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Post by gingel on Dec 7, 2016 14:42:13 GMT -5
Hi,
I noticed recently a rattle / knocking noise that seems to come from behind the cooling fan.
I can only hear it at idle. Once you accelerate it sounds ok, and runs smoothly.
I'm sure it's not the roller weights that rattle.
I read that some people had problems with the starter clutch, which caused a rattle noise.
Does the needle bearing inside the starter clutch can make that noise when it's failing?
What about the connecting rod bearing? If that's the cause, is it supposed to make rattle / knocking also when you accelerate?
Thank you.
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Post by gingel on Sept 26, 2016 8:31:42 GMT -5
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Post by gingel on Sept 25, 2016 8:53:59 GMT -5
Hi,
Just an update.
I replaced the entire front variator, and problem is solved. No metal noise.
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Post by gingel on Sept 24, 2016 9:12:33 GMT -5
Hi, I have a SYM 125cc scooter, and in the last few weeks it started to make noise that similar to metal knocking sound. The noise was sometimes louder, sometimes less louder, and sometimes even disappeared. I opened the variator cover to do a routine service (replace belt, slides, rollers weights), and i also cleaned everything. I did notice there is a free play between the Drive Boss Bush and the MOVABLE DRIVE FACE. (i attached a picture of the parts i mean). After i assembled everything and i started the scooter, that metal noise was even louder than before. I took apart everything from the variator, and i started the engine like that, and there was NO metal knocking noise. I uploaded to youtube 2 videos. One is with everything assembled in the variator, and you can hear the noise. Second video is when i ran the engine without the variator parts installed, and there is no noise. Do you think that metal noise can be caused by the free play between the Drive Boss Bush and the MOVABLE DRIVE FACE? Thank you.  |
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Post by gingel on Aug 20, 2016 7:54:13 GMT -5
so SYM is something special, or maybe the service manual that i have is wrong?
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Post by gingel on Aug 20, 2016 4:10:15 GMT -5
Hi,
I have a 125cc SYM scooter, and in the service manual it says that the torque for the Front wheel nut is 11-13 kgf-m (around 107-127 Nm).
That seems a lot, and i also ask a mechanic which said it's too much.
The mechanic said that 50 Nm ( around 5 kgf-m) is enough.
I dont know if it matter, but my scooter has a Front Drum brake.
What torque do you use for the Front wheel nut?
Thank you.
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Post by gingel on Feb 4, 2016 18:37:17 GMT -5
Thank you. I didn't notice it says to remove old gasket before using this silicone.
I'll try to move the engine shroud, and scrape that old gasket.
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Post by gingel on Feb 4, 2016 17:11:43 GMT -5
Thank you for the reply. Problem with the engine shroud in this scooter, that it is opening to the sides and not to top and bottom. I don't see a way to remove the engine shroud without removing the engine, but i could be wrong. I have a silicone of a company called victor reinz, REINZOSIL. www.reinz-industrial.com/EN/PRODUCTS/Sealing-Compounds/REINZOSIL.aspx I thought maybe put a thin layer of that. Do you think this silicone will be good? Thanks. |
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Post by gingel on Feb 4, 2016 10:57:30 GMT -5
Hi,
My Scooter is a SYM 125cc.
I'm going to replace my Intake manifold, and i also have a new Intake manifold gasket (paper gasket).
A while ago when i took out the Intake manifold, i noticed that some of the manifold paper gasket got stuck to the
plastic spacer. The paper gasket is still complete on the engine head but maybe the thickness is not like a new one.
Removing the old paper gakset is almost impossible now with the engine shroud over the engine head, and also
the gasket is really stuck on the head.
I'm afraid to try and scraping it, as something may fall inside the head, or that i will not be able to scrape all of it.
Can i just put the new Paper gasket over the old gasket?
Will i have an air leak?
Thank you.
