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Old 20-02-2006, 10:12 PM   #1
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any one know about reeding pistons

was told the best way to find out if my xr2 was running rich. was to go on a run flat out then kill the ignition. then look at wot colour the pistons are .so thats wot i done on sunday. to find that the right hand pistons were black and the left hand pistons were clean so clean you could read the number on top of the new piston. when i shut the engine down i was pulling 6 1\2 thousand rpm. dose any one know wot to make of this i.e is there some thing wrong
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Old 20-02-2006, 10:27 PM   #2
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same sort of thing as a plug chop i think except in that respect you check the colour of the plugs,not sure wether you can use this method on outboards?
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Old 20-02-2006, 10:54 PM   #3
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Was it this clean
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Old 20-02-2006, 11:00 PM   #4
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When reading spark plugs, you're looking for the porcelain of the centre electrode to be chocolate brown in colour.

The only time I've seen pistons clean is when there is water getting into the cylinder. Or when they are new. I wouldn't imagine you've got water in three cylinders though.
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Old 20-02-2006, 11:13 PM   #5
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as i said dude, its wierd. some one will know though dude
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Old 20-02-2006, 11:15 PM   #6
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piston colour

not so. it's all down to the colour of the top of the pston. after doinig wot i did and for every think to be hunky dory the pistons should de darker towards the exaust port taning off at the intake
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Old 20-02-2006, 11:33 PM   #7
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JW, what impact does the oil in a 2 stroke have? Does it change the colour to make it unreadable?

Quote:
Originally posted by jw.
When reading spark plugs, you're looking for the porcelain of the centre electrode to be chocolate brown in colour.

The only time I've seen pistons clean is when there is water getting into the cylinder. Or when they are new. I wouldn't imagine you've got water in three cylinders though.
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Old 20-02-2006, 11:37 PM   #8
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xr2

Quote:
Originally posted by jw.
When reading spark plugs, you're looking for the porcelain of the centre electrode to be chocolate brown in colour.

The only time I've seen pistons clean is when there is water getting into the cylinder. Or when they are new. I wouldn't imagine you've got water in three cylinders though.
thought of that. but no sigh of water in the bors or on the plugs the plugs are spot on the right colour all 6 and if ther was water getting in there's no way it would pull6.1/2 rmp
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Old 20-02-2006, 11:39 PM   #9
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this makes a good read

http://www.nightrider.com/biketech/readplugs.htm

http://www.maxracesoftware.com/spark_plugs.htm
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Old 20-02-2006, 11:56 PM   #10
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piston colour

two weeks ago i had a miss fire when i had a look i found no6 piston clean and the rest black and found that the green triger wire to the coil was f**cked so just it not sparkin can clean the the top of the piston but its fireng on all 6 now
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Old 21-02-2006, 12:02 AM   #11
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spark plug

Quote:
Originally posted by michaelcaine
this makes a good read

http://www.nightrider.com/biketech/readplugs.htm

http://www.maxracesoftware.com/spark_plugs.htm
all well and good but a murc v6 spark plug dont look nothing like wot you put in your austin alegro
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Old 21-02-2006, 12:17 AM   #12
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my old engin

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Originally posted by roofer
Was it this clean
thats wot my old 200 looked like after leting burty loos behind the handle bars of my old sharpe
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Old 21-02-2006, 12:22 AM   #13
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errrr no, fink you will find that someone didnt tighten the bolts on the air box and your engine was hungry
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Old 21-02-2006, 12:29 AM   #14
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nuts

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errrr no, fink you will find that someone didnt tighten the bolts on the air box and your engine was hungry
the only lose nut was the one behind the wheel !
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Old 21-02-2006, 08:46 AM   #15
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Either that one bank was not working at all, which is impossible if it was doing 6 1/2 thousand RPM or that side is very very rich and it has "washed" the top of the piston - does it smoke a lot? must admit it sounds odd?

Anyone else got any theories?
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Old 21-02-2006, 09:07 AM   #16
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Yeh. That it's not too rich - it's too lean and borderline gonna grenade. I reckon it would have to be sooooo rich as to not be firing for no carbon to be deposited, but if the combustion temperatures are too high it'll burn the carbon off.

I'd retard the timing a bit and richen it slightly, then check again.

I definately wouldn't be leaning it out.
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Old 21-02-2006, 09:11 AM   #17
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Changing the timing would affect both sides though??????????

I agree - richening it is the best way to start - it can't blow anything up - I would also check float cut off valves and look for air leaks .......... something must be wrong!

Why did you do this anyway? Is it down on power or something?
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Old 21-02-2006, 09:15 AM   #18
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Retarding the timing a bit is just an extra safety measure while he investigates - you're right though, it'll affect both sides, but if it's really that borderline, I reckon a bit of extra insurance is OK until he sorts it out.
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Old 21-02-2006, 10:16 AM   #19
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Quote:
Originally posted by Cookee
Changing the timing would affect both sides though??????????

I agree - richening it is the best way to start - it can't blow anything up - I would also check float cut off valves and look for air leaks .......... something must be wrong!

Why did you do this anyway? Is it down on power or something?
its only just been rebuilt and the Guy who built it said after running in he would have to change the jets but didnt tell him what to so thats why he was checking what it was like first.
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Old 21-02-2006, 10:32 AM   #20
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Quote:
Originally posted by Burty
its only just been rebuilt and the Guy who built it said after running in he would have to change the jets but didnt tell him what to so thats why he was checking what it was like first.
There's your answer, its running rich so you dont blow it up again.
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