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Author Topic: Wiseco GP pistons?  (Read 2883 times)

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Offline beaner

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Wiseco GP pistons?
« on: June 13, 2012, 02:55:10 PM »
I should do a piston and ring in my RM soon. I was looking for a deal on ebay, and saw the GP pistons.

http://www.ebay.ca/itm/320924696190?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Is there anything special about them? I usually use the standard pro lite.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline dogger315

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Wiseco GP pistons?
« Reply #1 on: June 13, 2012, 03:45:43 PM »
Quote
Is there anything special about them?
Yes.  The GP series have a number of unique upgrades over the standard Wiseco.
First of all, the picture in the EBay ad is not a GP piston.  It's a standard Wiseco
Pro-Lite.  Changing to a GP piston gets you hard coat anodized, single ring Ti
Nitride coated ring, pinned on centerline and no intake window.

dogger
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Offline beaner

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Wiseco GP pistons?
« Reply #2 on: June 13, 2012, 08:22:04 PM »
What's the significance of no intake window, and are they worth the extra money? I have heard that you can get longer service out of them.
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Offline dogger315

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Wiseco GP pistons?
« Reply #3 on: June 13, 2012, 09:36:39 PM »
Quote
I have heard that you can get longer service out of them.
Single ring pistons aren't known for long service life, they're all about lighter
weight, higher revs and more power.  The only feature that might provide
a longer life is the hard coating on the piston.

As for the missing window, I have no idea.  On the Honda version of this piston,
it's a close copy of what HRC used on the works bikes - single ring and all.  I
wouldn't be surprised if this is a close copy of what Team Suzuki used on their
bikes.

If you are looking for a replacement piston that features a long service life,
you're better off with a Pro-Lite.  It's a forging and will be nice and durable
under most conditions.

dogger
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Offline beaner

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Wiseco GP pistons?
« Reply #4 on: June 13, 2012, 11:07:35 PM »
That's what I normally use. It is also a single rung. I thought I read on the Wiseco site that longer service life is possible.
Thanks.
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Offline Super Trucker

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Wiseco GP pistons?
« Reply #5 on: June 14, 2012, 05:03:43 AM »
That ebay pic is a 250 piston, all 125,s from about 1995 have 1 ring. The gp piston has a thicker dome also, very durable piston.
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Offline 2T Institute

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Wiseco GP pistons?
« Reply #6 on: June 16, 2012, 04:04:59 AM »
The pic is of a Banshee piston. The Wiseco is hardly 'GP" spec, a ring weighs 1-2 grams hardly world beating stuff. The coatings wear off pretty fast on a piston. Average mass of a 54mm piston is 125-130grams a proper GP spec 54mm piston weighs 109g.
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Offline Jeram

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Wiseco GP pistons?
« Reply #7 on: June 16, 2012, 12:33:41 PM »
fairly useless in a stock or midly tuned bike.
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Offline beaner

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Wiseco GP pistons?
« Reply #8 on: June 16, 2012, 01:30:27 PM »
Why?
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Offline Jeram

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Wiseco GP pistons?
« Reply #9 on: June 16, 2012, 02:24:36 PM »
you wont get any extra hp with this piston
no extra hp at higher revs with this piston in a stock motor
the stock motor is already reliable with the stock piston that is heavier/twin ring.
what you gain in reliability with the lighter weight, you loose with the single ring.

only real advantage in my opinion is if you have a motor and pipe combo that makes big power and high revs. perhaps a super kart for instance.

but if you were running a 54mm piston in a high revving bike that needed the best of everything youd be silly not to just buy a GP piston such as an Aprilia RSA125 (54mm) piston (80 euros?) and then match in the height using a different connecting rod length and or spacer plates. Im sure its been done before by someone.
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Offline beaner

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Wiseco GP pistons?
« Reply #10 on: June 16, 2012, 04:14:09 PM »
Stock is single ring. The GP is supposed to offer longer service life, as I have found out since I originally posted.
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Offline Super Trucker

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Wiseco GP pistons?
« Reply #11 on: June 16, 2012, 04:49:05 PM »
Yeah Beaner the Rm  is a single ring, along with yz, and cr,s that I owned from 87 to 06, I,m sure the kx is a single ring too. The skirt- bottom of the piston has a full length-same length skirt. A  top engine builder will tell ya to run a gp piston. The gp piston is heavier than a stock or pro lite piston, just so ya know. Alot more durable tho, just get the gp piston designed for your RM, I don,t think you want to run a diff. rod just to change the piston and run the bill up to 2,400 plus.
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Offline 2T Institute

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Wiseco GP pistons?
« Reply #12 on: June 16, 2012, 10:25:51 PM »
Quote from: Super Trucker on June 16, 2012, 11:49:05 PM
Alot more durable tho, just get the gp piston designed for your RM, I don,t think you want to run a diff. rod just to change the piston and run the bill up to 2,400 plus.

Rod 110mm or 115mm $90
Piston $120
Rebuild crank $50
total $260

Where does the other $2k come from?

Piston cooling is what makes a piston durable.
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Offline beaner

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Wiseco GP pistons?
« Reply #13 on: June 17, 2012, 01:19:22 AM »
Well, it may not matter anyway.

I lost track of the the hours on the piston that's in there (hurt and hardly riding the last 2 years), so I was going to change it and found the GP on ebay. It's about what I would pay for a pro lite at my local shop, hence the questions. I have 2 races left for the RM in this series. One is a 1 hour motocross, and the other is a regular 2 x 20 minute. I was going to buy a Husky and sell the RM. so I was being careful. The Husky sold before I got to it, then I came to my senses. I've spent 5 years making this bike the way I want. Why would I start all over again, now that I'm getting fast on it? After the next race there's a gap, so I'll probably spring for an Eric Gorr 144, porting, and fatty pipe.

I can always buy another Husky and sell the KDX  :P
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