Moderator Airhead Posted May 10, 2009 Moderator Share Posted May 10, 2009 It is important that a two stroke engine is pressure tight and to check my DT175MX I made a a test rig and did some testing today. This is the test rig I made, it fits nicely in the inlet manifold where the reed valve is, So I removed the silencer and blocked off the exhaust using the original connecting rubber from exaust to silencer, I bunged the end up using a copper piping stop end. and then fitted the test rig into the manifold and pumped the engine and exhaust to 10 psi And bugger...it leaks so the only place I can test is the right hand crank seal, to test this one put the engine breather pipe in some water No bubbles here so the leak is elsewhere, It could be on my blanked off exhaust, the exhaust manifold, cyl head or base joint, my test rig, inlet manifold or left crank seal. All I know is it drops from 10psi to 5psi in just over 3 mins, so I'm going to have to get some leak detector spray, I suppose I could use soapy water but I have the real thing at work so abandoned the job for now.... 1 Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted May 10, 2009 Moderator Share Posted May 10, 2009 Impressive. I would be too worried to do anything like that with mine at the moment. Link to comment Share on other sites More sharing options...
wild foamy Posted May 10, 2009 Share Posted May 10, 2009 carefull OG, if you pump it up too much it may float awaaaaaayyyyyy! Link to comment Share on other sites More sharing options...
Moderator Airhead Posted May 10, 2009 Author Moderator Share Posted May 10, 2009 carefull OG, if you pump it up too much it may float awaaaaaayyyyyy! orrr it mght grow to be a 250... Link to comment Share on other sites More sharing options...
Moderator drewpy Posted May 11, 2009 Moderator Share Posted May 11, 2009 orrr it mght grow to be a 250... now your "over boring" us Link to comment Share on other sites More sharing options...
Moderator Airhead Posted May 17, 2009 Author Moderator Share Posted May 17, 2009 now your "over boring" us Haha prepare for som more boredom! Well i got the soapy spray and found a leak at the end of the exhaust, I hadnt made a good enough job here So having cured that one I soon found another at the intake manifold, these things have an in-built O ring that has become a bit flattened after its 30 ish years of life, so having priced one up at £48 (Thats not dear...said the man at Granby's) I decided to buy some silicone gasket goo from my local car spares shop...£5.00 . A ring of the stuff around the manifold and hey presto, my engine is air tight, held 10 psi forever. Peace of mind if nothing else, i had the engine completely in bits not too long ago so it had new crankshaft seals which are obviously good but now I know that the crancase halves are sealed well too, .. Link to comment Share on other sites More sharing options...
Moderator Cynic Posted May 17, 2009 Moderator Share Posted May 17, 2009 Haha prepare for som more boredom! Well i got the soapy spray and found a leak at the end of the exhaust, I hadnt made a good enough job here So having cured that one I soon found another at the intake manifold, these things have an in-built O ring that has become a bit flattened after its 30 ish years of life, so having priced one up at £48 (Thats not dear...said the man at Granby's) I decided to buy some silicone gasket goo from my local car spares shop...£5.00 . A ring of the stuff around the manifold and hey presto, my engine is air tight, held 10 psi forever. Peace of mind if nothing else, i had the engine completely in bits not too long ago so it had new crankshaft seals which are obviously good but now I know that the crancase halves are sealed well too, .. The killer question OG, does she run any better now you have got rid of the leak at the manifold. Thats a bit of a critical one. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted May 17, 2009 Author Moderator Share Posted May 17, 2009 The killer question OG, does she run any better now you have got rid of the leak at the manifold. Thats a bit of a critical one. Thats a good one, I dunno yet havent started her up let alone been out, The wifey is in bed been on nights, also havent ridden this thing for almost a year now so ive forgot how it was anyhow...And Ive thoroughly cleaned and re built my carb so that might also make some difference... Link to comment Share on other sites More sharing options...
Moderator Cynic Posted May 17, 2009 Moderator Share Posted May 17, 2009 also havent ridden this thing for almost a year Shame on you........ Link to comment Share on other sites More sharing options...
wild foamy Posted May 18, 2009 Share Posted May 18, 2009 i'll give ya £1500 for it Link to comment Share on other sites More sharing options...
Moderator Airhead Posted May 18, 2009 Author Moderator Share Posted May 18, 2009 i'll give ya £1500 for it I'll think about it Oh OK then... Link to comment Share on other sites More sharing options...
wild foamy Posted May 19, 2009 Share Posted May 19, 2009 cheeky old bugger! ... swap it for a Jawa? Link to comment Share on other sites More sharing options...
Moderator Cynic Posted May 19, 2009 Moderator Share Posted May 19, 2009 cheeky old bugger! ... swap it for a Jawa? Thats like swapping a meal at the Ritz in Mayfair with all the trimmings for a Kebab with salad. Link to comment Share on other sites More sharing options...
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