I'm just gonna leave this here
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Re: I'm just gonna leave this here
Whoops forgot picture
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Re: I'm just gonna leave this here
Can't say I'd recommend this to anyone, but it can be done. I'll be making sure the new seal is in as straight as possible and using permatex formabond 3
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Re: I'm just gonna leave this here
Please tell the next potential owner what you did before he buys it.
I hope the glob of silicone does not break off and float around in the engine.
Good luck with it.
I hope the glob of silicone does not break off and float around in the engine.
Good luck with it.
Thank you for participating on kdxrider.net.
To post pictures from a device: viewtopic.php?f=88&t=24128
To post pictures from a device: viewtopic.php?f=88&t=24128
- Slick_Nick
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Re: I'm just gonna leave this here
Isn’t it faster to just split the cases?
The crankcase sees combustion pressure. There is a LOT of force pushing on the backside of that seal, hence the casting to hold it in. It won’t take long for that seal to be pushed out.
There was a machinist on here who did it successfully back in the day, but he had the cases split, and machined removable tabs that could be bolted on to hold the seal in once installed. Without those, I’m afraid you’re pissing straight into the wind here.
The crankcase sees combustion pressure. There is a LOT of force pushing on the backside of that seal, hence the casting to hold it in. It won’t take long for that seal to be pushed out.
There was a machinist on here who did it successfully back in the day, but he had the cases split, and machined removable tabs that could be bolted on to hold the seal in once installed. Without those, I’m afraid you’re pissing straight into the wind here.
'00 KDX 220R
- Kdxfan4130
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Re: I'm just gonna leave this he
Makes one wonder if the new seal will hold during a pressure check/leak down test. 7 lbs for 7 minutes.
Especially when it’s warmed up far away from the truck.
Especially when it’s warmed up far away from the truck.
Restore rather than replace
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Re: I'm just gonna leave this here
Many new bikes have crank seals that can be installed from the outside.
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Re: I'm just gonna leave this here
Interested to see how this plays out.
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: I'm just gonna leave this here
I have a Honda 250r that both crank seals install from the outside and don't use retainers to hold them in. The seals aren't going to blow out of there. I would do a leak down test right away (6psi) before you start putting the engine covers back on to check your work.
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Re: I'm just gonna leave this here
Agree with Lucy. If they had to be pressed in they should hold. Please let us know how it holds up.
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Re: I'm just gonna leave this here
The only thing that actually concerns me is squaring up the seals. Without that solid edge to seat them against you are almost guessing a bit.
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: I'm just gonna leave this here
Great point.
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Re: I'm just gonna leave this here
I measured the retaining lip against the old seal, and it's pretty consistent all the way around. Yes I plan on a pressure test. Most bikes I've worked on had seals on the outside, it shouldn't be a problem once it's in there straight because it is quite a secure way to hold it all tge way around the seal. but I am thinking of ways to hold it in better, maybe some jb weld anchored on the outside for good measure. I think that'll do. Crankcase pressures barely exceed 5psi, but do experience a lot of heat and vibration. Anyway I can't say much about what could be, I'll just have to see. Btw, my bike is in pieces, I'm putting in all new seals everywhere, porting it, painting it, styling it like a 1993, rewinding the aux stator, and making it a dual sport. If you have swingarm decals for a 93, please let me know.
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- bufftester
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Re: I'm just gonna leave this here
Trying to understand why, if you already have the bike in pieces, you wouldn't just split the cases. Gives you a chance to check the crank and bearings as well as the tranny, and not really sure where you saved money at since you really don't need any special tools to split the cases. Don't think you're in danger of blowing out a seal, but I would clean up the edges real well so you don't damage the seal skirt installing it.
- JoKDX220r
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Re: I'm just gonna leave this here
For those who remember, tedh98 already made this kind of conversion in 2015-2016,
https://haroldbawlzangya.com/2015/12/03 ... the-cases/
https://haroldbawlzangya.com/2016/02/01 ... model-392/
https://haroldbawlzangya.com/2015/12/03 ... the-cases/
https://haroldbawlzangya.com/2016/02/01 ... model-392/
- Kdxfan4130
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Re: I'm just gonna leave this here
That kdx main seal is a different design than that Honda 85 atc250r main seal. I would have split the cases, then did that mod if I was going too. The costs associated with a top end seizure would have that seal retainer being used for sure.
How often do you need to replace the main seal to necessitate this mod?
How often do you need to replace the main seal to necessitate this mod?
Restore rather than replace
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Re: I'm just gonna leave this here
...while keeping the old main bearings.
lizard, no need to worry about us hating it / you saving money. You are the one who bought it and will be riding it. I think there are just a few of us that would have split the cases and done it "the right way".
Good luck on the engine as well as the sticker hunt.
lizard, no need to worry about us hating it / you saving money. You are the one who bought it and will be riding it. I think there are just a few of us that would have split the cases and done it "the right way".
Good luck on the engine as well as the sticker hunt.
Thank you for participating on kdxrider.net.
To post pictures from a device: viewtopic.php?f=88&t=24128
To post pictures from a device: viewtopic.php?f=88&t=24128
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Re: I'm just gonna leave this here
Update on my build, in case anyone is interested. Ill slowly be putting up pictures so anyone can see the build. I regret what I did to the case, and instead wish I would have invested in a case splitting tools, because I have other projects that require them. Anyhow its not a big deal, crank seal is in, and I have no worries whatsoever about it.
Got the kips valves back together and timed, and the motor is now Almost complete.
Up next is the Frame, sanded ready to paint, swingarm, brakes, refurbishing the plastics, rewinding the stator and wiring for road legal use
I never thought I would, but I may consider selling the whole thing because I sustained an injury to my wrist, which now developed a nasty arthritis. I might not be able to ride a motorcycle at all, or i may just ride through the pain. I don’t know yet, but ill be seeing some great doctors. Who knows!
Got the kips valves back together and timed, and the motor is now Almost complete.
Up next is the Frame, sanded ready to paint, swingarm, brakes, refurbishing the plastics, rewinding the stator and wiring for road legal use
I never thought I would, but I may consider selling the whole thing because I sustained an injury to my wrist, which now developed a nasty arthritis. I might not be able to ride a motorcycle at all, or i may just ride through the pain. I don’t know yet, but ill be seeing some great doctors. Who knows!
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