HEAD GASKET CATASTROpHI - Page 7

bigdano711 · 10-22-2023, 09:35 PM

Looks like it can be re-used. Not like the crush gasket between head pipe and head. Can it be re-used?

Bill Hilly · 10-22-2023, 11:07 PM

Quote:

Originally Posted by bigdano711

Looks like it can be re-used. Not like the crush gasket between head pipe and head. Can it be re-used?

If it is still in good shape, I would have reused mine, but it was all brittle and broken.

Megadan · 10-23-2023, 01:01 AM

Quote:

Originally Posted by Bill Hilly

That is similar to how it is on the TBR7, and Brozz, and kinda like how the aftermarket exhaust that I have fit together. I don't know why the Hawk uses flanges on the pipe, and the big clamp. It works just fine, but has to be a little more expensive to do.

Same reason V-bands are so prevalent on exhaust systems in the aftermarket and even some OEM exhausts. Two machined surfaces even lightly pressed together make a perfect seal. No gasket or other seal material to fail. The hotter they get, the better they seal as the metal expands.

The only thing that really lets the one on the Hawk down is the clamp style they used. It has no retention for the mechanism that tightens the clamp, so it is prone to vibrating loose. I put some high temp loctite on mine and it helped, but I still had to snug it up from time to time. Another member here drilled a couple of small holes and safety wired it. That would be the best way to go.

Magician16 · 10-23-2023, 06:25 AM

I used a piece of high temp gasket material around the flange of the pipes. It press fits into the clamp and makes it way tighter.

zero_dgz · 10-23-2023, 10:57 AM

You can buy replacements for those graphite exhaust slip-joint gaskets very readily online. I found them on Amazon easily enough, and they're specified by inner and outer diameter -- no part number required. Example:

https://www.amazon.com/gp/product/B08YYJSR5Y

The one on my Orion was quite knackered after that little episode involving my exhaust falling off on the trail back when. I just measured what was left of it and ordered one that was close enough. I had to turn it down a hair on my belt sander which was quite easy, and it's been working just fine ever since.

I'm sure if you need one for a brand name bike you can hop down to your local dealer and order one by make/model/year. But we don't have that luxury, as we all know.

Zapkin · 10-23-2023, 04:43 PM

The dude that helped me fix the bike used some orange gasket stuff and it worked perfectly. How long will it last and will it leave a mess? i dunno. I am not a mechanic I only play one in my fevered imagination.

Bill Hilly · 10-23-2023, 06:05 PM

Quote:

Originally Posted by Zapkin

The dude that helped me fix the bike used some orange gasket stuff and it worked perfectly. How long will it last and will it leave a mess? i dunno. I am not a mechanic I only play one in my fevered imagination.

It's not going to be messy, now. I've never used the orange, but Permatex, and it's generic equivalent, can be messy when fresh, but is almost like rubber after curing. I hope you have been taking advantage of the nice weather we are having to catch up on riding. I rode my new bike yesterday, and got in a little bit of mud, and I can tell you that them tires don't get great grip. I rode the Hawk today, and I really enjoyed it. I think we have dry warm weather till Friday. I assume you are probably getting similar weather.

Zapkin · 10-23-2023, 07:26 PM

Quote:

Originally Posted by Bill Hilly

It's not going to be messy, now. I've never used the orange, but Permatex, and it's generic equivalent, can be messy when fresh, but is almost like rubber after curing. I hope you have been taking advantage of the nice weather we are having to catch up on riding. I rode my new bike yesterday, and got in a little bit of mud, and I can tell you that them tires don't get great grip. I rode the Hawk today, and I really enjoyed it. I think we have dry warm weather till Friday. I assume you are probably getting similar weather.

Its going to be near 72 tomorrow and I intend to go out the back roads, I dont want to beat on it too bad though because I am still missing a spoke. heheheh

Bill Hilly · 10-23-2023, 08:05 PM

Quote:

Originally Posted by Zapkin

Its going to be near 72 tomorrow and I intend to go out the back roads, I dont want to beat on it too bad though because I am still missing a spoke. heheheh

I forgot about you having a missing spoke. Have you checked the rest ?

Zapkin · 10-24-2023, 12:53 PM

Quote:

Originally Posted by Bill Hilly

I forgot about you having a missing spoke. Have you checked the rest ?

They all seem fine to me and that hole where it once lived is full of jb weld. The bike feels fine, but I am still going to be careful with it until after the holidays when I can get the rear rim replaced. About to head out into the backroads, but going to avoid the ones with huge potholes.

Zapkin · 10-27-2023, 01:01 AM

so much vibration I have to park it. Something is wrong. I will check the motor mounts tomorrow. I just jb welded everyting in place, spart plug, valve adjusters, etc. Once it hardens, my worries are gone.

Thumper · 10-27-2023, 07:25 AM

Quote:

Originally Posted by Zapkin

so much vibration I have to park it. Something is wrong. I will check the motor mounts tomorrow. I just jb welded everyting in place, spart plug, valve adjusters, etc. Once it hardens, my worries are gone.

Wait a minute! That stuff is epoxy. Kind of permanent, isn't it? What if you want to change the spark plug or adjust the valves?

