Sealing oem carb holder to reed block

Got questions? We got answers....
Post Reply
JZ05220r
Supporting Member II
Supporting Member II
Posts: 564
Joined: 12:36 pm Mar 28 2021
Country: United States

Sealing oem carb holder to reed block

Post by JZ05220r »

I have plans to switch back to the stock reed cage as the Lectron will not work with the thicker v force reed block. I had an issue in the past with the carb holder not sealing fully to the reed block. I see that the built in o rings on the carb holder are what create the seal. I am wondering what the best solution is to be absolutely sure the reed block seals the first time around. Thanks
2005 KDX220r 1991 KDX200 2022 KTM 500excf
User avatar
Molly's 70
Platinum Member
Platinum Member
Posts: 563
Joined: 04:29 pm Jun 18 2017
Country: USA
Location: Wichita, Kansas USA

Re: Sealing oem carb holder to reed block

Post by Molly's 70 »

I always use the factory gasket.
If you lend someone $20, and never see that person again, it was probably worth it.
JZ05220r
Supporting Member II
Supporting Member II
Posts: 564
Joined: 12:36 pm Mar 28 2021
Country: United States

Re: Sealing oem carb holder to reed block

Post by JZ05220r »

Molly's 70 wrote: 06:28 am Nov 24 2022 I always use the factory gasket.
Hey, I’m talking about the area the carb holder and reed block that technically uses no gasket. Thanks and happy holidays
2005 KDX220r 1991 KDX200 2022 KTM 500excf
User avatar
Slick_Nick
Supporting Member
Posts: 1675
Joined: 10:06 pm Oct 22 2009
Country: Canada
Location: Calgary, Alberta
Contact:

Re: Sealing oem carb holder to reed block

Post by Slick_Nick »

JZ05220r wrote: 12:43 pm Nov 24 2022
Molly's 70 wrote: 06:28 am Nov 24 2022 I always use the factory gasket.
Hey, I’m talking about the area the carb holder and reed block that technically uses no gasket. Thanks and happy holidays
Put a very thin coat of grease on the seal lip it will allow the boot to kinda slide around a bit and help everything line up.
'00 KDX 220R
JZ05220r
Supporting Member II
Supporting Member II
Posts: 564
Joined: 12:36 pm Mar 28 2021
Country: United States

Re: Sealing oem carb holder to reed block

Post by JZ05220r »

Slick_Nick wrote: 10:11 am Nov 26 2022
JZ05220r wrote: 12:43 pm Nov 24 2022
Molly's 70 wrote: 06:28 am Nov 24 2022 I always use the factory gasket.
Hey, I’m talking about the area the carb holder and reed block that technically uses no gasket. Thanks and happy holidays
Put a very thin coat of grease on the seal lip it will allow the boot to kinda slide around a bit and help everything line up.
Thank you I’ll give that a go.
2005 KDX220r 1991 KDX200 2022 KTM 500excf
kdxdazz
Member
Posts: 430
Joined: 07:51 am Dec 28 2017
Country: thailand
Location: Thailand

Re: Sealing oem carb holder to reed block

Post by kdxdazz »

I went through this before too, if the o rings are damaged or flattened there is no way of sealing it, you can't just cut a gasket as the seal also holds the white plastic insert into the reed block, I tried many different combinations but in the end I bought a new carb boot, if you are able do a leak down test and spray around the carb boot to check for no leaks, I also have a lectron
1999 KDX220SR (KDX220-B5)
JZ05220r
Supporting Member II
Supporting Member II
Posts: 564
Joined: 12:36 pm Mar 28 2021
Country: United States

Re: Sealing oem carb holder to reed block

Post by JZ05220r »

kdxdazz wrote: 07:57 pm Nov 29 2022 I went through this before too, if the o rings are damaged or flattened there is no way of sealing it, you can't just cut a gasket as the seal also holds the white plastic insert into the reed block, I tried many different combinations but in the end I bought a new carb boot, if you are able do a leak down test and spray around the carb boot to check for no leaks, I also have a lectron
Thanks. I had a thought. Maybe I can just run a small bead of rtv around the outer o ring. The one that’s closes to the edges or the carb boot.
2005 KDX220r 1991 KDX200 2022 KTM 500excf
User avatar
SS109
KDXRider.net
KDXRider.net
Posts: 5770
Joined: 05:11 am Aug 23 2009
Country: USA
Location: Tucson, AZ, USA
Contact:

Re: Sealing oem carb holder to reed block

Post by SS109 »

