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Post by gingel on Apr 14, 2015 14:01:52 GMT -5
I replaced the airfilter today and i noticed that inside the airbox where the rubber snorkel connects, there was something like maybe traces of oil, but it smells more like fuel. it wasn't a lot. I cleaned it. Is it related to the smell of fuel i sometimes smell from the exhaust when i'm standing with the scooter and the engine is idle? What do you think about the scooter fuel consumption? Here is a picture of where i found the oil traces (i marked it with red arrow):  |
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Post by urbanmadness on Apr 15, 2015 17:44:46 GMT -5
Are you overfilling the fuel tank when you get gas? If you overfill, the tank, and it get's into the emissions canister, it can end up in the air box.
You can get traces of oil in the air box on a worn engine (you said it was consuming oil before you rebuilt it, so it might be residue from before the rebuild. If you were getting a lot of blow by on the old motor, it would be oil that smells like gas). It may also be residue from break-in. Clean it up and see if that clears it.
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Post by gingel on Apr 17, 2015 13:32:29 GMT -5
Are you overfilling the fuel tank when you get gas? If you overfill, the tank, and it get's into the emissions canister, it can end up in the air box. You can get traces of oil in the air box on a worn engine (you said it was consuming oil before you rebuilt it, so it might be residue from before the rebuild. If you were getting a lot of blow by on the old motor, it would be oil that smells like gas). It may also be residue from break-in. Clean it up and see if that clears it. I do fill the fuel tank to the top. the fuel tank is small, only about 1.45 gallons. It could be that the traces of oil was from before the rebuild. i'll keep and check it. I finished doing the break in today (600 miles) , so i worked on the scooter today. I changed the engine oil, and also the gear oil. Rearding the gear oil, it was really dark color (almost black). I never had this kind of color with the gear oil. The only thing i can think that cause it, is that some of the new bearings still had some grease in them. That because some of the bearings came with side covers, and i removed them, but they had grease inside, and i cleaned as much as i can, but some grease was still inside them. Can a grease cause the gear oil to get a black color? I planned on replacing the fuel filter, and when i dissconnected one of the fuel lines, fuel started to flow out. This means the fuel petcock is not good. I started to drain the fuel to a bottle, and when the fuel level got to about a half of tank, suddenly the fuel petcock started to work again. What about that? Maybe too much fuel inside the tank can cause the petcock to stop working? Anyway, i'm going to order a new one, and mean while i will not fill more than half of tank. Do you think the bad fuel petcock is related to the fuel smell i sometimes get from the exhaust, when i'm standing with the scooter and the engine is idle? I also checked the valve clearence, and the intake was ok, but the exhaust valve was slightly too open, so i adjusted that. Thank you guys for helping. |
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Post by urbanmadness on Apr 17, 2015 14:54:38 GMT -5
a bad pet cock can cause a few problems. It could be sucking fuel thru a vacuum line. Change it, see what happens.
As for the black gear oil? I'd bet it's the grease...
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Post by gingel on Apr 18, 2015 5:17:57 GMT -5
I'll get a new fuel petcock.
Regarding the gear oil, i'll drain it again in another 600 miles. hopefully it will be cleaner.
Normally i change the gear oil only every 5000 miles.
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Post by gingel on Apr 18, 2015 10:32:21 GMT -5
I have a question about the timing chain.
During the rebuild i replaced the chain and also the tensioner.
Yesterday, when i checked the valves clearence i noticed that the chain have free play to the sides.
if i try to push it up and down, then it's not moving that much.
Is this normal? I don't remember how it was when i assembled the engine.
Here is a video i made:
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Post by lain on Apr 18, 2015 10:42:22 GMT -5
I have a question about the timing chain. During the rebuild i replaced the chain and also the tensioner. Yesterday, when i checked the valves clearence i noticed that the chain have free play to the sides. if i try to push it up and down, then it's not moving that much. Is this normal? I don't remember how it was when i assembled the engine. Here is a video i made: Looks like somethings wrong, bad tensioner or bad cam? Mine definitely doesn't do that. |
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Post by gingel on Apr 18, 2015 10:48:54 GMT -5
The chain almost don't move up/down, pretty tensioned.
What can this side free play do in long term?
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Post by lain on Apr 18, 2015 10:52:26 GMT -5
I am not sure, not from experience, but I think if there is that much play it could cause wear, plus why is it doing that in the first place one has to ask... Just get a new cam, they don't cost much, and you won't have to find out what happens when there is too much play by breaking down and needing a head rebuild which would cost a LOT more...
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Post by gingel on Apr 19, 2015 5:17:55 GMT -5
I think you were right about the tensioner.
I'm not sure if it's bad or not, but today i turned the tensioner about 1/4 of a turn counter clockwise,
and it made the chain to be more tensioned, and that free play stopped almost completely.
(you don't hear that "tic" sound from the chain like before in the other video i made).
This tensioner supposed to do it automatically, right? Or sometimes you need to "help" it?
Here is a new video:
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Post by urbanmadness on Apr 19, 2015 22:35:18 GMT -5
The cam is not the problem. Weak tendioner, maybe. I dont know if the side plsy is excesive or not. A little play is normal. Check the side play on your old stock chain.
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Post by gingel on Apr 20, 2015 3:27:32 GMT -5
Thank you, maybe i'll get a new tensioner.
but is it ok to manually adjust the tensioner?
What do you think about the second video? there is almost no side free play after i turned the
tensioner about 1/4 of a turn counter clockwise.
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