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Messages - yatezy9

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Technical | How To / Re: Quick electrical Question: How many milliamps?
« on: December 24, 2012, 05:12:43 AM »
I read in another forum that if ur over 35mA something is leaking so thought i should check, especially since im uncertain of the instrument panel gauge.
But sounds like its all good.

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Technical | How To / Re: Quick electrical Question: How many milliamps?
« on: December 22, 2012, 11:27:42 PM »
I checked the resistance on the fuel tank sender unit upper and lower and get similar values to the manual, but there is no write up on how to check the instrument panel fuel gauge, it goes up and down like it should so i spose i should be happy.

R = 604 ohms, V = 12V, I = ?
A quick calculation using V = IR , V / R = I
I = 12 / 604 = ~ 0.02Amps or 20 milliamps
But that dosnt include the resistance of the gauge and wires, only the sender. so 35 milliamps is probably ok for an empty tank.

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Technical | How To / Quick electrical Question: How many milliamps?
« on: December 21, 2012, 06:32:31 AM »
Agility 125 08' 13000km
I've had a problem with a faulty fuel gauge sender unit. Does anyone know how many milliamps the sender unit draws?
I got another one from the wreckers and just installed it.
Got the following current drain when ignition is in on position:
Sender unit 35mA
winker relay 10mA
DC CDI box   5mA
Tot ~50mA
Ammeter in series with battery.
ignition in off position gives 0 milliamps.

Is this right or have i got a leak somewhere?


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Agility 125 / Re: Engine dies when increasing throttle (movie)
« on: December 18, 2012, 11:42:33 AM »
Now shes back together and going well Thanks everyone for ur help :)
Quote
Since the troubleshooting "holy trinity" is fuel, compression, and spark . . if cylinder compression checks out, might be time to consider an ignition issue.
I know i should probably have checked the compression I'll get there one day...

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Agility 125 / Re: Engine dies when increasing throttle (movie)
« on: December 18, 2012, 11:37:02 AM »
Then the postman came with a package the same day, an ebay gy6 dc cdi that id ordered 3 wks earlier on the off chance it would help (only $15 worth a try) popped her in and whamo! smooth revs.
Later on also replaced the coil and plug wire (hope i didnt go too cheapo on this one $7), seems to work well.

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Agility 125 / Re: Engine dies when increasing throttle (movie)
« on: December 18, 2012, 11:31:29 AM »
Wow its been a bit of a bugger this scoot, but I've finally got all systems go.
It turns out that i had two problems:
One was the carb
The second was the dc cdi box

I'm still a bit unsure of what was going on with the carb, but i did notice some differences between the old carb and the one i got off the wreckers. Firstly the build quality was way better, i think my old carb was built on a Friday afternoon just b4 Chinese new year, shiit. Slight stepped wear on the needle slide, needle slightly loose in holder, cracks in metal, made from less metal even though same model (maybe an upgrade?), anyway once i replaced the carb, engine did not die out like b4, but it didnt run smooth either, couldnt hold revs.


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Agility 125 / Re: Engine dies when increasing throttle (movie)
« on: December 10, 2012, 12:55:58 AM »
Heres another pic of the carb cracks, scratched the surface a bit to see the extent of the cracks. Apparently in production there are ways of making the higher porosity metal occur around the least important area of the casting. I imagine the atmospheric vent would be that area. Since small cracks only get bigger over time its possible this is the prob.

Possible solution:
Found a 24mm GY6 carb on Ebay for around $40, so might give that a go, usually stuff out of China takes forever to get here though.

Also thinking of just glueing it up just to test if it really is the prob.

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Agility 125 / Re: Engine dies when increasing throttle (movie)
« on: December 10, 2012, 12:19:24 AM »
Quote from: tortoise on December 06, 2012, 03:41:23 PM
Don't mean to insult your mechanical intelligence, but when troubleshooting one should never assume anything.  You have already performed the VERY BASIC maintenance procedures of checking intake and exhaust valve lash, and cylinder compression . . RIGHT!

