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General Category >> The Cafe >> LS650 & DR650 - engine similarities/differences?
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Message started by DesertCat on 08/19/19 at 19:18:30

Title: LS650 & DR650 - engine similarities/differences?
Post by DesertCat on 08/19/19 at 19:18:30

I know the bikes themselves are completely different: cruiser vs dual-sport. But do the engines have any thing (parts?) in common? If so, how much? Or are the engines completely different and share no common parts?

Title: Re: LS650 & DR650 - engine similarities/difference
Post by justin_o_guy2 on 08/19/19 at 20:18:14

I believe some of these crazies have figured out a way to get the Dr cam into the LS head.

Title: Re: LS650 & DR650 - engine similarities/difference
Post by Fast 650 on 08/19/19 at 20:31:03

Not very many parts in common. The pre-96 DR valves and springs are the same. The pre-96 cam will fit but has more lift and duration. The DR piston can be used for the bigger bore higher compression builds. And that is about it for parts interchangeability.

Title: Re: LS650 & DR650 - engine similarities/difference
Post by DesertCat on 08/20/19 at 06:44:05

Thanks!

Title: Re: LS650 & DR650 - engine similarities/difference
Post by justin_o_guy2 on 08/21/19 at 04:59:34

Is the DR piston the best option?

Title: Re: LS650 & DR650 - engine similarities/differ
Post by Dave on 08/21/19 at 05:44:50

706F696E73744575457D6F63281A0 wrote:

Is the DR piston the best option?

The best option for what?

Putting the stock DR piston in the Savage won't do much....putting the Wiseco version in will - but it is not as easy to install as a cam.

I don't know of anybody that has done a direct comparison of a Wiseco piston with a stock cam vs. a stock piston with a performance cam.....so folks would just be guessing as to what is the better option. It usually comes down to doing the cam while you are replacing a damaged one or replacing the leaky head plug. Piston changes require a lot more work.

Title: Re: LS650 & DR650 - engine similarities/differ
Post by MMRanch on 08/21/19 at 06:57:30

I though we could get a 94 mm High Dome Wiseco piston now ? The thought of adding a DR CAM would really change the Fun Factor from "O-Yea ;)" --- to --- "Yee Haa :o"

Do ya'll recon it would make the MPG get better ? I'm only getting in the low 50's now . :-?

Title: Re: LS650 & DR650 - engine similarities/difference
Post by LANCER on 08/21/19 at 07:52:11

A stock piston and the original Stage 1 cam made a nice performance ance increase. I later added the Wiseco piston and started testing various carbs which added more performance.
I have 94mm Wiseco pistons and Stage 3 cams in stock now.

The stock 90-95 DR cam has basically the same duration as the Stage 3 but a bit more lift as I remember.

Title: Re: LS650 & DR650 - engine similarities/difference
Post by och on 05/21/22 at 10:15:21

I test drove the DR650 yesterday. It is a very similar engine size/design to our Savage/S40, but man it has so much more power and so much more torque right from the start. It felt legit fast.

Title: Re: LS650 & DR650 - engine similarities/difference
Post by MMRanch on 05/21/22 at 11:46:16

Hay , Versey is getting GREAT MPG from the BEAST , maybe he has one of those High Dome Pistons ?

Title: Re: LS650 & DR650 - engine similarities/difference
Post by verslagen1 on 05/21/22 at 20:02:27

I have the wiseco 95mm piston, lancers stage 1 cam, and an edelbrock carb tuned for mpg.