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Message started by LANCER on 06/17/16 at 12:48:38

Title: 94mm Wiseco Pistons
Post by LANCER on 06/17/16 at 12:48:38

I have just 6 left of the 94mm Wiseco pistons on the shelf waiting to go out.
They are Forged High Compression Pistons, just like the 95/96/97mm Big Bore, except that they have a 94mm bore just like our stock piston, so they DO NOT REQUIRE BORING YOUR CYLINDER.
All you need do is give your cylinder a good hone, install and power off with a significant boost in compression.
It goes from the stock 8.5:1 up to 10.5:1 ... and that is SIGNIFICANT !
Put some POWER behind that THUMP THUMP THUMP !!!

These pistons are $199 + shipping.

In the US shipping/insurance is $15.
International shipping cost will be determined on a case by case basis.

Check out Old Indian's posting about his experience with one.

Title: Re: 94mm Wiseco Pistons
Post by jwenrich on 08/23/16 at 15:58:46

I've been wanting to do the big bore 97mm change for a while now. Came across this post and now I'm wondering; Is there a significant difference between the 97mm High Comp and the 94mm? It would be nice not to have to bore out the cylinder, but how much power would the larger bore get me vs just a higher compression?

Title: Re: 94mm Wiseco Pistons
Post by LANCER on 08/23/16 at 20:30:55

0815070C100B010A620 wrote:

More than likely 5%, maybe a little more, that is why I had the 94mm made. The boost in compression is by far the biggest generator of power.
The size difference between the 94mm bore and the 97mm bore is only 42cc in the end, which is maybe 8% of engine volume. Going from 8.5:1 to 10.5:1 CR is a 20% increase in compression. It is not exactly apples to apples but the differences are significant.
And then there are the costs: $575 vs $200-250...almost 3 TIMES more with the big piston.
It's kind of a slam dunk with everything considered.

Title: Re: 94mm Wiseco Pistons
Post by jwenrich on 08/24/16 at 08:27:48

Does the higher compression require additional changes to the carb setup? Or would the carb upgrade become optional, as the cylinder volume hasn't changed?

Would the piston be essentially "plug-and-play" with all the parts supplied?

Title: Re: 94mm Wiseco Pistons
Post by LANCER on 08/27/16 at 17:33:54

Sorry, I forgot to answer your other question.
Carb upgrade is always optional, whether the cylinder volume changes or not. You do benefit from having a carb that is built for performance, not one designed and built for economy. A performance carb will provide more fuel flow in a given time when compared to a CV carb, and do it more quickly, resulting in a very noticeable increase in responsiveness.
-So, no you do not have to change carbs but you get more responsiveness and power by doing so.

If you keep the CV, you will likely need to reset/tune with the high compression piston.

Title: Re: 94mm Wiseco Pistons
Post by mastercarstech on 09/22/16 at 17:34:17

Lancer, with the high compression pistons are there any problems with valave clearence with either the stock cam or the high performance ones you sell? Also, does the piston come with rings?

Title: Re: 94mm Wiseco Pistons
Post by old.indian on 09/22/16 at 19:46:40

As an FYI I have a high lift cam AND the Wiseco piston ...NO valve clearance problems even when wound to 7,500 RPMs...

Title: Re: 94mm Wiseco Pistons
Post by Dave on 09/23/16 at 03:09:38

All of the Wiseco piston sizes work with all of the available cams. They are all "plug and play" - you bolt the parts in and go.

The Wiseco pistons come with rings, pin, clips.

And, if you are somewhat penny pinching but want the most bang for your buck - I would install the piston first, a performance cam next...and do the carb last. I rode for a year with a 95mm Wiseco and a bigger cam, and the stock carb - and the engine ran great. The next year I put on the Mikuni round slide carb, and it did change the way the engine responded - but not as much as the piston and cam did.

Title: Re: 94mm Wiseco Pistons
Post by mastercarstech on 09/24/16 at 20:15:29

Ok, great advice! Thanks Dave. ;D

Title: Re: 94mm Wiseco Pistons
Post by Bubba on 09/27/16 at 14:36:20

Just saw this...

Will the higher compression piston create higher head temps?
Any negative on that?
I've been messing with 2-strokers of late so my mind is working that way now...lol

I find the idea of bumping performance w/o a rebore very interesting in addition to being less work...I was thinking about getting a new nitride cam chain and figure if I pull the engine for that this would be an easy peasy upgrade...

Would you have to hone the cylinder? and if so, how?

Also, can you post a link to oldindian's experiences with the high compression piston?
thanks!

Title: Re: 94mm Wiseco Pistons
Post by Dave on 09/28/16 at 03:53:07

Bumping the compression does make more power, and requires the use of premium fuel - but I don't believe it increases heat noticeably, When you are cruising down the road at a steady speed, it requires a certain amount of power - by bumping up the compression you can make that same HP with a bit less throttle....the engine is making the same amount of HP either way, so I don't believe it makes any difference. Under full throttle acceleration if might make a bit more heat - but how long can you hold the throttle wide open? (From a standing start - 20 seconds is about my limit.) :)

You do need to have the cylinder honed to install a new piston/rings. If you don't have a hone - you need to take the cylinder to a shop that can do it.

I have been running a 95mm Wiseco piston for the last 6,000 miles, and I love it.

Title: Re: 94mm Wiseco Pistons
Post by jwenrich on 11/22/16 at 12:56:00

Been doing some research into how to access the piston and it appears to be quite the job.

Do you know of a clear posting on the forum that describes the tear down? I've seen a couple, but you may know of a walkthrough I haven't come across.

