Ordered some from Amazon. From everything I'd read these were going to be a real pain to get in place, so I bought the big washers and made the homemade version of the driver tool.
They are small enough that they don't even stick in the port. Driver tool wasn't needed.
Is this strange or normal?
I've not had an issue with exhaust gaskets, Evo or twin cam (same gasket). Worst case, I take a 3/8" extension, 6", and just use it and a hammer to tap in the gasket.
I guess it depends on which gasket you use, stock (thick and kind of a pia) or Screaming Eagle style (thin and flat, generally pretty easy to install).
The tool is for the mesh type gasket.
Cometic and James fit tight Cyco fit loose.
It's normal. Those ones from Amazon are garbage. If you're in a pinch you can work them a tad oversized off the bike by pulling them apart slightly in different spots, but they generally suck.
The above mentioned brands (plus S&S) will fit perfectly
Not everything bought from Amazon can be declared as junk. I buy these in ten packs.
C9247 Cometic (https://www.amazon.com/Cometic-Gasket-Exhaust-Gaskets-Style/dp/B00M9NL2TO/ref=sr_1_57?crid=LFET7WHS35VH&keywords=harley+exhaust+gasket+c9247&qid=1648785814&sprefix=harley+exhaust+gasket+c9247%2Caps%2C70&sr=8-57)
That's a good deal Brian. 10 @ $4.57 ea. :up:
$6.00 + tax @ the local Harley dealer.
Why did these gaskets come with two rolls of red container ptfe tape?
Nevermind I guess they are to keep them from getting crushed during shipping
C9247 Cometic exhaust gaskets, with a short spray of Loctite Adhesive Spray on 1 end is your friend. Hands down the Best of the best. :up:
John
Cometic makes more than one ring or SE style gasket. Which one is the stiff one? I like them because they don't collapse into the port. I lost the number I used to order . :emsad:
Cometic Exhaust Gaskets.
EX 130. Big bucks spiral wound stainless. Can be leakers.
C9247. Race style .240" thick. *** my go to.
John
Quote from: jsachs1 on March 30, 2022, 03:07:11 PMCometic Exhaust Gaskets.
EX 130. Big bucks spiral wound stainless. Can be leakers.
C9247. Race style .240" thick. *** my go to.
John
Are the C9247 more rigid than the SE gasket? The ones I am chasing are silver with what appears to be wire and not flexible to handle. You can't make a thumbnail mark in them with fairly heavy pressure. They also take well to snugging down, seal real well and don't deform into the exhaust flow like some (SE).
Quote from: kd on March 30, 2022, 05:35:51 PMQuote from: jsachs1 on March 30, 2022, 03:07:11 PMCometic Exhaust Gaskets.
EX 130. Big bucks spiral wound stainless. Can be leakers.
C9247. Race style .240" thick. *** my go to.
John
Are the C9247 more rigid than the SE gasket? The ones I am chasing are silver with what appears to be wire and not flexible to handle. You can't make a thumbnail mark in them with fairly heavy pressure. They also take well to snugging down, seal real well and don't deform into the exhaust flow like some (SE).
No. they are NOT the tapered ID style. They're like the earlier round gaskets, just thicker, .240". Realize another thing when choosing exhaust gaskets. Pipes, depending on manufacture, have different, taper, and flat end, where they go into the port.
John
Quote from: jsachs1 on March 31, 2022, 02:11:17 PMQuote from: kd on March 30, 2022, 05:35:51 PMQuote from: jsachs1 on March 30, 2022, 03:07:11 PMCometic Exhaust Gaskets.
EX 130. Big bucks spiral wound stainless. Can be leakers.
C9247. Race style .240" thick. *** my go to.
John
Are the C9247 more rigid than the SE gasket? The ones I am chasing are silver with what appears to be wire and not flexible to handle. You can't make a thumbnail mark in them with fairly heavy pressure. They also take well to snugging down, seal real well and don't deform into the exhaust flow like some (SE).
No. they are NOT the tapered ID style. They're like the earlier round gaskets, just thicker, .240". Realize another thing when choosing exhaust gaskets. Pipes, depending on manufacture, have different, taper, and flat end, where they go into the port.
John
Agree, I only uses these.
68-9247 cometic - 01.jpg
How stiff are those Brian? Cosmetic list more than 1 of that description but I think only one is stiff. Did Vince send you gaskets with the Burns pipe? They are the stiff ones. SE is not.
Thanks for the measurement John. I am down to 4 so I'll measure the height and see if they are .240. It may be a height difference in the other non tapered they offer.
The ones I use are like the ones in Brian's pic. I have ended up with softer ones by accident but can't find or remember the source or part number. Vince at Burns couldn't tell me either so I just ordered a few from him to get me by.
These are the same as the gaskets Burns sent. They're stiff, they don't crush down like the SE gaskets.
Puuurrrfect Thanks. :up: Now I know they are like your gaskets in your pic. (BTW you may have a typo in your first post with the Amazon link. The C9928 doesn't seem to exist in the Cometic catalogue online and I can't find my good catalogue they gave me at SEMA. :wink: ) I'll have to dig around now. I'm on a mission. :scratch:
John, the measurement on mine as mentioned from Burns are .125 X .125 band and 1.852 OD as near as can be measured with a composite makeup. I will order a couple like your C9247 gaskets for comparison.
Yeah, these are C9247, the C9288 is the tapered gasket.
