[Bates55]

She’s coming apart, looks like the previous owner didn’t believe in oil? See attached pictures - need some advice on what to do moving forward. Thanks!

 

[drydreamer]

Pictures a little fuzzy but enough detail to show valve head and some damage...

In one picture can I see alloy " corrosion" on cylinder "pent roof" ?

How is that bore for corrosion ?

I wonder if some previous
owner had stored bike long enough for that exhaust valve to stick open ?

An inconsiderate "awakening" from hibernation dismissing the possibility of a stuck Valve can make a viable engine SCRAP in one stroke, with resultant damage as seen.

You have been warned.

Any sign of a bent valve stem on that broken valve ?

I would keep dismantling being carefull to put stuff back like con rod caps etc..

Any signs of it being apart before ?

Pictures pictures pictures pictures...

An eBay engine could be sourced....

Or sell parts from this bike to fund next....

If you particularly like this model, keep and get an other....

Yes, it all boils down to money...

 

[Bates55]

I appreciate it, definitely not what I was hoping to see.

 

[Danbel4]

Anyone able to point me in the direction of a manual for this cm450? I’m going to try and take this guy apart, but would like to have access to a manual I could reference! Thanks.

 

[circling the drain]

Wow, a picture of a manual. Great

 

[Bates55]

Anyone know if I’d need to direct swap the cylinder head/pistons from an ‘82 cm450c or did other years/models use similar parts? I’m finding some on eBay/cmsnl, but want to make sure before I spend another $200 on everything.

 

[Danbel4]

Wow, a picture of a manual. Great

Just trying to be helpful, the guy asked about manuals and I have a cm450c and find this one very informative

 

[Genoapb]

Hey man, I replied to your message. That motor is up for grabs if you need it. I'm literally just using it for mockup.