I'm thinking fuel pump:

[richardthescooter1]

The other day at WOT my scoot shut off, even giving it a little gas in carb, would only run until it was used up, had my buddy haul it home, today started and its acting the same way. Now its dying when I'm trying to give it throttle, it idle good. I'm ready to put a electric pump on. What do you Dawgs think?

[spandi]

Did you try the Mikuni first?

[richardthescooter1]

That's what I have, been on the bike before I bought scoot, had scoot since feb of 2011 and I have over 15,000 mile on her. My main problem is at WOT, I read that at WOT vacuum is about 0, today as I rode anything over 50mph it starts choking, like its not getting gas.

[richardthescooter1]

Here is pump

[spandi]

15,000 miles? It might be time for one of these.

http://www.juniorspecialties.com/cat...roducts_id=274

Didya also check your jets for gunk?

[smoak]

Are you sure it is a round mikuni and not a Chinese JinBo knock-off?

Mine is the same bike as yours, and it had a JinBo pump which started to fail on me. I just replaced it with the new rectangular genuine mikuni vac-pump, and it starts right up first hit now, and the motor idles a lot better.

I thought about going with an electric, but I worried about wiring it up. I have seen people wire them to something like the radio hot wire, which is only hot when the key is on.

My concern is that if I turn on the key and then have to step away for a moment that the always on electric pump will flood the carb... Or, do the elec pumps have built in safeguards against that?

Smoak

[richardthescooter1]

spandi, I've adjusted float, a/f, but I've never check or clean carb jets. smoak here is my pump

[smoak]

Originally Posted by richardthescooter1

spandi, I've adjusted float, a/f, but I've never check or clean carb jets. smoak here is my pump

I don't think I have ever seen a Mikuni that looked quite like that!

I got my rectangle Mikuni on eBay for about $20 shipped. I don't know how much an electric costs, but it might be worth your while if they are expensive to pick up a $20 pump.. If nothing else you would have a good spare!

If you go electric, please let us know how you end up wiring it, and if it gives you flooding problems.

Smoak

[spandi]

The Mikuni I have is round. (nicknamed it "The Hockey Puck" after Don Rickles )

http://www.amazon.com/Mikuni-Fuel-Ou...ound+fuel+pump

[richardthescooter1]

Hi spandi, yesterday JR suggested for me to check the ignition wire on my CDI in case that was the problem, last nigh I check it and it was loose, fix it and now nice and tight, today I'm going take carb off and clean all those jets, and I may still upgrade the fuel pump, the one you showed me, what is the capacity (gph)?

[spandi]

I found this from Mikuni. Although the DF52-176 isn't listed, I have no reason to think it would not be the same as the other round models, at 35 liters per hour or about 9 and a quarter gallons per hour U.S.

http://www.mikuni.com/c-fuel_pumps.html

P.S. just be sure whatever model you choose the nozzles line up with the way the hoses are going.

P.S. P.S. I was thinking maybe this is not just one particular thing going wrong, but maybe a series of small malfunctions happening at the same time, i.e. "The perfect storm" syndrome.

[richardthescooter1]

Well today I decided to take my carb off and check those jets, This is the first time I ever took the jets out, man were they clogged up, the main jets had maybe two open holes and the pilot jet only one, soaked them good and long and wire in the holes and cleaned the with carb spray and used my air nozzle to blow air through them, got carb back in and running, now I just have to put everything else back together and then the test drive.

[spandi]

Hope everything works out, even if it didn't cause the scoot to conk out going uphill, a gunked up carb couldn't have been a good thing.

[richardthescooter1]

test drove scoot (yep shut off going up to 50mph,) got scoot back home after pushing her about a 1/4 mile, chech fuel line from tank to pump (gas is flowing good), took off pump and looked in side, as far as I could tell pump look ok), put back on and cranked, (no go) sprayed carb cleaner in intake line and scoot well start and runn for a few seconds, gas in fuel filter about a foot from carb. I think fuel pump.

[richardthescooter1]

I orderd fuel pump, should be here maybe today, will let you guys know how it goes.