Big Bore kit for 650's - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
V-Strom Modifications and Performance The brag page, good and bad.

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post #1 of 24 Old 03-21-2016, 09:00 AM Thread Starter
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Big Bore kit for 650's

This looks interesting.........


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post #2 of 24 Old 03-21-2016, 10:51 AM
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I looked at this several years ago when I had a DL650. Kinda pricey and a lot of labor, but if your planning on rebuilding a 650 anyway it might make sense.

However, given the prices available on left over Vee2s, the math doesn't make sense if your not already planning on rebuilding an older 650.. As modified, my Vee2 is within 2 pounds of the DL650. And it was all bolt on and plug in modifications.
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post #3 of 24 Old 03-21-2016, 11:15 AM
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From my HD days I can tell you once you start down that road you stick a knife in your reliability.

Ill wait for Suzy to unleash a 1200cc V Strom.
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post #4 of 24 Old 03-21-2016, 11:32 AM
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The first weak spot on DL650 performance improvement is the connecting rod. Push the envelope very far and you'll have a paperweight instead of an engine.
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Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
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post #5 of 24 Old 08-04-2016, 10:41 PM
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This would be interesting if you could build the engine to have only slightly more horsepower, but dramatically improve the low and mid range torque.
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post #6 of 24 Old 08-04-2016, 10:48 PM
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Quote:
Originally Posted by Highside71 View Post
This would be interesting if you could build the engine to have only slightly more horsepower, but dramatically improve the low and mid range torque.
Torque is a function of displacement and BMEP. You're not going to improve BMEP hardly at all, so that leaves displacement. A "dramatic" improvement implies a lot bigger increase than a big bore will give. If you want more torque, buy a 1000.
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post #7 of 24 Old 08-04-2016, 11:04 PM
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Quote:
Originally Posted by RichDesmond View Post
Torque is a function of displacement and BMEP. You're not going to improve BMEP hardly at all, so that leaves displacement. A "dramatic" improvement implies a lot bigger increase than a big bore will give. If you want more torque, buy a 1000.
"Dramatic" was a poor choice of words, noticeable would be more like it.

Plus given the fact that the 650 can run on 87 octane, that shows that there's room to bump up the compression.
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post #8 of 24 Old 08-05-2016, 03:26 PM
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Quote:
Originally Posted by Highside71 View Post
"Dramatic" was a poor choice of words, noticeable would be more like it.

Plus given the fact that the 650 can run on 87 octane, that shows that there's room to bump up the compression.
True, that will give you a bit. Probably not enough to feel.
Overall, the 650 motor is not a good candidate for significant HP or torque increases. The bottom end is just too fragile, and there's no fix for it. I've got a broken Falicon crank from one of my race SVs as a testament to that.
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post #9 of 24 Old 08-07-2016, 11:37 AM
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The V-Strom can never be regarded as a racer so why mess with it? Suzuki do two sizes for both types of petrol heads, one 650 that will do more than most can handle and the 1000 that can do the same with a little less effort.
Not sure where the extra power or torque is required as both deliver and depending where your riding then gearing may be a cheaper option.
I could understand this mod on the SV "maybe", but not on the Strom. Just my two bits!
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post #10 of 24 Old 08-09-2016, 09:18 AM
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Curious that I see mention of cranks suffering damage when most folks call the Wee bullet proof.
Is this more of the nature of bikes used for racing and power seeking engine mods?
Mine sees higher RPM occasionally but most of the time 5-55K rpm is all I need.
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