Register Community Calendar Today's Posts Search

Go Back   GZ 250 Forums > GZ250-Specific > Troubleshooting

Reply
 
Thread Tools Display Modes
Old 10-15-2008, 11:17 AM   #11
Quimrider
Senior Member
 
Join Date: Jun 2007
Location: Toledo, OH
Posts: 198
Send a message via AIM to Quimrider
Re: Head gasket replacement?

Ok so maybe I exaggerated a bit I do about 2/3 highway 1/3 city. 95% of my riding is 45mph + However, unless the wind is at my back 65-70mph is usually WOT with the taller 16t sprocket. Which of course isn't quite as hard on the engine as WOT at 75mph+ with the stock 15t sprocket.

I'm quite perplexed about the leaky valve cover. Maybe the 7ft-lb torque spec in the service manual is wrong? That doesn't seem very tight for a part of the engine that receives quite a bit of vibration. I hope it's not the case but I suppose it's possible my cylinder head is warped. Awe screw it!!! I'll just throw on that big bore kit and be done with it! :lol:



Login or Register to Remove Ads
Quimrider is offline  
Reply With Quote
Old 10-15-2008, 11:28 AM   #12
Easy Rider
Senior Member
 
Join Date: May 2007
Location: Champaign, Illinois
Posts: 4,561
Re: Head gasket replacement?

Quote:
Originally Posted by Quimrider
I'm quite perplexed about the leaky valve cover. Maybe the 7ft-lb torque spec in the service manual is wrong?
No, I don't think so.
Are you sure there isn't supposed to be a "real" gasket there? (I could go look at my service manual but no time right now).

For something like that, like the lug nuts on a car with disc brakes, the sequence of tightening is as important as the torque. First all barely finger tight, then all at about 1/4 tight using a "star" pattern, then 3/4, then full.

Also when using sealer only, both surfaces must be squeeky clean (brake cleaner is good) and sufficient cure time must be allowed.......I'm guessing 24 hours.

If all else fails, I think I'd be getting a new cover......on the off chance that yours warps in a funny way when it gets hot.
__________________
Loud pipes risk rights!
Easy Rider is offline  
Reply With Quote
Old 10-15-2008, 02:55 PM   #13
patrick_777
Senior Member
 
Join Date: May 2008
Location: Tulsa, OK
Posts: 1,763
Send a message via ICQ to patrick_777 Send a message via AIM to patrick_777 Send a message via Yahoo to patrick_777
Re: Head gasket replacement?

You guys are making me want to tear apart my engine.
__________________
]I am hiding in Honduras. I am a desperate man. Send lawyers, guns and money. The shit has hit the fan.



Login or Register to Remove Ads
patrick_777 is offline  
Reply With Quote
Old 10-15-2008, 03:21 PM   #14
Quimrider
Senior Member
 
Join Date: Jun 2007
Location: Toledo, OH
Posts: 198
Send a message via AIM to Quimrider
Re: Head gasket replacement?

see details in this thread if you want to read about the oil leak There isn't a "real" gasket. I was surprised about this and it explained why I couldn't find the part number for a gasket that doesn't exist. The service manual says to use some special Zuki gasket goo. I cleaned it up with gasket remover and then cleaned off the gasket remover with brake cleaner for shiny clean surfaces. The aviation gasket maker I tried only lasted about 3 weeks. The RTV silicone only about 2 weeks. I checked for a warped cover. I hope I'm doing something wrong and don't have a warped cylinder head! At least it's a slow annoying leak and nothing imminently dangerous.

I only finger tightened the screws after applying the RTV silicone and let it cure for 24 hrs before following tightening instructions in the service manual.
Quimrider is offline  
Reply With Quote
Old 10-15-2008, 05:55 PM   #15
mr. softie
Senior Member
 
Join Date: Jun 2008
Location: Bucks Co. PA
Posts: 361
Re: Head gasket replacement?

Funny, but my '99 GZ has paper gaskets under the valve covers. They stay stuck to the engine.

Good luck wrenching on your bike!
__________________
The real money in a gold rush is in supplying liqueur and women to the miners....
May the wind always be at your back and the sun overhead as you make your way down the ever winding, smoothly paved, traffic free road!



Login or Register to Remove Ads
mr. softie is offline  
Reply With Quote
Old 10-16-2008, 12:24 AM   #16
Quimrider
Senior Member
 
Join Date: Jun 2007
Location: Toledo, OH
Posts: 198
Send a message via AIM to Quimrider
Re: Head gasket replacement?

Quote:
Originally Posted by mr. softie
Funny, but my '99 GZ has paper gaskets under the valve covers. They stay stuck to the engine.

Good luck wrenching on your bike!
We're not talking about the access covers to adjust the valves. We're talking about the "valve cover", the top half of the cylinder head. The part that the rocker arms are attached to.
Quimrider is offline  
Reply With Quote
Old 10-16-2008, 01:43 AM   #17
mr. softie
Senior Member
 
Join Date: Jun 2008
Location: Bucks Co. PA
Posts: 361
Re: Head gasket replacement?

:oops:
__________________
The real money in a gold rush is in supplying liqueur and women to the miners....
May the wind always be at your back and the sun overhead as you make your way down the ever winding, smoothly paved, traffic free road!
mr. softie is offline  
Reply With Quote
Old 10-16-2008, 10:50 AM   #18
Easy Rider
Senior Member
 
Join Date: May 2007
Location: Champaign, Illinois
Posts: 4,561
Re: Head gasket replacement?

Quote:
Originally Posted by Quimrider
We're talking about the "valve cover", the top half of the cylinder head. The part that the rocker arms are attached to.
OK, here's part of the problem: The valve cover is NOT the "top half of the cylinder head".

The valve cover attaches to the cylinder head. The cylinder head does not have 2 parts. :biggrin:
__________________
Loud pipes risk rights!
Easy Rider is offline  
Reply With Quote
Old 10-16-2008, 10:44 PM   #19
Quimrider
Senior Member
 
Join Date: Jun 2007
Location: Toledo, OH
Posts: 198
Send a message via AIM to Quimrider
Re: Head gasket replacement?

:rawk: WOOO HOOO problem solved! There is a nut just below and in between the exhaust pipes. I didn't notice this before, it was loose. I snugged it up and all is good. No more pooting! :lol:
Quimrider is offline  
Reply With Quote
Old 10-23-2008, 08:09 PM   #20
theneanderthal
Member
 
theneanderthal's Avatar
 
Join Date: Jul 2008
Location: Ft. Walton Bch Fl
Posts: 43
Send a message via AIM to theneanderthal Send a message via MSN to theneanderthal Send a message via Yahoo to theneanderthal
Re: Head gasket replacement?

Cool!

Fart fixed by tightening the exhaust is way better the a head gasket. I haven't looked
specifically at the GZ but most bikes have have a bronze or similar gasket in this area.

Might be time to replace it.
__________________
"Beer is proof that God loves us and wants us to be happy." B. Franklin
theneanderthal is offline  
Reply With Quote
Reply




Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 01:27 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.