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#11
09-18-2013, 09:19 PM
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well i just rebuilt my engine in my 1650 and did abunch of general work up front. i fired it up today and had some anoying rattles still so far this is what i found and the hood and grill is not on yet. my throttle cable was hitting the hydro linkage arm. i put some plastic split loom over that. i still had a rattle but when i pushed in on the end of the hydro lever it went away. well when i had things apart i took of teh link going to the spool valve and cleaned it all up. it seems all the gunk and rust was keeping it nice and tight. now it is free and is clattering around. i think i will throw some grease on it and it should quite it down hopefully.
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1979 1650, #1 tiller with one extension, 90 degree box mounted, 3 point. 1961 4 digit bringing back to life. I have the mower and 3 pint for it. The 1650 is the fastest mower in the neighborhood. 
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#12
09-18-2013, 09:32 PM
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Is the noise something new? If it is I'd start looking for things that are loose and remove them one by one and see what happens. The other guys have given you some good ideas to check.
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2264 with 54 GT deck 1641 AKA Black Jack with a 402-E Haban Sickle bar mower JD317 dump truck BX2670 with FEL
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#14
09-21-2013, 02:32 AM
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I would check the engine tin,like the muffler tin and ISO mounts. Could be a loose muffler clamp too. My 1200 was rattling like crazy had some bolts on the muffler box that worked loose.
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Brian April 1979 1200 Quietline 44A deck 1988 1211 customized into a 1288 with a K301AQS 38C deck and a 1864 54” deck . Snow blades 42" and 54" . Brinly disk, brinly plow a cultivator and a $5 brinly yard rake! 
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#15
09-21-2013, 05:48 PM
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I would be concerned about piston slap too. Of course weed out the other things like tin vibrating, etc. too.
Good luck, Bill
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IH Cub Cadet 109 IH Cub Cadet 126 (2) IH Cub Cadet 149 IH Cub Cadet 1650 MTD Cub Cadet LTX1042
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#16
09-21-2013, 10:08 PM
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My 108 started making a metallic knocking noise. pulled the head to find a scored cyl, and lots of fine aluminum in the oil. And badly worn piston skirts. It did start to blow smoke out the breather. It wasn't really smoking out the exhaust like it was burning oil at all.
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#18
09-23-2013, 10:34 AM
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I have a freshly rebuilt 1450 .030 over, new piston & rod that makes the same noise. Really worried me at first and was told they all do it. While the engine was out I did the axle squeeze and ISO mod w/new factory mounts.
My 1250 w/unknown hrs makes the same noises. Rec'd a lengthy reply from a gentleman in WA state who is a retired machinest. He stated he had one w/the same problem and set out to find the source. Seems as though these Kohlers are not all that tight on the tolerances when new. He found that the cam shaft ends and pockets in the block were not true. After lapping the block surfaces, trueing up the cam ends and shimming, it eliminated the noise and stated he has done at least a dozen engines since and that procedure cleared up the noise in each case. Dave S.
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