No I didn't check the valve clearances, engine sounded ok so didn’t bother, (yes I agree assumptions are a big problem in trouble shooting and I'm guilty as charged) so after ur suggestion Tortoise I have now:
IN:      0.12mm or  0.0047244 in
EX:      0.11mm or 0.0043307 in
I figured they are pretty close to spec. 0.12mm and wouldn't be the source of the prob so I didn't change anything (correct me if I'm wrong).
I don’t have a pressure gauge so the compression test is a bit difficult for me. I imagine if the pressure is too high there would most likely be too much carbon build up around the combustion chamber. I'll see if I can buy/borrow a gauge.

The reason I'm here is firstly to learn more about engines/scooters because I enjoy it and secondly to fix the scooter. So don't be worried about insulting intelligences, that’s just a roadblock to learning. The best way to solve these problems is for me to give the right info (and not to make assumptions) and get the right advice.  (even if it is hard to take, at least we get to the heart of the problem).  My mechanical ability is ok, I've been through a few bikes in my time and did a lot of maintenance and repairs on them, but I still have a lot to learn and hope I'm in the right place to learn it.
I'm enjoying working on this scooter and hope that what I've learnt (which might be rather basic) will help other people in similar situations.


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Agility 125 / Re: Engine dies when increasing throttle (movie)
« on: December 10, 2012, 12:11:37 AM »
Quote from: tortoise on December 06, 2012, 03:41:23 PM
Sometimes the crankshaft flywheel woodruff key will shear, causing an ignition timing issue.  Poke something like a plastic straw into the spark plug hole to feel when the piston is at top dead center, then check if the flywheel timing mark is aligned.
Already had the tappet cover off so checked TDC on cam chain and flywheel, both aligned.

10
Agility 125 / Re: Engine dies when increasing throttle (movie)
« on: December 10, 2012, 12:09:41 AM »
Quote from: tortoise on December 06, 2012, 03:41:23 PM
Might also check if the insulator spacer between the intake manifold and cylinder head is aligned properly and not cracked.


aligned and no cracks. Note: viewed some carbon deposits on top of the intake valve.

11
Agility 125 / Re: Engine dies when increasing throttle (movie)
« on: December 09, 2012, 11:23:23 PM »
Here's the inside of the vacuum diaphragm chamber showing a rough area which corresponds to the previous pic.
Any thoughts on this one?

12
Agility 125 / Re: Engine dies when increasing throttle (movie)
« on: December 09, 2012, 11:13:49 PM »
Quote from: deaneop on December 06, 2012, 10:08:59 PM
Most def a fuel issue i had a bike that done exactly this turned out to have a worn throttle needle and very very small hole in diaphram.
Quote from: tortoise on December 06, 2012, 03:41:23 PM
Really scrutinize the carb diaphragm for tears.

On the weekend I was able to find the time to really scrutinize the carb and a friend pointed out a very interesting area near the atmospheric vent that I had previously assumed to be surface roughness. But actually on close inspection, under good light, there seems to be a series of cracks (porosity) which may lead to the vacuum diaphragm chamber. Have a look at the pics.

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Agility 125 / Re: Engine dies when increasing throttle (movie)
« on: December 06, 2012, 06:33:03 AM »
and the other side, wanted to take the variator apart too while i'm at it.

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Agility 125 / Re: Engine dies when increasing throttle (movie)
« on: December 06, 2012, 06:16:54 AM »
Took the muffler off today to see if any difference possibly due to something (carbon?) obstructing flow.
ran the engine without it, bit noisey, no combustion at higher revs a bit more noticable.
See vid:





Thinking of taking the carby apart again just to make sure.

The scoot is pretty much bare essentials at the moment:

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Agility 125 / Re: UNABLE TO START WITH THE KEY SOMETIMES??
« on: December 06, 2012, 03:59:01 AM »
A colder engine will always be a bit more difficult to start, the battery also loses voltage faster in cold weather, making it difficult to turn over the engine.

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