Yanmar 3YM30 injectors

[windward34]

Looking for some advice here my engine has a strong vibration at idle as soon as I give some RPMs it goes away. My mechanic has checked fuel, engine mounts not the issue. We think injectors might be next step. Though5 they would be inexpensive but Yanmar distributor want $264.00 each. I guess question is I find other injectors on line using same part number for half the price. Wondering if anyone has gone with after market vs OEM or am I going down the wrong path to save $300 bucks.

If anyone has had similar issue would love to hear the fix.

[Wotname]

My guess is that the injectors are probably OK. If the vibration is only happening at idle, then a small adjustment of idle rpm will fix the problem of the vibration. All engine installations result is some natural harmonics and these can't be avoided, especially in 2 and 3 cylinder small light engines. Yanmar mentions this in their earlier manuals.

For instance, my previous 2GM20 would vibrate badly around (IIRC) 2,400 but was perfectly OK 100 rpm either side of 2,400. Also, it needed the idle set about 50 rpm above the manual figure.