Texas Pete · 10-27-2023, 08:54 AM

JB Weld is as Thumper mentioned an epoxy adhesive, but using it to repair an engine with vibrations is not a recommended solution. Vibrations in an engine can be caused by various factors, and they usually require a proper diagnosis and repair to address the mechanical cause(s). JB Weld is not designed to withstand the heat, pressure, and mechanical stresses that engines in general endure.

Thumper · 10-27-2023, 09:56 AM

I've seen it used successfully to seal up a smacked/cracked Suz GS750 case. It held.

But, I don't think it is a good idea on the valve adjusters. If it holds, you'll be trying to get it off to adjust your valves in the future. Chips and pieces will be in the head and circulate in the engine if you break pieces off. If it fails on its own, same thing... Chunks of hardened JB epoxy in your oil.

Bill Hilly · 10-27-2023, 10:16 AM

I know he used the JB on his rim, but I got the impression that the post about using it to keep things from vibrating loose was him just kidding.

10-22-2023, 09:35 PM	#91
bigdano711 Join Date: Jun 2023 Location: Big Piney, WY Posts: 425	Looks like it can be re-used. Not like the crush gasket between head pipe and head. Can it be re-used? __________________ 2023 Hawk 250 from XPRO off of Amazon MOUNTAIN MAN RC + MOTO on YouTube "If there were more bloody noses, there would be less wars." - Hagbard Celine "Someday, after mastering the waves, the winds, the tides and gravity, we shall harness for God the energies of love and then, for the second time in the history of the world, man will have discovered fire." - Pierre Teilhard de Chardin
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10-23-2023, 06:25 AM	#94
Magician16 Join Date: Aug 2019 Posts: 468	I used a piece of high temp gasket material around the flange of the pipes. It press fits into the clamp and makes it way tighter. __________________ 2018 Bashan Storm(sold) 2016 Magician 250
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10-23-2023, 04:43 PM	#96
Zapkin Join Date: Sep 2022 Location: Ohio Valley Posts: 686	The dude that helped me fix the bike used some orange gasket stuff and it worked perfectly. How long will it last and will it leave a mess? i dunno. I am not a mechanic I only play one in my fevered imagination. __________________ 2022 Hawk 250
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10-27-2023, 01:01 AM	#101
Zapkin Join Date: Sep 2022 Location: Ohio Valley Posts: 686	massive vibration and smell of burning oil so much vibration I have to park it. Something is wrong. I will check the motor mounts tomorrow. I just jb welded everyting in place, spart plug, valve adjusters, etc. Once it hardens, my worries are gone. __________________ 2022 Hawk 250
	0

10-27-2023, 08:54 AM	#103
Texas Pete Join Date: Nov 2022 Location: Dallas TX Posts: 578	JB Weld is as Thumper mentioned an epoxy adhesive, but using it to repair an engine with vibrations is not a recommended solution. Vibrations in an engine can be caused by various factors, and they usually require a proper diagnosis and repair to address the mechanical cause(s). JB Weld is not designed to withstand the heat, pressure, and mechanical stresses that engines in general endure. __________________ 2022 1/2 Templar X 250 - 6 gear model - 13 Front / 40 Rear Sprockets - #42 / #120 Jets - 1mm thick nitrile O-ring needle shim (removed) - Kenda K761 Dual Sport Tires - Sedona Standard Thickness Inner Tubes - Stock OEM battery, carburetor, spark plug still going strong - https://youtu.be/dhAYEKH-jFQ Texas Pete's Templar X 250 Torque Specifications Sheet Texas Pete's Engine Displacement Calculator Texas Pete's Tire and Rim Compatibility
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10-23-2023, 10:57 AM	#95
zero_dgz Join Date: Jan 2020 Posts: 253	You can buy replacements for those graphite exhaust slip-joint gaskets very readily online. I found them on Amazon easily enough, and they're specified by inner and outer diameter -- no part number required. Example: https://www.amazon.com/gp/product/B08YYJSR5Y The one on my Orion was quite knackered after that little episode involving my exhaust falling off on the trail back when. I just measured what was left of it and ordered one that was close enough. I had to turn it down a hair on my belt sander which was quite easy, and it's been working just fine ever since. I'm sure if you need one for a brand name bike you can hop down to your local dealer and order one by make/model/year. But we don't have that luxury, as we all know.
	1

10-27-2023, 09:56 AM	#104
Thumper Join Date: Feb 2021 Location: Kansas City Posts: 2,319	I've seen it used successfully to seal up a smacked/cracked Suz GS750 case. It held. But, I don't think it is a good idea on the valve adjusters. If it holds, you'll be trying to get it off to adjust your valves in the future. Chips and pieces will be in the head and circulate in the engine if you break pieces off. If it fails on its own, same thing... Chunks of hardened JB epoxy in your oil. __________________ -2022 5 speed Templar X Orange, OEM 51T rear sprocket, 14T front sprocket -NOS 2020 KTM 250SX (2-stroke motocross), less than 10 hours on it
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10-27-2023, 10:16 AM	#105
Bill Hilly Join Date: Feb 2021 Posts: 934	I know he used the JB on his rim, but I got the impression that the post about using it to keep things from vibrating loose was him just kidding.
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