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Old 01-21-2013, 06:10 AM   #1
Jim Moore OP
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Genuine Buddy 125 Final Drive Questions

HI folks,

I have an opportunity to buy a GB125 for cheap. It starts, but doesn't run. It also has a trashed final drive. "Trashed" as in grinding noises and metal in the FD oil. I've never dug into a scooter final drive before, but I've watched a few videos. I assume I will have to replace everything that turns or rotates in the final drive. I haven't had any luck finding an online fiche. Any idea how much $$ I'm looking at to replace all the bearings and gears? Any special tools required?

Thanks,
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Old 01-21-2013, 06:13 AM   #2
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Originally Posted by Jim Moore View Post
HI folks,

I have an opportunity to buy a GB125 for cheap. It starts, but doesn't run. It also has a trashed final drive. "Trashed" as in grinding noises and metal in the FD oil. I've never dug into a scooter final drive before, but I've watched a few videos. I assume I will have to replace everything that turns or rotates in the final drive. I haven't had any luck finding an online fiche. Any idea how much $$ I'm looking at to replace all the bearings and gears? Any special tools required?

Thanks,
You might be better off sourcing an insurance totalled Buddy and just doing an engine/driveline transplant. They're out there!
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Old 01-21-2013, 06:36 AM   #3
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I thought about that. I saw one on eBay for $900. Thta's way too much for this project. I'm hoping to spend $100 or so on parts. I'm not interested if I can't do it for that.
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Old 01-21-2013, 06:49 AM   #4
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I thought about that. I saw one on eBay for $900. Thta's way too much for this project. I'm hoping to spend $100 or so on parts. I'm not interested if I can't do it for that.
Maybe call Genuine directly in Chicago....?
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Old 01-21-2013, 06:59 AM   #5
Jim Moore OP
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OK, I found an online fiche. Looks like about $200 worth of parts. Interesting. Looks like I'll get to use my bearing puller. Anyone know if the gears need to be pressed?
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Old 01-21-2013, 09:26 AM   #6
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May want to try modernbuddy.com forums.

Also, the parts may be swappable with aftermarket GY6 bits which could save some money as well.
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Old 01-21-2013, 09:48 AM   #7
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Thanks. I see the term GY6 alot, mainly referring to engines. What is a GY6 exactly?
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Old 01-21-2013, 09:58 AM   #8
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The basic aircooled platform of scooter engine from 125cc to 150cc(Buddy 170cc is now even bigger). There are different versions of the GY6 so parts have to be confirmed before purchasing and swapping since there are several derivatives.
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Old 01-21-2013, 05:52 PM   #9
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Be careful; on real Honda scooters, if the needle bearings are trashed, you need to replace half the engine case (the needle bearings are not replaceable). Call that a "worst-case" scenario!
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Old 01-21-2013, 07:49 PM   #10
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The gears do not need to be pressed in.
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Old 01-22-2013, 06:48 AM   #11
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Thanks for the info guys. I'll let you know what happens.
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Old 01-30-2013, 10:44 AM   #12
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Try www.scooterwest.com or www.scooterworks.com. Scooter Works is the same company that distributes the Buddy 125. These are the best locations I have found and use them on my Buddy 125. Interesting, never heard a drive train being toast. My has been a real work house for over 14,000 miles.
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Old 01-30-2013, 10:56 AM   #13
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Thanks again. I kinda got the it was run without rear drive oil, or it was never checked. The whole thing is fishy, but I can live with fishy for super-cheap.
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Old 01-30-2013, 12:59 PM   #14
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I've seen a few scooters with final drive failures. A lot of them had crappy bearings put in at the factory, and there are some that have obviously been under water at some point. One thing you want to make sure of before ordering parts is that when the rear end self distructed the bearings and gears didn't take chunks of engine case with them. That's expensive.
Also, sometimes people think the final drive is toast and when you open it up you find out that a clutch shoe broke or the variator froze on the crankshaft.

When you pull the bearings, note the sizes and try to replace them with German or Japanese bearings. We use a brand called Nachi and have had very good luck with them.

Freeze the bearings and they will slide right in where they should.
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Old 01-31-2013, 07:09 PM   #15
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If the transmission ate the end of the crankshaft you may need a $900 transplant motor. Go for it and tell us the result!
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