May 15, 200719 yr 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?
May 15, 200719 yr Yea, and it is not good on a stressed component! Edited May 15, 200719 yr by copemech
May 23, 200719 yr Author Yea, and it is not good on a stressed component! What was the application in your experience and how were the surfaces prepared?
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