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Message started by JerseyKenn on 06/29/10 at 13:42:27

Title: big bore kits?
Post by JerseyKenn on 06/29/10 at 13:42:27

i been looking for a big bore kit, but have not seen any yet, might just be me looking in the wrong places, but i was wondering if there is a sites/companies that i can be directed to , thank you for your time

Title: Re: big bore kits?
Post by BurnPgh on 06/29/10 at 14:04:09

Wiseco has pistons that also fit early 90's DR650s. Thier website info is wrong and they have the LS650 listed under dirtbikes (i think) but the piston works and its a hi-comp piston at that. You have to go at least 1mm over as they only have 95, 96, and 97mms and 97 is the largest you can put in there before the sleeve gets too thin. Some members have been concerned about weight difference between the stock and wiseco pistons creating more vibration but I find it a lot more smooth. It also revs up much quicker. Gotta use hi grade gas though.

Title: Re: big bore kits?
Post by danroot on 06/29/10 at 21:12:43

is it just a drop in?

Title: Re: big bore kits?
Post by BurnPgh on 06/29/10 at 22:27:58

Gotta get the cylinder bored and honed by a local machine shop unless you can do it yourself but other than that yea. Just make sure you use the rings, piston pin, and pin clips that come with it.

Title: Re: big bore kits?
Post by LANCER on 06/30/10 at 02:37:48

Be sure that the machine shop you use for the bore/hone is experienced with motorcycle engines
I recommend that you have a silicone carbide treatment done to the cylinder when bored. It is well worth the little bit of money.
It reduces friction & heat and adds to cylinder longevity.
With the treatment there is no breakin period required for the engine when reassembled.

I use Boretech for my engine work
bore, hone & silicone carbide treatment is only about $165

http://www.bore-tech.com/index.htm

Immediate break-in
Improved ring seal
Superior oil retention
Less friction provides lower temperatures
Leaner fuel mixtures possible
Excellent wear characteristics
Anti-siezure properties

Title: Re: big bore kits?
Post by JerseyKenn on 06/30/10 at 10:19:46

BurnPgh,Lancer
thanks for the great info, was very well put together
i did find the Piston kit on the weisco page, and it was under with the DR650, i would never of thought to look there,

i see no one make a kit with a Nikasil big bore cylinder, i quess that would have been to easy,

i really do appreciate the quick and detailed response

Title: Re: big bore kits?
Post by BurnPgh on 06/30/10 at 10:55:35

Not many places do the nikasel thing. Used to be a place here in PA called Lukes Racing but they stopped doing it. I just got a standard bore and hone for $55. Other than Lukes the only place I know that does it is boretech.

Title: Re: big bore kits?
Post by james may on 06/30/10 at 14:03:20

Anyone got any numbers on the performance(HP/TQ) and displacement(CCs) that dropping a 97mm piston into your savage can do?

Title: Re: big bore kits?
Post by LANCER on 06/30/10 at 16:34:24

6263787364626F6673160 wrote:

Anyone got any numbers on the performance(HP/TQ) and displacement(CCs) that dropping a 97mm piston into your savage can do?

694cc

Title: Re: big bore kits?
Post by Charon on 06/30/10 at 17:05:48

694 cc represents about a 6.5% increase over the basic 652 cc. Stroke stays the same, so rpm limits stay about the same. Torque is generally about proportional to displacement; horsepower is the product of torque and (unchanged) speed. Thus I would expect about 6.5% increase in torque and power. If compression increases due to different piston configuration, torque should increase a little more. The tradeoff is the need for premium fuel. If there is no change in the head or the valves, the larger displacement might result in slightly decreased high-rpm breathing efficiency, which may reduce the torque gain, but it might possibly give a little better bottom-end torque.

If I were seriously contemplating such a change, I would want to make a series of careful measurements, specifically including a dyno run, before I started. I would then want to repeat the measurements after the modifications, to see whether I had actually gained anything. Without real before-and-after measurements, you will never really know whether you did anything.

Title: Re: big bore kits?
Post by Phelonius on 06/30/10 at 17:11:58

50514A4156505D5441240 wrote:

Anyone got any numbers on the performance(HP/TQ) and displacement(CCs) that dropping a 97mm piston into your savage can do?

