ssiegmund Posted May 15, 2007 Report Share Posted May 15, 2007 I was going to put the Montesa up for sale because I recently bought a '06 Beta Rev3 250. When getting the Monte ready for sale I discovered a small oil pool on the bike stand, I pulled the skid plate only to find a small hairline crack coming off the top of the 90* corner cast into the case. When I first bought this bike I installed a new chain, spockets, exhaust gaskets, repacked the silencer, new Dunlops, and a new Montesa rubber case cushion, which required straightening of the heavy aftermarket skid plate for clearance. Apparently there was still enought pressure on the case to cause a vibration induced stress crack in the engine case, possibly due to a casting flaw since the bike has never landed hard enough on the skid plate to make me even think there was the slightest chance of case damage. As I see it there are three repair options: 1) New engine case 2) Weld the existing case 3) JB Weld the existing - provided proper preparation and installation techniques are used. I've heard second hand that the JB Weld does a surprisingly good job but I have no first-hand experience. Does anyone have first-hand experience with JB Weld repairs of this nature? Quote Link to comment Share on other sites More sharing options...
copemech Posted May 15, 2007 Report Share Posted May 15, 2007 (edited) Yea, and it is not good on a stressed component! Edited May 15, 2007 by copemech Quote Link to comment Share on other sites More sharing options...
ssiegmund Posted May 23, 2007 Author Report Share Posted May 23, 2007 Yea, and it is not good on a stressed component! What was the application in your experience and how were the surfaces prepared? Quote Link to comment Share on other sites More sharing options...
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