s900t8v Posted July 17, 2014 Share Posted July 17, 2014 hey all I have an aussie AG 175 1975 model (apparently DT125 gearbox with 175 cylinder- reeds 24mm mikuni etc I just want to see how different hte porting is between cylinders ( or if it is different at all) if anyone has any port pics can they please throw them up cheers ed Link to comment Share on other sites More sharing options...
ianw0704 Posted August 5, 2014 Share Posted August 5, 2014 hey guys I currently own a 1974 dt 175, I am restoring it, at a very slow pace. The problem I have is that, I have took the head and barrel off, and at some point water has got into it, the piston, crank well everything in that area has rusted, to the point where nothing will move. Is there any way I can rectify this without buying a new engine? Link to comment Share on other sites More sharing options...
s900t8v Posted August 5, 2014 Author Share Posted August 5, 2014 no you'll at least need to rebuild the conrod if its corroded. you can buy conrod rebuild kits but need to be reasonably skilled and have a few tools (v blocks, press etc) to do a crank rebuild. any motorbike machine shop of worth can bore/hone a cylinder, if the rust in the cylinder is light then a hone may be enough, a bore will require new oversize piston looking at the cost of these things perhaps the cheapest optin is to buy another engine and dont strip it until you are ready to put it back together. Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted August 6, 2014 Moderator Share Posted August 6, 2014 Put the whole engine in a container of diesel for a week or two. You will need to strip the engine and see what is serviceable but it often frees up seized part so diss assembly is possible. Link to comment Share on other sites More sharing options...
s900t8v Posted August 11, 2014 Author Share Posted August 11, 2014 found some port maps in the clymer manual for 68-76 yamaha 175's also found another 3 page tuning document that describes very similar port maps Link to comment Share on other sites More sharing options...
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