Crossfire 700 top speed problem - Page 3 - - Arctic Cat Forum
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post #21 of 25 Old 01-05-2017, 08:11 PM
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Originally Posted by Robcrossfire View Post
Well I guess you may have been onto something about the compression. Was out today to see what rpms I was pulling and I blew it up.
One thing that I noticed as I started to tear it apart are the powervalves are insanely hard to get out (despite me cleaning them about 300 miles ago) could this be the reason why she blew?
With these cylinders being nickel plated that means if there are any marks on them they need to be replaced too?

that looks like melted aluminum on the valves from the piston failing. that is why they could be tough to get out. any marks in the cylinder you will need to replace them.
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post #22 of 25 Old 01-05-2017, 09:06 PM Thread Starter
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Originally Posted by GregB View Post
that looks like melted aluminum on the valves from the piston failing. that is why they could be tough to get out. any marks in the cylinder you will need to replace them.
Yea it looks like its going to be an expensive job. One on the jugs is done for sure
Ive never done a top end on a blown engine. I assume I should be getting into the bottom end and making sure its all cleaned up, am I correct by saying this?
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post #23 of 25 Old 01-07-2017, 03:38 PM
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In all seriousness, it's not a bad idea to do a cylinder pressure check the end of or before the season. Any more than a few PSI difference between cylinders or 7-8% drop from factory compression should warrant a top end rebuild before you get to meltdown point or irreparable cylinder damage. But........sometimes they just melt down on ya.
Condolences on the loss of your piston. Positive vibes sent.
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post #24 of 25 Old 04-13-2019, 12:44 PM
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Last edited by birkato; 04-13-2019 at 12:49 PM.
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post #25 of 25 Old 04-13-2019, 08:19 PM
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Originally Posted by birkato View Post
My post can be deleted
Wondering why you’d want it deleted? Your original post is completely within line of you seeking good advice.

The 7400 rpms you listed in it, are similar to the 7200 that Robcrossfire was experiencing. (Still too low for that model sled/engine combo)

Just sayin’, you have a legit question there.

Who, me?! Don't listen to me.... (I don't know anything, evidently...)

If it's cnote approved it will work good
Originally Posted by DonoBBD View Post
That is freeking sick man........
0637-185: '99 Sno-Pro APV (guide and button) update kit p/n...
0637-186: '99 Sno-Pro APV superseded valve inserts update kit p/n...

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