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I am still trying to figure out how not screwing in the drain plug had anything to do with the magnet coming loose. Anyhow seems to be a mystery.
Would like to see a picture of the drain plug though.
Originally Posted by Rocking_it
Thought I was the only one confused.
I think he meant to say he screwed the drain plug all the way in. Not knowing that the drain plug is a pipe thread plug, and should only be screwed in until slightly snug.
He screwed it in way too far, and the magnet got knocked off of the plug at startup.
I picked up a Clymer manual. The toque specs were listed in the “supplemental” section all the way in the back of the book. Toque specs for primary cover is 108-120 in. Lbs. lowest mine goes is 20 ft. Lbs. can’t believe it’s that light
5 speed or 6 speed? I use tq wrench on 6 speed, but I never do on 5 speeds. Not saying that is right. But I use good dope on 5 speeds.
it’s a 5spd. I picked up a Clymer manual and the torque rating was listed in the “supplemental” section all the way in the back of the book. It’s a torque rating of 108-120 in. Lbs. Lowest my torque wrench goes is 20 ft. Lbs of course. Can’t believe it’s that light.
What’s the torque spec for the primary cover? Google says 9 foot pounds? That seems really light to me. Lois my toque wrench goes is 20
108 to 120 inch pounds You also need to follow the torque sequence. Get yourself a service manual and the correct tools if you are going to work on your bike.
108 to 120 inch pounds You also need to follow the torque sequence. Get yourself a service manual and the correct tools if you are going to work on your bike.
And some helicoils or timeserts with that torque..
Went and looked up the part number, so I could better understand what the OP did. 739A.
Then went and looked for pictures of it.
Now I get it. It's a tapered pipe plug, and the OP managed to run it (or an aftermarket piece) up into the hole, and right on past the sealed point, jamming the magnet into the chain. Got it.
Begs the question of how he did it, and what the repair will/should be. The primary case should have a matching tapered thread, to match up with the plugs taper. Yea, the threads in the aluminum cover can be progressively boogered by repeatedly overtightening the drain plug. That would allow the plug to go too far inside. It's also possible the plug the OP has is not tapered.
Aftermarket doesn't always get it right. Like this one:
So, were it my bike, I'd pull the primary cover in order to get the magnet out and assess any damage (likely nothing critical, but if it's been pulverized, it can hang out around the stator).
Then I would examine the primary cover. First for cracks at the plug hole, and then to see if the plug hole has been oversized, either of which is likely. I probably wouldn't fix the damaged cover, especially if it's cracked. Primary covers are almost a dime a dozen here at swap meets and online. I'd probably simply replace it.
I'd also look at the primary cover and ponder not so much a thread insert (which for pipe threads isn't fun), but for something like gasketed straight plug, an expandable plug, etc. This would only be if the threads and taper were destroyed, not if it was cracked.
But, if I already had a threadsert tool kit, for the cost of some tapered inserts I likely would try to repair it. Or if I wanted to use it as an excuse to buy a threadsert kit, I'd now have one.
Last edited by foxtrapper; Jun 28, 2025 at 07:32 AM.
108 to 120 inch pounds You also need to follow the torque sequence. Get yourself a service manual and the correct tools if you are going to work on your bike.
Exactly! Guessing how to do something on these projects never has a good outcome. A 10 second read would have avoided this screw up.
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