Dave
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SuzukiSavage.com Rocks!
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Camp Springs, Kentucky
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Yes you can get it welded, and removing the head cover to get it welded will also give you an opportunity to put in a Versy head plug and inspect the cam/rockers for wear.
Or.....you can clean the area really well, then put a heat shrink tube on the through bolt and apply JB Weld to replace the broken area. Put large washers on the end to form the edges of the JB Weld. Position the engine so the broken area is straight up, and then apply the JB Weld to build up the area. JB Weld continues to flow for a considerable length of time, and you may need to use some modeling clay to build up the edges of the repair area to prevent the JB Weld from flowing out of the repair area. After the JB Weld has cured for a full day you can pull the bolt out of the heat shrink tubing, then take a pair of pliers and roll the tubing out of the JB Weld.....as the JB Weld does not stick to the smooth tubing very well. Then take the washers off the side....you may have to heat them up a bit to get the JB Weld to release. Then sand/file/grind the JB Weld to create a decent looking surface, and paint it silver (or use it as-is since the tank and mount will probably hide it). (I did this repair to a Ninja engine that I bought from a crashed bike......and it is still working fine).
Or......you likely can just use it as-is if you are on a budget. The top clamp will still have pretty good hold once the bolt is tightened....and there are 4 other motor mount bolts to hold the engine in the frame.
Or.....you can buy another head cover (although I believe they are machined in a set and should be used as a pair).
NOTE: I would never put a used engine in a bike without taking the head cover off, inspecting the cam/rockers.....or resealing the head plug and the head cover. It is just so much easier to do that when the engine is out of the frame.
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