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Junior Member
XB12r gearbox parts.
Hi all.
I am looking to source a new shifter drum and forks.
My 2008 XB12r (newer spec motor) jumps out of 3rd gear on occasion and i'm fairly sure it is down to a worn drum/fork combination.
Living in Ireland I am not exactly spoiled for choice on parts...
Does anybody here have the necessary parts or can you offer any advice on where I might source them?
I have been keeping an eye on EBAY but found nothing reasonable yet...
Thank you
Aidan
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Senior Member
Try St.Paul, New Castle or Surdyk Harley Davidson. Look them up online and order new parts.
Prior to ordering new parts I would suggest disassembling the transmission. This requires pretty much disassembling the entire motor in order to split the cases. Once you’ve accomplished that inspect the transmission components. Chances are the shift drum is fine.
My bike had a slight skip in 3rd gear and after inspecting the transmission components I needed to replace 3rd gear, 5th gear, the shift forks and the associated shift dogs for the gears I was replacing. I think that’s exactly how it worked.
Download a service manual at www.buellmods.com and study the transmission section so you can see which gears and shift gods effect each other when engaged.
Good luck with the rebuild.
In your situation you might be better off finding a low mileage crashed bike and swapping motors.
Last edited by Chicknstripn; 10-12-2018 at 02:41 PM.
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Junior Member
Thanks, great info there, much appreciated.
I had hoped to have all the parts necessary ready before beginning the tear down, but reading your comments probably best to wait til I assess the problem before ordering parts blind.
I was a motorbike mechanic for 15 years so I know what i'm getting myself in for. Also apart from the gearbox issue it is a good healthy low mileage motor.
With that in mind I can't justify just replacing it, especially given the price of shipping and taxes involved in bringing a complete motor in from the states. ( very little chance of finding a motor closer to home) Also who knows what problems may come with a second hand motor...
I think I'll go down the route of stripping her down and taking it from there.
Any more input is welcome too, especially in regard to options for parts once I have it stripped and checked.
I have found a place in Holland www.twinmotorcycles.nl who can supply parts too.
Keep it sunny side up.
Aidan
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Senior Member
Twinmotos is a great place for anything Buell. They have A TON of helpful vids online and are a wealth of Buell knowledge.
I consider myself an absolute novice mechanic and I had no issues with tear down and rebuild of my engine. I went the rebuild route for almost the same reasons as you..... only thing I needed help with was using an arbor press and the necessary tooling to remove the transmission from the left crankcase(I think it was the left). Anyway, my local HD was pretty cool and pressed it out for me, free of charge.
Search the net as much as you can. I’m pretty sure some guys have gone DIY on pressing the transmission out of the crankcase.
Whatever you do, do not use impact tools to disassemble or assemble anything drivetrain/transmission related. That could cause additional damage.
Good luck.
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Good advise from Chicken (as usual )
Neither the shift drum nor the shift forks are meant to hold the trans in gear. The undercut in the dogs does that, so popping out of gear is typically worn dogs on the side of the gear and a pretty common problem for the 2-3 gears.
These guys are across the pond from you in Florida USA
https://www.yelp.com/biz/r-and-d-motorsports-clearwater.
1632 N Hercules Ave
Bldg G
Clearwater, FL 33765
Phone number (727) 447-4552
Business websiter-dmotorsports.com
They're super smart and can supply you what you need and even just re-machine the dogs on the gears you have if shipping (x2) is a better option than buying new stuff from sphdonline.com
Last edited by Cooter; 10-12-2018 at 05:15 PM.
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Senior Member
Good video an explanation.
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Senior Member
Kevin has a lot of great vids on how motorcycles work.
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Senior Member
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Junior Member
Thanks for all the replies folks.
As usual the true damage will probably be a mix of all the above.
I would just like to point out a few things.
Damage dogs are usually caused by incorrect shift drum action, whether due to worn or bent forks/drum or other issue.
This then results in power being transmitted through the dogs while only a small contact area has been achieved. Resulting in chipping or wearing of the dog surfaces.
My bike instantly pops back into gear after popping out and will then stay in while power is maintained indicating play in the drum and fork combo. ( with a lot of luck maybe the dogs are useable)
Also the Shifter pawl adjustment issues do not apply to this model firebolt as it does not have the adjustable earlier setup.
Hopefully in the next month i'll have time to get it stripped down and report back on the damage.
Thanks to all.
Aidan
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