It should be a strong jet of water , a dribble would mean you nead to replace the impellor / pump or you have a blockage, I take it this is in the water and not on flushing muffs as you can sometimes get a poor stream on muffs,
The outlet at the lower cowl on the V4 loopers is quite large compared to the 1/8" elbow outlet at the engine, so the stream is not as strong as one would see with the smaller fitting used on crossflows and other models.
oregonboatnewb posted a picture of what the stream on his 140 would look like at idle:
My 150 squirts harder than that at idle. It squirts back several feet at idle and will clean your hand at speed. In more accurate terms I have 2-3 PSI at idle and 25-30 PSI at WOT.
The picture looks like a dribble... is that really running at idle? It looks like that engine is moving along at a pretty good clip.
