• 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 4st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

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Different Head Gasket Thicknesses, Your Experience

OlderHuskyRider

OlderHuskyRider

Husqvarna
Pro Class
For the 450 and 510, there are 3 different thicknesses of head gaskets, am I correct in that?

If thickness is the difference, has anyone used the thickest one to lessen compression a little?

Which one comes standard on the 2008-2010 450, 510?

8E00 A4195 (1,0 mm) (450-510) Gasket (1,0 mm) (450-510)

8B00 A4195 (1,1 mm) (450-510) Gasket (1,1 mm) (450-510)

8H00 A4195 (1,2 mm) (450-510) Gasket (1,2 mm) (450-510)
 
1.1 is standard, the 1.2 will mellow your motor slightly and require less octane. I know some guys that pulled the motor just to put the 1.2 in the 2004 TC 450, they thought it helped.
 
There is a measuring process outlined in the x-light repair manual. That requires spacers and a torque down of the head.
 
In the 2009 manual I have, I see where the different head gasket thicknesses are used to make the combustion chamber uniform, depending on the variances of the piston/rod height. I don't see anything about any spacers. Also, I guess they are always assuming a new base gasket, uncrushed, is installed for this measuring procedure.

I would think that not every motor that came off the assembly line would be fitted with the 1.1mm gasket, they probably use the different thicknesses at the factory to make the combustion chambers uniform.

Thanks for you guys' input.

HuskyHeadGasket.jpg
 
I bet every one has a 1.1 or even 1.2 from the factory.

I doubt they put spacers and torque the cylinder down to measure it.

You have to get 40 NM on the cylinder to check it correctly and that requires spacers or shorter head bolts to do.


Don't mess around with the thin gasket. A friend here on CH bent his valves on a rebuild when a new Piston when in with the thin gasket and the valves hit the piston crown.
 
Not in my experience... But MOTORHEAD did it to his 08TE510 in 2009, not sure how many others have done it...

MOTORHEAD said:
I'm running two base gaskets and the thickest head gasket right now. I have not posted this work in another thread.

I removed the fitting and installed a screw coated in THREEBOND 1211.
Click to expand...

MOTORHEAD said:
Yes, I like the bike much better now. The motor is WAY smoother and easier to ride. I'm not a big fan of really high compression engines anyway. IMO, anything above about 12:1 starts to give diminishing returns, via very jerky power below about 4 grand and possible lose of torque from "deto" on pump gas. Adding FWW and running race gas will help, but then you start to slow revs again and add to opertating costs / complexity, which just seems to be shooting yourself in the foot, to me anyway.

It might all be justifiable for PRO level MX or SM, but not for what I want it to do.

Pulling the top end down isn't that nasty of a job, you don't have to break the cam chain and I didn't remove the valves or even have to re-shim. Just put it back together and set the cam timing, which isn't as hard as it sounds.

Besides, IMO, the rewards are worth it.
Click to expand...
 
Awesome info guys, I'm sold, I ordered the 1.2mm head gasket, 2 base gaskets, when I tear down the head and cylinder to check my wear and clean the carbon from the comb chamber, I will be going back with 2 base and the thick head gasket.
 
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