Leakdown test good/running bad
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- Supporting Member II
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Leakdown test good/running bad
I pulled my 220 engine out today because of the headgasket issues and the excessive smoking issues I wasn’t able to resolve. I decided to pressure test it and after 20 minutes at 5 psi I only lost 1/2 psi.
2005 KDX220r 1991 KDX200 2022 KTM 500excf
- Chuck78
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Re: Leakdown test good/running bad
I'm still baffled as to all the difficulty you had getting your head gasket to seal. Were you using OEM head gaskets? The only thing I can think is that perhaps your head still was not flat enough. Are you using the proper torque sequence? What grit did you use to finish the head gasket surface? And did you do the same for the cylinder or was that professionally done? Was that double checked? I would put a machinist's straight edge across the cylinder particularly around these studs, and make sure it is not raised anywhere. Are you using proper torquing sequence when installing? Was this installed dry, or did you use copper coat head gasket sealant or similar?
At any rate, the 200 cylinder should get you back in the running. I wonder if the head was just milled too thin or if something was wrong with the casting? Had you tried multiple heads?
At any rate, the 200 cylinder should get you back in the running. I wonder if the head was just milled too thin or if something was wrong with the casting? Had you tried multiple heads?
'97 KDX220R - purple/green! - KLX forks, Lectron, FMF, Tubliss
'99 KDX220R project - '98/'01 RM125 suspension, Titanium hardware, Lectron Billetron Pro, Tubliss
'77 Suzuki PE250 & '83 Suzuki PE175 Full Floater - restomod projects
'77 Suzuki GS750-844cc, '77 GS400/489cc & '77 GS550/740cc projects
'62 GMC 1000 Panel Truck
'88 Suzuki Samurai TDI/Toyota swaps
'88 Toyota 4x4 pickup
'99 KDX220R project - '98/'01 RM125 suspension, Titanium hardware, Lectron Billetron Pro, Tubliss
'77 Suzuki PE250 & '83 Suzuki PE175 Full Floater - restomod projects
'77 Suzuki GS750-844cc, '77 GS400/489cc & '77 GS550/740cc projects
'62 GMC 1000 Panel Truck
'88 Suzuki Samurai TDI/Toyota swaps
'88 Toyota 4x4 pickup
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- Supporting Member II
- Posts: 570
- Joined: 12:36 pm Mar 28 2021
- Country: United States
Re: Leakdown test good/running bad
Yea that was a pain in the butt. I noticed it after the winter (during winter I took the head off to check things). Then I went through 4 head gaskets, 3 of them were moose racing brand and one head oem head gasket. I lapped the rb head and the stock 220 head and it got better but never sealed up completely. I then moved on to another cylinder as the porting wasn’t working well on my cylinder. Same issues followed. Weird.Chuck78 wrote: ↑12:39 pm Nov 09 2023 I'm still baffled as to all the difficulty you had getting your head gasket to seal. Were you using OEM head gaskets? The only thing I can think is that perhaps your head still was not flat enough. Are you using the proper torque sequence? What grit did you use to finish the head gasket surface? And did you do the same for the cylinder or was that professionally done? Was that double checked? I would put a machinist's straight edge across the cylinder particularly around these studs, and make sure it is not raised anywhere. Are you using proper torquing sequence when installing? Was this installed dry, or did you use copper coat head gasket sealant or similar?
At any rate, the 200 cylinder should get you back in the running. I wonder if the head was just milled too thin or if something was wrong with the casting? Had you tried multiple heads?
2005 KDX220r 1991 KDX200 2022 KTM 500excf