Gasket change

[CG Sam]

Hi, probably a bit of a noobish question, but my head gasket has been blowing and I'm going to change it tomorrow. My question is do you need to use a gasket sealant when you put a new head gasket on or do you just remove the old one and replace and reassemble?

Thanks,

Sam.
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CG125, SV650S, CBR600F, GSXR600 SRAD

[Nemo]

Take it off, clean both surfaces, put new one on, bish bash bosh.
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Previously owned: Kawasaki KH125, Suzuki GP125, Suzuki GX 125, Honda CB125 TDC '83, Honda ntv 600, Kawasaki ER5, Kawasaki ZZR600, Aprilia RSV 1000 Mille
Now own: Ducati 848 evo

[CG Sam]

Cheers, so need for any sealant?

Thanks,

Sam
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CG125, SV650S, CBR600F, GSXR600 SRAD

[MattWadz]

depends on the type of gasket i think?

but ive never used any sealant as it can block up oil/water galleries, but i dont think youl have many of those in a CG125 head.


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Pitbike x2, Mini Moto x4, China Quad, 02' Suzuki AP50 > 03' MBK Nitro > 86' Suzuki GP100 > 02' Yamaha Jog R > 57' Honda Lead 100 > 95' Piaggio ZIP Rst 50 > 51' Suzuki TS50x > 83' Honda CB125TDE Twin > 51' Yamaha Aerox > 98' Kawasaki KX60 > 89' Yamaha DT50MX > 80's Honda QR50 > 05' CG clone > 125cc China Pitbike > 91' Honda MTX125 RW-L > 09' Peugeot Speedfight 2 LC LR > Lucky MX 140cc > Apache Tomahawk 50 Quad (current = 2010 Yamaha WR125R

[69chris]

i only ever use a thin smear of grease on any gasket, unless the mating surfaces are really rough you shoudnt need owt else

[Vincent]

Spend a bit of time cleaning both surfaces - making sure you don't scratch or gouge them, finish off with some fine abrasive, and, as long as there's nothing wrong with either......and you torque them together properly......you should be ok. Try and establish why the gasket blew - look for signs of damage on it before removing and stick to an OEM replacement. Happy gasketing
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Space Is Deep

[stinkwheel]

Most modern gaskets already have a thin coating of sealant.

Looking at the pictures, a CG125 head gasket is a coated fibre gasket with sealant already on it and a built-in, steel fire-ring.

https://cdn3.fast-serve.net/cdn/BrooksBarn/CG125-CYLINDER-HEAD-GASKET_700_600_3T9VE.jpg

This adds up to you wanting clean, smooth and de-greased mating surfaces. At most a TINY smear of grease on the fire-ring
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[CG Sam]

Cheers for all the replies, change went smoothly and quite enjoyed doing the work myself.

Not sure what caused the problem but the metal ring was warped on it. Will see how it goes with the replacement part and research what caused it.

Thanks again for the advice,

Sam.
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CG125, SV650S, CBR600F, GSXR600 SRAD