Z1OwnersClub GB

Hi,recently had top-end engine rebuilt using cometic 1174 big bore head gasket which leaks.Is there a better make of head gasket out there that’ll prevent same happening again

I have an A2 with 1170 Wisconsin pistons and is leaking 500ml / 300 miles. I’m trying to get a gasket but due to so many unknowns ( exact bore, dowel size and shape etc. ) I need to take off the head to have a look. I’m looking at a MLS gasket which may be reusable ( not guaranteed. If you’re having a leak, you will struggle to cure it but if you replace the gasket check the nuts aren’t bottomed out. You may need ape nuts or put washers under them. I will try put a link to a supplier when the wine passes through my liver! Bye for now!

The CFM fibre gaskets for the J motors became shite about 7 or 8 years ago. Dont know if they changed the compound / supplier but i had endless problems with them leaking and tried absolutely everything to stop that. You can torque a new one to 29 lbs/ft but now its leaking it wont help.
The MLS gaskets are effectively piano wired in the gasket and using standard torque, you do them up and thats that. No need to re-torque as they dont compress but they do bite in to the alloy.
As Phil says they may be re-useable but i dont know as i havnt needed to.
I dont personally recommend the 'New' cometic cam cover gaskets. They are composite with a woven middle. They are rubber coated and are one performance only. When you take the cam cover off to check shim gaps after xxx miles you need a new cam cover gasket as the rubber coating gets left behind. They are also sharper than a box cutter knife on the edge so working on the head end is hazardous to say the least.

Here's an 1170 version MLS at 75mm / 76mm but dont know if they do them for standard bore at 1100cc and 72.5mm,.. you could speak with them.
https://www.suzukiperformancespares.co. ... sket/5068/

AL

Here is another link. http://www.performanceunlimited.co.uk
These people seem very helpful, but I still need to lift the head to make sure I get the correct gasket. Also I don't know the full history of my bike. don't know how much if any was taken off the head etc. so I need to check if the cyl hd nuts are bottomed out as torque seems fine. While I have the head off I will also check valve clearance and the like, so I not looking forward to that, as any close inspection of an old bike usually results in the credit card taking a battering!
Good Luck with it!