Hello and Welcome!

How easy is the site to use and join?

  • Easy

    Votes: 25 45.5%
  • pretty easy

    Votes: 14 25.5%
  • normal

    Votes: 15 27.3%
  • kind of hard

    Votes: 2 3.6%
  • needed a map, a guide and a compass!

    Votes: 0 0.0%

  • Total voters
    55

Tony01

Well-Known Member
Nov 28, 2012
1,383
813
113
sf bay area
Hey I’m new here. Built a 66cc bike and put about 10-15 miles on it so far. I’m enjoying the knowledge here but it’s hard for me to navigate bc I’ve never been part of a forum or anything. Can anyone point me to some exhaust gasket help? I’ve blown mine and want to know if there’s anything I can use as a temp replacement while one is shipped
There isn’t really as far as quick fixes go.
 
  • Like
Reactions: Khalil Brooks

xXNightRiderXx

Active Member
Jan 12, 2017
414
62
28
Boise
I think you'd be fine without one so long as you don't heat it up too much. The exhaust gasket is really just there to prevent the exhaust pipe from binding to the head or jug under heat. If you really need to run it normally, then you might be able to use a piece of aluminum can and a very thin layer of high temperature grease to get that seal.
 
  • Like
Reactions: Khalil Brooks

Khalil Brooks

Member
May 10, 2020
34
10
8
22
I think you'd be fine without one so long as you don't heat it up too much. The exhaust gasket is really just there to prevent the exhaust pipe from binding to the head or jug under heat. If you really need to run it normally, then you might be able to use a piece of aluminum can and a very thin layer of high temperature grease to get that seal.
I appreciate this a lot, I was a bit concerned that there might be an issue with vacuum leaks or compression issues from using something else. Do you know what the material is? I’d prefer to buy stuff to cut more gaskets if I can
 

curtisfox

Well-Known Member
Dec 29, 2008
5,111
1,512
113
minesota
ACE hardware has matieral to cut gaskets, not sure about exhaust, but auto parts stores also have it. Exhaust is usually a asbestos type of matieral.
Compression leak you can sand the head flat with wet-dry sand paper on flat surface, glass, or like a table saw table, mark with sharply, sand till it disappears.......Curt
 
  • Like
Reactions: Khalil Brooks

Tony01

Well-Known Member
Nov 28, 2012
1,383
813
113
sf bay area
Exhaust gaskets are not the same as intake gaskets. Exhausts see high temps and pressure. Using aluminum, copper, or intake gasket material will burn or blow right out. It might work for 5 minutes. An exhaust gasket is made up of a high temp sealing material and a steel mesh to keep it together.
 
  • Like
Reactions: Bikeguy Joe

xXNightRiderXx

Active Member
Jan 12, 2017
414
62
28
Boise
ah, I wasn't aware that exhausts are subject to high pressures along with temperatures, I just figured that a high temp grease would help keep the aluminum can piece from burning out. What kind of pressures are we talkin though? Surely it couldn't be any higher than 40psi?
 

Khalil Brooks

Member
May 10, 2020
34
10
8
22
ah, I wasn't aware that exhausts are subject to high pressures along with temperatures, I just figured that a high temp grease would help keep the aluminum can piece from burning out. What kind of pressures are we talkin though? Surely it couldn't be any higher than 40psi?
Yeah I’m curious too, temp and pressure ranges would be helpful. I’m often too stubborn for my own good and more info makes my decisions less dangerous
 
  • Like
Reactions: xXNightRiderXx

xXNightRiderXx

Active Member
Jan 12, 2017
414
62
28
Boise
Yeah I’m curious too, temp and pressure ranges would be helpful. I’m often too stubborn for my own good and more info makes my decisions less dangerous
Exhaust temperatures rarely reach higher than 600F. Although, if your exhaust is running hotter than 700F, chances are you'd need to replace some engine components for some race parts.
 

xXNightRiderXx

Active Member
Jan 12, 2017
414
62
28
Boise
At the port. The port will always give your highest readings, and the exhaust at the end of the muffler is often cool enough to use as a hand warmer on a frosty day.
 
  • Like
Reactions: Khalil Brooks

Brianr1074

New Member
Jul 12, 2020
11
4
3
46
Hello all, I an 1 year old to gas bikes and have 2, 1 is 2 stroke and other is 4 stroke. both I bought used and both had problems, now I am throwing more money at them at getting it going even better, Anyways, Hello all!
bike2 (2).jpg
 
  • Like
Reactions: FOG

Brianr1074

New Member
Jul 12, 2020
11
4
3
46
need help, chain keeps jumping, new chain, new build, I cant seem to get the chain in the middle of the sprocket.....

I keep trying different combo with spring tension roller. how do Line it up?

Thanks
B
 

Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
11,843
232
63
up north now
need help, chain keeps jumping, new chain, new build, I cant seem to get the chain in the middle of the sprocket.....

I keep trying different combo with spring tension roller. how do Line it up?

Thanks
B
Sound like a mismatch between the chain and sprocket sizes.
 

Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
11,843
232
63
up north now
Sometimes, the Exhaust Gas Temp. can reach OVER 1100 DEGREES F.

If it's only 6-700, you have a serious problem- like, the bikes not running.

Exhaust gas temperature is usually measured 3-4 inches away from the port side of the piston. Aluminum (depending on the alloy melts at around 1250F if I remember right.) That's why a lean run with toast your engine.

Now- let's move this to the proper forums, this is the Welcome forum.
 
  • Like
Reactions: FOG