Seat locks repair comments  By  bobf (Read 2,598 times)

I would being interested in how you fix it I got my scoot February 2011 and the rear latch has never worked, only the side latch works, Bob I'm glad your doing better hope your on the road soon, take care.
Richard

First thing to do is be prepared for a tear down of the rear half. You need to get to both the front and side latches. Would suggest that you remove them, take off the cables, make sure that all the cams are really free and not dragging. I won't have time right now but I intend to do a write up with pictures on how to do the tear down. For you it might be a job for off season activity.

Damin69 has a good idea about pushing down on the rear of the seat just a bit faster than the side. As I was sitting there and constantly pushing down the seat I finally figured out the methodology of the second cable and the rear latch.

As the side bar on the seat enters the latch it pushes the latch part to the side and that pulls the cable that goes to the rear latch and releases the locking part on the rear latch. So if the side bar enters too quickly it may release the lock before the rear bar gets there and it can not enter at all. The rear down first motion may save you from a tear down.

I will do the tear down with comments, just don't know when. I will have the comments and photos of the latch areas soon.
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2008 MC 54 250B, Jonway 244cc, built by Shanghai JMStar Motorcycle Company

The location and repair of the lock not working problem.

As I worked on this problem for a week I tried different ways to fix what I thought was the problem.

1. First was to reinforce the cable holding fingers on the side latch assembly. After shutting and noticing that the rear latch was not catching the seat I noticed that the fingers were getting bent further toward the middle of the side latch. So I bent them back and reinstalled on the frame. That did not work but for a closing or two. Then no more latching at the back and often I had to use a long screw driver under the seat to release the side latch.

2. Next I determined to reinforce those tabs by adding some heavier steel to stop the bending. I used some spare file key lock pawls and glued them on with JB weld. One on the outside as shown and another on the inside where the cable guide is mounted. Seemed like a good idea but still the latch works sometimes and fails other times continued. That is a slow fix as each time I use JB weld it takes 24 hours till usage for maximum strength.



3. Then I noticed that the side latch was slow to respond to the turn of the key. Often not working and sometimes works on the second or third effort. Usually I had to work under the seat with a long screwdriver to release the seat.

So, again, I took the side latch assembly off and removed the spring, and both cables. Now I could freely swing the mechanical parts, but the one element was not free as I expected it to be. This I could see had been dragging on the upright part of the assembly as it was becoming scratched. I took a heavy screwdriver and put it under the part that was dragging and lift it a bit. Now that element was free to go where it needed to go. So I then sprayed graphite lube into both the side and rear latches.



4. Successful test next. I reinstalled the latch assembly with both cables now attached. I closed the seat, both side and rear latches caught. Turned the key and the seat popped up. Repeated this many times with no failures. Went to bed and restarted the testing this morning with still no failures. It seems to be fixed.

5. In the process of reinstalling all the plastic parts, the battery, the lights on the rear, and finally the outside skin. When that is completed I will be able to install the seat and trunk. Then it should all be set to go riding again. Final test will be to lock the seat and determine that the latches are working fine.

6. Finished assembly today, finally. I have had the covers on and off several times yesterday and today. I dropped a nut and could not find it with my eye's, my magnet, my wife's eyes. Had to go to Lowe's for a matching nut. Then found that a slip on speed nut was missing, back to Lowe's for some of those. Today I dropped a screw and could not find that so back to Lowe's for that. Now I have the machine together and some spare parts.

7. How the latch works. As the loop on the bottom of the seat enters the side latch it pulls the front to back cable and that allows the back latch to lock. So it is important to make sure the back loop is entering the rear latch as, or before, the side loop enters the side latch. So I found that pulling the rear part of the seat down smartly does make the latches more reliable. Much better latch today. Sometimes might miss the back latch but one more effort seems to work.






The red arrows indicate direction of the cables when locking. When the key is turned it reverses the cable action and pulls the side latch locking component toward the front to unlatch it and that then allows the spring on the rear latch enough slack for it to unlock.

This is only for the latch look see and repair. I will also post the machine tear down photo's later.

I finally got a photo to post so I may have corrected myself.
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looking at those frame piping I wish I could rebuild these scooters using aluminium piping and save on weight.