Let me guess, your 2010 monoblock requires machining of the cases? Did you have wear marks on the intake side of your pistons from rocking against the bottom of the cylinder wall? I did, the stock pistons were so loose and the single ring provides such little support that they have some serious wear marks. Way beyond scoring. I will post some pics. You may have lucked out dropping your monoblock and having to buy a new one.
440 dart, I dont like the negative tude considering you dont have a d8, however I will give it to you that Yamaha produces way higher quality components than polaris. I think it has always been like this. Just for example look at the cast job on the intake area of the cases and in the transfers of the monoblock. I found a piece of mill debris the size of my pinky nail lodged in a inside corner in the intake tract of my d8. No surprise that good tuners can get big gains with a quality port job. Happy Holidays everyone and dont do anything too stupid.
The funny thing is that I do feel lucky that I dropped my mono block. Lol
Not many people would, but in the end I found some other issues that needed fixing. Don't think I would have found the throttle body boot issue otherwise. And yes, I can confirm that the 2010 mono block requires machining of the upper case on the older motors to accept the newer block. Inconvenience yes, but not a huge deal. They did beef them up quite a bit for 2010. I suppose I should get some comparison pics up here one of these days huh.
My dealer put me in contact with the guy that builds the race motors for the Polaris snow cross team. He is doing the work. I was considering having him port it too, but I just don't have the spare cash sitting around. I will be sure to look over the ports real well when I get them back. I was going to do a little cleaning and polishing anyway.
Yeah, the pistons were doomed to failure. I'm surprised some people were getting as many miles on them as they were. Mine rocked pretty bad in there and were showing an unusual amount of wear considering the short miles. I know there are motors out there running single ring pistons with no issue. See it dirt bikes quite a bit. I don't know that much about it, but I think things such as pin location and crank throw have a lot to do with side forces generated on pistons. Like I said, I just don't know enough about it. This setup just wasn't the best design for it I guess. Again, I can be thankful that mine never burned down. I think my time was sure coming though.
Happy New years to you as well. And yes, nobody do anything stupid.