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Thread: Urgent service message, tons of white smoke

  1. #91
    apriliaforum expert firemoto's Avatar
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    Tread Hijack!

    HAHAHA Time to hijack the thread!!!!!

    I bought the blown motor from V-twin a number of months back. Nicest guy I never met. (my buddy was passing through Atl and stopped and picked it up form his wife lol).

    So after not having any time to do anything but work, I finally had time to get into the motor a couple weeks ago. Needless to say, the top end of the rear cylinder is trashed with the exception of the cylinder bore which is in good enough shape to hone any marks. Con rod looks good from initial inspection and shouldn't need to be replaced. Cams were not out of time and chain tension was still good upon disassembly. One intake seat completely destroyed and valve hat driven into the runner. One exhaust valve hat completely gone... nowhere to be found... cant find any ferrous metal chunks in the sump (yet). Giant hole in the piston about the size of a quarter dollar.

    So all in all, there is no way to tell exactly what caused the initial valve to drop, but it is safe to say it caused a hell of a lot of damage.

    Im looking into what could possibly be done to the motor to squeeze that little extra out of it. Going to tear the head down to bare and contemplate on having it welded up and re-machining it just for the hell of it, or just finding a used one on eBay (which I already looked up and saw at least one). Cost would be about the same. Ill try and get a couple more pics as I go.

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    '09 Dorsoduro 750
    '95 Kawasaki ZX-6R "project bike"

  2. #92
    apriliaforum expert
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    haha is this that very same blown motor huh?

    nice thread hijack. You should start another thread though with something like "750 motor resurrection"

    would be nice to see your progress over the next weeks, months, years... whatever it takes
    Don't be a jerk... jerk

    2016 KTM 250 xc
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    2009 Dorsoduro 750
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  3. #93
    apriliaforum expert Frodo's Avatar
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    Yes, very much looking forward to this thread!
    Would love to know why the valve dropped.
    Frodo
    2015 Shiver
    New Zealand

  4. #94
    apriliaforum expert maddad's Avatar
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    Yikes Oh wait it'l buff out wont it . Fatiuge somewhere it would be hard to figure which went first .

  5. #95
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    I for one endorse and support this thread hijack. Name:  emot-golfclap.gif
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    And by the way, I never ever saw a piston so damaged before. Looking forward to see how it goes. Best of luck to you.

  6. #96
    apriliaforum expert rule62's Avatar
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    You any good at grinding new cams? Seems like that's where the power is to be gained on our lumps, after much reading of other threads.

    Or... maybe sourcing a crankshaft from the new 900cc and making a 750 stroker. Now that would be fun!

  7. #97
    apriliaforum expert firemoto's Avatar
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    Quote Originally Posted by rule62 View Post
    You any good at grinding new cams? Seems like that's where the power is to be gained on our lumps, after much reading of other threads.

    Or... maybe sourcing a crankshaft from the new 900cc and making a 750 stroker. Now that would be fun!
    I have to admit I am merely a grass hopper in the realm of machining, my Dad is the expert, and he doesnt do anything with grinding cams or cranks. He leaves that to the specialist.

    As far as the stroker idea goes, you'd be very unlikely to change the stroke as the fit of the cylinders is so close to the crank at BDC and very near the top of the bore at TDC. If someone wanted to go another route it would be to see if the 1200 jugs would fit the case of the 750, and doing a full top end swap effectively making a hybrid middle weight.
    '09 Dorsoduro 750
    '95 Kawasaki ZX-6R "project bike"

  8. #98
    apriliaforum expert rule62's Avatar
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    We spoke about that in another thread. I think a base gasket increase of 5mm is what we calculated to clear the difference for the 900 crank.

    Sent from my HTC6500LVW using Tapatalk
    2014 DD 750 ABS - Spark exhaust, Arrow decat, headers (all ceramic coated), BMC filter, FatDuc, BikeMaster DLFP16-BS LiFePO battery, GPR steering damper, DD 1200 fully adjustable rear shock w/spring swap, 2016 Tuono Factory wheels, 15/44 520 conversion (PBR/Superlite/DID), Strada-7 fork preload adjusters, Samco 2-piece hose kit w/clamps, Engine Ice, Renazco Racing seat, EvoTech tidy tail, Aprilia grab handles, shorty levers, crank-case breather mod, evap-can delete... and a Rapid Bike EVO on order...

  9. #99
    apriliaforum expert jay dub's Avatar
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    Never hurts to ask Allen Noland. He's the business when it comes to the xv's. Fukn great guy w/ a heart of gold. He rebuilt my last motor

    You can occasionally find him spitting knowledge in the xv section or check out his fb page---http://www.facebook.com/NolandTransWorldCycle
    acab

  10. #100
    apriliaforum expert vtwin_pilot's Avatar
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    Firemoto, just checking in....any update on the engine rebuild/resurrection?

    As an aside, I found the pic of the whole in my piston quite jarring. There were some serious forces at work in there to tear it up the way it did; I'm just glad my crotch wasn't on the receiving end of any errant flying metal.

    You also confirmed what I was able to glean quickly while I was removing the engine, namely that the cam chain look good, so the failure wasn't due to anything in that area. My next guess was that it might be the con rod, but you've eliminated that too. Anyway, given the size of the hole in the piston, holy sh!t, I can't imagine which loose piece of metal caused it, but it's one unholy mess. I only know that Aprilia had no idea what caused it, and worse, were not interested in either examining it or helping me out one iota.
    Last edited by vtwin_pilot; 11-30-2017 at 11:57 AM.

  11. #101
    apriliaforum expert High Country's Avatar
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    Looks like a valve broke and bounced around in there. Good thing for strong head bolts, eh?
    2009 Aprilia Dosoduro 750 (Adventurized: http://www.apriliaforum.com/forums/a...893274&thumb=1)

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