by starcain » Wed Dec 06, 2017 3:44 pm
Chuck, I've been trying to figure this one out for years with no luck. I brought this subject up in an earlier post in the "K,KK,KH,KHK" section under "1952 & 153 K/KK transmission plug". When I was doing my KK many years ago I found that I had 5 transmission drain plugs with two different lengths, 3 long and two short. I had no clue what was correct. Obviously it would make a huge difference in oil level from one to the other. I noticed that the 3 long ones all had damage to the ends of the tube that ended in about the same place on the tube. I had to assume that the long ones had been rubbing up against a gear or something. I ended up using the long one to the far right in the picture because it had the best hex on it and cut it off to the same length as the short ones that I had. None of the short ones showed any signs of wear so I figure that was a safe length. I saved the end I cut off and that's why the far right one in the picture is in two pieces. This spring I drained the transmission and primary oil for the first tine in a long time and found myself wondering again why there is two different lengths? Not knowing for sure which length drain plug gave the correct oil level I put the short one back in and filled with the 1-1/2 pints of oil the riders handbook says to use. After I got the oil filled I removed the small 3720 oil level screw and got almost a half pint of oil back out so if 1-1/2 pints is the correct amount of oil the short plug is not correct. I believe the long one would give you the correct oil level but using a long one just didn't seem like a good idea after seeing the damage on all three long ones I had. The NOS long one in your picture appears to be even longer then my three? I never got any comments or feedback to my post so it's still a mystery to me. Would like to know though if anyone else has dealt with this issue.
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