Is my cylinder in bad shape?

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fischer550

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Mar 24, 2014
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So I have attatched a few pics of my cylinder. The first pic show light scratching, not deep enough to catch a fingernail though, and the third picture shows a big brown mark in the cylinder. Is my cylinder done for, or is this normal? I am still in the break in period running 16:1 gas/oil.
 

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Theon

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Jan 20, 2014
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Looks OK from here, your photos are a bit blurry.
16 to 1 is incorrect.
25 to 1 is the very most oil I would run, and only for one tank.
But use good oil!
others opinions on break in may differ.
 
2door

2door

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Sep 15, 2008
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Theon said:
Looks OK from here, your photos are a bit blurry.
16 to 1 is incorrect.
25 to 1 is the very most oil I would run, and only for one tank.
But use good oil!
others opinions on break in may differ.
Click to expand...
Ditto:

Ignore the kit instructions about oil mix ratio. 16:1 is too much oil. Drop your oil content to at least Theon's 25:1 recommendation.
Break in procedures are as varied as the people who build and ride motorized bicycles. You'll need to do some reading here and decide for yourself what works for you.
Good luck.

Be careful reassembling the piston back into the cylinder. There's a trick to it.

Tom
 
maniac57

maniac57

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I agree. 16:1 is far too much oil. I run 40:1 right from the start, but 32:1 is fine as well. In my opinion, even 24:1 is too much oil and results in lots of deposits in the cylinder and exhaust port as well as a sloppy mess out the exhaust pipe.
As far as marks in your cylinder, as long as you cannot feel grooves you should be fine. Discoloration is normal running that much oil.
 
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fischer550

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Mar 24, 2014
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Fort Collins, CO
I can feel the scratches, but barely. And as far as oil ratio, I use super tech 2 cycle oil (from walmart) which i don't think is synthetic so can I run 40:1 and still be good?
 
xseler

xseler

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Apr 14, 2013
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Just getting on the bandwagon.........it's fine and good to go!

I used 32:1 for break-in and run 50:1 (Echo synthetic) now --- same mix as my Echo weed whacker. Makes things much easier.
 
xseler

xseler

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Apr 14, 2013
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Wild Bill said:
Why did you open the motor up? Like the old saying goes, "If you keep picking at it, it aint never gonna heal". Put it back together and run it.
Click to expand...

Bill, are you my long lost 'other brother'?? Sounds just like my Mom!

I think that say'n was part of the pre Dr Spock mother's handbook......:D
 
Kioshk

Kioshk

Active Member
Oct 21, 2012
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On a related note: my engine's been running TOO well and for TOO long; contrary to the IIABDFI adage, I'm tempted to inspect the upper needle-bearing. Taming my own OCD!
 
mapbike

mapbike

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Mar 14, 2010
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Kioshk said:
On a related note: my engine's been running TOO well and for TOO long; contrary to the IIABDFI adage, I'm tempted to inspect the upper needle-bearing. Taming my own OCD!
Click to expand...
If its a stock china girl bearing and you have lots of miles on it, that might not be a bad idea since if it does give up it will trash the engine most likely, If you put a high quality bearing in the engine already Id say you're probably in good shape, but hey.... if ya gotta then ya just gotta and if it makes you feel better to look it over and check for wear that ain't no biggie, I pulled a perfectly good running engine down last week and put a different wrist pin and upper bushing in it for an experiment, that engine has been running good since 2009 and has well over 2000 miles on it.

if a person knows what they're doing and enjoys tinkering with theses engines, it's just part of it to go into one of them ever now and then.

Map
.wee.
 
Kioshk

Kioshk

Active Member
Oct 21, 2012
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Oh, I've paid my dues; I know these engines pretty well now and have the pile of dead jugs to prove it. Alas, it IS a stock needle-bearing. *SIGH*
 
mapbike

mapbike

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Mar 14, 2010
5,502
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Central Area of Texas
Kioshk said:
Oh, I've paid my dues; I know these engines pretty well now and have the pile of dead jugs to prove it. Alas, it IS a stock needle-bearing. *SIGH*
Click to expand...
LOL.........!

Since it is a stock bearing it might not be a bad idea to have a look see at her, no sense in breaking the legs of a good running little gal if-in you don't have too and checking and possibly replacing that bearing may be just what it take to save a life....LOL!

Map
.wee.
 
maniac57

maniac57

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Oct 8, 2011
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I've come to consider the needle bearing as a normal service replacement part, like rings or seals.
Too cheap to let a worn out bearing take down a good running motor.
Plus there are several better quality parts available from the chainsaw and moped crowd.
Stihl and Echo have chainsaw bearings that fit, as well as gilardoni and (I think) Tomos mopeds.
 
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