lupo76
Scoot Enthusiast
Posts: 157
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Post by lupo76 on Apr 3, 2019 0:57:23 GMT -5
Good morning community.
I´m struggling with my latest project, which is a SYM Flash 50 from 1997. Awesome and super light scoot. Stock 5,4HP!
Now I need to find out the amount of fork oil for that little baby, I checked everywhere and did not find anything..
Someone may has an idea?
Cheers
Nils
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Post by 90GTVert on Apr 3, 2019 6:05:53 GMT -5
Not sure what the spec is for that scoot, but you can measure the volume or height when you take them apart. May not be to spec, but may give you an idea. If you just want to know so you can buy some for a service, pick up a qt/L and you'll have more than enough. www.youtube.com/watch?v=yWrSLBBWEjw |
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lupo76
Scoot Enthusiast
Posts: 157
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Post by lupo76 on Apr 3, 2019 9:13:25 GMT -5
Not sure what the spec is for that scoot, but you can measure the volume or height when you take them apart. May not be to spec, but may give you an idea. If you just want to know so you can buy some for a service, pick up a qt/L and you'll have more than enough. www.youtube.com/watch?v=yWrSLBBWEjwI`ve already been so far. But 25ml in the left and none in the right tube does not give you any idea, unfortunately  Looks like I have to try many times... I´ll start with an oil level 100mm from top. And then try. |
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Post by 90GTVert on Apr 3, 2019 10:06:04 GMT -5
Seems like a decent starting point. You could fill one to that height and then check the volume so you've got all of the data. Then you could adjust with volume or height more easily as needed. Even if you wanted to adjust height after it was all together because it was softer or stiffer than you think it should be, you could probably calculate the volume needed to change the height based on the ID of the stanchion tube and then just pour in or draw that amount out with a syringe instead of taking it all apart to be able to get an accurate measurement. Could even test on the bench to be sure you were correct or get those numbers solely by testing. Be sure to make a note somewhere that you won't lose it once you figure it out so you don't have to worry about it if you ever change it, and maybe update the thread in case someone else finds the info later.
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Post by 190mech on Apr 3, 2019 16:55:42 GMT -5
If its an old school damper rod style fork,the common start was about 25mm above the top of the damper rod,full extension,no spring..That way the rod is always in oil...then adjust from there..
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Post by ThaiGyro on Apr 3, 2019 22:48:05 GMT -5
Yes, what 190mech says...and a word of caution. I am no scoot expert, but have owned a crazy amount of motorcycles...cars...trucks. I have had a few older and one newer damper-rod fork setup that do NOT have the same internals on both sides. Maybe not important on yours, but worth a good look. My Showa 43mm forks on my current fun dual sport Honda, have a spring in one side and the damper rod in the other, so the oil level is not the same. Not sure how uncommon that is. The other thing that helped me was installing tube vent caps in both legs. That way I can have a bit of adjustment using the internal air compression to give me some "feel". Also useful when trucking the scoot/bike to avoid blowing seals if you compress the forks. (I don't) Ohlin's makes them for my bike:
Zeta Racing has some:
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lupo76
Scoot Enthusiast
Posts: 157
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Post by lupo76 on Apr 4, 2019 1:18:46 GMT -5
If its an old school damper rod style fork,the common start was about 25mm above the top of the damper rod,full extension,no spring..That way the rod is always in oil...then adjust from there.. Dunno What you mean mate, please explain. How can the level be ABOVE the damper?? I think I do not understand, also my english is not the best Its a normal telescope fork, nothing fancy. SYM still uses the same forks in newer models, like the MIo 50 and even in actual 10" models. For these small forks the level is around 100-110mm air cushion. But for no scooter I found any advice for oil level. Not even i the repait manuals for shops. |
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Post by 190mech on Apr 4, 2019 4:24:24 GMT -5
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lupo76
Scoot Enthusiast
Posts: 157
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Post by lupo76 on Apr 4, 2019 7:29:17 GMT -5
Ahhh, now I see. Sorry  Thank you for explanation. |
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Post by ThaiGyro on Apr 4, 2019 7:32:46 GMT -5
Some newer models give a fork level as opposed to a volume of oil. This can be more efficient if you know the numbers. Dave Moss tuning in the UK has some good videos/info. This one has some of his thoughts...worth noting. Doesn't completely answer your issue. www.youtube.com/watch?v=_k_JvZ4IdfcIf the link doesn't work it's www.DaveMossTuning.com or find his You tube stuff. Practical. |
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Post by SMALL CC TEK on Apr 4, 2019 17:14:13 GMT -5
Kymco made a scooter called a Filly lx 50 , looks like the same fork tubes on your SYM The Kymco takes 38 +1 cc # SS-8 oil
O yeah how much did you drain out of them?
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lupo76
Scoot Enthusiast
Posts: 157
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Post by lupo76 on Apr 5, 2019 1:28:54 GMT -5
Looks like I have to try many times... I´ll start with an oil level 100mm from top. And then try.
@smallcc Left I drained about 25ml, and right was empty. |
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Post by ThaiGyro on Apr 5, 2019 4:44:40 GMT -5
Hmmm , curios no? Does the right look like it EVER had oil? The video link I posted, gives a data point worth shooting for...no matter the oil level, you are trying to find a nice point in "damping". If you can easily bottom the fork tube, while pushing...maybe too soft. If you can just get to the bottom, but barely? You are close.
That does not take into account you own muscle madness or light structure. Try that with a variety of friends. Haha...sound like a fork you party!
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lupo76
Scoot Enthusiast
Posts: 157
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Post by lupo76 on Apr 5, 2019 6:53:37 GMT -5
Yes, both forks had oil in it, at least the right side had residual oil in it.
Weekend I will test, I´ll let you know
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