YFsiezed? -- Teardown Report

Livingmylife93 · July 06, 2009, 09:46:15 PM

My friend was riding his yfz at the track, 3rd ride since a new rebuild. I wouldnt say it had a very good break in. Riding on the track it stuttered twice then cut off and locked up. The starter wouldnt turn the motor at all, so we start to push start and drag start it and what not. Tires wouldnt spin at all, no matter what gear. Motor wouldnt turn in neutral either. There was plenty of oil in it.

Its been sitting at my house since it happened for me to fix, after 3 weeks of sitting up on the grab bar in my garage for storage reasons, i took it down today cause i plan on working on it tommorrow. I was curious, put the key in and hit the starter. Now the motor is turning but not fast enough to get it started. Tires still wont turn on a push start though. I put it on the battery charger for a while but still, the motor would turn about 2 or 3 strokes, then starter would stop. Take my finger off and do it again, same thing.

Also, kind of heard a noise today when trying to electric start it, kinda like the plug wasnt in, but it is.

WTF?

Im thinking:
Cam hopped out of tracks, jamming motor?
Decompression valve no worky?

Hefe · July 07, 2009, 09:07:49 AM

I bet the trans gears are all f'd up
otherwise it would turn over with a yank

Livingmylife93 · July 07, 2009, 01:01:07 PM

unclesharty · July 07, 2009, 09:55:27 PM

Time to start tearin into it. Take the cam cover off and inspect the cam, spockets, and timing. If they look good. Keep digging.

Alkire193 · July 08, 2009, 01:54:34 AM

My wheels siezed last Sunday and wouldnt turn at all. It was because I broke 4th in half. (neutral also would not allow my tires to spin) Stop trying to start it and pop it, whatever is broke might be doing more damage if you keep trying to run the motor. And get ready, youre tearing your engine down!

TechQuadShop.com has a great full rebuild gasket kit for $81.00 and I got some spare parts for a tranny if you need them. Just let me know.

If you dont have special tools like a case splitter/separator (if it comes to that), case puller, or flywheel puller. Nows the time to visit RockyMountainAtv.com. The Tusk tools I got from them work great! Some of the guys have their own methods that are cheaper but these tools helped me out.

I also posted in a thread called "game time" under 700 raptor maint if you want to see what kind of damage running the motor will do to the case once the gear is broke

Livingmylife93 · July 08, 2009, 08:37:37 PM

Had it running for 2 minutes, started hard, wouldnt idle, then locked again. So i tore down.

Main bearing is seized. The one that connect the piston rod to the .. crankshaft?

So im gonna have to split the case and stuff. Start helping me lol, give me hints and tips lol. Never gone below the top end before, other then for a clutch job.

Alkire193 · July 08, 2009, 10:00:25 PM

The post I did for game time has a lot of pictures and advice.
http://www.raptorsource.com/forum/index.php?topic=4936.0
Also, Gunz gave me a link to a free 700 Raptor manual
http://www.raptorsource.com/forum/index.php?topic=524.0
Get the password and username in "Off Topic"

Get a gasket set from TechQuadShop.com and you will probably need special tools like the Crankcase splitter, crankcase puller, and if youre removing the crank the flywheel puller to pull the magnetic stator wheel (thats what I call it). Once youre inside grab the parts off an OEM website that you need and go to town.

And most import, every single thing you take off! Keep it organized, theres all kinds of keys and washers and little parts and gears. Ive got it all in bags and im still not sure where it all goes.

I know ive wrote most of this before, but all that plus some large metric/SAE sockets and some fluids and youre good to go.

I also rachet strapped the engine to my work bench to break some of the torques. Even had to stand on a cheater bar for one of them. But make sure you snag a torque wrench from autozone because everything inside has a torque ( mostly ft/lbs torques)

Its no sweat, I was swearing some but it was fun, especially splitting the case!

