I bought a brand new BF40 in the spring of 2018. From the first time the motor ran, it has really been running "rough" not like any other Honda motor I have ever run. I have talked with Honda and the dealership I purchased it from many times over the last 2 seasons, only to have the exact same problem still occurring. I am hoping that posting in this thread will shine some light on the issue to help me push Honda/Dealership to get the issue resolved. Any help would be greatly appreciated!
Here is a description of the problem:Starting engine from cold is fine, idles OK. Put it into gear and has a bit of a sputter at very low RPM. Add throttle to 3400 RPM, runs smooth for roughly 60sec +/-. RPMs jump to roughly 4000RPM, on its own. Will run that way for a couple of seconds, then drop down to 3000-3100 RPM and then runs "rough". By "rough" I mean a "sneezing" or "sputter", and runs like the engine is very "bogged down". Occasionally without any real pattern I have been able to notice, the RPM will climb back up to 3600-3800 or so, and then drop back down again. Taking throttle down to idle will produce a very rough idle while in gear and an OK idle when in neutral. This will occur like this on/off for as long as the motor is running and warm. When it cools off (overnight) it will do the same thing again. I can reproduce this issue at other RPM's, and still occurs, but the "sneezing" is less noticeable and the RPM jumps are less dramatic.
Things that I/dealership/Honda have checked. Fuel, (always good fresh no ethanol fuel with treatment as recommended by Honda, have run 10+ tanks all with same result). Checked/replaced, spark plugs, fuel diaphragm, filters, fuel lines, fuel pump, squeeze ball, fuel tanks. We have tried 3 different propellers.
I have read through countless threads on this forum and have found them helpful, and am hoping that you all can help me get to the bottom of this! Thanks in advance!
Here is a description of the problem:Starting engine from cold is fine, idles OK. Put it into gear and has a bit of a sputter at very low RPM. Add throttle to 3400 RPM, runs smooth for roughly 60sec +/-. RPMs jump to roughly 4000RPM, on its own. Will run that way for a couple of seconds, then drop down to 3000-3100 RPM and then runs "rough". By "rough" I mean a "sneezing" or "sputter", and runs like the engine is very "bogged down". Occasionally without any real pattern I have been able to notice, the RPM will climb back up to 3600-3800 or so, and then drop back down again. Taking throttle down to idle will produce a very rough idle while in gear and an OK idle when in neutral. This will occur like this on/off for as long as the motor is running and warm. When it cools off (overnight) it will do the same thing again. I can reproduce this issue at other RPM's, and still occurs, but the "sneezing" is less noticeable and the RPM jumps are less dramatic.
Things that I/dealership/Honda have checked. Fuel, (always good fresh no ethanol fuel with treatment as recommended by Honda, have run 10+ tanks all with same result). Checked/replaced, spark plugs, fuel diaphragm, filters, fuel lines, fuel pump, squeeze ball, fuel tanks. We have tried 3 different propellers.
I have read through countless threads on this forum and have found them helpful, and am hoping that you all can help me get to the bottom of this! Thanks in advance!