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Post by repherence2 on Nov 5, 2019 20:34:53 GMT -5
Is your exhaust flange on the bore flat?
Gotta make sure both mating surfaces are flat. The flange face on the bore as well as the flange face on the exhaust pipe. You can run a flat file over the mating surfaces to make sure they are flat.
Another possibility is that the flanges are not free of oil residue and the sealant is not bonding. Or possibly the flanges are too smooth. The mating surface where you apply sealant might need to be scuffed up with some 80 grit sand paper.
Every cylinder bore that i have seen does not have threaded sleeves. All of them have threads tapped directly into the base metal, even the aluminum bores too. There was a time when i hit a pothole and it ripped the pipe completely off my aluminum bore, destroying the female threads on the exhaust flange of the bore. I ended up buying a helicoil kit to fix the threads on the bore flange.
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love2ride1111
Scoot Enthusiast
Posts: 222
Location: Indian Rocks Beach Florida
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Post by love2ride1111 on Nov 5, 2019 21:14:19 GMT -5
Its clean , its flat as far as I can tell and tested and checked the straightness of the pipe flange last week. Ive tried all kinds of gasket ideas. It has been just about impossible to find the right O ring crush gasket. I cant find currently
I just don't understand it.
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Post by jloi on Nov 5, 2019 21:19:19 GMT -5
invisible hairline crack or pinhole in header pipe or flange ?
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love2ride1111
Scoot Enthusiast
Posts: 222
Location: Indian Rocks Beach Florida
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Post by love2ride1111 on Nov 5, 2019 21:51:28 GMT -5
I did think about that today. The flange is looking some different colored then the pipe. Yes maybe something there. I guess I could take it off fill it with water and see what happens ? I guess if that is the case, then its ruined ?
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love2ride1111
Scoot Enthusiast
Posts: 222
Location: Indian Rocks Beach Florida
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Post by love2ride1111 on Nov 5, 2019 22:41:45 GMT -5
So I just even looked for a new pipe to buy . Cant even find anything online in the states. If anyone can get me a tecnigas pipe for my kymco cobra asap , please let me know.
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love2ride1111
Scoot Enthusiast
Posts: 222
Location: Indian Rocks Beach Florida
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Post by love2ride1111 on Nov 5, 2019 22:57:10 GMT -5
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Post by Zino on Nov 5, 2019 23:18:28 GMT -5
This may be silly question Do the dio /elite pipes work for the cobra cross engine like they do for the kymco zx being that it is also a clone of the honda vertical engine setup.
If so partsforscooters.com and scootertuning.ca have pipes right now.
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love2ride1111
Scoot Enthusiast
Posts: 222
Location: Indian Rocks Beach Florida
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Post by love2ride1111 on Nov 5, 2019 23:38:49 GMT -5
Its horizonal , but I do not know much about other scooters I just own one. Its Cobra racer. I did peak on over at Parts For Scooters didn't seen anything at all. If it fits a Kymco Cobra or other Kymco like I've been seeing Top Boy or Super 8 , Could you forward the link if that's the case please ? Sadly I gave up on scootertuningca , I recently tried connecting with them and buying parts there , I don't know why but the guy acted absolutely clueless on anything Kymco , very unfortunate.
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Post by Zino on Nov 6, 2019 0:16:36 GMT -5
post up a pic of your current exhaust from multiple angles . Is there a serial number on your tranny by the back wheel That would help verify your engine type 190 mech is the pipe expert on here and keeps up the 2 stroke database. here is the link. 49ccscoot.proboards.com/thread/1391?page=1Does your pipe resemble any of those
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Post by repherence2 on Nov 6, 2019 0:24:07 GMT -5
Its clean , its flat as far as I can tell and tested and checked the straightness of the pipe flange last week. Ive tried all kinds of gasket ideas. It has been just about impossible to find the right O ring crush gasket. I cant find currently I just don't understand it.
so I take it you have been only using the o-ring type gasket, instead of the flat gasket with the copper flat ring in the center.
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Post by repherence2 on Nov 6, 2019 0:27:42 GMT -5
I did think about that today. The flange is looking some different colored then the pipe. Yes maybe something there. I guess I could take it off fill it with water and see what happens ? I guess if that is the case, then its ruined ?
air test with soap bubble solution.
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Post by repherence2 on Nov 6, 2019 0:28:38 GMT -5
Its horizonal , but I do not know much about other scooters I just own one. Its Cobra racer. I did peak on over at Parts For Scooters didn't seen anything at all. If it fits a Kymco Cobra or other Kymco like I've been seeing Top Boy or Super 8 , Could you forward the link if that's the case please ? Sadly I gave up on scootertuningca , I recently tried connecting with them and buying parts there , I don't know why but the guy acted absolutely clueless on anything Kymco , very unfortunate.
it might use the same pipes as the Honda AF34 or AF35 engine.
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Post by jloi on Nov 6, 2019 0:40:54 GMT -5
before I got another new pipe I would definitely leak test that one with water like you said . just the header pipe. looks like you don't even have to fill it all the way up. just fiure a way to "mostly" run a water hose up it and seal it enuff so water goes up in there a few inches. hopefully you could see a leak if you can keep it from being water all over the place. a slow fill with only a little bit of pressure.
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Post by jloi on Nov 6, 2019 0:43:42 GMT -5
I wouldn't be a bit surprised if you couldn't repair/weld a crack or pinhole. ask 190 mech. if you find one. what type of gasket have you been using?
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Post by Zino on Nov 6, 2019 0:45:37 GMT -5
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