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Post by harleyracer59 on Sept 17, 2019 23:09:54 GMT -5
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goodkat
Scoot Enthusiast
Posts: 178
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Post by goodkat on Sept 18, 2019 0:16:42 GMT -5
harleyracer59 you're definitely right! Thank you for sharing your knwoledge. Indeed, that hose shouldn't be there. Now I start worrying about it. I'm wondering what made someone in the past to put it there. My guess is that the airbox was altered somehow and this is a fix. Tonight I'll have a look at it, hope for the best, I'll come back with the news. Going back a bit, the Giorno AF24 has the gas tank under the seat. What bothers me the most at this moment is the fact that the engine starts pretty revved up from my point of view (don't know what RPM because there is no RPM meter) and stays like this - Why I'm saying the RPM is too high? Well, the rear wheel starts spinning pretty fast. This happened after transporting the scooter layed on its left side for several hours. I avoided starting often since then but I made a video of it. What I've tried: - Checked the adjustment screw near the handlebars, it's loose so this shouldn't be the culprit. I also noticed that the throttle cable's outer shell is snapped near the adjustment nut. But so it was before, if I remember correctly. Don't know where to look at, to be honest. I wonder what happened during transport that might have caused this. To eliminate the cable possibility I will disconnect the throttle cable from the carburetor and I will start it again to see how it behaves. I also noticed that there is an automatic choke system installed on this scooter (by factory I think) - Is there a procedure to make sure it behaves like it should? Will be back with a video of how it starts.
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goodkat
Scoot Enthusiast
Posts: 178
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Post by goodkat on Sept 18, 2019 0:39:42 GMT -5
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goodkat
Scoot Enthusiast
Posts: 178
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Post by goodkat on Sept 18, 2019 13:11:47 GMT -5
So, right now I'm trying to fit the airbox and something is seems to be wrong but I can't imagine what. The contraption with the radiator hose was eliminated and I got down to this: The airbox bolts spot on to the transmission cover, clears the shock, etc. The carburetor is the standard unit as it seems, yet, there is a big-ass space between them.  |
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Post by harleyracer59 on Sept 18, 2019 13:54:02 GMT -5
what does your manifold look like? you carb looks a little more forward than the pics I found. or the air box might be a little short? ill see if i can find anything else.
next weird issue is,if your tank is under your seat, your scooter wouldn't need a a fuel pump like the af18 dio. it would be gravity fed.... very interesting. keep us posted. and most cameras these days are a zillion pixels (not really) so when you take pics. pull back a little bit with the camera. we can all zoom in it we need to. helps to get a view of the "big picture".
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goodkat
Scoot Enthusiast
Posts: 178
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Post by goodkat on Sept 18, 2019 15:00:27 GMT -5
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Post by harleyracer59 on Sept 18, 2019 15:38:17 GMT -5
I think your problem is the manifold. look how your carburetor sits at the edge of your reed block. in the pics I posted and the dio manifold I have, shoots back 2" or 3" behind the reed block. take a look at yours and let me know if you see what im saying. it kinda looks like you have an af05 or ab07 intake. ill dig through my mess and grab a couple manifolds and post pics for you.
and the oil pump should be gear driven by the crankshaft. that line to the manifold is where the pump injects the oil into the engine.
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goodkat
Scoot Enthusiast
Posts: 178
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Post by goodkat on Sept 18, 2019 16:49:52 GMT -5
Good explanation for the oil pump. I thought it feeds oil in the crankcase because throttle cable splits in two - one strand controls the carburetor and one is linked to a valve on the oil pump. When you twist the throttle, the carburetor and the fuel pump valve are actioning in the same time. As you can see, I got 0 experience with 2-stroke engines. Only had 4T powered bikes till now.
To do: For sure I need to clean the carb and adjust the fuel / air ratio. Never did that before so I'll need a manual to bring the carb to the factory settings...and rear brake. But first I need to fix the damn airbox / intake manifold.
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Post by 190mech on Sept 18, 2019 18:29:15 GMT -5
I'll have to agree with harleyracer59,intake looks too short for that airbox...  |
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Post by harleyracer59 on Sept 18, 2019 19:42:29 GMT -5
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goodkat
Scoot Enthusiast
Posts: 178
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Post by goodkat on Sept 19, 2019 0:00:21 GMT -5
By looking on the picture, looks like that the AF 18 intake is what I need.
Before I start looking on the internet for parts, what do you guys recommend? To use the standard intake or go for an aftermarket intake / air filter?
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goodkat
Scoot Enthusiast
Posts: 178
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Post by goodkat on Sept 20, 2019 0:51:37 GMT -5
harleyracer59 I found the culprit!! Went on some russian forums and found this images:    sulfate chemical symbolThe scooter with red fairings is the one on the forum, the one with the gray is mine. Notice how long the intake manifold is on the red one. Now I need to source the correct intake manifold. Will be a bit of a challenge. Tonight I will continuie with the preparation for the technical inspection: rear brake. Any advices for this operation? The front brake was easy-peasy.
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goodkat
Scoot Enthusiast
Posts: 178
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Post by goodkat on Sept 23, 2019 2:11:35 GMT -5
Things that I did: - Cleaned the brake shoes for the rear brake, lubed the cable, now it works as expected. - Opened up the carb, cleaned all the gunk I could and then I got into this problem: This jet can be found near the main jet but it's not removable (by unscrewing but it can be removed if you grip it and twist it). I tried to clean it on the inside with a thin brass wire but no success. I could blow only a little bit of air through it, the light wouldn't even pass. I took a needle and after some struggle I did managed to get through it. Now I'm wondering if I didn't increase the bore of it. I don't know how it should look on the inside. Please check the attached photos. By any chance this jet should have inner variable diameter on the inside (A side of the drawing) or it should look like the jet in the B side of the drawing?     |
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Post by 190mech on Sept 23, 2019 3:49:08 GMT -5
That appears to be a press in pilot jet,You may have opened the orifice with the cleaning,only way to tell is run it and see if its too rich at idle..A pic of the carb base where it pushes in would help also..
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