For the HPDI's the 200's are awesome in how they start/run and do very well on fuel.
However, there is a lot of reading in how to keep them going without causing downstream issues.
For me, what I have learned:
1. I run 2 micron fuel filters that are Racor S3220SUL. These must be changed every 100 hours whether you think they need it or not. This prevents issues with VST filter and injectors getting restricted.
2. Plugs should be changed every 100 hours.
3. O2 sensors should be serviced every 100 hours. Some folks have issues with them and others do not. I am still working on the cause of the excessive carbon buildup in the chamber. I believe Dennis might be on to something in the type of fuel and additives needed to keep it clean. I am switching over to Evinrude XD100 2 stroke oil, Switch from Startron and Ring Free+ to Stabil Techron Marine 360. and see how it goes this season. Not sure I need to switch from Ethanol fuel over to Non Ethanol as of yet, but that will be my next consideration if still have excessive carbon this season.
4. If you do find the HPDI's motors, they should have all filters on motors changed including the filter baskets on the injectors. Once you do this, in my experience you will not have to do it again if using the Racor 2 micron pre-motor filters as they catch everything that could cause a problem. I have not had to change them or service the VST filter in years as the Racor's are doing their job. I have 1300 hours now on them.
I am sure I can think of other things, but overall, they run great and would be better on fuel than the OX66's. I understand the 200 HPDI's are sought after motors for those that still like the 2 strokes. They are easy to work on and understand once you study them a bit.
Others might chime in here as well, whether positive or negative. I do think mostly they were troublesome due to fuel not being clean enough and also require strong batteries. I have heard the higher HP motors are more troublesome.
