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Changing piston and rings before it blows?

This is a discussion on Changing piston and rings before it blows? within the Yamaha YFS200 Blaster ('88-Present) forums, part of the Performance /Technical category; While my Blaster is still running great, I am pretty sure it has the original top end (5 years). I am thinking about putting a ...


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Old 01-02-2004, 11:38 PM   #1
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Default Changing piston and rings before it blows?

While my Blaster is still running great, I am pretty sure it has the original top end (5 years). I am thinking about putting a new piston and rings in it before it blows out on a trail. Would it be worth it or is the normal wear on the cylinder walls significant enough for me to have to bore it out?
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Old 01-02-2004, 11:40 PM   #2
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My MOTO: Dont fix it unless its broke
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Old 01-02-2004, 11:42 PM   #3
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Quote: Originally Posted by trailboss
My MOTO: Dont fix it unless its broke
What about always be prepared ?

I forgot to mention that I'm going to have the top end off anyways.
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Old 01-02-2004, 11:48 PM   #4
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i think it depends on all you want to do i would have it redone anyways just to know its done and i wouldnt have to worry about it.
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Old 01-03-2004, 12:15 AM   #5
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get it redone before ur piston drops a skirt and ruins the crank like mine did, lol actually just do it may not be time yet but its worth it just to kno ur ridin on a new topend and u can relyon it now
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Old 01-03-2004, 12:35 AM   #6
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yeah, my friends 96 dropped a skirt on the orignial top end, if you are going to have it apart anyways then go for it.
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Old 01-03-2004, 12:38 AM   #7
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that was m post above sorry lol,i kind of signed in the wrong sn,
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Old 01-03-2004, 08:05 PM   #8
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I think if I were to consider putting in a new piston/ring assy I would go on and have it bored;that way you KNOW the cylinder is round and the clearances are correct.
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Old 01-03-2004, 08:58 PM   #9
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I would run a compression check and then decide from there. My piston dropped its skirt . 96 blasty wit original piston. But it was runnin lean.
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Old 01-04-2004, 01:50 PM   #10
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How are you all dropping skirts? i have been around alot of blasters and never had one do that? Idk i guess bad luck.

5 years on the topend DO IT. You are not even knowing the full potential of the little 2-stroke. With a new topend PUT IN CORRECT it will wake it up and run good. When i got my 00 we replaced the topend in 02 i believe it was. My uncle replaces the piston and rings in his kx250 every 20hrs...me its every yr unless it seizes.

and yes if the blaster was ridden a decent amount it will need to be bored. I would just go like .020 anyway with a good Wiseco Pro-lite piston
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Old 01-04-2004, 02:43 PM   #11
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my blaster is a 92 and it had its original piston up until now. It never blew or anything but the piston and rings were awefully scored
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Old 01-04-2004, 11:52 PM   #12
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Quote: Originally Posted by high_octane94
my blaster is a 92 and it had its original piston up until now. It never blew or anything but the piston and rings were awefully scored
Wow that's very impressive.

I'm thinking about just sending out my top end to HDP to get it PD#2'd and bored. And while I wait I'll get a Pro-lite piston.

Thanks for your input guys.
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Old 01-05-2004, 12:21 AM   #13
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Go for it, 5 year old top end, its due ne time to blow or drop a skirt. Top ends are really easy, and cheap to do too. They only cost my like $80 max. But i reused the wristpin, so add the price of a wristpin to that. I say go for it. Its worth your time
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Old 01-05-2004, 06:05 PM   #14
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Quote: Originally Posted by Blastermaster58
Go for it, 5 year old top end, its due ne time to blow or drop a skirt. Top ends are really easy, and cheap to do too. They only cost my like $80 max. But i reused the wristpin, so add the price of a wristpin to that. I say go for it. Its worth your time
just cause a topend is old does not mean it will drop a skirt. The rings will wear and you will have blow-by, and loose compression. Plus where are you getting your topend at...lol?
$80 max....i dont think so.

If you but all these parts FROM A DEALER the wiseco piston/ring set is around $80 alone...prob close to $90. Then head and base gaskets are around another $20. Then if you need is bored that is about another $65 (dealer cost here)
you are looking at close to 150-200 IF you do it your self and IF YOU BUY A NEW PISTON
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Old 01-05-2004, 07:16 PM   #15
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YA CHANGE IT, I DO BOTH OF MY QUADS ONCE A YEAR WEATHER IT NEEDS IT OR NOT, DEFITNLY HAVE IT BORED AND REPLACE THE PIN BEARING.ALSO GET THE PISTON KIT AND HAVE IT BOARD AT THE SAME PLACE THEY WILL MAKE SURE EVERTHING IS GOOD PLUS IT ONLY COST AROUND $40 FOR THE BORE DOWN HERE AT DUNERS ATV IN CHANLDER,AZ AND THE PISTON KIT ARE $10 OR SO HIGHER THAN THE MAGAZINE ADDS

PIECE OF MIND AND REALIBILTY
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Old 01-05-2004, 07:46 PM   #16
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ya that will keep them runnin strong, not every year tho for a person on a budget lol
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97 mx blaster 30mm mikuni carb,
WSM aluminum piston,bored.50 over,
AC racing nerfs- grab bar,
FMF exhaust,
boyesen reeds/ spacer,
Trenga intake,
front end extended 4"
PD tether,
K+N Filter,lid-less
BAnshee front shocks
front 19" holeshtos
cut front and rear fenders,
alloy bars,
18" turf tamers on doug redlabels
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Old 01-05-2004, 09:13 PM   #17
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hey i would just go ahead and do it better safe than sorry my bike ran on stock bore for 15 years!!! but my blasty was mint whenever i bought it i also dropped the skirt 2 but it was from piston slap if you hear a knocking its time to get it freshened up piston slap will occur from the bore on the cylinder being 2 big (oval shape) and the piston moving back and forth actually "slapping" the piston skirt on the cylinder
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Old 01-06-2004, 03:06 PM   #18
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Quote:
just cause a topend is old does not mean it will drop a skirt. The rings will wear and you will have blow-by, and loose compression. Plus where are you getting your topend at...lol?
$80 max....i dont think so.

If you but all these parts FROM A DEALER the wiseco piston/ring set is around $80 alone...prob close to $90. Then head and base gaskets are around another $20. Then if you need is bored that is about another $65 (dealer cost here)
you are looking at close to 150-200 IF you do it your self and IF YOU BUY A NEW PISTON
I didnt get a wiseco, i got a yamaha piston. But u know wut i meant, its not that expensive just to replace the top end, under $100. I wasnt counting boirng either, just the piston, rings, etc. later-
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Old 01-25-2004, 07:53 PM   #19
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I know this is an old post but i have a question can i just replace my piston on stock bore?And have it work fine or not Because im on year 4 wit original top end i belive
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Old 01-25-2004, 07:59 PM   #20
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yes, u can just hone the cylinder out, have a respectable dealer who has a honer do this and u can run stock bore size,
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97 mx blaster 30mm mikuni carb,
WSM aluminum piston,bored.50 over,
AC racing nerfs- grab bar,
FMF exhaust,
boyesen reeds/ spacer,
Trenga intake,
front end extended 4"
PD tether,
K+N Filter,lid-less
BAnshee front shocks
front 19" holeshtos
cut front and rear fenders,
alloy bars,
18" turf tamers on doug redlabels
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