2002 MXZ 700 Engine Tear Down: Part 1

[@Paisteboy]

@mcnamash Yes, I would replace both pistons if you can afford it. Save the good one just incase you run into another problem. I would also make sure that you get all of the debris out of the motor. If you don't it could to happen again. Check out the rebuild videos if you haven't already. Good luck and thanks for watching.

[@Paisteboy]

@redlense4 Yeah. That would have been a good idea. Thanks for watching.

[@Paisteboy]

@Dimpoe Thanks. Next time we will drain the system before tearing the motor apart. Thanks for watching.

[@mcnamash]

Since you have this apart would it makes sense to replace both pistons? I have the same issue, will be replacing at least one. Compression was a bit low on both before the ring broke on the one. Also, had a piece of ring or debris fallen in the crankshaft, what should be done?

[@Paisteboy]

@14waljar Please. They all break. besides, the problem was a c clip that popped out from the piston. It most likely was installed wrong by the mechanic that worked on it last season.

[@tonymuratore3156]

Thanks for the video. My 2003 legend 500 died, thought I blew a rod but after breaking down the motor the piston and rod and cylinders are fine. Pull cord and clutch are locked up. Any thoughts

[@Paisteboy]

Cool. Projects like that are fun. Thanks for watching.

[@uberaudioexperience]

Cool video. Seems like that type of stuff also happens to 2 stroke dirt bikes(top end wearing out fast). Are other sled manufacturers more reliable or is it the nature of the beast with high rev 2 strokes that are a few years old ?

[@dg-man211]

My 2000 mxz 700 smokes alot this winter, the last 2 winters it only smoked abit but now its really bad, smokes lots all the time, got coolant oil and fresh gas, im no mechanic so idk whats going on with it, so i decided to look around, any ideas on what it can be anyone?? One guy said maybe a gasket leak.

[@Paisteboy]

It could the lower end crank seal.

[@dg-man211]

@@Paisteboy how do i check that and also how do i drain the antifreeze, i wanna do some investigating today on my sled.

[@Paisteboy]

@@dg-man211 Start with a leak down test. I have a couple of videos on it. Here's a link. kzbin.info/www/bejne/qF7Jl32Ml9WYd9U

[@redlense4]

Hey Paisteboy. Weren't you supposed to drain the coolant first?

[@laststandcreatioins]

I gotta take apart my 2001 mxz 700 because my dads brother ran it without oil and blew the pistons.. These videos are very helpful with showing how to take it apart

[@Paisteboy]

Glad they helped. When you go to reassemble, I have new HD videos of that done recently.

[@laststandcreatioins]

Thanks.

[@gruhland]

Hey guys...great video of the tear down and rebuild...That piston was toasted...Could you tell me what kind of camcorder you used to shoot this...the sound and picture look great...Thx...Snow coming tonight !!!1

[@Paisteboy]

@YoGuy121 Proably fix it at home. My brother just had the whole bottom end redone by a mechanic friend of ours an it set him back quite a bit, and now this.

[@hyde20082142]

what are the black and red things above the y pipe?

[@YoGuy121]

@paisteboy Are you gonna fix it at home or at a mechanic because thats when the big money rolls in with the mechanic(I mean spending the money)

[@Paisteboy]

@LegittGod39 No, the scoring is from a piece of metal in the cylinder that shouldn't be there. Even dirt would do damage just not deep scores.

[@Paisteboy]

@tc25d Cool. Thanks for watching.

[@tkpettit5]

hey you were saying that you put BR9ECS plugs in that sled. Those are the plugs I switched to in my 2001 MXZ 700 and it helped ton with plug fowling. I would stick with them cause i find my sled runs much better now. I always run min 91 octane too. Love your vids, keep em comin!

[@drewdew6874]

was this from a c clip facing the wrong way. I think it happened to my sled. I didnt do the work though. C clip scored cylinder etc.

[@Paisteboy]

Not sure exactly which way it happened because we didn't do the bottom end rebuild but we know that one c clip was missing when we did the top end rebuild.

