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Post by spandi on Jun 16, 2013 1:22:18 GMT -5
Let us know how it went. (although I suspect you just might have nailed it.) But even still for 30 bucks the Mikuni is still cheap insurance.
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Post by scooteraddict on Jun 16, 2013 8:31:17 GMT -5
[replyingto=barnie]barnie[/replyingto]If this happens when going up hills, its a classic sign of your carb float being too low. This will not allow the bowl to hold enough fuel. Now if the problem goes away if you take the diaphragm off and on and corrects the problem, then the main jet needle. It gets stuck in the up position. When opening the covers allows you reset ten needle. Hope this helps.
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Post by spandi on Jun 16, 2013 13:54:28 GMT -5
Good idea. (the float bowl) He may wish to check the float bowl needle for gunk or corrosion.
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Post by richardthescooter1 on Jun 17, 2013 9:48:26 GMT -5
I adjust float when I had carb off, put back on and had a heck of a time starting scoot, test drove and (yep shut off going up to 50mph, check feul line to pump, gas flow good, took pump off, it looked good to me, put back and (spray some cleaner in the inake line, starts fr a few seconds and shuts off, got gas to filter, took filter off clean with carb clean, put back on, still gas to filter, no ghas to carb  |
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Post by barnie on Jun 17, 2013 20:15:40 GMT -5
Richard, open the carb bowl drain screw and drain carb, the close screw and crank engine a some and then open the carb bowl drain again and see if u get a decent amount of gas out of the drain hose. If it does that would indicate that the carb is at least getting gas. It has to crank for a little bit to fill the bowl in carb. Your valves are adjusted good so u get maximum vacumn correct. Remember the older cars that when u stomped on gas the vacumn windshield wipers would quit till u let up on the gas, that's the same thing that happens at wot. the vacumn drops way down where if you pump is weak the gas quits flowing and the engine runs off what is in carb bowl, When that's gone the engine quits. Then u have to crank for a bit to fill it back up and away u go. Keep searching, u'll find it. Barnie  |
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Post by ridecheap on Jun 18, 2013 10:22:56 GMT -5
Richard, open the carb bowl drain screw and drain carb, the close screw and crank engine a some and then open the carb bowl drain again and see if u get a decent amount of gas out of the drain hose. If it does that would indicate that the carb is at least getting gas. It has to crank for a little bit to fill the bowl in carb. Your valves are adjusted good so u get maximum vacumn correct. Remember the older cars that when u stomped on gas the vacumn windshield wipers would quit till u let up on the gas, that's the same thing that happens at wot. the vacumn drops way down where if you pump is weak the gas quits flowing and the engine runs off what is in carb bowl, When that's gone the engine quits. Then u have to crank for a bit to fill it back up and away u go. Keep searching, u'll find it. Barnie Yeah sounds like you need to ditch the non electric fuel pump no or not enough vacuum going up the hill and get the Mr Gasket electric fuel pump with a small amount of PSI not to much like fuel injected. |
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Post by richardthescooter1 on Jun 18, 2013 11:57:44 GMT -5
Thanks ridecheap, got cheap vacuum pump from ebay coming, just going to try it to make sure that is the problem. the pump that came with scoot is a Mikuni, bought scoot in 2010, had 2,000 miles, now 15,000 miles  |
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Post by wentwest on Jun 18, 2013 17:50:29 GMT -5
I have been struggling with this same thing, hesitation, poor starting, power loss at wide open throttle, missing on hills. I tried a lot of things including a new vacuum fuel pump, and finally bought a Carter P60504 electric fuel pump and a Purolator #53 adjustable fuel pressure regulator, both on Ebay, installed them, set the pressure to 1 pound psi, and it started in a flash, idled smoothly, and runs without any problems. I think I fixed the problem. It's been such a long struggle, I am not sure it's really OK, but I've got my fingers crossed.
The fuel pump cost me $30 and the regulator was $21, shipping included.
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Post by ridecheap on Jun 18, 2013 17:57:15 GMT -5
Thanks ridecheap, got cheap vacuum pump from ebay coming, just going to try it to make sure that is the problem. the pump that came with scoot is a Mikuni, bought scoot in 2010, had 2,000 miles, now 15,000 miles The Mikuni is a aftermarket fuel pump but its not electric right? The Mr Gasket electric fuel pump has a micro fuel filter included puts out 4PSI. |
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Post by richardthescooter1 on Jun 23, 2013 9:14:06 GMT -5
Here is what I went with DF-44 Mikuni fuel pump, test drove yesterday and it made 60-65 easy, but in the hill choked twice but didn't shut off, had a/f set at 3 turns out, last night turn a 1/4 turn leaner, will test drive today. Attachments:
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Post by richardthescooter1 on Jun 24, 2013 18:16:43 GMT -5
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Post by alleyoop on Jun 24, 2013 19:10:44 GMT -5
Good job Richard, those are nice pumps and pump a lot of fuel and can also be rebuilt if need be.
Alleyoop
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Post by richardthescooter1 on Jun 25, 2013 10:59:40 GMT -5
Thanks Alleyoop ;D
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..BAD TO THE BONE..