Rotax Raptor Posted January 4, 2010 Report Share Posted January 4, 2010 If my porting broke through into my water jacket, can I epoxy that through the jacket? Quote Link to comment Share on other sites More sharing options...
Burt Reynolds Posted January 4, 2010 Report Share Posted January 4, 2010 I have done some crazy stuff with jb weld that never broke,how big of a spot are we talking? You are going to get 50 people telling you jb weld wont work,If you use the good kind,and do it right,it should work. Quote Link to comment Share on other sites More sharing options...
Rotax Raptor Posted January 6, 2010 Author Report Share Posted January 6, 2010 I have done some crazy stuff with jb weld that never broke,how big of a spot are we talking? You are going to get 50 people telling you jb weld wont work,If you use the good kind,and do it right,it should work. The hole very small. You see some daylight looking down through the water jacket into the intake. I've already put some jb weld down into the water jacket and left it about 1/4" thick at that point. I think it will work fine. Thanks for your thoughts! Quote Link to comment Share on other sites More sharing options...
madjimmax Posted January 6, 2010 Report Share Posted January 6, 2010 (edited) Thats a helluva risk your taking if by any chance that decides to break loose while you at wot your are risking hydrolock and if this happen its going to cost you a lot more then just a new jug. I guess that makes me one of the 50 people thats going to say dont risk it. Next time let one of the site sponsers do your port work for you. Unless you are an engine builder yourself, but by the sound of things your not. The 250 to 350 you would of spent on a port job would of saved you a lot of time and trouble.And try to remember it might not leak when first filled but once it heats up while riding it creates a lot of pressure in the cooling system and this is where your problems are going to start. Edited January 6, 2010 by madjimmax Quote Link to comment Share on other sites More sharing options...
Rotax Raptor Posted January 6, 2010 Author Report Share Posted January 6, 2010 Thats a helluva risk your taking if by any chance that decides to break loose while you at wot your are risking hydrolock and if this happen its going to cost you a lot more then just a new jug. I guess that makes me one of the 50 people thats going to say dont risk it. Next time let one of the site sponsers do your port work for you. Unless you are an engine builder yourself, but by the sound of things your not. The 250 to 350 you would of spent on a port job would of saved you a lot of time and trouble.And try to remember it might not leak when first filled but once it heats up while riding it creates a lot of pressure in the cooling system and this is where your problems are going to start. Thanks for your thoughts. I agree with buying a new one if the person is willing to spend the cash. This guy wanted to try some other options with no guarantee. I do build engines and have never seen this. I don't do port work. And, these cylinders were ported by company (starts with a T) about 4 years ago and just started leaking. Don't assume your fellow HQers are dumb asses! Quote Link to comment Share on other sites More sharing options...
madjimmax Posted January 7, 2010 Report Share Posted January 7, 2010 (edited) Nobody was assuming you are a dumb ass I was just giving you the opinion that you asked for. If indeed I thought that you was a dumb ass I would of started the post hey dumb ass. I'm sorry that you thought you sounded like a dumb ass once you read it but by no means is that what I meant. Sorry Dude Edited January 7, 2010 by madjimmax Quote Link to comment Share on other sites More sharing options...
fastbanshee8 Posted January 7, 2010 Report Share Posted January 7, 2010 JB Weld will not hold up to gas, and two stroke oil. I've tried it on a carb cap, and it lasts about an hour, at best. A friend of mine that builds engines has used some epoxy before to repair two stroke cases, but I don't know the name brand, but I do know it was for concrete, and steel, if that helps any. Quote Link to comment Share on other sites More sharing options...
camatv Posted January 8, 2010 Report Share Posted January 8, 2010 devcon might hold it. bad part is if the tops of the intakes are that thin it will probably start seaping in other spots. i'd just get cylinders its not worth the issues' ( now if your just gonna trade it in to a stealership then HEY!@) Quote Link to comment Share on other sites More sharing options...
