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After changing belt, rollers and fair filter I needed to adjust the air/fuel mixture screw, when looking at the carb I noticed that the intake wasn't connected to it a there was a gap, there is no play in the carb because it is screwed in properly.

It is a 2 stroke lx50

Is this normal?

If not how can I fix it?
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Forum member supplied image with no explanatory text
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Molto Verboso
2007 GT200, 2008 Yamaha C3, 2009 BV250
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Molto Verboso
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Not it's not normal. The rubber part is supposed to be securely clamped around the aluminum part. Looks like you are missing the clamp. The airbox looks correct. Maybe you have a wonky intake manifold that is too short.
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Forum member supplied image with no explanatory text
⚠️ Last edited by Abner_Bjorn on UTC; edited 1 time
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UTC quote
Thanks for the info

How can I fix this?
Is this crucial or will it be ok?
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I bought the scoot in November so that means it's been running like that for months[/img]
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Molto Verboso
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No It's not ok. You are sucking un-filtered air straight into the carb. I very rarely say this, but you might be better off taking it into a shop.
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I thought that, thanks
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Is there any temporary solutions that I can do?
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Veni, Vidi, Posti
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See if the air box is mounted correctly. It should line up better than that.
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After doing the belt and rollers I reseated the air box and the screws went in perfectly
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Grumpy Biker
1980 Vespa P200e (sold), 2002 Vespa ET4 (sold), 1949 Harley-Davidson FL
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Your airbox doesn't seem to be mounted correctly. It looks like the back is sticking out way too far. Remove the screws attaching the airbox to the transmission. Try to position the airbox so the hose will align with the carb and the check the alignment of the screws attaching it to the transmission.
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UTC quote
There's probably a flange with a screw thread the air box needs to lift over.
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UTC quote
I'm not familiar with the LX502T. I don't know if it is case inducted or piston port, with or without reed valves. But it should be obvious where the intake manifold attaches to the engine. The front carburetor flange slips inside the rubber intake manifold, and is held in place by a hose clamp. On the other side of the carburetor, there is a piece of rubber duct, one end connects to the back side of the carburetor in the same way as the front side of the carburetor connects to the intake manifold, and a hose clamp holds it in place. The other end of the duct usually has a groove in it, and fits into a hole in the plastic airbox, forming an air tight seal. There is usually no kind of fastener to hold the duct to the airbox. The groove in the duct holds it in place.

If you have the intake manifold correctly bolted to the engine, and the carburetor correctly connected to the intake manifold, and the throttle cable, and all the wires and hoses fit on the carburetor properly, then the carburetor is probably in the right place. If so, there are really only 2 possibilities. Either the airbox is not in the right place, or you have the wrong duct that goes between the carburetor and airbox. It looks like the back side of the carburetor is at least a couple of inches from the airbox duct, and the angle of the carburetor and duct do not line up. If you are absolutely sure the airbox is mounted properly, you have the wrong duct. But I still think the airbox is not properly mounted. It does look like it sticks out too far.
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Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
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UTC quote
another vote for the airbox assembly not being installed or positioned correctly.
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Molto Verboso
ET3 & PX150 & GTS 300 Super Sport MY23 & Yamaha Neo's electric
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UTC quote
External inline image provided by member with no explanatory text

Piaggio seems to use a zip tie instead of a hose clamp.
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Thanks for all the help

So is there an intake manifold there or just the air box tube?
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I agree with the others, undo the screws holding the air box onto the transmission then lift it up a bit and move it into the right position.
Unless it's got a huge jet in the carb to compensate, it is its running with no air filter which means it's getting too much air. This could cause your engine to heat up too much.
When it's in the right place put a cable tie round the pipe that attaches to the back of the carb to seal it.
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Great thanks

So your saying that there is already a manifold there?
Or that the pipe will just fit over the carb?
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Should there also be a tube on the other side
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Veni, Vidi, Posti
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njackste wrote:
So your saying that there is already a manifold there?
Or that the pipe will just fit over the carb?
The pipe will just fit over the carb.
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UTC quote
So will I buy the manifold? Or is that only for 4 strokes
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Veni, Vidi, Posti
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UTC quote
Take all the airbox mounting screws out. Wiggle it around until it fits.
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UTC quote
Thanks very much

Should there also be another pipe on the opposite side?
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I would assume your carb is attached to the intake manifold on the engine or it wouldn't run at all.
The other end of the carb needs to be attached to the pipe coming out of your air box.
I've attached a pictures of what it should look like.
You can see in your pics the air box is sticking out a lot more and that is why the pipe doesn't reach the back of the carb.
Should be an easy fix, when the air box is unbolted just move it up and manoeuvre it into the right position where the pipe fits in the carb.
It then should bolt back into place.
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Forum member supplied image with no explanatory text
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UTC quote
Great thank you, in hindsight I realize that some of the air box screws were cross threading I'll correct this.
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UTC quote
Is this the other pipe?

Is it in proper it's just loose and it connects to the engine
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Forum member supplied image with no explanatory text
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Hi,
Yes, that's normal it's just a pipe that carries warm air from the engine to warm the carb.
It just points at the carb and doesn't attach to anything.

You will probably need to put the mixture screw back to where it was now it has an air filter attached.
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UTC quote
No problem thanks so much for your help

I thought it had no manifold so it would've been my mechanics fault and it's been running since November so I was annoyed that the engine life would be significantly reduced but now I know that it was just my fault and it will be ok.

I'm on a week break at the moment so I wanted to finish all the work soon but getting new parts takes a few days that I just don't have
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Hi,
Pleased you got it sorted.
It looks like everything you need is there to me, it just needed bolting back in the right place.
Cheers.
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Hooked
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UTC quote
Another thing is that my belt cover filter keeps falling out, what is the correct way to install it?
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UTC quote
Just fixed the air box and now it won't start, it cranks and you can hear the throttle and the headlight comes on but then it just dies
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2006 GTS 250
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UTC quote
znomit wrote:
See if the air box is mounted correctly. It should line up better than that.
That was exactly my first thought.
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