nehmo
Scoot Member
Posts: 21
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Post by nehmo on Dec 24, 2017 16:24:46 GMT -5
Don't buy from Scooter Madness. Although I had high hopes Scooter Madness was honoring its warranty, I'm now convinced they are giving me the run-around. The emails they have sent me say they have ordered the part, but later emails say they "sent" the issue to parts. Plus, the process has been dragging on for months. I'll have to start a new thread regarding what their reputation should be. And I'll see what recourse I have via the credit card company.
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nehmo
Scoot Member
Posts: 21
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Post by nehmo on Jan 14, 2018 3:47:36 GMT -5
It's January 14, and we bought the scooter in October. Scooter Madness finally send us a replacement carburetor. They took so long, I thought they were just running me around. Apparently, they do stand behind their product; they are just really slow. I haven't installed it yet. It looks fine. Unlike the original carburetor, it has a flexible tube attached to the bottom of the bowl with a screw (valve perhaps) in the end. It must be a drain hose.
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Post by 90GTVert on Jan 14, 2018 8:57:34 GMT -5
Yes, the hose attached to the bottom is a bowl drain. The drain screw on the bowl itself is usually left open and the valve on the end is used to drain it. It's usually mounted to the CVT cover via that tab on it, which makes draining the bowl easier.
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Post by cagiva4ever on Feb 11, 2018 11:39:59 GMT -5
any UpDate on this pitcular Saga of issues....
specs data found on the warranty carb and other findings ?
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nehmo
Scoot Member
Posts: 21
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Post by nehmo on Mar 16, 2018 18:14:46 GMT -5
I finally got around to installing the new carburetor. It runs, kind of. It idles OK. When I give it gas it revs up and goes, but in a couple of seconds then revs down. It cycles like that, and I can't really use it. It's almost like there's a governor on the engine. What do I need to do?
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nehmo
Scoot Member
Posts: 21
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Post by nehmo on Mar 16, 2018 18:18:36 GMT -5
I finally got around to installing the new carburetor. It runs, kind of. It idles OK. When I give it gas it revs up and goes, but in a couple of seconds then revs down. It cycles like that, and I can't really use it. It's almost like there's a governor on the engine. What do I need to do? (I also posted this in the wrong thread. I'll correct that soon.)
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Post by 90GTVert on Mar 17, 2018 11:46:20 GMT -5
Sounds like it's lean. Most likely you need to install a larger main jet.
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nehmo
Scoot Member
Posts: 21
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Post by nehmo on Mar 17, 2018 16:26:55 GMT -5
Sounds like it's lean. Most likely you need to install a larger main jet. The behavior is a bit difficult to describe. When I give it gas, it revs up but then goes down. If I keep the throttle on high, it will continue to cycle like that up and down and up and down. It sounds like a construction compressor that has a governor on it. When it warms up, the behavior is a bit improved, but it still revs up and down. Actually, I, personally, didn't install the carburetor. Someone else did. I suspect there may be a vacuum leak. Wouldn't an insufficient jet just keep it at low rpm?
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Post by 90GTVert on Mar 17, 2018 19:14:25 GMT -5
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nehmo
Scoot Member
Posts: 21
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Post by nehmo on Mar 18, 2018 8:04:33 GMT -5
The rev up and down cycle is not as fast as in the video at your time mark. I get a few seconds of normal operation before it drops down. I'll make a video of it; then it will be clear.
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Post by 90GTVert on Mar 18, 2018 8:45:08 GMT -5
Never hurts to check for vacuum leaks. Make sure hoses are in good shape and the intake isn't cracked and carb is attached securely. I'm still guessing fuel supply. Either the main jet too small or a float level or actual fuel supply (tank, hoses, petcock, filter).
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nehmo
Scoot Member
Posts: 21
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Post by nehmo on Mar 18, 2018 18:43:15 GMT -5
Never hurts to check for vacuum leaks. Make sure hoses are in good shape and the intake isn't cracked and carb is attached securely. I'm still guessing fuel supply. Either the main jet too small or a float level or actual fuel supply (tank, hoses, petcock, filter). I just started it again today to search for vacuum leaks. I didn't find any with a simple spraying of starter fluid. I did time the cycles. At WOT, the cycles last 3 seconds from peak to low point. Thus, the whole cycle would be 6 seconds.
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Post by GrumpyUnk on Mar 19, 2018 14:23:13 GMT -5
From afar, it matches the description of lean surge. If it is somewhat like the video, where you can get on it for a few seconds and it falls on its face, (i.e., bogs) it can be caused by too much fuel or too little fuel. The accelerator pump is designed to help compensate for someone going from idle to WOT in one quick sweep. If it stumbles, it is likely the pilot jet is not providing good flow off-idle. You can open the idle mixture screw on the 'left' side(side with fuel line fitting), near the front left corner, and see if that improves or lengthens the time it will run before fading out. If that does nothing(it should help transition from idle to pilot system, adding a bit more fuel to keep it 'rich' for a bit longer), the it may be the pilot system is not taking over as the engine rpms climb. If it improves with increased temperature, it is likely a 'lean' condition. You might check that the accelerator pump link(long flat arm) on the other side of the carb, moved when the throttle is first opened, is being moved as soon as the throttle is opened. It is supposed to squirt a smidge of fuel directly into the airflow going into the carburetor, helping the mixture stay rich when the AIR moves quickly(less dense than fuel) on throttle open, and then the pilot and main systems would take over getting fuel into the mix as the fuel flow stepped up. Fuel, being more dense than air, will take a bit of time to get moving inside the carb passages/jets/emulsion tube, but will eventually catch up to the increased air flow. The accelerator pump squirt tries to make up for that delay. You should see a squirt each time you open the throttle plate. If not, check linkage and diaphragm, and the tiny hole in the float bowl for being blocked by crud. tom
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