cylinder base gasket leak
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cylinder base gasket leak
Doing a leakdown test after throwing the top end back on and I found a tiny leak at the base gasket just below the reeds/intake. When using soapy water to visualize the leak, It’s a small enough leak where it creates more of a foam/fizz rather than big bubbles like you would see with a bigger leak It’s to the right of where the cases mate. I don’t believe it’s the case mating area as it’s perfectly seamless with my finger there. I was wondering how to get around this. I ordered another new gasket so I’m not gonna be riding the 220 this weekend like I planned. What can I do to insure this will not leak next time around.
2005 KDX220r 1991 KDX200 2022 KTM 500excf
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Re: cylinder base gasket leak
I always put a really thin layer of grease on both sides of my gaskets to help them seal and make future removal easier. Make sure when you install the new one is tighten the cylinder down evenly, nut to nut, as you go to help insure a good seal. If for some reason that doesn't work ten there is an issue with one of the surfaces and you need to figure out what it is.
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AZ State Parks & Trails OHV Ambassador - Trail Riders of Southern AZ
Current KDX: '98 KDX220
Old KDX: '90 KDX200 -White/Blue
'11 GasGas EC250R
AZ State Parks & Trails OHV Ambassador - Trail Riders of Southern AZ
Current KDX: '98 KDX220
Old KDX: '90 KDX200 -White/Blue
'11 GasGas EC250R
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Re: cylinder base gasket leak
Nothing wrong with putting a very thin layer of gasket maker on each side of the gasket before you put it in.
Loctite RTV comes to mind.
Loctite RTV comes to mind.
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Re: cylinder base gasket leak
Avoid any sealant that is silicone based as it does not play well with gasoline.
Youtube Channel: WildAzzRacing
AZ State Parks & Trails OHV Ambassador - Trail Riders of Southern AZ
Current KDX: '98 KDX220
Old KDX: '90 KDX200 -White/Blue
'11 GasGas EC250R
AZ State Parks & Trails OHV Ambassador - Trail Riders of Southern AZ
Current KDX: '98 KDX220
Old KDX: '90 KDX200 -White/Blue
'11 GasGas EC250R
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Re: cylinder base gasket leak
Good point, and most of them are acidic and will eat aluminium. I've seen a KTM clutch cover trashed because the owner bonded a plastic guard on with a normal silicon sealer. The silicon leached acid and ate the clutch cover.
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Re: cylinder base gasket leak
Will threebond 1211 be safe? I did torque as evenly as I could with a torque wrench in 4 stages. Thanks
2005 KDX220r 1991 KDX200 2022 KTM 500excf
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Re: cylinder base gasket leak
hylomar works the best use on everything except head gaskets
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Re: cylinder base gasket leak
Product spec says yes
https://threebond-europe.com/products/tb1211/
".........to prevent oil, water, gasoline and chemical leaks"
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Re: cylinder base gasket leak
Thank you for thatjakeslouw wrote: ↑08:26 am Sep 01 2023Product spec says yes
https://threebond-europe.com/products/tb1211/
".........to prevent oil, water, gasoline and chemical leaks"
2005 KDX220r 1991 KDX200 2022 KTM 500excf
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Re: cylinder base gasket leak
threebond 1211 is all i use these days,its basically gold standard for sealants, can even be used for head gaskets which i have done many times, threebond 1104 is also an option but its really difficult to remove, rtv shouldn't be used , one issue with base gasket installation is the studs tend to build up corrosion at the base of the stud, this needs to be removed then run a bottle brush through the stud holes on the cylinder to avoid any loose flakes' landing on the base gasket during installation
1999 KDX220SR (KDX220-B5)
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Re: cylinder base gasket leak
While I didn’t go that the extra mile to get rid of the corrosion on the studs, I did get a new base gasket install with the threebond on the problem area plus a very light coat everywhere else. Hoping it doesn’t show up on a leak test any more. If not the bike will be together tomorrow. Thankskdxdazz wrote: ↑03:06 pm Sep 02 2023 threebond 1211 is all i use these days,its basically gold standard for sealants, can even be used for head gaskets which i have done many times, threebond 1104 is also an option but its really difficult to remove, rtv shouldn't be used , one issue with base gasket installation is the studs tend to build up corrosion at the base of the stud, this needs to be removed then run a bottle brush through the stud holes on the cylinder to avoid any loose flakes' landing on the base gasket during installation
2005 KDX220r 1991 KDX200 2022 KTM 500excf
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Re: cylinder base gasket leak
Hmmm you might be onto something. I've watched so many How To vids I'm not sure if this was for the KDX, but I seem to recall some guy had crankcase gas going past the threads at the bottom of one of the studs?kdxdazz wrote: ↑03:06 pm Sep 02 2023 threebond 1211 is all i use these days,its basically gold standard for sealants, can even be used for head gaskets which i have done many times, threebond 1104 is also an option but its really difficult to remove, rtv shouldn't be used , one issue with base gasket installation is the studs tend to build up corrosion at the base of the stud, this needs to be removed then run a bottle brush through the stud holes on the cylinder to avoid any loose flakes' landing on the base gasket during installation
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Re: cylinder base gasket leak
First ride tomorrow. The threebond seemed to work I could not detect any bubbles in that area. If there still is then it was an insanely tiny leak. Hoping all goes well this time around.
2005 KDX220r 1991 KDX200 2022 KTM 500excf
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Re: cylinder base gasket leak
LET THIS MAN RIDE!! :-)
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