JZ05220r wrote: 02:32 am Dec 03 2022
kdxdazz wrote: 07:57 pm Nov 29 2022 I went through this before too, if the o rings are damaged or flattened there is no way of sealing it, you can't just cut a gasket as the seal also holds the white plastic insert into the reed block, I tried many different combinations but in the end I bought a new carb boot, if you are able do a leak down test and spray around the carb boot to check for no leaks, I also have a lectron
Thanks. I had a thought. Maybe I can just run a small bead of rtv around the outer o ring. The one that’s closes to the edges or the carb boot.
Do not use RTV in gasoline situations.
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
JZ05220r
Supporting Member II
Supporting Member II
Posts: 564
Joined: 12:36 pm Mar 28 2021
Country: United States

Re: Sealing oem carb holder to reed block

Post by JZ05220r »

SS109 wrote: 12:49 pm Dec 03 2022
JZ05220r wrote: 02:32 am Dec 03 2022
kdxdazz wrote: 07:57 pm Nov 29 2022 I went through this before too, if the o rings are damaged or flattened there is no way of sealing it, you can't just cut a gasket as the seal also holds the white plastic insert into the reed block, I tried many different combinations but in the end I bought a new carb boot, if you are able do a leak down test and spray around the carb boot to check for no leaks, I also have a lectron
Thanks. I had a thought. Maybe I can just run a small bead of rtv around the outer o ring. The one that’s closes to the edges or the carb boot.
Do not use RTV in gasoline situations.
Ok i thought it was tolerant to gas.
2005 KDX220r 1991 KDX200 2022 KTM 500excf
kdxdazz
Member
Posts: 430
Joined: 07:51 am Dec 28 2017
Country: thailand
Location: Thailand

Re: Sealing oem carb holder to reed block

Post by kdxdazz »

JZ05220r wrote: 06:11 pm Dec 04 2022
SS109 wrote: 12:49 pm Dec 03 2022
JZ05220r wrote: 02:32 am Dec 03 2022

Thanks. I had a thought. Maybe I can just run a small bead of rtv around the outer o ring. The one that’s closes to the edges or the carb boot.
Do not use RTV in gasoline situations.
Ok i thought it was tolerant to gas.
Tolerant to oil not gasoline, threebond 1104 and 1211 is tolerant to gasoline
1999 KDX220SR (KDX220-B5)
JZ05220r
Supporting Member II
Supporting Member II
Posts: 564
Joined: 12:36 pm Mar 28 2021
Country: United States

Re: Sealing oem carb holder to reed block

Post by JZ05220r »

kdxdazz wrote: 07:24 pm Dec 04 2022
JZ05220r wrote: 06:11 pm Dec 04 2022
SS109 wrote: 12:49 pm Dec 03 2022

Do not use RTV in gasoline situations.
Ok i thought it was tolerant to gas.
Tolerant to oil not gasoline, threebond 1104 and 1211 is tolerant to gasoline
So do you think it will be safe to use one of those on the carb holder to reeds surfaces? I was thinking i should only use it on the out side o ring that is built in to the carb holder.
2005 KDX220r 1991 KDX200 2022 KTM 500excf
kdxdazz
Member
Posts: 430
Joined: 07:51 am Dec 28 2017
Country: thailand
Location: Thailand

Re: Sealing oem carb holder to reed block

Post by kdxdazz »

JZ05220r wrote: 02:21 pm Dec 16 2022
kdxdazz wrote: 07:24 pm Dec 04 2022
JZ05220r wrote: 06:11 pm Dec 04 2022
Ok i thought it was tolerant to gas.
Tolerant to oil not gasoline, threebond 1104 and 1211 is tolerant to gasoline
So do you think it will be safe to use one of those on the carb holder to reeds surfaces? I was thinking i should only use it on the out side o ring that is built in to the carb holder.
Yes, either one of those will work, 1104 fills gaps better 1211 is easier to remove, just remember to wipe everything down with thinners 10 times so it can bond
1999 KDX220SR (KDX220-B5)
JZ05220r
Supporting Member II
Supporting Member II
Posts: 564
Joined: 12:36 pm Mar 28 2021
Country: United States

Re: Sealing oem carb holder to reed block

Post by JZ05220r »

kdxdazz wrote: 03:42 am Dec 19 2022
JZ05220r wrote: 02:21 pm Dec 16 2022
kdxdazz wrote: 07:24 pm Dec 04 2022
Tolerant to oil not gasoline, threebond 1104 and 1211 is tolerant to gasoline
So do you think it will be safe to use one of those on the carb holder to reeds surfaces? I was thinking i should only use it on the out side o ring that is built in to the carb holder.
Yes, either one of those will work, 1104 fills gaps better 1211 is easier to remove, just remember to wipe everything down with thinners 10 times so it can bond
Ok having a hard time finding 1104 in the US. Not sure what a good alternative would be here. Maybe Permatex moto seal or Hondabond 4.
2005 KDX220r 1991 KDX200 2022 KTM 500excf
Post Reply