Exhaust Head gasket & Exhaust Gasket Discussion - pics

Discussion in '2-Stroke Engines' started by davidsis, Nov 18, 2006.

  1. davidsis

    davidsis Guest

    Hey, my head gasket is leaking a little bit anyone know how to fix it. I have tightened the head bolts down to 15lbs. still leaks a little. If I keep riding with it leaking anyway will it hurt the bike?
     

  2. try1897

    try1897 Guest

    Hi, What makes you think its leaking? Do you hear it or what? I do know the tork specs. for the head bolts on my 80cc are 100 inch pounds. Myself not having an inch pound tork wrench I used my 1/4 inch drive socket so as to not put too much pressure on it and tightened in a criss cross patern and not too tight. I'd rather blow the gasket than break a head bolt. It worked fine for me .Then again I get lucky now and then. Tom in WV
     
  3. gone_fishin

    gone_fishin Guest

    yup, just give it a tweak after every ride during break-in, the first 20 miles i got about a full turn on mine, no problems at all since then. also, that spark plug doesn't like to stay in there, make sure you have it tight enough, you'll feel the washer give just a bit then snug up, you'll be all set.

    EDIT: figured i put this here for anyone else who wanders along...dax was mentioning to someone about keeping that head and jug clean. for real, on an air-cooled engine you need those metal fins to remain as clean as possible to dissipate heat properly.
    [​IMG]
    after 40 miles, tight & right!!
     
  4. yeah that was me, how can i keep it clean? i tried dusting it with a paintbrush...
     
  5. gone_fishin

    gone_fishin Guest

    i feel like suggesting automotive "brake-clean", quick drying & residue free, but read the can to see how it'll affect other materials. use it only on a cold engine.
     
  6. davidsis

    davidsis Guest

    Head gasket

    It looks like it is leaking because there is oil dripping down the engine. Looks like it is comming from the area of the head gasket. The spark plug is tight. I got the bolts torqued at 15lbs. Could be vibrating back out though.
     
  7. gone_fishin

    gone_fishin Guest

    huh? that doesn't sound good at all...maybe it's from a leaky exhaust gasket...are you sure you're accurately measuring your pre-mix? too much oil can be as bad as not enough. mind you, i'm only guessing...can you post a pic?
     
  8. davidsis

    davidsis Guest

    Head gasket

    Okay, I just do not know how to post a picture. Hey, what is that screw on the bottom of my muffler? Come to think of it the thing hardly smokes at all. Like no smoke. I put 7oz of oit in 1 gallon.
     
  9. davidsis

    davidsis Guest

    head gasket

    Will a leaky head gasket mess up my engine?
     
  10. gone_fishin

    gone_fishin Guest

    7 oz. to one gallon, that's 20:1, ok, are you using "real" oil & not "synthetic?" don't worry about not seeing smoke, the new oils burn much cleaner.

    ...a bad head gasket usually only affects performance, but during break-in i wouldn't want to guess about the consequences. how's the overall performance? how's it starting? is there a lot of noise...can you actually "hear" the leaky head-gasket? is it really dripping oil? actual dripping would indicate a pretty blown gasket or possibly a cracked head.

    can you take a pic and email it to me? i'll post it to see what other's think about your problem 8)
     
  11. try1897

    try1897 Guest

    Hi, My engine blew the gasket under the jug and it effected the idel. It wouldn't. but also it was making oil that collected in the area under the carb. I pulled the jug and made a new gasket and the problem was solved. I made the gasket the old fasioned way with a ball peen hammer tapping around the part in question and letting the sharp edge cut the gasket as you go. That made me quite nervous cause I kept thinking I was going to break the casting. But all worked well and its healed. Tom in WV
     
  12. davidsis

    davidsis Guest

    Head Gasket

    Trying to put a picture on. Maybe it is my exaust.
     
  13. gone_fishin

    gone_fishin Guest

    got this pic from davidsis, click the thumb for a larger image:
    [​IMG]
    wow! anybody got any suggestions for him?

    my input: it looks from the pic as if maybe the exhaust isn't tight enough...the lockwashers don't look all the way compressed. if they are, try this...clean the engine as good as you can, then run it only until you see leakage, it may help you locate the problem.
     
  14. okay that looked EXACTLY how mine looked after my exhaust gasket blew and the only thing I"ve done is replaced the EG with pieces of sock...no more oil problem for me...
     
  15. gone_fishin

    gone_fishin Guest

    but i bet ya look pretty silly riding around with one sock :p

    TIP: take this from a former muffler-man...if you notice, the holes on the exhaust flange are larger than the studs. this means that there is room for movement, which will result in a blown exhaust gasket. when i installed mine, rather than trying to center the flange, i let the weight of the muffler dictate where it sat, then i tightened it down. don't be afraid of it, that gasket is made to be compressed. i had to (barely) retighten it twice in the first 20 miles, but as you can see from my pic above, i'll probably never have to worry about it again.
     
  16. try1897

    try1897 Guest

    Yep it looks like the exaust gasket took a powder. Do the clean up thing and I'd bet if you look close you'll see its comming from the exaust .If so replace the gasket and its a fix . Tom in WV
     
  17. try1897

    try1897 Guest

    Hi again, I've changed my mind as to the leak coming from the exaust gasket. Today I went for a ride and upon my return I was looking things over and low and beholdoil was coming out of mine to and it was coming from the head gasket. I sure about it cause no other oil was present except what was coming out of the front at the head gasket.I wiped it down and got out a 1/4 inch ratchet and 10 mm deep well. I let it go cold then I gave the bolts a 1/4 turn in a X pattern and they did indeed seem to need it. I then took it for another run and let it cool and did another 1/4 turn. This time they seemed tighter . After another run the problem seems to be gone . No more leak at all. So It's offical After further review the call on the field is reversed and I now do believe you may have a head gasket leak. I was told by Mike Simpson to tork it to 100 inch pounds. But I don't have an inch pound tork wrench so I used the plan " B" method of "guesstamation" So far so good...... Tom in WV
     
  18. davidsis

    davidsis Guest

    Head gasket

    I tightened up the spark plug. I thank that fixed it. Thanks for all of the help especially augidog. It was leaking there and dripping down.
     
  19. Cookie

    Cookie Guest

    Davis

    First your oil to gas mix it to oily

    Second you blew that cheep paper gasket they use on the mufflers

    third you probably have the inside baffels mucked up so un screw the end pull the baffels and clean them. Then take and drill a couple holes through the muffler and the baffels once you have the muffler back together it might sound a little louder but it will run better.

    Cookie
     
  20. davidsis

    davidsis Guest

    Baffle

    There is only one little screw on the end of the muffler. I do not know if that will remove the baffle.
     
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