Need expert opinion on a lay down Honda cylinder please

[RIDE-RED 250r]

Hey guys.

I am a little conflicted on an issue I have. Here it is..

I have this 125m cylinder. It has 6 cooling fins partially broken off. I have had some tell me the engine will chronically overheat and blow through top ends prematurely, but personally my hunch is that it will be OK to run.

I just need some opinions from some of the veterans here with alot of experience with these. See pic below..

Thanks! :)

[C.J]

You will be just fine. Unless you are hard core racing on that cylinder, it'll be fine.

[just ben]

It will be fine. I just hope that's not the piston you plan to put in it LOL!

[barnett468]

no prob as mentioned above, but if you bore it, just bore it .0005" larger than normal then break in slow.

[RIDE-RED 250r]

Thanks much for the input fellas.

The background is, I bought this cylinder from a member. He packed it well, but apparently it took a heck of a shot while in transit and broke those fins. The pieces were right there in the box. When I let him know what happened, he went above and beyond, even though I am confident it wasn't his fault.

So, I told him I would post pics and seek the opinions of the members here. I was leaning toward it not being an issue. But he was worried it would give is problems and refunded my money (even though I protested) and wanted me to send it back to him on his dime...

So, that settles it. Thank again guys! :beer

And Ben: You're right.. I don't think that old Tri-Z piston would work too well! LOL! :D

[barnett468]

I bought this cylinder from a member. He packed it well, but apparently it took a heck of a shot while in transit and broke those fins. The pieces were right there in the box.they can easily be welded back on then.





And Ben: You're right.. I don't think that old Tri-Z piston would work too well! LOL!that's what a press is made for!

[C.J]

they can easily be welded back on then.

You ever weld cast iron? You're better off just putting them fins away and not worrying about it.

[barnett468]

You ever weld cast iron?yup, lots.



You're better off just putting them fins away and not worrying about it.only if is not or can not find a competent cast iron welder.

[atc300r]

I think nichol rod is used for welding castiron.Back when I worked on farms we wold weld tractor blocks when they would get cracks.My neighbor at the time could run a bead on cast like a pro welder welding steel.

[barnett468]

below is just 1 of dozens of videos on you tube showing cast iron repair with both mig and tug not to mention torch spray welding. almost anyone can easily learn it. keep in mind auto machine shops have been welding cracks and worn journals on cast iron crankshafts for over 60 years, lol.

http://www.youtube.com/watch?v=HTEy_yeTMEo

[just ben]

preheating,nickel rod and it has to be cooled slowly. It can be done but some castings just won't weld without cracking as it cools.

[fastatc70]

I would either run it as is. Or just find another cylinder. Welding the cylinder seems like a waist of time the cylinder will need to be bored and or honed and just seems like a lot of trouble.