seized cbr 2007 engine

theweemonkey · Derestricted Danger Joined: 27 Jul 2008 Karma :

Hi ... I have a Honda cbr 125 2007 model and the engine has seized just want to know what I can do to un seize it.... ????

If I cant un seize it I will be considering to fit second hand engine will a new 2015 engine fit my 2007 cbr ??

All help appreciated

redeem ouzzer · World Chat Champion Joined: 06 Oct 2015 Karma :

Why did it seize?
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stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

If a little 4t engine like that has seized, it's usually something fairly catastrophic like the camchain jumping a tooth or it having been run for a period with very low oil/oil pressure and the crank letting go.

What happened? Did it just stop? Any funny noises? How was it being ridden at the time?

Whip the plug out. What does it look like? Post a picture.

Dropping the oil into a clean container is a good next step. Check there is enough and strain it through a fine gauze to see if there are any bits of engine in there. Leave it to stand and see if a haze of metal particles appear on the surface.

The only way to find out what's going on properly though is to start stripping it down. I usually start by removing the rocker cover. A cam self-destruct or dropped valve can be obvious from here. Then I whip the head off, even if just to see the carnage.

Be aware, this may be more of a post-mortem examination rather than a fix. It's possible that something easily fixable could cause a 4t seizure (stuck on starter motor springs to mind) but most causes are terminal.
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theweemonkey · Derestricted Danger Joined: 27 Jul 2008 Karma :

Bike was running great .. then just came to a complete stop ..... Been to a mechanic who said when trying to manually turn the engine over it would not move...

I think ill strip it down and see what's what... will post pics alone the way..

davebike · World Chat Champion Joined: 15 Nov 2013 Karma :

I bet on "no oil" last checker ages ago
See the 20+ times a year
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theweemonkey · Derestricted Danger Joined: 27 Jul 2008 Karma :

What would I look for if bikes had low oil ie what part will be seized gears cylinder head ...

skatefreak · World Chat Champion Joined: 06 Feb 2010 Karma :

Sadly low oil is often more than just a
"It be stuck,
wife,
get me mah hammah" jobbies...
The lack of oil would result in excessive ware to the bearings and most of the top end as well as getting the piston *stuck* in the bore.
Free off the piston and if you are very very lucky it may be fine but will almost undoubtedly have reduced the life of the engine.
~~Usually the same oil lubes the clutch/gearbox so there could be some issues down there to...~~

davebike · World Chat Champion Joined: 15 Nov 2013 Karma :

Damage to :-

Piston rings bore
Cam followers and cam bearings
Big end and main bearings

Gearbox primary drive and clutch are usually OK
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NC750Xdct + others at work !
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stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

theweemonkey · Derestricted Danger Joined: 27 Jul 2008 Karma :

Thanks for all your knowledge... Lots of good advice.. Pictures are brilliant..

Keep it coming 😊

Will be getting stuck in to my engine soon..