SuzukiSavage.com - 790 Big Bore

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790 Big Bore (Read 94 times)

GIXXER YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 10	790 Big Bore 08/02/21 at 15:18:10 Has anyone seen the 790 big bore kit for the DR650? Will it work on our LS650?
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Fast 650 Senior Member Offline SuzukiSavage.com Rocks! Posts: 393 Valrico, FL Gender:	Re: 790 Big Bore Reply #1 - 08/02/21 at 23:38:10 It sounds like it would be fun, but the DR cylinder will not bolt up to the LS cases. And I doubt that you could bore the LS cylinder to fit a sleeve and piston that much oversize without getting into the cylinder studs.
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Dave

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Re: 790 Big Bore
Reply #2 - 08/03/21 at 03:46:04

The DR650 has a larger bore and shorter stroke than the LS650....so it started out with a larger bore even when stock.

The largest bore that we can get away with on the Savage is 97mm....any bigger than that and the thickness of the cylinder liner is too narrow (and I believe the counterbalancer clearance becomes an issue).

A bore of 97mm combined with the 94mm stroke results in an engine capacity of 694cc.

Someday I will be old......But not today!

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GIXXER YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 10	Re: 790 Big Bore Reply #3 - 08/03/21 at 04:54:40 Glad I asked the question here. I am not familiar with the DR engine's as you. Thanks for the info!
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LANCER Serious Thumper Alliance Member Offline Savage Beast Performance Parts Posts: 10604 Oklahoma Gender:	Re: 790 Big Bore Reply #4 - 08/05/21 at 09:10:19 Suzuki made the DR800 for the European market some years ago. Good luck finding one.
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Gary_in_NJ Serious Thumper Offline LS650 Cafe Racer Posts: 2625 Amongst the Twisty Roads	Re: 790 Big Bore Reply #5 - 08/05/21 at 09:26:20 Lancer, was the DR800 a thumper? I don't think I've heard of a thumper that large. It must have a 5" piston.
Back to top	A life-time student of motorcycling. LS650 Cafe, DRZ400SM, FZ6N, SV650S, CB900C, Ducati ST2, CB550F-SS My LS650=> http://suzukisavage.com/yabb2.2/Attachments/Left.JPG IP Logged

Dave YaBB Moderator ModSquad Online SuzukiSavage.com Rocks! Posts: 17821 Camp Springs, Kentucky Gender:	Re: 790 Big Bore Reply #6 - 08/06/21 at 04:59:42 The DR800 "BIG" is/was a thumper. Not very many came to the US......more were sold in the EU. https://www.motorcyclespecs.co.za/model/suzu/suzuki_dr800s%2091.htm
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Gary_in_NJ Serious Thumper Offline LS650 Cafe Racer Posts: 2625 Amongst the Twisty Roads	Re: 790 Big Bore Reply #7 - 08/06/21 at 06:32:39 105mm x 90mm bore & stroke. Two carbs. Glorious.
Back to top	A life-time student of motorcycling. LS650 Cafe, DRZ400SM, FZ6N, SV650S, CB900C, Ducati ST2, CB550F-SS My LS650=> http://suzukisavage.com/yabb2.2/Attachments/Left.JPG IP Logged

Ruttly Serious Thumper Offline Thumpers Rule Posts: 4997 Manteca , CA Gender:	Re: 790 Big Bore Reply #8 - 08/06/21 at 11:40:34 A Big 800 engine in a Tempter Chassis , just for fun
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Ruttly Serious Thumper Offline Thumpers Rule Posts: 4997 Manteca , CA Gender:	Re: 790 Big Bore Reply #9 - 08/06/21 at 11:58:21 I had investigated this when I built my engine. A guy in EU was doing a 818cc but much case,crank,cyl machining to accommodate the new sleeve/cylinder. Way to much $$$$ ! Better off with a 95,96 or 97 mm big bore , way more cost effective. My 2 cents
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Old Savage Eddie

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Re: 790 Big Bore
Reply #10 - 08/07/21 at 06:36:33

This post got me thinking 🤔 so I looked into DR800 big in Europe. I could not find a spare engine at a fair price, and the cheapest bike was about $2300 plus shipping- no doubt this is way to expensive for me to even consider as a project engine swap.

What was new to me is discovering that Suzuki sold the biggest displacement thumper of any manufacture:

There was a DR750 big - 727cc and 52hp@6600rpm in 1988/89

The success led to a DR800 big - 779cc and 54hp@6600rpm in 1990/96

A very cool bike…

More horsepower, less exhaust.

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