piston life span

[stuart]

hi , what's the longest you would expect a piston to be ok in a ec300 ?

my bike still sounds fine & as far as i can tell has the same power as a year ago when it was new .

my bikes now done 121 hours .

[liv2day]

Originally Posted by stuart

my bikes now done about 250 hours .

Holy carp you get out and ride a bunch - is that just in one year's time?

I'll let others with way more knowledge and experience talk to piston life at that many hours, but seems pretty high if you haven't done a top end or dug into the cylinder. I'm planning to put a new piston & rings in my 200 and she has ~110 hours on her right now for what it's worth.

Would be very interested to see pictures of the piston and everything else in the motor if you pull her apart

[stuart]

just been to my hut i made a mistake

my bike's done 2990 miles , 121 hrs , i'll edit my last post

[Jacob 'Berg]

Originally Posted by stuart

hi , what's the longest you would expect a piston to be ok in a ec300 ?

my bike still sounds fine & as far as i can tell has the same power as a year ago when it was new .

my bikes now done 121 hours .

I would not trust subjective reasoning to guide your judgement on piston and ring life. You may not notice lack of compression if you ride every weekend and you are loosing compression slowly over time. Better to check the ring gaps and look at the piston and make sure you are still within spec.

[barossi73]

how hard do you ride it?has it ever got hot or sucked water?fuels,mixes,jetting?too many variables.ballpark general opinion will prob recommend replacing at around 40-60hrs 125,60-80hrs 200,80-100hrs 250,100-120hrs 300.the smaller capacities rev higher and the tolerances are less forgiving.serious racers will prob be around 1/2 those hrs to keep engines fresh

[rubber Jonny]

100 hours seems to be about average, my mate went 252 hours on a 2012 GG300 without a piston or ring change! Bike still went well.

[n_green]

I know a bloke who put 15000 klm on an '08 I think it was EC300. He put new rings in it and kept the same piston. Put another 6000klm on it before looping it and the throttle cable got stuck WOT and the cylinder melted and self destructed.
Mind you this bloke rides 5-7 times a week and most of it is trail cutting so it's a very slow pace and I don't think his bike ever got on the pipe. Definitely not recommended, but it goes to show how reliable they can be if you're game to test them.

[NZMark]

300's are pretty easy on pistons
But this all depends on how hard you ride them
I'm happy doing 130-140hrs on mine and they look fine when I change them
Hope this helps put your mind at ease

[stuart]

thanks for the reply's , i don't ride it that hard .

if its not doing 30-40 mph on the roads i'm messing about in 1st gear low revs going through woods or over moorland .

i'll order a set of rings & a piston soon & when i get it looked at if it only needs rings i can keep the piston for a later date in the future .