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Danonymoose |
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Danonymoose Derestricted Danger
Joined: 03 Aug 2019 Karma :
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Posted: 10:05 - 18 Aug 2019 Post subject: Aprilia RS125 Damaged Crankshaft |
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Hi.
I recently posted with some issues with my 122 engined '05 RS125. I thought the issues were to do with the carb/fueling. Boy, was I wrong.
After getting a break in the bad weather recently, I've been able to start fault finding on the bike again. I figured that the bike was, indeed, getting fuel, and it seemed to be an ignition/spark problem.
The spark was okay, but not the best I've seen. I started testing the electrical components one by one. Ignition switch? Fine. Coil/lead/cap? Fine. CDI/ICU? Fine. I finally got down to the pickup. I took it off, cleaned it up, tested it, and it was fine. However when I took the pickup off, I noticed the air gap was pretty large. So upon refitting it, I got my feeler guage out and made the sure it was gapped properly. Lo and behold, a decent spark! Or, at least, it was much better than before, if still not perfect.
Anyway, I noticed that the stator cover was pretty dirty. I decided to remove it to give it a good clean. Welll... This is when I noticed that something wasn't right. After removing the cover, I decided to also remove the stator itself. This is when my world came crumbling down around me.
The woodruff key was lying on it's side in what was once the slot that it fits in on the end of the shaft. It looks as though it's somehow wriggled loose, and has eroded away at its home in the shaft, leaving a half moon shaped pit where the slot originally was.
Does anyone have any experience with issues like this? I've been searching online, and while there are plenty of places that offer crank rebuilding, this only really seems to cover seals and bearings etc. and not work on the actual crankshaft itself.
I can throw some pictures up later to show exactly what I mean, if needed.
Cheers |
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- Super Spammer
Joined: 22 Oct 2013 Karma :
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Posted: 10:21 - 18 Aug 2019 Post subject: |
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Talk to a Pro like PJME... I doubt that will be repairable, but if it is, they'll know or be able to source a replacement crank.
https://www.pjme.co.uk/acatalog/Aprilia_RS125_Engine_Bottom_End_.html ____________________ TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG. |
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redeem ouzzer |
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redeem ouzzer World Chat Champion
Joined: 06 Oct 2015 Karma :
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Riejufixing |
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Riejufixing World Chat Champion
Joined: 24 Jun 2018 Karma :
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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Riejufixing |
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Riejufixing World Chat Champion
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 13:28 - 18 Aug 2019 Post subject: |
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Put up some pics. Odds-on that the broken key has chewed up the taper a bit. How fixable it is depends on the amount of damage. Quite often all that is required is a small clean-up and a new woodruff key. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 13:54 - 18 Aug 2019 Post subject: |
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If you're lucky, you'll be able to lap the flywheel back against the taper and fit a new key.
As above, Key steel is usually a LOT softer than the steel of the crank. Woodroffe keys are usually half-moon shaped anyway.
Check for play on the end of the crank (grab the end and wiggle it up and down and in and out, it shouldn't move). I've seen flywheels spin-up or altered pickup clearance (on older bikes, broken points baseplates) because of play in the main bearings. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Riejufixing |
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Riejufixing World Chat Champion
Joined: 24 Jun 2018 Karma :
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Posted: 14:16 - 18 Aug 2019 Post subject: |
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Needs pics, as he said. I can't reconcile "The woodruff key was lying on it's side in what was once the slot that it fits in on the end of the shaft. It looks as though it's somehow wriggled loose, and has eroded away at its home in the shaft, leaving a half moon shaped pit where the slot originally was" with an undamaged key seat (and possibly a knackered key slot in the rotor).
PIC, Danonymoose, pics! |
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 14:22 - 18 Aug 2019 Post subject: |
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I've seen moon-crater-like damage from a busted key. Much depends on the extent of the damage. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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Danonymoose |
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Danonymoose Derestricted Danger
Joined: 03 Aug 2019 Karma :
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Danonymoose |
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Danonymoose Derestricted Danger
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Riejufixing |
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Riejufixing World Chat Champion
Joined: 24 Jun 2018 Karma :
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Posted: 15:07 - 18 Aug 2019 Post subject: |
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Mmm, lovely. Eurgh!
Go back to post "Posted: 11:41 - 18 Aug 2019"!
Edit: What damage to the generator rotor? |
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Danonymoose |
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Danonymoose Derestricted Danger
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Posted: 15:16 - 18 Aug 2019 Post subject: |
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Riejufixing wrote: |
Mmm, lovely. Eurgh!
Go back to post "Posted: 11:41 - 18 Aug 2019"!
Edit: What damage to the generator rotor? |
Sorry, I thought I'd already replied to that comment.
I'll be making some phone calls tomorrow to see who can do what.
I don't know what damage has been done to the rotor. In all honesty, I don't know what I'm looking for, damage wise. |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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Danonymoose |
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Danonymoose Derestricted Danger
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Riejufixing |
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Riejufixing World Chat Champion
Joined: 24 Jun 2018 Karma :
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Riejufixing |
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Riejufixing World Chat Champion
Joined: 24 Jun 2018 Karma :
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Posted: 15:38 - 18 Aug 2019 Post subject: |
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 15:46 - 18 Aug 2019 Post subject: |
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If you want to box that up and send it to me I will "try" to weld it up and make a new keyslot, then straighten the taper well enough so that it will run the rotor true. I expect that the rotor is also fairly well battered.
Actually if you send me the crank and the rotor I could try cutting a new keyway in both in a different location. You got nothing to lose. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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Riejufixing |
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Riejufixing World Chat Champion
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Polarbear |
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Polarbear Super Spammer
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Danonymoose |
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Danonymoose Derestricted Danger
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redeem ouzzer |
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redeem ouzzer World Chat Champion
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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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Posted: 22:11 - 18 Aug 2019 Post subject: |
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I don't suppose my usual "a dab of JB Weld will sort that right out" will help...
...I'll get my coat ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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Old Thread Alert!
The last post was made 4 years, 224 days ago. Instead of replying here, would creating a new thread be more useful? |
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