[svtjames]

What would cause oil to be overflowing into the intake boot via whare the crankcase breather tube plugs into it. There isn't too much oil in the ltr so that can't be it.



In the meanwhile I did a temp. fix that will probably wind up being permenant to prevent it happening again. Check it out.

 

[svtjames]

Anybody got any ideas why it's doing that?

 

[SandJunkie]

Thats a wierd one...I dunno...too much oil?...I have 200ml above the recommended amount and mine seems to be running just fine...the only other thing I can think of is that the return breather line off the bottom of the oil return tank might be clogged and your getting excessive pressure building in that return tank. Have you rolled that thing or gotten sideways severely?
The only other thing I would do is pull the line off the bottom of the return tank...the one that feeds back into the crankcase?...and drain the tank to see if anything comes out...see if it happens again

 

[YFZ450 Blaster Racer]

Thats a wierd problem Sorry if i can't say anything to help but what Junkie said could be what is happening. Also did u leave your LTR sitting straight up for awhile?

 

[BCGIrish]

I didn't have a clue so I was trying not to derail the post, sorry dude.

 

[svtjames]

I do a pretty good job of keeping it on all fours so io don't belive it's anything i could've done. I'm waiting on some royal purple to come in then i'll try what you said junkie. I'm just glad I got the trinity intake cause i'm not sure if it would have been noticalbe with the stock setup. Thanks

 

[SandJunkie]

Sorry I couldn't be more help bro...

 

[svtjames]

Alright yesterday I was messing around with it. I started it up and let it idle for about 3-5 min. Then I pulled the hoses off the oil return tank and nothing came out. This struck me as odd because the box has to be full before oil could come out of the crankcase breather hose. Should I have ran it longer? Maybe it didn't build up enough pressure. Another question I have is do you guys replace the o-ring for the oil filter and cover every time you change it? I haven't so I was thinking maybe one of those are bad and it could be sucking air in creating an air pocket forcing the oil out the crankcase breather hose like an overflow?? Make sense?

 

[SandJunkie]

I dunno James...I think if that thing could suck air then it could also leak oil...there should be oil sign. I change my "O" ring after every other oil change...also the service manual says to make sure the arrow on the oil filter cover points to the rear of the bike...I don't know what it matter but thats what it says in the service manual...

 

[PokrMny]

Junkie, where are you getting the replacement O-ring at. I've changed my oil a few times and haven't changed it. I don't have any leaks but it does sound like a good idea. And does anyone know what the deal is with the arrow on the cover, I would like to hear that one explanied.

Sorry for the Hijack

 

[Clone]

James, we have had issues with this before on big bore motors. They create more crankcase pressure because of the increased size of piston. Naturally, we build them so the rev faster too and that creates a lot of pressure too quickly for the stock black box stock size including hoses and fitting. It is basically just a "holding tank" for the oil to go when relieving crankcase pressure. Sometimes a lot of crankcase pressure indicates leaking rings. You didn't replicate your oil issues just leaving it idling like you did. If you go out and hammer on it for awhile, then you should see the same things.

I always seem to have small puddle of oil at the bottom of intake boot right at the filter on the LTR, but not enough to reach the filter. Are you getting very much oil?

 

[SandJunkie]

Pokr...I'm buying my seals from Chaparrell here in Riverside...I just walked up to the counter and asked...they had them there...I think they might be the same as a 400?...as far as the arrow?...I dunno that one either...just what the manual says....

"Junkie only pawn in game of life"

 

[PokrMny]

Thanks, I'll look in to that.

 

[svtjames]

99.9% sure i found out what my problem is. Maybe three months ago when I was cleaning my air filter i noticed some dirt in the intake boot. Took the boot off cleaned it out and when I ws putting it back on I noticed a rip where the crankcase breather tube plugs into it. So I ordered a new one, no big deal, put it on a week later when it came in. Then after riding a couple times went to clean the fliter and started noticeing the oil in the intake boot. After reading what clone said "may be a sign of leaking rings". It got me thinking about when the intake boot got ripped. Wasn't sure if it happened when I was cleaning it or if it happened when I installed it originally. Hell that was my first mod besides the cherrybomb. So after a lot of research on this topic I decided to take the motor apart to see if my problem was in the rings. Turns out there was a decent chunck of the nikasil missing at the top of the cylinder on the exaust side. The top compression ring was shattered about 1/4 inch on each side of where the gap is. Luckily the peices were all still in the ring grove. Also the ring grove where the nikasil was missing was warped a little. Got the pics below.

Can move to Problem Sloved Forum now or i'll repost after I get my cylinder re-nikasiled and drop-in the new piston to make sure it's fixed!

 

[onesavage]

wow that sucks... all from a little dirt?

 

[MXQuadRacer]

After reading what clone said "may be a sign of leaking rings". It got me thinking about when the intake boot got ripped. Wasn't sure if it happened when I was cleaning it or if it happened when I installed it originally. Hell that was my first mod besides the cherrybomb. So after a lot of research on this topic I decided to take the motor apart to see if my problem was in the rings. Turns out there was a decent chunck of the nikasil missing at the top of the cylinder on the exaust side. The top compression ring was shattered about 1/8 inch on each side of where the gap is. Luckily the peices were all still in the ring grove. Also the ring grove where the nikasil was missing was warped a little.
Can move to Problem Sloved Forum now or i'll repost after I get my cylinder re-nikasiled and drop-in the new piston to make sure it's fixed!
[/b]

Uggh, glad you caught that before the problem got any worse!

I'm going to move this to the problem solved forum for now, but leave it open to posting for a bit...we can edit/clean things up when you have finalized pictures to make everything flow right.

 

[svtjames]

Finally no more oil flowing into my Airbox!! I sent the cylinder to max-power to get it replated, and installed a 13.75:1 cp piston. Broke my 7 month old quad in again this weekend. Runs like a champ. Big increase in power in the lower rpms. Powering out of tight corners is where I noticed it most. Does pull a little better than it did before when drag racing a couple of my friends also. Here's a pic of the new piston, it's a lot lighter than the stock one too.

Problem Solved!!

 

[kidsdad0101]

Finally no more oil flowing into my Airbox!! I sent the cylinder to max-power to get it replated, and installed a 13.75:1 cp piston. Broke my 7 month old quad in again this weekend. Runs like a champ. Big increase in power in the lower rpms. Powering out of tight corners is where I noticed it most. Does pull a little better than it did before when drag racing a couple of my friends also. Here's a pic of the new piston, it's a lot lighter than the stock one too.

Problem Solved!!
[/b]

Daaayaaamn. Looking good man

 

[quadracer3]

well i am in the same boat you were.what kind of piston did you use,and how do you like it

 

[svtjames]

CP 13.75 piston and I think I felt a bigger increase in power on the butt dyno than when I got the exhaust. Very noticable down low when powering out of corners.