Simon46 Posted May 1, 2015 Share Posted May 1, 2015 Just changed the 2 stroke oil on him fired him up and noticed bubbles coming out on carb side of head gasket. Was replaced and torqued to Haynes manual specs not 50 miles ago. Can head warp on such a small engine? Regards Simon Link to comment Share on other sites More sharing options...
Moderator Cynic Posted May 1, 2015 Moderator Share Posted May 1, 2015 Definitely, the Dt175 has a big bore for the metal in it, the head is relatively soft too. Its easy to take off though, bit of 500grade wet and dry on some flat surface. Rub in a circular motion and it will flatten out. The head gasket should stand re use. Be sure to check all the head studs are secure, they have a nasty habit of pulling out of the barrel. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted May 1, 2015 Moderator Share Posted May 1, 2015 yep the tired old threads just pull out of the barrel, may need a helicoil if you cant achieve a torque spec on one of the studs Link to comment Share on other sites More sharing options...
Simon46 Posted May 2, 2015 Author Share Posted May 2, 2015 Cheers will try the wet and dry on the head. Still runs ok funnily enougH! S. Link to comment Share on other sites More sharing options...
Moderator Cynic Posted May 2, 2015 Moderator Share Posted May 2, 2015 it will but if left you may hole the piston. Link to comment Share on other sites More sharing options...
Simon46 Posted May 17, 2015 Author Share Posted May 17, 2015 On the yambits gasket there is a ridge around it. Is it fitted with the raised part of the ridge to head or barrel? Link to comment Share on other sites More sharing options...
jimmy Posted May 17, 2015 Share Posted May 17, 2015 Don't know about 2T but on my twins, if I replace the head gasket, and on auld Triumphs it's almost an annual job, it is recommended re torquing the head after 50 miles and again after 500miles...Possibly not the same on strokers but just saying Link to comment Share on other sites More sharing options...
Moderator Cynic Posted May 17, 2015 Moderator Share Posted May 17, 2015 Doesent really matter tbh. Just check the studs are clean and the head is flat and true. Then tighten them down evenly to the right torque. That is more important really. Link to comment Share on other sites More sharing options...
Simon46 Posted June 18, 2015 Author Share Posted June 18, 2015 Finally removed exhaust. Turns out the rear head stud nut is 12mm socket where the rest of them are 13mm for some reason from the schoolboy 80s. All other head nuts are still torqued. Thread is stripped on stud. Another gasket kit then! Link to comment Share on other sites More sharing options...
Simon46 Posted June 18, 2015 Author Share Posted June 18, 2015 Oh just found the conrod big end is flapping up and down on the crank. and the threads have gone on the exhaust bolts. Woe is me Link to comment Share on other sites More sharing options...
blackhat250 Posted June 18, 2015 Share Posted June 18, 2015 Up and down simon ? not side to side , my kwaker triple did this on middle cylinder , rattled like hell, well its a crank big end for you then, Grampian eng [ Liverpool ] will supply and fit . Link to comment Share on other sites More sharing options...
Simon46 Posted June 19, 2015 Author Share Posted June 19, 2015 It did sound like someone hitting the cooling fins with a hammer when it was running. Its got side to side play as well. I see grampian do conrod kits for most machines. Will call them later. Many thanks! Link to comment Share on other sites More sharing options...
Simon46 Posted August 20, 2015 Author Share Posted August 20, 2015 Looks like my crank is wet with gearbox oil. Smells burnt.http://i235.photobucket.com/albums/ee14/Simon46/Mobile Uploads/DSC_0243.jpg And this is my new pistonhttp://i235.photobucket.com/albums/ee14/Simon46/Mobile Uploads/DSC_0244.jpg Link to comment Share on other sites More sharing options...
KevtheRev Posted August 24, 2015 Share Posted August 24, 2015 Make sure you fit new seals . Link to comment Share on other sites More sharing options...
Simon46 Posted August 24, 2015 Author Share Posted August 24, 2015 Again yes. Not even 50 miles since new seals and crank bearings fitted . Seen a post about an o ring so will be checking that too. Many thanks Simon Link to comment Share on other sites More sharing options...
Moderator Cynic Posted August 25, 2015 Moderator Share Posted August 25, 2015 (edited) That o ring fits on the crank under the distance piece behind the primary gear. Easy to miss/forget and easy to break.Will likely smoke like the qe2 if you left it out. Edited August 25, 2015 by Cynic 1 Link to comment Share on other sites More sharing options...
Simon46 Posted September 16, 2015 Author Share Posted September 16, 2015 Well just been to grampian. Fantastic service. Supplied me with full gasket set double sided oil seal for primary side and single sided for flywheel side. They checked crank o ring and said it was fine. The new rod has a slit in it for oiling the big end more. Nice and tight now!Regards Simon 2 Link to comment Share on other sites More sharing options...
Simon46 Posted September 16, 2015 Author Share Posted September 16, 2015 Oops busted by missus who came home early. House stinks of gearbox oil with crankcase in oven at 140 degrees. Frozen Crankshaft just fell into mains. Might be a takeaway tonight! 3 Link to comment Share on other sites More sharing options...
Moderator Airhead Posted September 16, 2015 Moderator Share Posted September 16, 2015 Oops busted by missus who came home early. House stinks of gearbox oil with crankcase in oven at 140 degrees. Frozen Crankshaft just fell into mains. Might be a takeaway tonight! did you clean the cases in the dishwasher.?..Top Tip Link to comment Share on other sites More sharing options...
Simon46 Posted September 16, 2015 Author Share Posted September 16, 2015 Already been in trouble for that too. And im a domestic appliance engineer! 1 Link to comment Share on other sites More sharing options...
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