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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: View topic - 1965 honda 50


1965 honda 50

 
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jn1972
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Joined: Jul 25, 2017
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PostPosted: Tue Jul 25, 2017 9:11 am    Post subject: 1965 honda 50 Reply with quote

I have a 1965 Honda 50 c102 that was in a chicken coop since 1970,i got the bike to run but it would not shift ,I pulled the clutch side cover I can not get the shift drum to move ,tried pentrant but still no luck would anyone have any other ideas how to free it up thanks jerry
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spurlock
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Joined: Jul 08, 2014
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Location: Vacaville, CA

PostPosted: Tue Jul 25, 2017 10:20 am    Post subject: Reply with quote

That seems unusual to have the shift drum frozen like that, but after 47 years in a chicken coop anything is possible! Are you sure it is the shift drum that will not move, rather than the shift spindle or clutch release mechanism?

If the drum is actually stuck you might try removing the sprocket cover, then the rubber plug just behind the neutral switch. Under the plug there will be a bolt and washer holding the left end of the shift drum in place. Try turning the bolt (gently, it's only a 6mm bolt and you don't want to risk breaking it off). If no go, then you can pull the bolt, then try tapping the shift drum alternately on each end to see if it will free up. Be careful to tap very lightly on the left end, since if you do move the drum very far to the right it would be possible to bend a shift fork. You just want to unstick it. Good luck, and welcome to VJMOG. Let us know how you make out.

-Bill

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1975 Honda CB125S
1975 Honda XL250K2
1989 Honda NX250
1989 Honda GB500tt
1990 Honda GB500tt
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jn1972
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Joined: Jul 25, 2017
Posts: 3

PostPosted: Wed Jul 26, 2017 6:23 am    Post subject: honda 50 Reply with quote

hello, I tried to spin the shift drum with the 6mm bolt but it would not budge,the bike is stuck in 3rd gear.i even tried spinning the back wheel while trying to move the shifter but it is stuck are there any other things I could try thanks jerry
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spurlock
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Joined: Jul 08, 2014
Posts: 773
Location: Vacaville, CA

PostPosted: Wed Jul 26, 2017 6:32 am    Post subject: Reply with quote

Did you try removing the bolt and tapping the drum very slightly side to side? If that does not work there is probably something bent/broken inside the transmission.

-Bill

_________________
1975 Honda CB125S
1975 Honda XL250K2
1989 Honda NX250
1989 Honda GB500tt
1990 Honda GB500tt
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jn1972
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Joined: Jul 25, 2017
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PostPosted: Wed Jul 26, 2017 2:15 pm    Post subject: Honda 50 Reply with quote

I tried tapping the drum from side to side still no luck,maybe that is why it was parked 40 years ago.from what I read the next step would be to break apart the cases is this something that can be done by a backyard mechanic? Someone suggested a replacement engine made in China ,but I am not sure I would like to go that route ,has anyone used one of these? Thanks for all the help
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spurlock
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Posts: 773
Location: Vacaville, CA

PostPosted: Wed Jul 26, 2017 2:27 pm    Post subject: Reply with quote

Just depends on your abilities and tools. They are fairly simple engines, but the biggest problem for someone unfamiliar with a particular engine might be recognizing what parts have damage. If you are going to tear it down you want to make sure you can recognize problems and not put bad parts back in again. You will need a puller for the flywheel, an impact driver with proper JIS cross head bits, a complete gasket set plus new oil seals, and you will need to pay close attention to how it all comes apart. Plenty of photographs during disassembly and a decent manual will help. There are parts schematics online at places like Partzilla.com. The transmission will have several small thrust washers that need to go back in the right locations.

-Bill

_________________
1975 Honda CB125S
1975 Honda XL250K2
1989 Honda NX250
1989 Honda GB500tt
1990 Honda GB500tt
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