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Author Topic: Engine Damage Pics  (Read 18272 times)

Offline garye40

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Re: Engine Damage Pics
« Reply #45 on: August 09, 2009, 01:13:02 pm »
Quote from: Tommo on August 08, 2009, 11:11:59 pm
What are those 4 bolts in the butterfly for?

If the butterfly bolts to the shaft then you can probably just unscrew it and take it out to fit the bolt, if it slides through the middle of the shaft then you probably cant. If you get what im saying.

it has to stay in the other bolts hold the wedge on the other side of butterfly this one has been dewedged and bolted to cover the holes but dont use nuts and bolts again i would say vibriations from engine will loosen them and you wouldnt want this sorta damage again great pics I hada similar problem on a 4 stroke bike and a grub screw stoped the engine reachin tdc and bent the valve etc too
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Offline Tommo

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Re: Engine Damage Pics
« Reply #46 on: August 09, 2009, 05:49:53 pm »
Nyloc nuts or loctite. A lesson for all of us there I think.
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Offline lance

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Re: Engine Damage Pics
« Reply #47 on: August 09, 2009, 07:53:11 pm »
pleased ya found what it was mate, who dewedged your throttle?
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Offline Nick_S

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Re: Engine Damage Pics
« Reply #48 on: August 09, 2009, 08:09:00 pm »
Probably Beavis.
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Offline PeteG40

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Re: Engine Damage Pics
« Reply #49 on: August 09, 2009, 08:24:59 pm »
least you found the issue.  Iused nyloc nuts and loctite!
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Offline SteG40

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Re: Engine Damage Pics
« Reply #50 on: August 09, 2009, 10:18:56 pm »
Yeah PSD did it a few years ago.
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Offline hayesey

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Re: Engine Damage Pics
« Reply #51 on: August 10, 2009, 10:00:36 am »
I used liquid metal on mine, put a chamfer on both sides of the holes first and then when the resin dries it's an hour-glass shape so should stay in place.  Also if it was to come out it'd be a lot smaller than a nut & bolt so less chance of damage occurring. 
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Offline DaBigGinger

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Re: Engine Damage Pics
« Reply #52 on: August 11, 2009, 08:37:02 pm »
Just checked mine - it's a standard nut and bolt. No sign of any thread lock on it either. Everyone should check theirs unless they did it themselves just in case!
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Offline DaBigGinger

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Re: Engine Damage Pics
« Reply #53 on: August 17, 2009, 02:44:00 pm »
Just did mine, however the old bolts were threadlocked. Worth doing just in case :)
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Offline SteG40

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Re: Engine Damage Pics
« Reply #54 on: October 01, 2009, 06:46:43 pm »
Just a quick update on this finally got it all back together yesterday and it still won't start it's the same as before.

It turns over and tries to start but just misfires, I've done a compression test and cyl 1 with the damage is just over 100psi and the others are all around 140psi. It looks like the damage to the piston is too much. I think i'll pull it apart, have a look whats up and rebuild it but is it worth chucking more money at it?
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Offline hayesey

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Re: Engine Damage Pics
« Reply #55 on: October 01, 2009, 06:57:00 pm »
hmm, that's not good to hear.  I'm surprised it wont run though, the old engine I had in mine was down on compression on cylinder 3, it was less than 90psi and it still ran ok, just breathed really heavily. I even did a track day with it like that and it ran ok, it used oil but was ok.

Does the misfire stay the same or get worse if you remove the plug lead from that cylinder?  Are you sure the valves are sealing properly?  Might be worth doing a leakdown test.
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Offline Dan

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Re: Engine Damage Pics
« Reply #56 on: October 01, 2009, 08:26:30 pm »
Have the valves been re-seated ?
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Offline Tim C

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Re: Engine Damage Pics
« Reply #57 on: October 12, 2009, 11:02:19 pm »
Just joined the forum & thought i would have a read of some isues, having read most of these posts it's great reading different opinions mine is that when the engine got hungry & ate a bolt it broke the top of the piston thus gripping the top compression ring to tightly hence the loss of compression on this cyl...
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Offline neil_dubgt

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Re: Engine Damage Pics
« Reply #58 on: October 12, 2009, 11:32:08 pm »
hats off for robin for pretty much diagnosing it from the start!


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