Gears don't change when down idling By motley (Read 641 times)

[motley]

I thought this was variator related and didn't think much about it, until I replaced the variator with a new spare. But whenever I'm going > 5k and start slowing down theres this grung like effect going on. The only way to fix it is to either hold in the brake while giving it gas and wait for the engine to go into the right gearing. 

I haven't tested with the cvt cover off yet "Removed the center stand due to a nasty squeak". So testing isn't as easy.

I've noticed a semi loss in power since this has happened. I've done some testing while riding and letting off the throttle and getting back on it "imaginary shifting" the bike starts to pick up the right speeds that it did before hand. So I'm pretty sure this is gearing related. 

Not sure if this is tire related or related to my issue, but whenever I'm under throttle theres a vibration going on in the floorboard with a rhythm that never changes. But only when under throttle. It almost reminds me of knobby tires..

So I'll be toping off the gear oil today before work, and test the cvt area tomorrow. If anyone has any suggestions that would be great.

I'm trying to get my car on the road "Get it inspected, and pass my license: so it would be nice to keep the bike ridable until at least then. 

Kuddos on any help

[motley]

The rollers or whatever is going on has gotten worse. Not sure what it is but now after a quick test at 10k rpms I'll go 30 mph. The vibration pulse has gotten much worse. I'm looking into doing a clutch rebuild, maybe 3K engagement instead of the current 5k, I'd prefer 2k but that's to close to idle rpms.

I'm not sure as to what to look into, but I was considering on taking apart the rear area where gear oil goes and replacing those gears if the rebuilding the cvt area doesn't do the job. Whatever it is it's related to the motor as coasting on the bike is fine "no vibrating pulse"

[cyborg]

There's a few sliding areas that would be my first choice to be looking at,,,either the variator or the sheave in back is not sliding in and out as designed,,could be bothe,,,I think a disassembly clean and lightly grease lube the boss and shafts would do the trick

[motley]

Sorry for the late reply, work has been a little crazy lately, But I did do what you said ^ cyborg .

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I couldn't seem to find the problem after doing that, I did a full inspection of all of the moving parts, checked for bad wear, still nothing until I finally got mad and went for a long hard run attempting to break something.

That was the best option. So the problem is, the rear variator plate that the rollers and sliders push out with enough centrifugal force. That piece will lock onto the shaft for the variator "crank shaft or whatever it's called >.<". It's almost like the hole in the plate got way to small. But it did require slow safe prying all the way around it just to get it off, it was so tight I could crank the motor just by spinning it with my fingers.

My only thought is when I was checking for the culprit of the slow speeds/vibrating rhythm on the floorboard, I managed to mix a one 6g/8g roller with my 10g setup causing the variator to not entend perfectly horizontal.

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As for the vibration, and low speeds, the lock tight broke loose somehow on the carb for the throttle adjustment. Full throttle was half throttle. So I was operating in a crappy range the entire time which is typically my build up speed area for rpm limiting since I live in the middle of no where "Long trips with no stop signs".

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I have parts on the way for a new variator, ordered some sliders as well. The offset of the rollers should of been the culprit for the rear plate locking the way it did right?
Thanks for the reply

[cyborg]

Yep there's the problem