Senior MTF Member
Join Date: Oct 2006
Location: State of Happiness
Subaru Robin or Honda? Need some advise
I'm going to be buying an v-twin engine soon to repower one of my Gravely riding tractors and need some advice from people who are knowledgeable with Subaru-Robin and Honda engines. I've got all the Gravely specific info sorted out, so now I'm just looking for more information on the expected life, reliability and operator reviews for these particular engine brands. Parts availability and cost information would also be a plus too.
I'm looking at the Robin EH72 and the Honda GX670 or possible the GX690. I've done some research on the build quality of both the Honda GX690 and the Robin EH72 and both seem to be built pretty well. I haven't found much about the internals of the GX670, but maybe I'm not looking in the right spot. Some of the features of the GX690 are: forged steel crank, fs rods, hemi heads, cast iron sleeved cylinders and a 3 year warranty. It should be noted that the GX690 uses removable cylinders that seperate from the block, where as the Robin uses the more conventional die cast "all-in-one" aluminum block and cast iron sleeved cylinders. Both the Honda's use a 2-BBL carburetor as opposed to the Robin which uses a single barrel, but I wouldn't think that really attributes to the reliability or longevity of the basic engine. As for the Robin, the EH72 features an over-sized ball bearing on the PTO side, forged steel crank, replaceable bearing on the flywheel side, and a 3 year warranty. So, while there are some similarities between the two, there are some differences that were noted.
I've had some experience with Honda's line of 13HP water-cooled inline twins that were used on their riding mowers, as well as the small 4HP lawnmower engines and they have proven to be fairly reliable, but I have no knowledge or experience with the Subaru-Robin engines or the Honda air-cooled v-twins. I've heard that Honda's line of v-twins isn't as good as their single cylinder engines, but I'm not sure how true that is. Can anyone comment on the Subaru-Robin and the Honda v-twin engines? If you've used them or own them, how do they compare? Any problems or issues that you've come across?
Thanks in advance for any input.