Join Date: Sep 2007
Location: North Florida
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Re: Yanmar YSE 8 fuel injection issue?
I'm with Faster on this one -- more troubleshooting is in order.
If you replaced the injector pump with a new unit (or had the original rebuilt at a good shop), then I'd be very surprised if the pump is your problem.
I am not familiar with the YSE 8, but as Faster said it may be timing related. If you have a shop manual, read that section and check your engine against it.
What was actually done when the engine was rebuilt? Was any machining done or was it just a parts replacement exercise? If they didn't hone your cylinder you might be getting excessive blow-by, even with new rings.
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'85 BYB Vagabond 39