Carb Question

joelauletta · Sep 5, 2016

I am running a Cat w/twin OS 81 VR-M. Both motors are flowed the same. They both run and sound great. Here's the issue When running one carb is spitting fuel out the front the other is not. I have run OS motors and none of them have spit fuel yet run good. What could be causing this?

Danny King · Sep 5, 2016

Too much intake clearance. On the engine that spits fuel check the drum/disc clearance.

When you say the run and sound good, is that on the water as well as the stand?

Ray Sametz · Sep 5, 2016

If on the bench, sure one isn't running backwards.

Danny King · Sep 6, 2016

Ray Sametz said:
If on the bench, sure one isn't running backwards.

Good thought too. I missed the CAT part. That's why I asked if it ran in the water. We will find out.

joelauletta · Sep 6, 2016

runs good on the stand & in the water. Not running backwards

Danny King · Sep 6, 2016

Then it's most likely rotor or drum clearance or rotor or drum timing.

joelauletta · Sep 6, 2016

Thanks I'll check that

ids987 · Sep 6, 2016

Otherwise, rich low end needle setting perhaps ?

This would affect the idle speed running, but you may be compensating for it.

You said both motors flowed the same, but did you flow them at more than one throttle setting, or just W.O.T ?

Thinking one could be richer on the LSN, but leaner on the HSN, and still flow the same at W.O.T.

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