Ron Burgandy Posted August 29, 2015 Author Report Share Posted August 29, 2015 (edited) What causes it to pressurizes the coolant system? So if the orings became bad somehow over the years that can cause it to overheat? I'll have to get a leak down test than. Can I just spray starter fluid around it to see if it revs? Sent from my iPhone using Tapatalk Edited August 29, 2015 by Ron Burgandy Quote Link to comment Share on other sites More sharing options...
rzresurrection Posted August 29, 2015 Report Share Posted August 29, 2015 The ORing isn't sealing 100% and the pressure created by the piston compressing the fuel/air mix gets pushed into the cooling system at the point of the failed oring. This forces the coolant out of the system thru the overflow Quote Link to comment Share on other sites More sharing options...
Ron Burgandy Posted August 29, 2015 Author Report Share Posted August 29, 2015 Nice thanks. And that will cause it to over heart? Sent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
rzresurrection Posted August 29, 2015 Report Share Posted August 29, 2015 Puke out the coolant and what cools the engine? No coolant = overheating Quote Link to comment Share on other sites More sharing options...
rzresurrection Posted August 29, 2015 Report Share Posted August 29, 2015 (edited) What causes it to pressurizes the coolant system? So if the orings became bad somehow over the years that can cause it to overheat? I'll have to get a leak down test than. Can I just spray starter fluid around it to see if it revs? Sent from my iPhone using Tapatalk Starter fluid - not recommended. You need a proper leakdown test. Not super hard to build. You can build a cheap leakdown tester. Here is a pic of mine. If you're serious about 2 strokes a leakdown tester is a must. Easy and cheap to make. Pull the engine and remove the flywheel. Plug all the entry and exit ways for the engine. White parts go into the intake boots, rubbers and plates cover the exhaust ports. Pump air into the schrader valve (6psi Max) and spray soapy water around the sealing surfaces. If you have leaks, you will have bubbles. That's the short version Edited August 29, 2015 by rzresurrection Quote Link to comment Share on other sites More sharing options...
Ron Burgandy Posted August 29, 2015 Author Report Share Posted August 29, 2015 I'm sure your right but My radiators full of fluid so I can't see how leaking a little fluid would cause it to overheat Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
rzresurrection Posted August 29, 2015 Report Share Posted August 29, 2015 If you have a failed head oring, you are essentially air-locking the cooling space around the head by continually forcing in air/fuel mix into that space. By doing this you've effectively reduced the cooling capacity of your system causing it to overheat. Quote Link to comment Share on other sites More sharing options...
camp0429 Posted August 29, 2015 Report Share Posted August 29, 2015 Also might be worth your time to check your radiator cap, if its junk it wont hold pressure Quote Link to comment Share on other sites More sharing options...
rzresurrection Posted August 29, 2015 Report Share Posted August 29, 2015 True enough. Good one. Quote Link to comment Share on other sites More sharing options...
mike0chek Posted August 30, 2015 Report Share Posted August 30, 2015 sounds like its hydrolocking but checking the rad cap is a quick easy thing to check Quote Link to comment Share on other sites More sharing options...
rzresurrection Posted August 30, 2015 Report Share Posted August 30, 2015 You mean coolant system is cavitating? Hydro locking breaks breaks con rods, pistons, etc Quote Link to comment Share on other sites More sharing options...
Ron Burgandy Posted August 30, 2015 Author Report Share Posted August 30, 2015 All I know is it overheats now and it never did before. Impeller checks out ok and radiators seems fine Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
rzresurrection Posted August 30, 2015 Report Share Posted August 30, 2015 My comment was directed to mike0chek. I should have quoted his post Check the cap, check the head orings. Do a leakdown test afterwards. My $0.02 Quote Link to comment Share on other sites More sharing options...
mike0chek Posted August 30, 2015 Report Share Posted August 30, 2015 im thinking theres an air bubble in the cooling system possibly Quote Link to comment Share on other sites More sharing options...
registered user Posted August 30, 2015 Report Share Posted August 30, 2015 (edited) wtf . hook a cooling system tester up if you want to find a leak. pressuring up the engine side likely wont do any good as your only typically using 6psi or less. besides that, if your dumb youll have the piston above the ports so no air pressure will get to the head anyways hahah Edited August 30, 2015 by registered user Quote Link to comment Share on other sites More sharing options...
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