love2ride1111
Scoot Enthusiast
Posts: 222
Location: Indian Rocks Beach Florida
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Post by love2ride1111 on Oct 12, 2019 21:00:04 GMT -5
Since I recently posted photos on this site of my plug showing hot I have been on the attempt to repair my obnoxious exhaust leak. I've owned this bike for many years . So I recently tried several fixes and the first time the plug showed cooler but exhaust still loud. I have since tried make shift gaskets / extreme gray gasket sealer and its still loud as F****. What I also noticed weird as seemingly everytime I go back to check if bolts are tight they seem to want to tighten up more, this could be the next morning without even riding it !
I know it shouldn't be this loud from owning it so long. I do see oil around only one edge and lots of old oily grime around the port. Also last year I did repack the canister and really have not ridden it much at all so I don't think that is it. What can I do to seal this super tight.
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Post by oldgeek on Oct 12, 2019 22:12:26 GMT -5
Since I recently posted photos on this site of my plug showing hot I have been on the attempt to repair my obnoxious exhaust leak. I've owned this bike for many years . So I recently tried several fixes and the first time the plug showed cooler but exhaust still loud. I have since tried make shift gaskets / extreme gray gasket sealer and its still loud as F****. What I also noticed weird as seemingly everytime I go back to check if bolts are tight they seem to want to tighten up more, this could be the next morning without even riding it ! I know it shouldn't be this loud from owning it so long. I do see oil around only one edge and lots of old oily grime around the port. Also last year I did repack the canister and really have not ridden it much at all so I don't think that is it. What can I do to seal this super tight. What kind of Kymco, could you post a pic of the exhaust connection? |
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love2ride1111
Scoot Enthusiast
Posts: 222
Location: Indian Rocks Beach Florida
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Post by love2ride1111 on Oct 12, 2019 22:28:17 GMT -5
It is a Kymco Cobra Racer. You mean a photo of the exhaust connected to the port  There is nothing to see any longer as I ran my figures over all the gunk. |
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Post by harleyracer59 on Oct 13, 2019 0:30:21 GMT -5
pu a good bead of your favorite silicin on one of the mating surfaces. assemble hand tight till silicon starts to ooze from between flanges, wait an hour or so ( may take longer in colder weather and less in the heat, then torque to proper # starting at 5-10 ft/lbs and working up by 5=10 ft/lbs every round. and always tighten in a star pattern. and allow 24hrs to properly cure before returning to service
that hour wait time is an important step. it allows your made gasket time to set up and harden a little before you try to squeeze it out by tightening the bolts. good luck. You can do it!!!!
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Post by ryan_ott on Oct 13, 2019 8:32:28 GMT -5
Is the exhaust flange connection flat? Over tightening tends to pull the flange ears in leaving a gap at the center when tightened up.
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love2ride1111
Scoot Enthusiast
Posts: 222
Location: Indian Rocks Beach Florida
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Post by love2ride1111 on Oct 13, 2019 10:12:48 GMT -5
You wrote : pu a good bead of your favorite silicin on one of the mating surfaces. assemble hand tight till silicon starts to ooze from between flanges, wait an hour or so ( may take longer in colder weather and less in the heat, then torque to proper # starting at 5-10 ft/lbs and working up by 5=10 ft/lbs every round. and always tighten in a star pattern. and allow 24hrs to properly cure before returning to service I did exactly this , didn't work . It only has two bolts. Maybe I did not add enough silicone goop I noticed the studs can be spun a little bit in each direction but not totally in or out ,don't know if this has any repercussions . |
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Post by 190mech on Oct 13, 2019 10:40:24 GMT -5
Another thing to check is bolt the exhaust to the cyl flange(no gasket),but not to the muffler mount..The pipe mount and engine mount plate should line up perfectly,if you have to force the pipe to get the holes to line up then it must be redrilled or spaced to fit with zero stress...
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love2ride1111
Scoot Enthusiast
Posts: 222
Location: Indian Rocks Beach Florida
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Post by love2ride1111 on Oct 13, 2019 11:45:49 GMT -5
It lines up fine, just really loud for unknown reason , I've owned this for more then 10 years.
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love2ride1111
Scoot Enthusiast
Posts: 222
Location: Indian Rocks Beach Florida
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Post by love2ride1111 on Oct 13, 2019 13:57:42 GMT -5
You wrote : Another thing to check is bolt the exhaust to the cyl flange(no gasket),but not to the muffler mount..The pipe mount and engine mount plate should line up perfectly,if you have to force the pipe to get the holes to line up then it must be redrilled or spaced to fit with zero stress...
Ok I will try that . First time I read it I did not totally understand.
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Post by GrumpyUnk on Oct 14, 2019 19:54:47 GMT -5
Have you checked the exhaust flange on the pipe for being flat? Did you install a new 'crush washer gasket' onto the pipe and fitted the pipe up to the exhaust port by hand, feeling for the flange to lay flat on the port? Do that, and then tighten the long nuts by finger until you feel the the flange is held flat against the port, without any rocking, and then torque the nuts to about 10 ft/lb. They should not need a lot of torque, just enough to hold and enough so they don't decide to fall off.
On the 9 I have, there is a raised portion of the flange that will hold the exhaust gasket ring in place. Check that your ring is the proper diameter AND looks as if it will make contact all the way around the port surface without gap. If the gasket doesn't look as if it covers or matches the port diameter, you may have gotten the wrong size from your supplier. You can use bared solid copper wire, formed into a ring, as a gasket. It will flatten as you tighten, but you might do better to flatten it some, evenly, before installing.
tom
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Post by SMALL CC TEK on Oct 15, 2019 11:26:04 GMT -5
If you can't find a donut that fits exhaust make a gasket . Get some exhaust gasket material trace cut holes silicone to exhaust then put a bead on cylinder side and install . Make sure the exhaust flange is flat .
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Post by matlock on Oct 22, 2019 18:36:50 GMT -5
get a good grinder sand everything perfectly flat then jb weld all around donut hole on cylinder head and pipe bolts and let dry immediately after drying put about 1/4 cup j/b weld all around that sucker the bolts the exhaust the cylinder heads let dry and repeat this about 3 1/2 maybe 4 times each time adding more jb weld and if should be as quiet as a mouse on the night before christmas
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lupo76
Scoot Enthusiast
Posts: 157
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Post by lupo76 on Oct 24, 2019 6:22:40 GMT -5
New seal and clean it before mounting. Use the right sealing ring. Don´t tight nuts too hard as someone mentioned before. Absolutely never use silicone, jb weld or any other crap like that.
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Post by diynuke on Oct 25, 2019 10:33:25 GMT -5
i would reccomend an graphite gasket, they are soft so it will fill in the gaps. it can take a good beating. and it can handle the heat with ease. i made mine from an dn10 pn16 gasket
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There is nothing to see any longer as I ran my figures over all the gunk.
