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daftgeorge
Joined: 22 Sep 2014 Posts: 10 Location: Nottingham UK
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Posted: Tue Apr 19, 2016 10:26 pm Post subject: piston broke |
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Hi Guys, had my Vdue for about 2 years and had no issues , its been perfect! Last Sunday holed a piston on top pot. I was FLAT out for a very long time before it popped. Oil feed still there and never got over hot. Didnt seize.Bore appears ok apart from a bit of aluminium pick up above the top ring from molten metal.This is normally caused by incorrect ignition timing but other pot fine.
Is this a know problem? Any ideas guys please?[/url] |
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trev45
Joined: 15 Jun 2011 Posts: 449 Location: Sydney Australia
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Posted: Wed Apr 20, 2016 9:49 am Post subject: |
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Old or new stile heads ?
Trev |
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daftgeorge
Joined: 22 Sep 2014 Posts: 10 Location: Nottingham UK
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Posted: Wed Apr 20, 2016 10:33 am Post subject: |
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Hi Trev, simple answer "I don't know". Bike is Steve Knowles old one (Homer Simpson?). Its an evolution with carbs on an 03 plate. Head is held on with 7No. allen bolts and has two "o" ring seals.
Is this new or old style and would it make a difference?
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trev45
Joined: 15 Jun 2011 Posts: 449 Location: Sydney Australia
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Posted: Wed Apr 20, 2016 1:54 pm Post subject: |
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Lets say late heads the late heads are different in the chamber shape.
Has it got the after market FTR ignition plate ?
It is adjustable and maybe out ?
Trev |
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daftgeorge
Joined: 22 Sep 2014 Posts: 10 Location: Nottingham UK
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Posted: Wed Apr 20, 2016 3:07 pm Post subject: |
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Hi again , I will have to check, first time I have had the fairing off cos I have had no need. I will check if it is adjustable , good call!.However if the cylinders are not individually adjustable probably not as other pot shows no bad signs? |
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trev45
Joined: 15 Jun 2011 Posts: 449 Location: Sydney Australia
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Posted: Wed Apr 20, 2016 11:39 pm Post subject: |
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There is different jetting on bother cylinders
Was it the top or bottom piston that went ?
Trrev |
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daftgeorge
Joined: 22 Sep 2014 Posts: 10 Location: Nottingham UK
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Posted: Tue Apr 26, 2016 10:14 pm Post subject: |
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Hi again Trev, sorry for delay in reply,been to Jerez for motogp over the weekend.
Its the top of the piston in the centre but nearer the exhaust port.
Now got other head off to have a look and its perfect if anything running slightly rich. Also got barrel , piston and little end off the bad pot,
Luckily the bore looks perfect with no scores. there was globules of aluminium resting in the reeds on the inlet side which i have removed and cleaned out.
Still at a loss to understand why the holing as i haven't found anything really wrong yet. will look at jetting and will try to get a photo up on here. |
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trev45
Joined: 15 Jun 2011 Posts: 449 Location: Sydney Australia
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Posted: Tue Apr 26, 2016 10:56 pm Post subject: |
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been to Jerez for motogp over the weekend
well then thats not fair , what a weekend to go , great racing
Trev |
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morebhp
Joined: 02 May 2012 Posts: 302 Location: Marbella, Spain
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Posted: Wed Apr 27, 2016 8:06 am Post subject: |
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Email or sms me the photo DaftGeorge and I'll post it if you want!
Surprised you are already feeling well enough to work on the VDue after Jerez _________________ Now - SB6R, GSX1400, KTM 990 SuperDuke
Then - H2A Trip, GSX1000R , EXC400, TZ250, R1, TL1000S, 1100 Kat, RG500, RD500, GPZ 900R GPZ1100 UniT, GSX1100, Z650
It was like that when I got here |
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morebhp
Joined: 02 May 2012 Posts: 302 Location: Marbella, Spain
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Posted: Wed Apr 27, 2016 5:57 pm Post subject: |
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Here you go DaftGeorge - here's the image - to me it looks like the piston may have holed because your head is too hot......
Oooops wrong image - that one looks like Jerez
Here you go.....
_________________ Now - SB6R, GSX1400, KTM 990 SuperDuke
Then - H2A Trip, GSX1000R , EXC400, TZ250, R1, TL1000S, 1100 Kat, RG500, RD500, GPZ 900R GPZ1100 UniT, GSX1100, Z650
It was like that when I got here |
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daftgeorge
Joined: 22 Sep 2014 Posts: 10 Location: Nottingham UK
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Posted: Wed Apr 27, 2016 8:59 pm Post subject: |
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thanks for putting the pic(s) on for me Belly .
As you all can see there is definitely an over-heating issue! |
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vort28
Joined: 22 Mar 2010 Posts: 2194 Location: Northwest , UK
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Posted: Thu Apr 28, 2016 7:22 am Post subject: |
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It has got the right plugs in it has'nt it ?
My Bro had an RD400 may years ago, when he bought it it had long reach plugs in it to 'give a bit more power' , as the previous owner said. Few hundred miles later a very similar thing happened. |
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JRH
Joined: 21 Jan 2013 Posts: 223 Location: West Mids/North East
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Posted: Thu Apr 28, 2016 12:19 pm Post subject: |
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Classic detonation failure.
Causes....
Timing too advanced
Mixture weak at a given point
Incorrect heat range of plug.
Is it on std pipes? |
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daftgeorge
Joined: 22 Sep 2014 Posts: 10 Location: Nottingham UK
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Posted: Fri Apr 29, 2016 11:56 am Post subject: |
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Thanks for your comments guys
I will check all items noted over the weekend and post up findings. |
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daftgeorge
Joined: 22 Sep 2014 Posts: 10 Location: Nottingham UK
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Posted: Tue May 03, 2016 9:27 pm Post subject: |
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Hi again fellow vdue-ites !
Chassis no. ZESVT5000WR000274
Plugs NGK BR9EIX (I thick these are correct)
Main jets BOTH 220 (I know they are supposed to be different by about 5. Hope its the top cylinder that needs to be bigger) Please let me know.
Ignition spec is a bit scare in the manual. There is no mention of it being adjustable so that is why i think there is no BTDC spec quoted.
As one of my pots is running fine and the pots are not individually adjustable i am not looking here for a problem.
At present the only issue i see is the jetting.
Your thoughts please.
Thanks |
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