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  #1  
Old 15-10-2010, 11:04 PM
baz elzebub baz elzebub is offline
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Default WHUMP!! Tinkle-tinkle...Piston Broke!

...And I was pissed and broke, after this!

Competition Time:- Name the cause of this Guzzi Gaff....
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  #2  
Old 15-10-2010, 11:18 PM
matthewmosse matthewmosse is offline
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Thinking that looks familiar, dropped valve? Did it still run afterwards? the sighn of a truly great motorcycle is if it makes it home like that, I'm pleased to list Honda 550/4's in this elite class that keep running after tinkle tikle crunch time, Bmw's however do not (at least when a conrod punches through a crankcase)
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Old 15-10-2010, 11:28 PM
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Gosh ! ...Ignition timing ?
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Old 16-10-2010, 07:52 AM
teltwosheds teltwosheds is offline
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new valves fitted at some time with wrong valve spring clearance? (pronounced tapping noise at tick over)
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Old 16-10-2010, 08:09 AM
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Overrevved?
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Old 16-10-2010, 11:26 AM
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Scratch marks and broken rings suggest it didn't run long after the problem
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Old 16-10-2010, 01:43 PM
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Looks rather splendid does that.

I too reckon it's dropped a valve.
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Old 16-10-2010, 05:38 PM
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Sorry about your motor, but did the spark plug centre electrode fall in ?
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Old 16-10-2010, 06:35 PM
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you tried running it on diesel
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Old 16-10-2010, 10:22 PM
matthewmosse matthewmosse is offline
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Bmw's have a similar setup in some ways engine wise, the valves on some models apparently can let go at high milages, thats according to motobins catalouge - I think it's the R90S but cann't recall. May also be issues aound using uneaded if the bikes an old one. Either way it will need fixing
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Old 16-10-2010, 10:39 PM
baz elzebub baz elzebub is offline
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Default Yeahhh!

...And the winner of Peanut Of The Month is...Matthew Mosse!

Correct - it was a dropped valve (head, to be exact - the stem stayed put!).
To say the clinder head and barrel were pharqued too is something of a foregone understatement, but they're still hiding in the depths of the garage, where I lobbed them in disgust and foul temper...some years ago...
Truth was, I just unearthed the piston, and I thought I'd share it with you as a warning that V50 'Guzzi's had some awful habits to catch the valve-adjustment ignoramusii, with pocket-holing results.

Be very aware!!!!
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Old 17-10-2010, 04:56 PM
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You cant even make an ashtray out of that !....... A mates x7 was always blowing up and one year we all got piston ash trays as christmas presents !
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Old 18-10-2010, 02:18 PM
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Actually looks as if it was shot at point blank range with a LE 303!
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Old 18-10-2010, 03:42 PM
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Quote:
Originally Posted by Biker Buster View Post
Actually looks as if it was shot at point blank range with a LE 303!
Last time I saw one of those was in Kenya when the Kings African Rifles revolted and we had to put them down smartly.

For those on a different timescale it was the year Kennedy got shot..

Oh no..I lied..I owned one in New Zealand...bought it of a copper for 10 after it had been handed in..

John
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Old 18-10-2010, 03:54 PM
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Navy was still using them 'till the latter part of 1981. When I was in basic, our gunnery instructor showed the effect of the 303 on various materials at 100yds, the effect on a sheet of aluminium was not too dissimilar.

Scared the chit right out of me!
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Old 18-10-2010, 09:19 PM
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Quote:
Originally Posted by matthewmosse View Post
Bmw's have a similar setup in some ways engine wise, the valves on some models apparently can let go at high milages, thats according to motobins catalouge - I think it's the R90S but cann't recall. May also be issues aound using uneaded if the bikes an old one. Either way it will need fixing
r45 and r65 engines (shorter stroke than the other boxers, hence slightly more revvy) have a habit of losing the heads off their valves at about 30 thousand miles, its quite a common occurence, enough for valves to be treated as consumables when they are serviced around that mileage!! the other boxers dont have the same habit, they just run and run!!
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Old 21-10-2010, 11:07 PM
matthewmosse matthewmosse is offline
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I have a love hate thing with the bigger beemers, to ride they are really very good if maybe not so economical as my Hondas, maintenence wise they are a tad less effort day to day, but long term they cost if something needs doing. Also they lack a kickstarter. For running on a shoestring budgett the Hondas win out by miles but that's probably down to my bad luck, with the parts mine had they should go round the globe and back, I just cann't be arsed to get them on the road.
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