does almost any other CVT have a wet clutch or require MA(2) type oil. This isn't even a question. Hell even some Harley's doesn't don't even require a MA(2) engine oil. As they have a separated systems/housing for they're wet clutch and engines.
I love how people throw around how many years they've been doing X. Like that matters, let the facts speak for themselves and not your perspective on life.
MA(2) oils are all about the lack of friction modifiers for your clutch. To much slippage and things won't engage. But in a CVT just like that's in the AK550, there is no gearing clutch or wet clutch.