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Post by alleyoop on Jul 5, 2014 17:47:34 GMT -6
To each his own, but just an F.Y.I the hose from the pump to the carb can start deteriorating from the inside and all those little hose partials will get into the carb. It would take a pretty big chunk of something to block the pump, but it only takes a little particle to block up the pilot jet, not so much the main jet because that has a pretty big passage.
Alleyoop
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Junior
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Post by trailheadmike on Jul 5, 2014 18:00:08 GMT -6
Alley- I'm sure you're right - I only wrote that to say that I have it that way in the same scoot and do not have a fuel problem.
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Post by alleyoop on Jul 5, 2014 18:04:13 GMT -6
Like I said to each his own, all one can do is tell someone what can happen and why.
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Post by snechovski on Jul 6, 2014 7:52:33 GMT -6
Ok, here's something else to chew on. Lol, with the new 32mm carb on or the old one for that matter, when I take the air breather off the Scott will Rev to what ever I want it runs great but it runs out of fuel the filter goes dry and it dies then it starts back up after a few cranks.
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Junior
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Commuting is the best part of my day!!
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Post by trailheadmike on Jul 6, 2014 8:43:09 GMT -6
Bad pump or vacuum leak? One way to test is to take the fuel line off the carb and hit the starter (be sure you are prepared with something to catch to fuel that will or won't come out, depending on how the test goes). When it cranks, if you are getting a steady draw on the tank the gas will be pulsing out in strong bursts. I know because when i did it I was blasted in the face with gas. Based on your description i wonder if that stream will be good at first and then quickly die. That will identify the problem as fuel delivery. then we can go into subparts of the system to test.
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Post by snechovski on Jul 6, 2014 9:09:08 GMT -6
That's the problem, when it's idling or the breather is on its OK, it's when I take it off and hit the throttle. I pulled the line off and cranked it and fuel came out but who knows at what pressure? So it seems as if it has decent vacuum so what next? Lol
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Post by JR on Jul 6, 2014 9:15:15 GMT -6
Going to agree, the tank gravity flows to the pump and has enough weight by volume to push the gas to the pump unless it is nearly stopped up. Remove the one between the pump and carb, put a new one on the tank between the pump, make sure the hose here is as big as the filter inlet and for sure make sure it is not restricted as in a pinched hose.
Make sure you have a good tight vacuum line feed to the pump.....and that the intake manifold is sealing good especially where it bolts up to the head. Lastly if the valves are even slightly off the vacuum will be minimal and the fuel pump will suffer. The fuel filter between the pump and tank will/should be full for the most art at all times.
Simply put she's starving for fuel and I wouldn't adjust the carb until you remedy this problem. If it still is hurting then replace the OEM fuel pump with a Mikuni, none better. Also my gas cap was not vented and I took a very small pin drill bit and drilled a tiny hole in it, made a big difference.
JR
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Post by snechovski on Jul 6, 2014 9:18:40 GMT -6
Thanks Jr, and Yea I checked the cap and blew threw it with a air hose blowes great do I'll do the other stuff and then move on to a pump.. Thanks again all.
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Post by JR on Jul 6, 2014 9:19:35 GMT -6
Scoot came with a 30mm carb and you'll gain nothing by going to 32mm and will end up down jetting it to ever get it to run right, the bigger carb thing, waste of time and money. Why put a 32mm carb on a 30mm head inlet? It will only allow fuel at a 30mm ratio while on the other hand one can up jet the OEM 30mm carb and do better. It's like this if you reduce a 4" water to 1" then the only flow you have is then from a 1" pipe, same as with a carb, putting a bigger inlet carb on a smaller inlet head is nonsense.
JR
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Post by snechovski on Jul 6, 2014 9:51:30 GMT -6
The guy that came over to help me get the electrical problem fixed said it was a 27 or 28mm and the only reason I put this one on was because I put that exhaust on. I does run 10 times better with the new carb. And the plug is starting to look like a chocolate color
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Post by JR on Jul 8, 2014 21:34:08 GMT -6
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Post by JR on Jul 8, 2014 22:05:38 GMT -6
To each his own, but just an F.Y.I the hose from the pump to the carb can start deteriorating from the inside and all those little hose partials will get into the carb. It would take a pretty big chunk of something to block the pump, but it only takes a little particle to block up the pilot jet, not so much the main jet because that has a pretty big passage. Alleyoop Hose can deteriorate between the filter and the carb and do the same thing, no full proof system. The vacuum pumps were not designed for a lot of pressure and it does not have to push fuel from the tank to the pump but it does have to push it through a filter if it is in between pump and carb. I've never even found a lawn mower with a filter between the pump and carb and I have two mowers with vacuum pumps just like my scooters.
Good quality hose doesn't break down unless it's extremely old.
JR
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Post by ellpee on Jul 9, 2014 6:55:27 GMT -6
Makes sense to me that buying the best quality hose you can find is a smart investment. Heck, cars and trucks go for umpty thousand miles with the OEM hoses, and fuel injectors are surely at least as crud-sensitive as carburetor jets.
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..BAD TO THE BONE..