[@cogtag29DOM]

i feel like the pto side always shits the bed, my 03 rev blew that side but that was a bad pto seal

[@Paisteboy]

@YoGuy121 Yeah. it's still going to be expensive. Probably $300 or more parts only.

[@blakenewton2781]

A few points for those rebuilding Ski-Doo snowmobiles. You can basically get most sleds back to the late 90's on their parts diagrams. These will give exploded diagrams which are a big help. Next, the BR9ECS will not run hotter than any normal BR9ES plug. They all run the same temp regardless. Using Iridium, platinum or even V groove plugs helps combat fouling though. The comment made about loose carb boot studs is a serious indication of what may have caused failure. Again as stated in the video, it sounds like a shop "cheaped out" and didn't replace the pistons as a pair. I had the identical thing happen on an 809 triple. I just sold the parts and made more off the pieces than I spent on the sled.

[@Paisteboy]

Thanks for the comment.

[@Paisteboy]

@gruhland Thanks. I have Sony DCR-SR42. I bought it in late 2007. I use Sony Vegas to edit my videos and I can sharpen them and inhance the color with the program. If you check out my videos "White MTD Lawncycler LC 215 Lawn Mower: Part 1 & 2" you can see the difference between them because that was when I discovered the inhancing features. I tweaked it a little bit more from there. Lighting is key. In my garage, where I shot a lot of my videos, I have a bunch of fluorescent shop lights.

[@martinhajda2132]

One thing I have learned over the year after rebuilding many rotax rotary and series 3 engines is ALWAYS change the crank seals.

[@Paisteboy]

Yes. They go bad.

[@Paisteboy]

@tkpettit5 OK, cool. Thanks for watching.

[@codyraab1]

lol its ALWAYS the left side. my 95 Yamaha V-max 600 aint firing on the left side but both have the same compression at 120psi

[@bombidude]

Did you guys clean both carbs before your first ride?

[@Paisteboy]

bombidude No. The carbs were fine.

[@Dailystrokesforyoufolks]

I guess that piston just had it comin to it ither way that shitty luck nice sled tho man I love thoes I have nearly the same sled 01 mxz 800 mod great fun knock on would only had a carb plug up on me so far did you get it back togather?

[@Paisteboy]

Yes. Ended up doing a second rebuild because my brother ran it out of oil and blew it up again. That was a few years ago now. It's been running great ever since. Here's the link: kzbin.info/www/bejne/h3TOnYyebq13a7M

[@adeboer]

How did you hurt your arm??

[@ericace3744]

whats he using to take off the back part just before hidden hose

[@Paisteboy]

what time is it in the video?

[@ericace3744]

got it off n eveverything looks good

[@Paisteboy]

What was your issue?

[@ericace3744]

it was the pull cord ,i couldnt pull n tried turning clutch which only goes 3/4 either way

[@ericace3744]

once the top end is off what am i looking for , i see no damage

[@jathenwood2348]

Is this the same as a 800?

[@Paisteboy]

It's very similar but not the same.

[@jathenwood2348]

@@Paisteboy cause theres a tear on the tube that conneted to the antifreeze

[@jathenwood2348]

@@Paisteboy what do you recommed?

[@Paisteboy]

Replace that hose.

[@Northern_Farmer]

Well if the carb boots where loose it sucked air in and created a lean condition. Burnt down right away.

[@APinkMink]

I have a 2001 Mxz 600 and the same thing happened to the same piston

[@Paisteboy]

Do you know what caused the failure? In this case, it was a c-clip that came loose.

[@ericace3744]

can u tell why u got to this point where u have to tear down

[@Paisteboy]

Yes. When the bottom end was rebuilt the year before by a mechanic, the circlip was not properly installed and it popped out and destroyed the piston and cylinder.

[@ericace3744]

yes what did it do , first mine started stalled and tried again n stalled again third time i couldnt pull the cord , so i tried turning clutch and was able to turn either way 3/4 turn but not a full turn ,plugs r out

[@Paisteboy]

This sled did turn over but was running on one ctlinder. You can see if you watch my video kzbin.info?o=U&video_id=K6O2tfTa0bo Your problem sounds like a broken crank where something is obstructing it from turning over and it isn't something small or it would fall into the bottom end.