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Post by gingel on Feb 1, 2016 20:08:30 GMT -5
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Post by gingel on Sept 1, 2015 18:05:31 GMT -5
I was hoping maybe someone have one of these O-ring and can measure it,
or maybe already replaced it in the past and remember the size.
I prefer not to take off the starter motor before i know i can buy this kind of O-ring here.
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Post by gingel on Sept 1, 2015 17:34:21 GMT -5
Hi,
I have a SYM 125cc scooter, and i see i have a very small leak.
I think it's more like oil vapors that are accumulated on top of the starter.
Probably a bad O-ring on the starter. i would like to try and replace that O-ring.
Anyone have a clue on the size of this O-ring?
I would like to buy it before i take the starter off the engine.
Thank you.
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Post by gingel on Jun 3, 2015 16:18:29 GMT -5
It isn't a chinese scooter, but i think the engine is the same design as a GY6, not?
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Post by gingel on Jun 3, 2015 14:10:17 GMT -5
It's a SYM brand, from taiwan. Yes, i know it's done a lot of miles. I never expected it to last that long. See my post from almost 2 years ago, when i crossed the 100K km mark (62k miles). I did the rebuild when it reached to around 72K miles. So i checked the oil today again, and when engine was cold the dipstick showed almost full. After that i rode it to where i needed, and then after about 10 minutes i checked the oil level and it was exactly full on the dipstick. So i guess it's not missing oil. if i would add more oil it will show too much oil when engine is hot. I'll keep watching it. strange oil. maybe i'll try a different brand next time. |
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Post by gingel on Jun 3, 2015 5:57:55 GMT -5
Ok, so today i checked the oil level and it was almost at half when engine cold, and slightly higher when engine is hot. So strange why sometimes it showed a much higher level when engine is hot. My next thought is why the oil level is lower. It's been around 800 miles since i changed the oil. The cylinder and piston + rings are all new. also the valves are new and valves seals. No oil leaks as i can see. I checked the airfilter housing and no oil from blow by. Btw, the oil didn't get a black color yet. I still didn't add more oil. left it like that for now. Can it still be that the rings are not fully seated after more than 1200 miles? I did ride it a few times with WOT (after the engine break in). Running it at WOT can cause the engine consume oil on high RPM's? Before the rebuild i had to add almost a quart of oil every 600 miles. so it's not like that now, but still, i thought it will not have a loss of oil at all. This is a picture of the plug. looks ok for my opinion.  Hopefully I misunderstood your comment. After your rebuild you SHOULD have changed the oil after, say, 50 or 100 miles ..... then again after 300 miles .... and thereafter every 500 or 1000 miles. It sounds like you just rebuilt, added oil and then rode. During breaking - especially in the first 50 miles - a lot of metal comes off the rings. Most get caught in the screen 'filter", but no where near enough. So if you never drained and cleaned the screen you are running with a ton of abrasive material floating around. Hope i just didn't understand. ps: check oil with the dipstick NOT (NOT) screwed in. Just find a flat spot, put on center stand (important), unscrew the dipstick, place it back in (without screwing), pull out and check. Check with engine stone cold - oil half way on the cross checked area is good. pps: plug looks fine, so there is no oil blowing past the rings. I changed the oil after a little less than 600 miles after the rebuild. When the scooter was new, i also rode it for a little less than 600 miles before changing the oil. This was done by the dealer here when it was new. And there was no problem. I also was changing the oil only every 2500 miles. dealer orders. and the scooter made over 62,000 miles like that. Every one here change the oil like that with these scooters. When i changed the oil after the rebuild, the screen filter was pretty clean. Maybe the SYM parts are more precise. Here the dealers also telling you to use a semi synthetic oil, which is basically mineral oil with additives. So if it's not blowing the oil past the rings, it means that it's not burning it? Where the oil went? it's not a lot of oil that is missing but still, it didn't just disappear. Do you think it will remain at half of the dipstick or will continue to drop? I now at 800 miles since the last oil change, so i still have 1700 miles to go until i'll reach 2500 miles. Thank you. |
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