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Bike cuts out on heavy throttle

02:32 AM 04-07-2014
About the only things left to check -

Make sure choke knob hasn't advanced out on it's own - noting black plugs as described.

Drain sample of fuel into clear jar from float bowl drain screw -
to verify only gasoline is the sample w/o water, scum.

If the Scoot sat all winter with old fuel - might be forced to go through the moves of rebuilding the carb w/o parts - to make sure it's to factory clean status at the jets & ports blown out by compressed air.

Knowing what it's not - is easier to follow up the chain.

In some rare cases - the ECM wires were found damaged in that mass of wires that exit the ECM near the battery.

Best if Luck - it will get sorted out.
03:33 AM 04-07-2014
Assuming you've fixed the petcock leak.
Is it falling on its face when you accelerate hard.
Prier to te trouble did you have the seat off. If so then you most likely have a broken ECM wire. Usually the black one on the right side about 1" out from the ECM and may be broke inside the casing.
The way to check is to slide a safety pin into the ECM and down the wire 2" slide another threw the same black wire and connect a jumper wire with a alagator clip on each end and if your problem goes away then you have found your problem.

08:14 AM 04-07-2014
Did you get the fuel to stop coming out of the relief hole on the petcock? Those diaphragms are very prone to a small tear. Was the spring in place?
09:04 AM 04-07-2014
++1on carb rebuild...I had some of the same issues on my first 1300S (2003). It needed carb rebuild. diaphrams were cracking with age. I had about 90K on the bike at that time. Fixed up the acceleration cut out as well as improved the starting & idle performance. Enjoy the ride!
10:49 AM 04-07-2014
1) Put the petcock valve in the off position.

2) Remove the vacuum hose from the petcock valve and apply an external vacuum to the petcock valve. You can use a vacuum cleaner.

3) Remove the fuel line from the petcock valve and install a hose. Put the hose into a container.

4) With the vacuum applied to the petcock valve and the fuel hose from the petcock valve in the container, turn the petcock valve to either reserve or normal.

5) Watch the fuel flow into the container. It should be fast with no bubbles (that's if you use a clear hose to see the flow).

6) If it's not flowing fast, then its your diaphram inside the petcock valve. There are two diaphram halves that are joined together. What's happening is that the diaphram next to the vacuum side is pulling but the second diaphram at the fuel side is not being pulled together thus causing the fuel passage to be slightly block.

The above is a simple test to trouble shooting 101

04:40 PM 04-07-2014
JUst want to add a safety issue -
Using Vacuum Cleaner is not really a safe device to use.

Fumes could load into canister - and bypass through the electric motor -
Possibly huge effects not intended.

Using the Mity Vac is preferred - about $30.

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