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Post by gingel on Dec 29, 2014 16:16:46 GMT -5
OK, thank you.  |
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Post by gingel on Dec 29, 2014 15:32:24 GMT -5
so i noticed something on the left case. you can see in the picture where i marked it with red circle. I think it got damaged from a tool been dropped on that accidentally, or it was there. don't know.   Anyhow, it's looks like the gasket is going under it, and when you look at the picture of the right case, it doesn't seems that point is meeting the other side with the same round shape. (see picture of the right case).  Do you think it's critical, or it's ok? |
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Post by gingel on Dec 28, 2014 16:45:50 GMT -5
Hi, Thank you for the quick answer. i'll try with the wd-40 before using the oil seal remover tool. dmartin95, i will try and post updates, and i'm sure i will have more questions. :-) And here is another question: I noitced that SYM are using a different way (at least on that engine) to operate the oil pump. Instead of a chain, there is a plastic gear which connect to a small gear on the bottom of the clutch starter. Also, the Woodruff Key seems to be metal, and it looks like it's part of the crankshaft. Ever seen that? Here is a picture:  |
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Post by gingel on Dec 28, 2014 15:20:59 GMT -5
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Post by gingel on Dec 27, 2014 8:44:21 GMT -5
Hi,
Thank you all for the answers.
it wasn't full of oil, but it felt like it's oily at the bottom. could be just dirt.
In the picture, where the bottom bolt, it's looks like grease, maybe because i used some WD-40 on the bolt,
before trying to open it.
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Post by gingel on Dec 26, 2014 13:47:10 GMT -5
Hello, I finally started to work on rebuild my scooter engine, and today i took out the engine from the frame. I also took out the rear shock absorber, and i have a question. You can see in the picture where i marked it with the red arrow, there is some kind of a rubber gasket, and i think it's not supposed to be there. i think it was disconnected from the top. There was also some oil at the bottom of the shock absorber, and the bushing inside the case needs to be replaced. What do you think about this rubber gasket, was it disconnected from where it supposed to be? Is this shock absorber needs to be replaced? Thank you.  |
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Post by gingel on Jun 7, 2014 22:38:12 GMT -5
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Post by gingel on Jun 6, 2014 0:00:57 GMT -5
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Post by gingel on Jun 4, 2014 6:47:03 GMT -5
Wow,, I cant believe he got 68K miles out of it,,SYM is good but not that good...lol I also was surprised it did so much miles, and it's still running. Just need to make sure there is enough oil inside. |
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Post by gingel on Jun 4, 2014 6:44:53 GMT -5
It should be a pressed crank so replacing the rod bearing would require a machine shop to break it apart, replace the bearing and press it back together again then you would still have the potential that the piston end of the rod may not be up to spec. You may be better off checking if a company like Hoca makes a replacement crank and rod set which should also come with the new bearings already on it for less than $200 US and it will be all nice and clean too. Ebay UK has a good number of low mileage used SYM 125 engines starting at 100 British Pounds and new ones for about 400. www.ebay.co.uk/bhp/sym-125-engineI'll check the cost of a replacment crank and rod. Buying a complete engine from over seas, is not an option for me, because where i live they are giving you hard time when you personally import an engine. The ministry of transportation want all kinds of certifications, plus the shipping cost (if any of the sellers will even want to ship to Israel) will be very high. I'll better buy the parts, and rebuild my own engine. Anyway, my scooter model name is "Duke classic 125", and i understand it has the same engine as the "Megalo 125" . |
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Post by gingel on Jun 2, 2014 22:33:33 GMT -5
Getting a new crank will cost too much as this is a SYM part.
Is it possible to just replace the crank bearings and the rod bearing?
Do you need to rebalance the crank after that?
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Post by gingel on May 31, 2014 15:43:41 GMT -5
But how do you reconnect the new chain? Do you use the same rivet you took out, or do you need a special "master link" ?
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Post by gingel on May 30, 2014 12:35:48 GMT -5
Anyone knows regarding the timing chain?
Can it be replaced without splitting the engine case?
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Post by gingel on May 29, 2014 8:54:56 GMT -5
buying a new engine will not be cheaper.
It's a SYM motor, and also where i live there isn't an option to buy a new engine.
Maybe i can find a used one, but i prefer to rebuild mine.
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Post by gingel on May 28, 2014 14:34:08 GMT -5
Hello,
I don't know if you remember, but almost a year ago my scooter hit the 100K KM mark.
It's now consuming more oil , around half of quart for 1000km (620 miles).
I am now at 110,000 KM (around 68,000 miles), and i think it's time to rebuild it.
The scooter is made by SYM.
I decided that i will replace the piston, piston pin, rings.
I will also rebuild the head completely, which means new valves, springs, valve seals and guides.
I never rebuild a scooter engine, it will be the first time for me.
That's why i can't decide if to open the engine completly and also replace the crank bearings (is it possible),
and also replace the timing chain.
How many miles can the crank bearings do, considering that the engine was taken good care?
What about the timing chain? how many miles can it lasts?
Regarding the timing chain, is it possible to replace it without splitting the engine?
Is it possible to use a chain breaker and riveting tool to replace that chain?
Anyone knows what is the size of the timing chain, and especially the rivet size?
Thank you for any help and advice.
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