Hi I have a 2012 rmk pro 800 and I'm getting 100 psi on mag side and 115 on pro side. What is the correct compression for these motors? And also would this be the cause for it coding a de7 code
2012 rmk pro 800 compression
- Thread starter Hoops1985
- Start date
There's no solid number: it varies a lot depending on the gauge, elevation, how hard you can pull, and so on. Usually you kind of have to come up with a "good" number of your own to work off of: at 4000', 135 is the best I've got off one of my sleds. Usually more important is the difference between cylinders: the general rule is less than 5% variation, so that's enough of a difference that I'd be concerned. A leak-down check is far more accurate, but I've got a car that was within 5% on a compression check, but had two cylinders test bad and one very bad on leak-down, so I doubt the news would get better (compression is more of a rough check, leak-down is finer). If you're getting det codes, there's a pretty good chance you've got a blocked fuel filter, bad injector, or other issues to track down. I'd look into the fuel filter first, since those tend to need periodic replacement. Unfortunately, if you're seeing det and compression doesn't match, there's a good chance you need a top end. If you take the y-pipe, exhaust valve, and spark plug out, you can get a pretty good look.
Mag side may have a rod bearing going south. Det and low comp is usually a sign. Better take that engine out and tear it down before you bust the cases.
No need to get crazy now dude. Thanks for the info though
