Maintenance & Technical > KX500 Original
Exhaust port sealing
Polar-Bus:
--- Quote from: bigtwin100 on May 16, 2011, 04:31:12 AM ---Thanks for the tip. I don't have alot of spooge but sometimes that port is worn and new orings don't seal and I hate globbing RTV on anything. I run 44:1 and probably going to go to 50:1
--- End quote ---
Are you running stock jetting ? If you don't have the space to allow the engine to rev WO for longer periods, excessive spooge will also ba an issue. Try leaning your needle clip one position and see if that helps... 44:1 premix is right where you want to be, so im thinking jetting. Do you know for sure you have a healthy top end also ?
bigtwin100:
It's just a tip. My jetting is fine. Just passing on a little trick
delphipro5:
Try rescue tape.(the stuff for fixing holes in radiator hose ) It will seal much better than teflon tape, and hold up to fuel exaust fumes and high temperature much better. You will only need one layer or so. Teflon tape is not meant for fuel/oil high temp. applications. this stuff IS. Personally though I use red RTV.
I have heard of putting an x-tra crush ring in to move the seating surface of the o-rings out slightly, so they are no longer in the grooves. But this may adversley effect perfomance by moving the pipe out from the head ever so slightly. Not sure, but if you could get them to seat in a different location that would get them to seal better. I would also condition ALL of my o-rings with dielectric grease(silicone jelly, R/C Car diff lube) prior to using them.
With a grooved exaust port even brand new o-rings will not seat properly without some sort of assistance. The only real way to solve the problem is have the walls of the port filled up with material (weld) and machined back to spec. ($$$) :wink:
Larry Wiechman:
If you've got spooge blowing out, you've also got air, water, dirt, etc... being sucked back into the engine.
sylvester:
Used to use this stuff back in the day on my 1985-86 and 88 CR125's. Works great.
http://www.denniskirk.com/jsp/product_catalog/Product.jsp?skuId=&store=Main&catId=&productId=p14700&leafCatId=&mmyId=
We would use it on both ends of the pipe, the exhaust flange and the silencer connection.
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