Hefe · July 09, 2009, 08:28:49 AM

you willl need a big torque wrench and a small one too
big one for the head bolts and a small one for the cam caps (only 7 ft lbs, or 10nm)
take your time, take a ton of pics (for us and for reference)

Livingmylife93 · July 09, 2009, 09:59:19 AM

Quote from: Hefe on July 09, 2009, 08:28:49 AM
you willl need a big torque wrench and a small one too
big one for the head bolts and a small one for the cam caps (only 7 ft lbs, or 10nm)
take your time, take a ton of pics (for us and for reference)

Will do

unclesharty · July 09, 2009, 10:59:37 PM

Quote from: Livingmylife93 on July 08, 2009, 08:37:37 PM
Had it running for 2 minutes, started hard, wouldnt idle, then locked again. So i tore down.

Main bearing is seized. The one that connect the piston rod to the .. crankshaft?

So im gonna have to split the case and stuff. Start helping me lol, give me hints and tips lol. Never gone below the top end before, other then for a clutch job.

Bearing that connects rod to crank = rod bearing.

Bearings that crankshaft spins on = main bearings.

Dont try to do this without a service manual. You wont remember where/how everything goes. The pictures in manuals are helpful to make sure your not missing little spacers, washers, ect...

Livingmylife93 · July 10, 2009, 08:52:59 AM

Service manual isnt really an option... We are just going to take alot of pictures, and look at alot of exploded view pictures....

Thanks for clearing that up uncle, the rod bearing is the one im talking about.

kyledvor61 · July 13, 2009, 03:00:02 AM

typical problem of 04-06 yfz's. do the oil mod or get an 07 oil squirter while your in there

Hefe · July 13, 2009, 09:13:36 AM

Quote from: Livingmylife93 on July 10, 2009, 08:52:59 AM
Service manual isnt really an option... We are just going to take alot of pictures, and look at alot of exploded view pictures....

Thanks for clearing that up uncle, the rod bearing is the one im talking about.

why is it not an option?
just download it..
http://www.maxmekker.com/atv.asp

I really would not try to do this with out the torque specs and such right next to me

Livingmylife93 · July 14, 2009, 07:04:33 PM

Quote from: kyledvor61 on July 13, 2009, 03:00:02 AM
typical problem of 04-06 yfz's. do the oil mod or get an 07 oil squirter while your in there

Its a 2007 yfz...

Quote from: Hefe on July 13, 2009, 09:13:36 AM
Quote from: Livingmylife93 on July 10, 2009, 08:52:59 AM
Service manual isnt really an option... We are just going to take alot of pictures, and look at alot of exploded view pictures....

Thanks for clearing that up uncle, the rod bearing is the one im talking about.
why is it not an option?
just download it..
http://www.maxmekker.com/atv.asp

I really would not try to do this with out the torque specs and such right next to me

Alright cool, thanks for the link

kyledvor61 · July 19, 2009, 10:46:08 PM

Quote from: Livingmylife93 on July 14, 2009, 07:04:33 PM
Quote from: kyledvor61 on July 13, 2009, 03:00:02 AM
typical problem of 04-06 yfz's. do the oil mod or get an 07 oil squirter while your in there

Its a 2007 yfz...

Quote from: Hefe on July 13, 2009, 09:13:36 AM
Quote from: Livingmylife93 on July 10, 2009, 08:52:59 AM
Service manual isnt really an option... We are just going to take alot of pictures, and look at alot of exploded view pictures....

Thanks for clearing that up uncle, the rod bearing is the one im talking about.
why is it not an option?
just download it..
http://www.maxmekker.com/atv.asp

I really would not try to do this with out the torque specs and such right next to me

Alright cool, thanks for the link

its an 07?

never heard of it for the 07+

RaptorSource.com

News:

YFsiezed? -- Teardown Report

Livingmylife93

Hefe

Livingmylife93

unclesharty

Alkire193

Livingmylife93

Alkire193

Hefe

Livingmylife93

unclesharty

Livingmylife93

kyledvor61

Hefe

Livingmylife93

kyledvor61