When to change piston?

Iivana the cruel · Jun 1, 2017

Hello.

I was just wondering, how often do I have to change piston on my fc600?

I'm not using the bike on track, some dirt road and messing in the forest only.

I know that the oils must be changed in every 5h and I assume the valves need to checked every 15th?

Taffy · Jun 1, 2017

the valves yes if running the conical valve springs. the piston is good for 300 hours.

taffy

FE350 · Jun 2, 2017

Iivana the cruel said:
Hello.

I was just wondering, how often do I have to change piston on my fc600?

I'm not using the bike on track, some dirt road and messing in the forest only.

I know that the oils must be changed in every 5h and I assume the valves need to checked every 15th?

Nobody and I mean Nobody can tell you how many hours is required to change a piston.

Piston wear is all relative to how often oil is changed, how often the motor is overheated, how often dirt comes in through intake and I can go on for hours.

A piston needs to be changed when it is out of spec and or damage is done to it or the cylinder. The only way this can be told is to measure it and the cylinder.

A guess is a guess and nothing more. All riders ride different, All motors work different, All climates are different, All oils are different, all fuels and on and on.

jon andersson · Jun 2, 2017

And as always you have to filter through all the truths (and most of the time all different answers contain truths). So after 300h take out the piston, measure it, look at it, ponder about your oil changes and how you treated your engine. If all seems ok for you say "hyvä juttu" and slap it in again. Then you start to wonder how many more hours there is left in your old piston? 300 more? 100 more? What micro fractures were there that you can't see? So if you have the money you change the piston anyway and know you have atleast 300 more hours in it. If you don't want to spend that money you continue on your old and it will most probably work for many hours to come.
So as FE350 wrote, nobody can tell you. But 300h is probably a good time as Taffy said it. At the end off the day it's up to you and what you conclude/dare/spend. Personally I have no knowledge about the older Bergs, but I know you need to listen to people and draw your own conclusions and go from there

Taffy · Jun 2, 2017

FE350 said:
Nobody and I mean Nobody can tell you how many hours is required to change a piston.

Piston wear is all relative to how often oil is changed, how often the motor is overheated, how often dirt comes in through intake and I can go on for hours.

A piston needs to be changed when it is out of spec and or damage is done to it or the cylinder. The only way this can be told is to measure it and the cylinder.

A guess is a guess and nothing more. All riders ride different, All motors work different, All climates are different, All oils are different, all fuels and on and on.

as you can tell from this answer, there is a lotta, lotta damage here and i doubt it has any time left. probably dribbling oil now as well....

jampe · Jun 2, 2017

I have over 300h on a 501 -99 and about 400h on an 400 -00, the 400 i bought i parts an changed all bearings and valves but not the piston so i don`t know how many hours it had before i bought it and it`s still going strong.
Only used for driving Swedish stone enduro so no high revving....
Regards
Jampe

FE350 · Jun 3, 2017

I guess I should have made this statement more clear.

One can not guess the time in which a piston is required. You do not need to change it unless it requires attention. If you are not having issues with it, Motor is running correctly, Compression is fine, no oil bypass or fouling of the plug etc.. A plug tells a tale and a very good one. Compression tell the same.

If it ain't broken then no need to fix it. Some will require a piston quickly, some will not. But pistons do not have an expiry time or date. They work as long as they are within spec and last longer with good maintenance. Nobody can guess all the factors of a performance motor. Big end might wear and take out the piston, wrist pin might wear, rings might wear but if it is running ok then no need to mess with it unless you are made of money and are a skilled technician who has time on his hands.

No guidelines note when a piston is required as so many factors are in play with bikes. Unless you have a crystal ball or can tell the future with magic a educated guess is given. This guess is only as such and only a guess. Without ripping it down and checking each component, one can not know.

I would not consider a piston to be regular maintenance but more of part of a rebuild and when you pull it apart to check it would be wise to replace. When it gives trouble then replace it.

Taffy · Jun 3, 2017

the little end goes first on those older motors and also, the rings tend to make a rut just short of TDC and BDC and then again another at TDC and BDC. yet you can still keep them running. finally, they pass oil like a smoke machine.

so you could argue that the little end and the nikasil go first.

Taffy

When to change piston?

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