Suzuki DF140 Bogging Down at 2500 RPMs

Westie · Posted: Sun Oct 06, 2019 10:25 pm Post subject:

So I have 3.5 hours on the new engines...they are sexy! I've noticed a little less thrust so far. I use to plane at 3200 rom but now its taking 4000rpm. I do have my tanks topped off which is rare, so it could be weight and/or tight engine.

I have been adjusting my rpm up and down every couple minutes during early break in.

I kept my old props. Question - would other props work better with 2019 DF140s than 2007 DF140s?

I was very happy with my pre-repower performance. Its ok now, but was expecting better.

Could also be throttle cable adjustment.

Thoughts?

thataway · Posted: Sun Oct 06, 2019 11:05 pm Post subject:

Props should be the same. Suzuki "Water Grip" props are apparently a bit more than just the hub. Something you might want to look at if the situation does not improve down the line. There is a lot of difference between the 150 and 140 (more than the nominal 10 hp would suggest). We used to cruise in the mid 20's at 3200 with the 150's. The 800 RPM is more than I would expect with just break-in--could be extra weight, or other issues, like bottom condition etc. You won't really know until you can do continuous WOT to test out what the full RPM and speed is.

Westie · Posted: Mon Nov 04, 2019 6:39 pm Post subject:

Got past the 6 hr variable RMP time and opened them up. Very happy! I think the torque is a little different but my cruising speed is the same. It just feels different to me but its a sweet ride!