Mine, with fully loaded sidecar, for a camping trip used to top Snoqualmie Pass at 59 MPH at the slowest point.
With the 96mm piston and Port polish and relieving of valve pockets, Jetted up two sizes, stock muffler, would top the same pass with the same load at 65 MPH.
A signifigant improvement, I think.

Phelonius

Title: Re: big bore kits?
Post by bill67 on 06/30/10 at 17:12:09

The worst part of the whole deal is the motor want last very long.

Title: Re: big bore kits?
Post by Phelonius on 06/30/10 at 17:12:12

50514A4156505D5441240 wrote:

Anyone got any numbers on the performance(HP/TQ) and displacement(CCs) that dropping a 97mm piston into your savage can do?

Title: Re: big bore kits?
Post by LANCER on 07/01/10 at 02:44:05

6B6065653F3E090 wrote:

The worst part of the whole deal is the motor want last very long.

Why do you think that ?

What part or parts will fail and why ?

Title: Re: big bore kits?
Post by BurnPgh on 07/01/10 at 09:47:51

7E7570702A2B1C0 wrote:

The worst part of the whole deal is the motor want last very long.

Only if you dont use klots to oil the parts before reassembly. ;D

Title: Re: big bore kits?
Post by SmilinLDR on 07/02/10 at 20:41:56

Will this piston work with all years of Savage/S40?

Title: Re: big bore kits?
Post by BurnPgh on 07/02/10 at 21:07:40

yup

Title: Re: big bore kits?
Post by LANCER on 07/03/10 at 03:27:45

Ain't it perdy ? ?

http://images1f.snapfish.com/232323232%7Ffp8%3B%3B%3Enu%3D323%3A%3E639%3E697%3EWSNRCG%3D3285393%3A%3B5339nu0mrj

http://images1f.snapfish.com/232323232%7Ffp8%3A%3B%3Enu%3D323%3A%3E639%3E697%3EWSNRCG%3D328538%3B286339nu0mrj

http://images1f.snapfish.com/232323232%7Ffp8%3B5%3Enu%3D323%3A%3E639%3E697%3EWSNRCG%3D3285393798339nu0mrj

Title: Re: big bore kits?
Post by klx650sm2002 on 07/03/10 at 09:18:33

Lancer, I do like your piston.
Clive W :)

Title: Re: big bore kits?
Post by LANCER on 07/04/10 at 03:15:12

5354400E0D084B550A08080A380 wrote:

Lancer, I do like your piston.
Clive W :)

I love sexy metal ..... 8-)

Title: Re: big bore kits?
Post by klx650sm2002 on 07/04/10 at 06:10:52

Here's another 97mm piston, it's from a yamaha 450.Stroke60.8
http://i119.photobucket.com/albums/o147/klx650sm2002/YFZ450125to1.jpg
Clive W :)

Title: Re: big bore kits?
Post by Oldfeller on 07/04/10 at 06:17:38

Got a 23mm wrist pin?

Title: Re: big bore kits?
Post by klx650sm2002 on 07/04/10 at 06:25:59

Yamaha 450 wrist pin is 20mm and 50.15 long.
Clive W :)

Title: Re: big bore kits?
Post by Oldfeller on 07/04/10 at 06:31:32

I thought our wrist pin was 23mm ....

Title: Re: big bore kits?
Post by LANCER on 07/04/10 at 08:18:05

7350585A595050594E3C0 wrote:

Got a 23mm wrist pin?

I may have one...need to check

Title: Re: big bore kits?
Post by klx650sm2002 on 07/04/10 at 08:45:03

Some nice valves to go with that big bore kit.
http://i119.photobucket.com/albums/o147/klx650sm2002/Valves.jpg
Come to think of it has anyone put bigger valves in a Savage yet ?
Clive W :)

Title: Re: big bore kits?
Post by LANCER on 07/05/10 at 03:43:18

MORE SHINEY METAL........ :D

Title: Re: big bore kits?
Post by justin_o_guy2 on 07/05/10 at 04:34:44

Ive seen a few of those that werent so shiny or so well shaped anymore. Hate to see that happen to an engine.

Title: Re: big bore kits?
Post by klx650sm2002 on 07/05/10 at 06:50:42

More shiny bits, those are titanium valves.
http://i119.photobucket.com/albums/o147/klx650sm2002/TiValves.jpg
Clive W :)