[@ericace3744]

so what should i do ,to try to remove if something is obstructing

[@ericace3744]

so i need to the same as top end video

[@sledracer92]

Did you see how he was loosening the head bolts go in a pattern I'm a mechanic I seen this go wrong

[@sledracer92]

And when you do a rebuild you replace both pistons and rings at the same time to do it right

[@Paisteboy]

Brandon Sampson We did replace both pistons, twice. It blew up again when he ran it out of oil. We did a second rebuild in HD last year. What could go wrong loosening the head bolts out of pattern? Thanks for the comments.

[@sledracer92]

Could warp the aluminum

[@sledracer92]

Just trying to help ya out I see this everyday

[@AffordableHeating]

Good videos buddy! I let the wife watch the garbage on TV and I prefer to watch videos like this, keep it up bro, in the middle of redoing the top end of my 99 700cc triple right now. Things are going pretty smooth, just all the wait game to get in the parts...lol.

[@tylerheard1279]

Always be sure to chamfer the ports properly! If not, rings hang and start a chain reaction causing failures. Not saying that's the cause here, but if someone rebuilt it.......could be.

[@Dailystrokesforyoufolks]

the lose plug and the carb boots being lose is exactly what blew that engine that cylnder would have been running massively lean fyi

[@Paisteboy]

That would do it but we're pretty sure it was the c-clip from the wrist pin that came loose.

[@gruhland]

Thanks for the info...I'll have to check out Sony Vegas for editing....

[@travisracen]

I love working on this age sled so much easier than my 08 haha

[@Paisteboy]

@hyde20082142 They are R.A.V.E valves.

[@oldtimerf7602]

Might should have drained the coolant FIRST before doing anything else.. antifreeze in the crankcase is BAD juju..

[@Paisteboy]

Yes. We should have.

[@YoGuy121]

atleast you didnt blow the motor atleast its fixable good luck dud

[@YoGuy121]

atleast you didnt blow the motor atleast its fixable good luck dude im sorry i meant dude

[@Paisteboy]

I was lifting my seld and ruptured my bicep tendon. I made a video right after it happened talking about it called "Paisteboy's snowmobile season is over". You can see it at kzbin.info/www/bejne/n3zYY5mmfMmWkNU

[@GCPM001]

the guy from powermods blew his jug on he's polaris iqr because the carb boots where lose man

[@Paisteboy]

Dan Theriault Yeah. That was not the case here. Thanks for watching.

[@alexfarrar5389]

Should have drained the coolant system before disassembling the top end. Coolant isn't good got the crank bearings there's a reason you guys have blown cylinders and. Obviously rookies.😂

[@Paisteboy]

Yes. You are right. We've learned from our mistakes. Thanks for watching.

[@gangsterbryce]

get a polaris ultra triple 1996

[@guyproulx1660]

people who ride BOMBardier become good mechanics lol

[@guyproulx1660]

nativeman9111 Arctic Cat is unreliable, i've owned many sleds in my lifetime and most were high performance 600, 700 and 800cc and the most reliable to me was my SRX 700 triple and was also the fastest sled i've owned on top end speed, all my sleds were stock

[@Paisteboy]

It really depends on a lot of things whether a sled is reliable or not. First off, was it a first-year model motor or chassis that hadn't been tested enough? Was there an issue with a motor that took years to realize was a chronic problem? How one maintains their sled is huge too. I haven't had huge problems with any sled that I've owned and I've owned all but Polaris. My old ski doo had zero problems and now I have a brand new one working perfect. My old Yamaha back in the day only gave me one issue and it was right before the season started. Possibly due to my failure to do a good summerizing. Old Artic Cats gave me and my friends the most problems, but I haven't owned one is modern times. I'm sure they are better now. Everyone has a horror story about a sled. This rebuild was not the fault of the motor but the mechanic that worked on it last. The next rebuild on this sled was due to running out of oil. This is my brothers sled not mine. lol.