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Message started by LANCER on 10/30/15 at 13:08:10

Title: Big Bore High Compression Piston/Cylinder Kit
Post by LANCER on 10/30/15 at 13:08:10

Big Bore High Compression Piston/Cylinder Kit

http://images1.snapfish.com/232323232%7Ffp%3B77%3Enu%3D3557%3E%3B%3C6%3E5%3C7%3E2648%3B%3C66%3B8248ot1lsi

http://images1.snapfish.com/232323232%7Ffp8%3A%3B%3Enu%3D323%3A%3E639%3E697%3EWSNRCG%3D328538%3B286339nu0mrj

The Big Bore Pistons come in 3 sizes; 95mm, 96mm & 97mm.
95mm: 667cc
96mm: 680cc
97mm: 695cc

The raised head on the piston raises the compression up about 2 points and the larger size of the piston itself adds about 1/2 point. These are billed as 10:1 compression pistons for the DR650. The LS650 has a smaller bore to start with (94mm vs 95mm for the DR) so I add in the additional 1/2 point for our extra size increase, making the total of 10.5:1 compression.

The cylinders are bored, honed, silicone carbide treated, blasted and painted by Bore Tech. Bill has been doing this for many years and is a true expert in his field. He backs up everything he does so if you have any questions or have an issue please let me know as soon as possible so we can get it taken care of.

I cannot access the photos of the cylinder right now but will add them when I can.

The price for the kit is $575 with your cylinder used in the process.
I occasionally have a spare cylinder, and if that is needed then the cost will be more.

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by xaman on 10/30/15 at 19:13:45

I just sent you an email :)

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by LANCER on 10/31/15 at 16:20:45

776E626E610F0 wrote:

I just sent you an email :)

I just got to the computer for the first time today and I have your email.

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by verslagen1 on 11/18/16 at 10:36:18

Who does the silicone carbide treatment?

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by LANCER on 11/18/16 at 14:46:21

485B4C4D525F595B500F3E0 wrote:

Who does the silicone carbide treatment?

Bore tech, in Ohio

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by AlexDavis on 06/09/17 at 00:51:47

Hi there. I am new to this Forum so i am still trying to figure out how it works. I currently have a 1998 Savage. Rebuilding the engine and want to go big piston but ran into a problem; I can't find the right piston for the bike. Sounds like they don't make aftermarket pistons for that year. Maybe you can show me the right pass of Finding a piston for my Savage. Thank you

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by LANCER on 06/09/17 at 05:59:06

You are looking for Wiseco pistons listed for the DR650, model years of 1990-1995. As I noted in my post they come in 3 sizes; 95/96/97mm.
Take note that the benefit gained from this piston is PRIMARILY from the 2 point boost in compression, from 8.5:1 to 10.5:1. The size increase is minimal in its effect.

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by LANCER on 06/09/17 at 06:08:58

I forgot to add that those DR pistons that were made in '90-95 were the very same type as used in the LS650, except that the size was just 1mm larger.

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by Hamman on 06/16/17 at 09:31:38

darn, should have done this when we rebuilt our engine...Next time I suppose. Definitely a good deal for sure 8-)

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by LANCER on 06/16/17 at 16:16:19

29000C0C000F610 wrote:

darn, should have done this when we rebuilt our engine...Next time I suppose. Definitely a good deal for sure 8-)

Yep, I said the same thing in 2002 when the first engine rebuild became necessary.
I changed the carb to an Edelbrock, Stage 1 cam, and had the cylinder bored/honed/silicone carbide treatment, but did not think of a higher compression version for the piston. It was a few years before I was able to put in a 10.5:1 piston. I like it better than the stock one. 8-)

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by Armen on 06/17/17 at 07:01:11

Lance,
Didn't you also skim the head and barrel to raise the compression more, and tighten up the squish band?
-Armen

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by LANCER on 06/17/17 at 18:47:52

21120D050E600 wrote:

Lance,
Didn't you also skim the head and barrel to raise the compression more, and tighten up the squish band?
-Armen

Yes I did. It seems that the head was 0.015" & the cylinder 0.025" for a 0.040" total. It may have added a half point, which would bring the compression up closer to 11:1. It feels pretty strong when cranking and the pop from the engine is VERY crisp and strong.
I should be able to fire it up again in a couple of days.

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by Armen on 06/18/17 at 06:17:04

If I was going to guess, I'd say skimming the barrel has a more noticeable effect, as it tightens up the squish band. The fact that you were able to remove that much off the barrel, and not have piston-to-head interference, tells me the squish band must be way too generous (stock) for any serious performance.
Right now, I'm leaving the top end alone, as I have a ton of other stuff to do. But, when it is motor time, I'll cc the heads, measure squish band, etc.
Guns ho!

Title: Re: Big Bore High Compression Piston/Cylinder Kit
Post by LANCER on 06/18/17 at 19:55:21

11223D353E500 wrote:

Give it both barrels dude !