Yamaha 70BETL problem!

[HydroliftErik]

Have a customer who has a Yamaha 70BETL -01
the engine runs great, but after 10-30 seconds it just stops!?
the idle is at 8-900 rpm.

i´ve checked following:

1. Cleaned carbs in ultrasonic cleaner
2. new gaskets for carb/intake
3. checked ignition timing
4. new fuel hoses
5. all new filters
6. cleaned fuel pump
7. new spark plugs
8. compression good
9. fresh fuel

anyone who knows the problem?

[boats.net]

Is it loosing fire to plugs when stops?

[HydroliftErik]

hmm, don´t know, how do i check that?

[99yam40]

Spark tester, timing light, or KV meter should show if spark is going away

a peak reading volt meter made for these ignition systems or a DVA adapter with regular meter to read the inputs and out puts of CDI if you do not have spark and are troubleshooting