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Post by rockynv on Dec 16, 2016 12:33:13 GMT -5
The 250 Honda Helix and its clones don't have a bearing support in the outer case either. I'm guessing that Piaggio does. I'm still guessing that his problem is in either the CVT, like one of the replaceable guides has fractured and fallen out or his belt has stretched and is rattling the CVT. The GY6 is a fairly sturdy unit with no clutch bearing failures in my memory although it can happen, I guess. Interesting that the video is of another Thailand built Honda. Ungubunga just had the same thing happen on his PCX. Most don't realize they have had bearing failures until its too late and usually have junked the bikes due to the repetative failures of the muffler, header pipe, clutch shoes, etc. I have seen this quite a number of times and to me it is the biggest flaw in the GY6 design. It is one of the first things I check when someone complains of mufflers or exhaust flanges constantly coming loose or cracking. |
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Post by w650 on Dec 16, 2016 12:38:32 GMT -5
I would still look at the CVT guide bushings if the problem is only under load. A bad bearing usually makes noise regardless of load as evidenced by the Honda bearing video.
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Post by rockynv on Dec 16, 2016 12:54:41 GMT -5
Wow! That has to be the most destruction I've ever seen in a broken CVT. Including years on China scooter forums. Imagine the pain of owning something that expensive and having it blow like that. I love the CVT cover removal. I thought my GY6 with its bunch of bolts was bad, that tops it. My CN-250 comes off with just two bolts in seconds. Looks like he damaged things with a cheap aftermarket kevlar belt and tried to put it all back together without replacing everything that the aftermarket belt had damaged. You will see those bikes getting handed down to the next generation if they are maintained by the book. Those Athena belts caused a lot of problems for way too many people. The CVT cover actually comes off very easily if you do not fight with it and really does not need to come off for around 6,200 to 12,500 miles as long as you buy fresh OEM belts and keep the CVT filter clean. At 50,000 to 75,000 miles you change the variator and clutch. Mine has 30,000 miles on it being ridden rain or shine here in Tampa Bay Florida and there is not any rust on the crank while the bike in the video with the blown variator is so rusty it looks like it was left submerged or potentially ridden in salt water. |
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Post by mrsunsett on Dec 17, 2016 1:30:33 GMT -5
For continued diagnosis, heres whats up.
A. The bike makes no noise with it up on the center stand with no load, it only makes the noise when i gun it from a standstill or moving at 20 mph or lower and i gun it.
B. I only feel it a tiny bit, its mostly all noise.
C. I held the rear break down as hard as i could and slammed the throttle and nothing happened, then i slowly increased the throttle with the break on from idle to full throttle, no noise.
I am super appreciative or all the help guys, i am in atlanta for a few days so when i get back im really gonna get into it. Cant wait to find out what the issue is with it.
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Post by dollartwentyfive on Dec 17, 2016 10:12:24 GMT -5
the clutch on my ride (244cc) can't easily be serviced without dismantling it.
my idea was to purchase a new clutch, then dismantle and service the old one.
the primary difficulty are the clutch pads, these MUST be kept grease free.
you can't just start shooting grease into every hole you see.
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Post by rockynv on Dec 17, 2016 11:49:53 GMT -5
For continued diagnosis, heres whats up. A. The bike makes no noise with it up on the center stand with no load, it only makes the noise when i gun it from a standstill or moving at 20 mph or lower and i gun it. B. I only feel it a tiny bit, its mostly all noise. C. I held the rear break down as hard as i could and slammed the throttle and nothing happened, then i slowly increased the throttle with the break on from idle to full throttle, no noise. I am super appreciative or all the help guys, i am in atlanta for a few days so when i get back im really gonna get into it. Cant wait to find out what the issue is with it. C tends to indicate that the variator and belt are not the problem here but.... When you get back it will be time to put on your Detectives Cap and do the forensics while taking it apart to get to the root cause. |
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Post by mrsunsett on Dec 22, 2016 9:17:40 GMT -5
Development: which may be bad..... so i got home deom atlanta to the heat and mosquitoes in hollywood fl... so i took off the cover of the belt... no markings on the case from a loose belt... very VERY LITTLE wear on the belt... and when i mean little wear i mean from the small amout of miles on the bike. Just under 1000 miles.
Heres where is scary, maybe its cauee it hasent been ridden in a few days. But i took it out for a ride to further isolate the sound and feeling that i was telling yall about..
NOTHING! no noise, no weird clacking. Nothing... even if i slammed the throttle WOT from a stop ... ill investigate further and stress test it?
My opinion..i think its a problem that reared its head in the clutch assembly or MAYBE the variator crying out in warning... and it just stopped after not being run in 5 days.. if it comes back ill video and record and share with yall.
Runs like a dream.. but that hiccup is sacry for me cause now i cant even continue to investigate the problem.. and if i take it to my buddie whos a chinese scooter guru hes gon a look at me like im hearing LOL.
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Post by rockynv on Dec 22, 2016 23:48:02 GMT -5
Possibly the clutch or variator was sticking from lack of use and your more aggressive riding finally loosened it up. If it had never been run at high speeds you may have had the variator or clutch hanging up from time to time as you pushed it past the working range it had been ridden at by your wife so the lubricant is now spread more evenly on the variator boss and clutch spindle. Be sure to check the CVT filter regularly and keep it clean.
Maybe you need to ride it every now and then to ensure the CVT and Clutch Drive Faces get worked through their full range of motion so that they stay working freely.
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