Exhaust Blew the exhaust gasket today...

Discussion in '2-Stroke Engines' started by JosephGarcia, Apr 22, 2007.

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  1. JosephGarcia

    JosephGarcia Guest

    How exactly would I go about making a new one? I also heard you need this "gasket sealant" stuff, how much is it, I need to drive this bike by tomorrow.

  2. rcjunkie

    rcjunkie Guest

    Go to Napa, buy some gasket material. Trace the shape of the flange on the gasket material and using a small hobby knife, cut out the exahust hole and bolt holes. Using some permatex gakset maker and coat both sides of your new gasket. Install, torque nuts on exhaust studs, and ride.
  3. JosephGarcia

    JosephGarcia Guest

    I heard some of you make gaskets out of cardboard, the squished kind of carboard which has no holes, correct? I found a good 2 millimeter thick piece. which is a good deal stronger than the "cereal box gaskets" I heard of, if indeed they are made out of cereal box cardboard.

    Would I just cut it out, install, and go? or use some of that sealer I hear about. Also, is this sealing stuff available at an autozone?
  4. Hugemoth

    Hugemoth Guest

    I wouldn't use cardboard for an exhaust gasket. Get some of the right stuff at the auto parts store and it will be better than the original.

    BTW I don't use sealant on the exhaust gasket. Just isn't necessary.

  5. gone_fishin

    gone_fishin Guest

    a tip for both exhaust and intake: one reason the gasket blows is because the flange isn't exactly flat, put a flat file to it & clean it up before re-install, since doing this i haven't had to re-replace either gasket.
  6. JosephGarcia

    JosephGarcia Guest

    Ok, so I went, got the gasket material, and left quick. Cut it out, flattened the two metal halves, everythings nice and tight, no leaks.

    One Problem.... I realized I got a "Water Outlet" gasket material.....

    Can this be used? The engine runs. Or should I immediately buy some of the other kind. thick rubber stuff.
  7. azbill

    azbill Active Member

    I think rubber gasket will melt with heat from exhaust
    try some high temp gasket material
  8. JosephGarcia

    JosephGarcia Guest

    Yeah, I just purchased Permatex High-Temp RTV Silicone gasket maker stuff.

    There goes my money for the rest of the parts to complete my lighting system.

    The bottle says let it cure for 24 hours, but I NEED to drive my bike in about 5. Is it safe? I already drove it a mile with this thin papery gasket.
  9. Guest

    Guest Guest

    Go ahead and ride.

    The worst you can do is "re-blow" the gasket. You'll just have to make another.

    Don't buy rubber material.

    Check the temp. limit on the RTV sealer, it may not be high enough for exhaust purposes, the gasses can reach 1000+ degrees F. It's not really needed for the exhaust gasket anyway.

    Water outlet gasket material will probably work fine.....what's on these from the factory is pretty bad as gasket material goes.

    Keep us posted on how it goes.
  10. JosephGarcia

    JosephGarcia Guest

    Well I rode it around all day at around 40+ MPH with no problems from the exhaust, engine ran pretty cool as well the whole time.

    Also saw another motor biker with some honda four stroke mounted in his red beach cruiser, he could only do 20 tops, haha. He was amazed with my engine, as he never seen another one before. Thought that was pretty cool.
  11. Vongould

    Vongould Guest

    gasket tip

    I to had lots of trouble with the exhaust gasket. Two strokes get very very hot. Much hotter than 4 strokes. I found that even the high temp gasket sealer gave out way too soon. My solution was to cut and drill a gasket from a small piece of soft sheet aluminum. This worked great.
  12. Dockspa1

    Dockspa1 Guest

    Hey Vongould,
    How thick was the aluminum and did it seal it match flame tight?
    I wonder if copper would work the same?
  13. Vongould

    Vongould Guest

    aluminum gasket

    I am not sure how thick it is. A bought it at Ace Hardware, it was just a small sheet (maube 4inches x 8 inches). It has sealed pefectly without any gasket sealer. Copper would probably work just might be harder to cut and shape.
  14. Butch

    Butch Guest

    I wonder if a few thicknesses of aluminum foil as used for lining baking pans would work the same? Would be a cheap alternative if it works.
  15. nik

    nik Member

    interesting topic.. I have had some issues with my exhaust gasket also.

    The one that came with the kit, fell apart pretty quickly.

    I purchased some gasket material "cork/rubber" from autostore.. The material is soft but does not hold up well under the heat of the exhaust.

    I also cut out some cardboard but that didnt work. so, I just purchased some RTV Ultra Copper Silicone Gasket stuff. It is nice because its liquid and goes on evenly.. but, will it hold up? the temp says up to 700degrees.

    Reading the thread above makes me wonder if it will work. I may need to try the aluminum sheet gasket mentioned above.

    (( its raining out today, but tomorrow i will find out if RTV worked on exhaust ))

    Anyone have other methods and ideas for exhaust gaskets? if so let us know ;)
  16. fastboy9

    fastboy9 Member

    Ye the stock exhaust gaskets should be illegal, they dont last at all. Before i fitted my new pipe I made a gasket out of copper sheet and used gasket sealant on the flange. This worked but still spluttered oil quite a bit, wouldnt recommend it
  17. highrider

    highrider Guest

    my gasket blew a week ago. now I use cardboard as i dont have replacement, but a bit of oil gets out. also had the bolts come out twice, so had to twist a bit of wire to try to stop them popping when it gets hot.:eek:
  18. fastboy9

    fastboy9 Member

    what do you mean by twist a bit of wire? because I alsways get problems with the bolts vibrating out too.
  19. SirJakesus

    SirJakesus Guest

    I found I had problems with exhaust gaskets going all the time until I secured my muffler to the frame with a metal strap (i think its a large pipe clamp) since I used that and some auto exhaust gasket material it's been fine ever since. I think my sparkplug leaks more oil than the exhaust manifold now :)
  20. sparky

    sparky Active Member

    I finally got around to putting gasket sealant (permatex 1A) on both sides of the thin cardboard gasket & putting the exhaust back on. Sad part is that I forgot to let it dry & I went riding almost immediately afterward. Don't think it'll be a real problem, but we'll see.

    I haven't had problems with my exhaust bolts vibrating out yet, but some thread locker should do the trick. I bought the red stuff yesterday, but my friend says that stuff is TOO strong. I'll prolly be going back today to switch out for the blue (medium strength).