07 pol. dragon 700 blew up

[toddspolaris]

My buddy just bought this sled a few weeks ago with 3500 miles an it and it was blown up once before. They said the entire motor was new including the crank. My buddy did a little checking with the vin # at a different polaris dealer and they say yes all the updates have been done. So they load up and drive 620 miles to Barga and guess what, 150 miles into it and boom there goes another piston or something. He calls me and says get ready to rebuild this for me as we'll drop it off at your shop on the way home. Well I don't sell polaris, but pretty familiar with them. anbody have any thoughts onto maybe why this thing blew. What were the updates? I know I'll know alot more once I'm able to get my hands on this for the tear down. any ideas appreciated. Thanks Todd I will update also when I get this apart.

 

[switch07]

Is this a cleanfire? My 07 switchback 600cfi went through three pistons in 4500 miles. The first one coming at about 3500 miles. After each tear down the pistons looked like a cold seize with the damage to the pistons right at the coolant ports in the cylinder. After the third piston the sled is no longer in my trailer. After thinking about it and talking with my buddy, I really think I may have had an oil problem. Although my dealer said there was good oil coverage, looking back, I used less oil than my buddy's 600 etec. I would run over 300 miles on a quart of oil, since the sled was new. The last seize came in the middle of the day with a warm engine. How can that be a cold seize? I will be watching oil use on my new Rush like a hawk. Good luck and let us know what you find out.

 

[rp7x]

what ?

that's near 120 : 1 sometimes it's not that hard to be smarter than the dealer

 

[dragon_07]

I lost a piston in my 2007 700 dragon last year. The only thing that my dealer could come up with is that it must have sucked in some snow dust. It had around 4700 miles on it when it happened and thank goodness i took the four year extended warranty because polaris covered it. I do remember reading something about the stator coming loose on some of the 700's which i believe changed the timing and caused them to blow too. As far as updates: all i had done was a re flash.

 

[srt20]

Snow dust, wrong oil ratios, and bad intake boots all cause issues in 07 700s. I dont think stators were causing them to blow up, but??

08 has all the same issues except the to lean oil pump ratios. 08s are generally pig rich on oil. I go through close to 3 quarts in 300 miles. And my pistons look like new. I also sealed up my intake, and had the carb boots replaced at 2000 miles when it burnt down from the boots. 6400 flawless miles on it now.

 

[toddspolaris]

switch07, thats what happened to my buddy, warm engine and 75 miles from the cabin. Poof, can't be a cold seize after 75 miles of riding. They may have been in snow dust. I'll find out more tonight when they get back. Thanks everyone.

 

[xcsp]

May not be part of the problem here, but has the fuel filter ever been changed?

Sometimes an overlooked maintenance item.

 

[toddspolaris]

Update- tear down

Well, we got this tore down, ( what a pain in the -ss) anyways found broken rings on the mag piston. This was just rebuilt 130 miles ago buy a polaris dealer. By the way the rings were broke, and actually worked its way up and down in the ring land until it came out and caused problems, it really seems that maybe during the cylinder install of the last person to put this together may have acidentally cracked the rings and didn't know it. Thats what we are going on for right now. The cylinder is still in good shape, so we lucked out there. We will try to save the old girl one more time.

 

[nosparkplugs]

Toddspolaris is my hero !!!!!!!

 

[snowchief]

I had a 08 700 the crankshaft broke on the pto side there was two bearings with a gap between and they put one solid bearing in there to replace the two then about 2,000 miles later went down again not sure what caused this time took it into the dealer under warranty and traded it in for 10 dragon 800

 

[D.B. Cooper]

Well, we got this tore down, ( what a pain in the -ss) anyways found broken rings on the mag piston. This was just rebuilt 130 miles ago buy a polaris dealer. By the way the rings were broke, and actually worked its way up and down in the ring land until it came out and caused problems, it really seems that maybe during the cylinder install of the last person to put this together may have acidentally cracked the rings and didn't know it. Thats what we are going on for right now. The cylinder is still in good shape, so we lucked out there. We will try to save the old girl one more time.

Just out of curiosity, were the ring end gaps facing to the exhaust side rather that the intake side?

My bud had a piston installed at a well known ARCTIC CAT dealer in Northern Wisc.had a hole burned in the dome due to leaned out (2 sizes leaner riding on a real cold night full throttle 'cross the lake )

20 miles later it seized up.

We tore it apart, dealer neglected to hook up the oil injector line to that port/jug.

Friggin' dealers

BTW, 4500+ trouble-free miles on my 2007 D7.

1) Change the fuel filter at the start of the season,

2) always run premium fuel preferably BP from a gas station rather than a small tank (I realize this is not always an option)

3) Check for cracked throttle body boots,

4) and add a PC-3 or PC-5 RICHENED up in the mid-range by approx 10% to fix that LEAN condition 5000-6000 R.P.M.

Check out my TECH TIPS for 600/700/800 CFI's Thread I moved up to the top for you

 

[nosparkplugs]

ttt

 

[jprdave]

These sleds are known for a lean spot in the mid-range. Lots of burned pistons from nice easy 40 mph riding. Need to be in and out of the throttle alot. Any reputable poo dealer should know that. Power commander makes a module that fixes the problem, but it comes at a price!!