Quote from: Ohio HD on March 31, 2022, 09:06:10 PMYeah, these are C9247, the C9288 is the tapered gasket.
I have a few of the C9298 tapered gaskets for my Dragula pipe. My flat (race style) gaskets look like the ones in the card you posted a pic of and I measure to be .125" thick, not .240". They would look twice as tall as the .125" width. I think I will have to call Cometic to get some sort of confirmation on the numbers before ordering.
Cometics current rundown:
(This was under the M8 listing)
C9247 EVO, TWIN CAM, M8 EX. RACE STYLE .240" THICK,
C9540 EVO, T/C, M8 HI PERF.EX GASKET SPIRAL WOUND
C9719 EVO, T/C, M8 RACE STYLE EX. .110" THICK GASKET
C9288 EVO,T/C, M8, 65324-83A OE REPLACEMENT GASKET
C9540 appears to be a metal "o-ringish" type
I don't have my 10 pack where I'm at.
I'm pretty sure I got the C9719 though, they sure aren't .240 thick.
And they aren't the tapered style.
For what it's worth they are available in 2 packs and 10, ad a -2 to end of number for 2.
Thanks Cheech. That's what I see in the on-line Power Sport V-Twin Performance Gasket Catalogue. I have a hard copy tucked away somewhere. :banghead: I didn't think they were the C9719 because I measure them at .125". Having said that, they are a composite makeup and may be just measuring .015 larger with the Vernier caliper. As I said, the ones I have been using are the best (for me) so far. I am willing to sample the .240" sizze but want to be sure I have at least a 10 pac of the present ones.
Well given what they are, I'd expect a sizable variation amongst them.
The catalog listing I'd guess is a nominal design spec.
Quote from: cheech on April 01, 2022, 06:58:50 AMCometics current rundown:
(This was under the M8 listing)
C9247 EVO, TWIN CAM, M8 EX. RACE STYLE .240" THICK,
C9540 EVO, T/C, M8 HI PERF.EX GASKET SPIRAL WOUND
C9719 EVO, T/C, M8 RACE STYLE EX. .110" THICK GASKET
C9288 EVO,T/C, M8, 65324-83A OE REPLACEMENT GASKET
C9540 appears to be a metal "o-ringish" type
I don't have my 10 pack where I'm at.
I'm pretty sure I got the C9719 though, they sure aren't .240 thick.
And they aren't the tapered style.
For what it's worth they are available in 2 packs and 10, ad a -2 to end of number for 2.
C9540 is the new # for the EX130. Pricey, and can leak.
Ohio's pic is the C9247. My go to gaskets on most pipes.
John
Quote from: jsachs1 on April 01, 2022, 01:57:55 PMC9540 is the new # for the EX130. Pricey, and can leak.
Ohio's pic is the C9247. My go to gaskets on most pipes.
John
John, was the EX130 a Cometic number?
Agree, the C9540 has always leaked when I used them. You have to get the pipe really tight. Doesn't work well with pipes that use the spilt ring under the exhaust flange. Solid pipe flanges like D&D aren't as bad.
I think Kuryakyn 482 gasket are like the C9540. I could never get them to seal either.
C9540 Cometic
(https://static.summitracing.com/global/images/prod/xlarge/cvt-c9540_xl.jpg)
Kuryakyn 482
(https://m.media-amazon.com/images/I/71sOSJ5bZ0L.jpg)
KD, I have to open my mouth and remove my foot..... :embarrassed:
I went to the Burn's kit in the box, they're 0.125" thick.
I may not always be right, but I'm honest.
Burns exhaust gasket 0.125 inch thick - 02.jpg
Burns exhaust gasket 0.125 inch thick - 03.jpg
No big deal. I can tell you they work well and don't flare out into the port when tightened down. To me, they look dimensionally like the one in your pic of the card of 10. That was what got me interested so I could order another card of them. If the ones in your card are the same stiffness as what Burns supplied I am looking for the part number. It won't be the .240" ones John uses but I have a Cometic list to send in and I think I will order a few of them to compare and try also. I somehow think John knows what works. :wink: For now, the ones Burns sent you are the best I have used and definitely put the SE offering on the trailer.
The picture is the 0.240" thick, C9247. I have an order in for C9719. Don't order anything until I get these and check them out.
C9719 Cometic (https://www.cometic.com/products/C9719-1)
@kd these are the C9719 from Cometic. They're the same gasket that Vince sends with the exhaust systems. 0.125" thick, and packed tight.
Cometic ex gasket ~ 0.125 - 04-06-2022 - 01.jpg
Cometic ex gasket ~ 0.125 - 04-06-2022 - 02.jpg
Cometic ex gasket ~ 0.125 - 04-06-2022 - 03.jpg
Cometic ex gasket ~ 0.125 - 04-06-2022 - 04.jpg
That's great Ohio. That's them. I'll order some up now.
I can tell you in my experience anyway, they are the best I have used, especially on the Burns spigots. I agree that some need the taper to fit the shape of the pipe top but the strength of these rings really secure the header well and do not collapse into the port when tightened.
That little gasket can really interrupt the flow when that happens. I had a tune go to the dumper that turned out to be just that. The SE gaskets are way softer. It started hunting on cold start and got worse. You'd think it was a blower pumping68EBFD1A-537A-4DBD-97F3-4426C25C0546.jpgD7D6628A-4C05-490F-A571-D9884328C4EB.jpg away for up to a minute when it was real bad.