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General Category >> Rubber Side Down! >> 8.5 9.4?
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Message started by suzi-q on 07/04/19 at 07:31:31

Title: 8.5 9.4?
Post by suzi-q on 07/04/19 at 07:31:31

hey did the savage get a higher compression piston in 2014? like a 9.4? if so, what does the piston look like. and is it faster, better?

Title: Re: 8.5 9.4?
Post by batman on 07/04/19 at 15:27:29

All STOCK pistons are 8.5:1 , The DR650 pistons 94mm to 97mm are 10.5:1 compression when used in the DR650 , But maybe closer to 9.5:1 when used in the savage due to the difference in engine design . You need to understand that these PEAK compression ratios, occur only where the motors arrive at peak torque , about 3300-3400 rpm for a stock bike and about 3400- 4000 rpm on a savage motor with DR piston /and cam change. Static compression pressure(tested at cranking speed ) can very widely ,depending on parts used/altered, and motor condition .

Title: Re: 8.5 9.4?
Post by LANCER on 07/04/19 at 15:52:54

JENope, the stock piston has always been flat.
8.5:1 is stock CR.
I HAVE Wiseco pistons rated at 10.5:1 CR, and they come in bore sizes of 94mm (stock bore so cylinder does not need to be bored, just a good hone-much cheaper), 95mm, 96mm & 97mm.
PRIce for any size is $199 with shipping included within the US.

94...652cc
95...665cc
96...680cc
97...695cc

I recommend the 94mm piston. It is significantly less expensive overall and you get 95% of the benefit from the compression increase alone. The small increase in displacement adds only about 5% in performance.
The difference from stock is noticeable on the road.

If interested I also have Cams worked be Webcam, and Carburetor Kits using Mikuni VM 36 or 38mm carbs plus everything needed to make a swap.

Cam: $299
Carb kit: $399

The cam, carb kit and piston all provide a nice bump in engine efficiency with the total affect of all 3 combined to make the LS650 engine act like a real motorcycle. Cruising at 70-80 is easy, passing on the highway is quick, and Your torque increase runs from shortly after idle to redline.
When combined with a good quality and good flowing muffler instead of the stock muffler overall performance improves a bit more. Most folks use an HD Dyna or 1200 Sportster muffler. Virtually new “take-offs” are cheap and work great on our engine. Check a local HD dealer (they usually have piles of them) or check eBay, they are always there.