shawn941 Posted January 8, 2010 Report Share Posted January 8, 2010 JB Weld will not hold up to gas, and two stroke oil. I've tried it on a carb cap, and it lasts about an hour, at best. A friend of mine that builds engines has used some epoxy before to repair two stroke cases, but I don't know the name brand, but I do know it was for concrete, and steel, if that helps any. yes,,,jb weld wont hold up to gas and premix,,,,i know first hand because i have a crack in the btm of my case and the jb weld held up great,,,till i had a gas leak one day,,,,had to redo the whole thing,,,,,, Quote Link to comment Share on other sites More sharing options...
Rotax Raptor Posted January 9, 2010 Author Report Share Posted January 9, 2010 yes,,,jb weld wont hold up to gas and premix,,,,i know first hand because i have a crack in the btm of my case and the jb weld held up great,,,till i had a gas leak one day,,,,had to redo the whole thing,,,,,, Thanks for all of your advise. This guy wanted to try something rather than replace a polished cylinder. I'm bidding on a couple sets on eBay and will send them out for porting. I've heard a lot about Dave Moore racing, any comments? Quote Link to comment Share on other sites More sharing options...
Rotax Raptor Posted January 9, 2010 Author Report Share Posted January 9, 2010 yes,,,jb weld wont hold up to gas and premix,,,,i know first hand because i have a crack in the btm of my case and the jb weld held up great,,,till i had a gas leak one day,,,,had to redo the whole thing,,,,,, Thanks for all of your advise. This guy wanted to try something rather than replace a polished cylinder. I'm bidding on a couple sets on eBay and will send them out for porting. I've heard a lot about Dave Moore racing, any comments? Madjimmax, were cool. Thanks for your help. Quote Link to comment Share on other sites More sharing options...
broncbob Posted January 9, 2010 Report Share Posted January 9, 2010 I'm not sure why you guys have trouble with JB weld holding up to a gas/oil mix? It has all ways worked for me. I have repaired a few gas tanks holding straight gas, pre-mix, and even diesel. The key to getting it to make a good repair it surface prep. You need to clean it very well, and rough the areas up. Then you need to mix it as instructed, and apply and let cure for at least 24 hours. Longer if you have made a thick joint. After all, JB is a epoxy, and what do you think port work on car and 4 stroke heads are done with? Yep epoxy, and even JB weld. Quote Link to comment Share on other sites More sharing options...
bebetekbanshee358 Posted January 9, 2010 Report Share Posted January 9, 2010 i agree 100% percent with broncbob.. the key is surface prep.. and yes all master engine builders that do p[orting use epoxy...the key is finding an epoxy that will expand and contract with your specific metal.. devcon is the shit. its aluiminum based.. i used it on my honda projects.. the b16s and gsrs... w cut 3 inch studs on aluminum. drill about 3 holes around the cylinder area from the block.. and use devcon and the studs to fillthe holes.. they work like a benson sleeve... boosted 30-36 psi and never had a problem on a stock sleeve block..........the shit works.. just do it right.. first before any though.. if its aluminum try to have it tig welded just to cover some of the hole.. and then smooth it out with the epoxy Quote Link to comment Share on other sites More sharing options...
papa_smurf49319 Posted January 10, 2010 Report Share Posted January 10, 2010 JB weld will resist gas just fine, have repaired many tiny pinholes on gastanks with the good old jb cold weld. Quote Link to comment Share on other sites More sharing options...
dusty_v141 Posted January 10, 2010 Report Share Posted January 10, 2010 My dad and I had too build gas tanks for our lambo kit car and we had some pin holes so my Dad sealed it with jb weld.He driped a little inside the tank on accident and after setting a few weeks with gas in it we had too take some parts off the car and you could not make a mark on the jb weld in the tank with screw driver, so if you prep it good it would up too gas. Quote Link to comment Share on other sites More sharing options...
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