I just noticed today, that in one of the cylinders walls are kinda damaged pretty good... so what do? its not hugely gashed up, but its there. and the rings look fine? so I'm not sure how this happened.



so what should I do from here?

Honing may help. Ive had a few engines scored like this with decent rings, mine ran fine without doing anything to rectify scoring

Yeah honing, maybe oversized rings/pistons/.
If you don't mind me asking:
Do you use OEM air filters, or OEM equivalents, or lunchbox, maybe pods?
What kind of oil do you use?

Quote from: Atesz792 on December 22, 2014, 01:14:49 PM
Yeah honing, maybe oversized rings/pistons/.
If you don't mind me asking:
Do you use OEM air filters, or OEM equivalents, or lunchbox, maybe pods?
What kind of oil do you use?

I'm not exactly sure what the history is, but the lunchbox and the OEM air filter was in the bike. as far as oil, I'm not sure whats in it.. this is a project bike of mine, so history is pretty unknown. the valves went bad, so maybe this has something to do with it. I haven't even drained the oil yet.. so maybe there's some metal flakes hiding in it somewhere... it had to of been something pretty hard to knick up the cylinder walls, they aren't exactly "soft"

if it helps at all.. the scuffs are exactly over top of the intake side. the other side has the same exact scuffs like this, but not nearly as bad. and mostly towards the top.

You cant hone your way outta that. You have to bore it. Of course you can hone it till its clean, but likely you'd have an odd sized off spec inprecise cylinder with crazy differences in diameter. Honing is imprecise, its fine for surface clean up, but a hard firm bore tool works better.
.25 mm is the next size you can do, but make sure you can get pistons and rings in that bore size. Of course .5mm is the next size they sell for sure.
I dunno they sell .010 pistons for cars. That's .25mm. They dont for this stupid thing.
You're in any case gonna have to get the rings filed and end gapped and fitted.
Cool.
Buddha.

True buddha,  a valid point there. A hone i had used before following a cylinder bore to etch the crosshatch pattern in the cylinder walls

Quote from: The Buddha on December 22, 2014, 02:21:22 PM
You cant hone your way outta that. You have to bore it. Of course you can hone it till its clean, but likely you'd have an odd sized off spec inprecise cylinder with crazy differences in diameter. Honing is imprecise, its fine for surface clean up, but a hard firm bore tool works better.
.25 mm is the next size you can do, but make sure you can get pistons and rings in that bore size. Of course .5mm is the next size they sell for sure.
I dunno they sell .010 pistons for cars. That's .25mm. They dont for this stupid thing.
You're in any case gonna have to get the rings filed and end gapped and fitted.
Cool.
Buddha.

great... more money....... I don't think a GS should cost this much.... 

He he ... dude a bore, piston, ring job on anything is 200-300 per cyl. That is 4-600 on the GS. The bigger the cyl the more it costs too. Like a 100 mm cyl is likely to cost 10-30% more than a 50mm. My MZ 102 mm bore just about set me back 250 or so just for the cyl, piston, rings and valve/head work. The genius that worked on it before me bored it to 102mm put a 12.5 piston in it, and well, the bozo before the bozo that sold it to me I guess, and he happily sold it to bozo who sold it to me bozo#3 and never told me. I blow it up running regular gas in it, Thankfully I put a tiny crack in the piston and no other damage.

A whole GS is cheaper per tonnage LOL, with semi runners going for barely more than that. Used crap that needs some work is cheaper on average, precisely becuase 99% of the population cant lift a wrench to save their life. Something with carb trouble that the seller is sure could be electrical, or maybe even motor = dirt cheap. So find someone who says that on Craigslist and go snatch it up cheap, they need to pay christmas bills.

Cool.
Buddha.

Indeed

the issue I'm having here is that the craigslist ideal would work, if I live ANYWHERE else other then CFL. for a really bad beat up GS, that doesn't even run, you're looking at like 800 dollars, and a lung. ill look around.. see what can be done.

Quote from: J_Walker on December 23, 2014, 10:57:11 AM
the issue I'm having here is that the craigslist ideal would work, if I live ANYWHERE else other then CFL. for a really bad beat up GS, that doesn't even run, you're looking at like 800 dollars, and a lung. ill look around.. see what can be done.

NC isn't much better. Find a friend in Minnesota.
But hey the drop in gas $$$ means you can run there with a small pickup truck for a few 100.
Now there is a bunch of cool audio sheite in FL I have seen in the last few weeks. Let me see if in this area GS is around for cheap.

Cool.
Buddha.

Quote from: The Buddha on December 23, 2014, 02:04:59 PM

Quote from: J_Walker on December 23, 2014, 10:57:11 AM
the issue I'm having here is that the craigslist ideal would work, if I live ANYWHERE else other then CFL. for a really bad beat up GS, that doesn't even run, you're looking at like 800 dollars, and a lung. ill look around.. see what can be done.

NC isn't much better. Find a friend in Minnesota.
But hey the drop in gas $$$ means you can run there with a small pickup truck for a few 100.
Now there is a bunch of cool audio sheite in FL I have seen in the last few weeks. Let me see if in this area GS is around for cheap.

Cool.
Buddha.

that's because half the audio stuff is stolen, and trying to be re-sold... 

Bah, it'll buff out. Just ride it till ya can't ride it no more.

Quote from: Kijona on December 23, 2014, 07:56:34 PM
Bah, it'll buff out. Just ride it till ya can't ride it no more.

erm at some of these price quotes... I might just end up doing that...

J Walker,

If you can't find a used engine...

I would try honing it...takes some measurements after to be sure you are in spec...there is some room there (in the spec). Put new rings in if the pistons look okay. If they are scored you should replace them.

You'll have a few hundred in.

Dennis

Quote from: J_Walker on December 23, 2014, 02:47:03 PM

that's because half the audio stuff is stolen, and trying to be re-sold... 

That car crap. I'm talking house crap.
Cool.
Buddha.

Uh oh i forsee a random buddha rant coming soon lol

J walker,

I got a set of cylinders and pistons from an 11,000mi engine that tossed a valve shim. Speak up if you want em.. just junk in my garage otherwise.

Otherwise, give that bore a quick hone and toss her back together with some rings, and run it. You'll never know the difference.
I've run stuff that looks worse than that.

Quote from: The_Paragon on December 26, 2014, 01:43:50 PM
J walker,

I got a set of cylinders and pistons from an 11,000mi engine that tossed a valve shim. Speak up if you want em.. just junk in my garage otherwise.

Otherwise, give that bore a quick hone and toss her back together with some rings, and run it. You'll never know the difference.
I've run stuff that looks worse than that.

I've been shopping around for a honing tools. but ill keep that offer open.. lol

Quote from: J_Walker on December 22, 2014, 01:00:59 PM
I just noticed today, that in one of the cylinders walls are kinda damaged pretty good... so what do? its not hugely gashed up, but its there. and the rings look fine? so I'm not sure how this happened.



so what should I do from here?

ebay some jugs in better condition.