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Dr. Frankenstein · Post by **Dr. Frankenstein** » Fri Jan 04, 2019 1:54 pm

The fins?? You mean the lower part, what I call the skirt?

And is it that simple? Just heat up the cylinder and it drops out?? I'll probably try that, just to see what happens; it's not going to get any less cracked...

I would think a replacement cylinder would be even rarer than a whole cylinder head...?

Dr. Frankenstein · Post by **Dr. Frankenstein** » Fri Jan 04, 2019 2:10 pm

Huh - - just did some digging around and found a whole bunch of stuff related to that - I never knew you could do that. Still kind of pricey though, and it looks like they new ones would have to be bored out to - in this case- 60mm, yes?

rrietman · Post by **rrietman** » Fri Jan 04, 2019 11:19 pm

First off, don't use a torch, lot to go wrong there. use a heat gun. next, liners are as common as dirt and usually you will need to bore oversize once they are installed. (same deal, heat and drop in). Is this a 305? 250's are a little harder to find. Tim at classic Honda has them new. I have a pile of used liners,if that's what you want let me know what size you need and I will send one for shipping cost.
Good luck
Randy

G-Man · Post by **G-Man** » Sat Jan 05, 2019 3:54 am

I just meant that the fins on the replacement barrel don't have to be any good. You're just after the liner so the rest can be scrap. Damaged cylinder barrels will be cheaper than pristine ones.

I use the same butane gast torch that I use when brazing aluminium parts. You just have to keep it moving. Mine's not hot enough to actually melt the material.

I've done plenty like that.

Cylinder barrel is the part with the liners. Cylinder head; the lump with the valves & camshaft.

G

Dr. Frankenstein wrote:The fins?? You mean the lower part, what I call the skirt?

And is it that simple? Just heat up the cylinder and it drops out?? I'll probably try that, just to see what happens; it's not going to get any less cracked...

I would think a replacement cylinder would be even rarer than a whole cylinder head...?

Dr. Frankenstein · Post by **Dr. Frankenstein** » Sat Jan 05, 2019 8:52 am

rrietman - Yes, it is a 305 and used is fine. This bike I'm putting back together, I'm just putting it back together to have fun with, it's not going to be a show bike or anything like that. Just so long as they're still serviceable, that'd be great. I'll PM you the sizes when I re-measure them, but I know the bores/pistons are 60.. (59.85, or some such...).

This is what its going on - (it looks a lot better now - this was taken right after I got it off the truck...).

DSCN1056 (1) by Dr. Frankenstein1, on Flickr

G-Man: I have both, a torch and a heat gun, but the heat gun is safer, I would think. So all I do is heat up the cylinder head/case and they should drop out, or the cylinder sleeve itself?

I wonder if the wife would let me use the oven...I doubt it...;)

Seadog · Post by **Seadog** » Sat Jan 05, 2019 12:47 pm

I’ve been thinking that a covered barbecue might work....

Dr. Frankenstein · Post by **Dr. Frankenstein** » Sat Jan 05, 2019 2:38 pm

OK, that was very cool! I never knew you could do that, that quickly! I always thought the cylinders were pressed in, but yeah: I heated it up with a heat gun and gave a little push and it just slid right out! And yes, it will make life a little easier - I thought I was going to have to buy a whole new lower head; Thanks guys! :)

I assume the process to install a new one is the reverse...? Just heat up the block and freeze the replacement, then drop it in...? Like installing bearings...