Dwight is our 2018 Sportsman ACE 570, and it has developed a new problem where it is very hard to start when cold, and it won't idle until it gets warmed up. It only happened occasionally at first, but now it is hard to start every day and takes a while to get it idling reliably. Once it is warmed up, it runs perfect. Fuel is good, throttle body is clean, has spark, no check engine light.
This led me to believe that there was an issue with compression. Unfortunately, these machines cannot be tested for compression traditionally, but I knew that it has a new top end.
In the end, I checked valve lash. Much to my surprise, the valve lash was too tight! This will definitely effect the compression which explains why it was hard to start.
Today is part 1 of this procedure. How to check and adjust valve lash on a Polaris 570 engine. I'll take it apart and measure the clearance. In next week's episode, we'll put it all back together!
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22 авг 2024