Also, which gaskets am I going to need to replace through this process?

Anything else I should consider doing while the engine is out and open? I'm already thinking the head plug from verslagen.

Title: Re: 94mm Wiseco Pistons
Post by Dave on 11/22/16 at 13:19:29

The best "instructional" document is the Clymer manual. It provides a step by step instruction for taking things apart and putting them back together.

You will need a head gasket, cylinder base gasket, a tube of Suzukibond, and the odd shaped O-ring that fits between the cylinder head and head cover at a minimum. Depending on the year and how old the other rubber parts are...you may need/want to replace the valve adjustment cover O-rings, the sealing washers on the head cover screws....and you should put in a Versy cylinder head plug to prevent future oil leaks in that area. I am also beginning to believe the copper washers on the cylinder studs should be replaced (or the original ones annealed and made smooth before re-using them), as a few members have developed oil leaks at these copper washers.

Title: Re: 94mm Wiseco Pistons
Post by old.indian on 11/22/16 at 13:35:20

Since you are that far apart, I recommend that you check the cam chain adjuster while you're at it. In fact thinking about it, all the tension will be off the cam chain and the stock adjuster is very likely to come apart. (Not Good).

Title: Re: 94mm Wiseco Pistons
Post by jwenrich on 11/28/16 at 12:16:40

Thanks for the heads up on the cam chain tensioner.

Ok, did some shopping. My bike is a 2012, with about 5-6K on it. Most gaskets should be in great condition, so any I can re-use would be great. I put the 3 biggies in a cart though.

Are these the three I need to replace? Am I missing any vital gaskets that wont be re-usable?

http://www.suzukipartshouse.com/oemparts/a/suz/50d33079f8700232d0b3db20/cylinder-head#

Part # 9, 10

http://www.suzukipartshouse.com/oemparts/a/suz/50d3307af8700232d0b3db21/cylinder

Part # 8

Thanks!

Title: Re: 94mm Wiseco Pistons
Post by Dave on 11/28/16 at 12:21:29

Those are the major gaskets - you could also need a clutch cover gasket gasket....as you will need to remove the right side of the engine to release the cam chain tensioner. There is no guarantee that the gasket won't tear when you remove the cover.

And you should order a Versy head plug to stop future oil leaks.

Title: Re: 94mm Wiseco Pistons
Post by jwenrich on 11/28/16 at 12:26:24

Added to my cart.
And I think I am going to get the plug. My dad's bike might be needing one too, and maybe a new tensioner. (also owns a 2012 savage. yay for twins)

If I were only changing the verslavy plug, do I need any gaskets? The diagram doesn't look like it would...

Title: Re: 94mm Wiseco Pistons
Post by Dave on 11/28/16 at 12:37:14

Nope...the hole where the Versy plug goes will be exposed when you remove the head cover.

Don't drag your feet about buying the 94mm from Lancer - I believe he only has 1 left. If you miss it you will have to get a 95 or 96mm....or maybe find a 97mm - and all of those will require you to get a cylinder bored. (Or maybe Lancer will get another batch of 94mm pistons made someday....but that will take a while).

Title: Re: 94mm Wiseco Pistons
Post by LANCER on 11/29/16 at 06:56:16

The last 94mm piston just went out the door.
I may have more sometime later but do not know when.

Title: Re: 94mm Wiseco Pistons
Post by uigiroux on 07/21/19 at 17:58:52

I've been trying to find this 94mm piston online, for the DR650 90-95 years, but can only find the ones 95-97mm which require boring. Is there some reason these are not available without having to special order them, and likely in more then just one piston at a time? Any plans to make another order? Dying to do this upgrade... Also, it seems they are now around $100ish as opposed to $200. Did they just go down in cost, or does having to order them in 94mm increase the cost?

Title: Re: 94mm Wiseco Pistons
Post by verslagen1 on 07/21/19 at 20:22:46

You won't find it online, the stock size is 95mm.
94mm is a special order.

Title: Re: 94mm Wiseco Pistons
Post by uigiroux on 07/21/19 at 20:41:04

So to special order one what does one have to do? Is there a minimum quantity order, or can you just pay extra for the one?

Title: Re: 94mm Wiseco Pistons
Post by verslagen1 on 07/21/19 at 21:17:42

I think lancer had to order 10

Title: Re: 94mm Wiseco Pistons
Post by uigiroux on 07/21/19 at 21:23:14

Hmm, well from what I can tell from the previous posts, it's been 3ish years since a batch of these were ordered... I wonder if another batch of 10 could be arranged...? I would definitely be in for one, even two if that would help meet the quota...

Given the performance advantages of this it seems like they'd be available more often, lol.

Title: Re: 94mm Wiseco Pistons
Post by Dave on 07/22/19 at 03:09:57

In the other 94mm thread...it appears Lancer got an order of 10 just about a year ago.

Lancer was out of town last week.......I am sure you will get a response when he returns (or checks the forum).

Title: Re: 94mm Wiseco Pistons
Post by LANCER on 07/22/19 at 15:13:00

I did get another order last year and still have 94mm pistons in stock.
$199 each and that includes shipping within the US.

I have to order 12 units at a time. They need to makes new blanks each time I order and 1or 2 may not be usable so I actually receive less than 12. One time I got 13 instead of 12.

These pistons are not listed with there other parts because they are a special order that Wiseco makes for me.

Title: Re: 94mm Wiseco Pistons
Post by uigiroux on 07/22/19 at 15:41:40

PM sent. I want one! Yes!!!