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Dirt Bike Mods & Maintenance
connecting rod failure diagnosis: eric??
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[QUOTE="EricGorr, post: 148074, member: 19611"] Sounds like a classic case of "pinched crank". Installing a new crank is a delicate matter. I use this method; 1) Get a chunk of aluminum rod stock that is near the same diameter as the outside diameter as the main bearing's iinner race. 2) Heat the aluminum with a propane torch for 5 minutes. Place the piece on the inner bearing race in order to transfer the heat and expand the race. 3) Ooops I forgot to mention to put the crankshaft in the freezer for 5 hours first so it contracts. 4) With the crank journals contracted and the bearing race expanded the crankshaft should drop into the right side main bearing without any trama. 5) Repeat the bearing race heating procedure for the left side case. 6) Kaw makes a special tool that wedges and supports the inside of any crank so the flyweights don't shift out of parallel during installation. We call that "pinching" or "wedging". 7) Now try to install the left side case onto the crank. I prefer to use the Suzuki crank tool which allows you to draw-on the case half without impacting the crank. 8) Once the cases are bolted together, the Suzuki draw-on tool and a case-splitter can be used alternately to align the crank in the cases. Use a feeler gage to measure the gap between the flyweights and the cases. 9) Aligning the crank in the cases also serves to reduce the side load on the main bearings and reduces break-in tiime plus insures durability. I demonstrate this method of crank installation in my Two-Stroke Engine Rebuilding video, its the best $25 investment you'll make in your home workshop. Regarding Kaw cranks, I don't think they could find a cheaper bearing to hang on the big end. My suggestion, have someone rebuild it with a Hot Rod kit. That bearing is far superior to any OEM alternative and the rod is forged rather than cast like OEM or IMS rods. I know its tempting with Kaws just to replace parts like the crank and cylinder because they're so cheap, but thats 2-fold and you really get what you pay for. Good luck, Eric:) [/QUOTE]
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connecting rod failure diagnosis: eric??
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