685 kit - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

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post #1 of 16 Old 10-10-2011, 06:19 PM Thread Starter
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685 kit

What are the pros/cons of the 685cc big bore kit? Does it really make a big difference? Where is it available for purchase?
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post #2 of 16 Old 10-10-2011, 07:51 PM
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Schnitz Racing.

Advantages: a little more oomph, but the big advantage as I see it is that it lessens vibration and may improve oil consumption if that is an issue.




"In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV." R. Pirsig

PPMC #1.
Soon, we ride.

AKA JD Mader or you can call me "Dan" just not early for dinner.

Click my handle for a link to my homepage/blog...which has nothing to do with MCs. Free literature and music! Viva La Revolucion!
-------------------
2008 KLR 650
RIP DM - Soon, we ride.
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post #3 of 16 Old 11-03-2011, 02:46 PM
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Quote:
Originally Posted by Lockjaw View Post
Schnitz Racing.

Advantages: a little more oomph, but the big advantage as I see it is that it lessens vibration and may improve oil consumption if that is an issue.
Define a "little more oomph" if you could... is it an easily noticeable improvement? How about reliability?

'05 Busa
'03 KLR 650
'81 Seca 550
'78 Hawk
'71 SL 350
'69 Z50A
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post #4 of 16 Old 11-04-2011, 03:52 AM
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MJN,
I've never read any negatives. The reduced vibes'll bring up the lifespan
of any machine.
In stock trim first and second gear try to rip my shoulders outta socket
so it's all good down low.
RPM's are still going to be limited by the engine design itself, but the general
consencus is that it gets to top speed a whole lot sooner. Top speed
should push up too with higher torque at the speed of most wind resistance.

The crank, rod, and main bearings can easily take the additional force.

This is all from what I've read here at the site, and the experience of others.
I haven't made the jump in cc's but will at rebuild time. Doing fine as-is
but "there's no substitute for cubic inches". LOL It'll happen.

Los Cheapos Muchos

I hear the 702 is even smoother.

This is my son, with whom I am well pleased." ----God
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post #5 of 16 Old 11-04-2011, 10:57 AM
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I like mine. I installed it, because it was a 2008 oil burner. I had to add oil to my bike all the time. However, I've not added a drop in the last 7,500 miles. I do have a little more HP, yet that alone would not be enough to justify costs. And there probably is less vibration, but I don't notice it. If you like to tinker and projects are fun, do it. If you're not using oil, I don't see a big need for it. That said, I am glad I did it. I've had good results and it's been 7500 miles of good riding since. BE SURE to follow the break in procedure after you do the install. Put some cheap oil in it and drive it the 50 or so miles they recommend (read instructions for exact amount). Then change that oil. You will find metal shavings for that initial break in. After that your oil will be clean - or at least mine was. I run full syn Motul 300V in mine, since that break in oil change.
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post #6 of 16 Old 11-04-2011, 11:40 AM
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I've only ridden Tom's, so this is very subjective/qualitative. I expected more "oomph" to be honest. It is definitely there, but I wouldn't do it for that reason. The decrease in vibes is nice. It doesn't change the bike THAT much. You won't be lifting the front tire (unless you try to), but your butt will be less numb.

Sorry, it's not very helpful. If and when I do mine, it will be to stop the oil burning.




"In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV." R. Pirsig

PPMC #1.
Soon, we ride.

AKA JD Mader or you can call me "Dan" just not early for dinner.

Click my handle for a link to my homepage/blog...which has nothing to do with MCs. Free literature and music! Viva La Revolucion!
-------------------
2008 KLR 650
RIP DM - Soon, we ride.
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post #7 of 16 Old 11-04-2011, 12:57 PM
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The three prior posters are pretty much spot on.

Do it because your bike is burning oil and you want to fix it (remember, though, that the cost of the kit, machine work and installation will buy a LOT of oil) or because you love to tinker and just wanna.

Don't do it for power. The KLR engine doesn't make power, and nothing you do will change that. After all, it's only 35 ccs being added. If power is linear with displacement, that would say 2 hp are being added, and that's not far off the mark.

The power increase is most noticeable in what I would call passing situations. Accelerating from 70 to 90 is very easy.

Before the 685 mine would not pull a grade in 5th gear with the 16 tooth sprocket, so I didn't like the 16 tooth and removed it. With the 685 it will easily pull the same grades in 5th with the 16 tooth, so the 16 tooth is pretty much a permanent installation on mine.

Mine loves to rev. It's very smooth (smoother than my other bike, a horizontally opposed twin that shakes like a dog shittin' tacks) and pretty much a hoot to keep above 4000 rpm. It's seen 8000 rpm a time or two.

T

Tom [email protected]

“On the way downtown I stopped at a bar and had a couple of double Scotches. They didn't do me any good. All they did was make me think of Silver-Wig, and I never saw her again.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
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Last edited by Tom Schmitz; 11-04-2011 at 01:05 PM.
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post #8 of 16 Old 11-04-2011, 02:52 PM
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Thanks guys. That pretty much tells me what I need to know.

I haven't put enough miles on it to figure out wether it uses oil or not, but I wanted to know what to expect if I upgraded.

While it'd be cool if this thing would power-wheelie, I can deal with the power where it is... besides, I've got the Busa to give me my accel/speed/wheelie fix.

'05 Busa
'03 KLR 650
'81 Seca 550
'78 Hawk
'71 SL 350
'69 Z50A
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post #9 of 16 Old 11-04-2011, 07:51 PM
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Quote:
Originally Posted by mjn View Post
Thanks guys. That pretty much tells me what I need to know.

I haven't put enough miles on it to figure out wether it uses oil or not, but I wanted to know what to expect if I upgraded.

While it'd be cool if this thing would power-wheelie, I can deal with the power where it is... besides, I've got the Busa to give me my accel/speed/wheelie fix.
LOL, you've got a Busa! Screw the 685 kit. Buy some oil and ride. That's like trying to pretty up your ugly cousin for the hoe-down when you could be going with the vampy pin up that puts out for Boones Strawberry Hill.




"In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV." R. Pirsig

PPMC #1.
Soon, we ride.

AKA JD Mader or you can call me "Dan" just not early for dinner.

Click my handle for a link to my homepage/blog...which has nothing to do with MCs. Free literature and music! Viva La Revolucion!
-------------------
2008 KLR 650
RIP DM - Soon, we ride.
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post #10 of 16 Old 11-04-2011, 08:07 PM
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Aw, mjn, you're so gullible!

We were all pullin' yer leg there with the "685 kit doesn't make more power" stuff.

Here's my video of my first run with the KLR after I put the 685 in....


T

Tom [email protected]

“On the way downtown I stopped at a bar and had a couple of double Scotches. They didn't do me any good. All they did was make me think of Silver-Wig, and I never saw her again.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
Noli Timere Messorem
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