KLR Power Mod Discussion - Kawasaki KLR 650 Forum
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post #1 of 145 Old 09-27-2012, 08:28 PM Thread Starter
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KLR Power Mod Discussion

Hi everyone!
From what I'm reading, there is very little power to be found by installing an after market exhaust. So what is the route to better power from the KLR? Where is the restriction? Is it the head? The carb? Compression? Cams?
The BMW 650 has 10 more horse out of the box. Yes I know it is fuel injected but that is not the major power gain. I want those 10 horseys!!
Regards....justjeff

It's not a Tractor....It's a LOCOMOTIVE!! Chugga Chugga
Woooo WOOOOO!!!!!

Last edited by Tom Schmitz; 09-28-2012 at 11:53 PM.
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post #2 of 145 Old 09-28-2012, 09:35 PM
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Quote:
Originally Posted by justjeff View Post
Hi everyone!
From what I'm reading, there is very little power to be found by installing an after market exhaust. So what is the route to better power from the KLR? Where is the restriction? Is it the head? The carb? Compression? Cams?
The BMW 650 has 10 more horse out of the box. Yes I know it is fuel injected but that is not the major power gain. I want those 10 horseys!!
Regards....justjeff
There's no replacement for displacement... Lol, a big bore kit would yield the biggest increase. Not sure of the actual HP gains though... 10 HP is a lot! I've ridden a 685 that had been jetted and had a free flowing pipe on it, it was a little snappier than my stocker but not a huge amount

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post #3 of 145 Old 09-28-2012, 09:40 PM
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justjeff -

Truth be told, there's very little power to be found in the KLR engine.

I've done every reasonable mod possible and, while I have no dyno results, I'd be surprised if it is making 10hp over stock.

Fact is, I let a couple of guys who ride stock KLRs take it for a spin.

They both came back and commented how comfortable my seat was...

It's hard to separate what actually makes more power and what makes the thing more responsive. The best bang for the buck is the 22 cent mod, which cures a lean condition and makes it more responsive. A KLX needle will do more of the same. Opening the exhaust will make it breath a bit better and you can take advantage of that with further jetting and opening up the intake side a bit.

My feeling is that the head is the issue. It's not designed to be passing a lot of air and fuel easily, so it's the choke point. The engine is a thumper, too, and they're not known for making a lot of power. A twin of the same displacement will make almost twice the power. Heck, I had a CB350 that made the same power/torque as the KLR does, and it was completely stock. Of course, it would also rev to 10K.

T

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post #4 of 145 Old 09-28-2012, 10:00 PM Thread Starter
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Hi Tom!
I agree with everything you said but the confusing thing is BMW's single cylinder 650cc
engine makes 10 more horse than the KLR. Where is the difference ? It doesn't have more displacement or an extra cylinder. The compression is higher but not extreme. Still runs on pump gas. That extra 10 horse on a 400 lb bike is HUGE. If the head is the issue, will cams make a big improvement? I know it did on the Chevy 350's i used in stock car racing. Has anyone played with this?
Regards.... justjeff

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post #5 of 145 Old 09-28-2012, 10:29 PM
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You can get cams for the KLR, and I've no experience with them. My intuition says they will make the power and torque curves a bit peaky. The KLR has a fairly flat set of curves, which is one of the neat things about it.

The cams are a bit spendy and I think they would be something that you'd try on a head that was ported and had larger valves installed. It's not something I'm planning on doing to mine.

Think tractor. Not a lot of high speed racing tractors out there.

The BMW, well, good fuel injection can do a lot, especially with a larger throttle body. Good head design can help, too. The KLR just doesn't have it.

T

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post #6 of 145 Old 09-28-2012, 11:23 PM Thread Starter
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Thanks Tom!
Definitely food for thought. At this point I suspect some people reading this are asking "Why not just buy a BMW if they're so good?'' The truth is the BMW is not field repairable and the KLR is. Try trouble shooting an injection system five hundred kilometers out in the boonies! That is the reason I bought a KLR a year ago and not a BMW. I think the KLR is a good platform but it needs more power. The goal is 25 to 30% more power without hurting reliability. I know this has morphed far outside my original question but I think this will be a good thread. Perhaps a Moderator could divide it at post 9 and re-title it "KLR ENGINE POWER MODS". Thanks!
Regards....justjeff

It's not a Tractor....It's a LOCOMOTIVE!! Chugga Chugga
Woooo WOOOOO!!!!!
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post #7 of 145 Old 09-28-2012, 11:56 PM
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I had one of the 650s as a loaner bike. I rode it around a fair amount, but never got to like it. The KLR worked better for me as a mid-size dual sport. I know that's largely because I'm so used to the KLR and you can't really get used to another bike in just a day or two.

Have you checked out the Common Mods and Issues thread? There's some engine stuff in there. There's also a thread or two on doing the 685 mod.

T

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“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

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


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post #8 of 145 Old 09-29-2012, 12:29 AM Thread Starter
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So....Here We go!
I know Willys is working with a flat slide carb with some success. What else are people working on? Has anyone tried the cams available at "A Viscious Cycle"? Anywhere else? What about head modifications? Porting? Bigger valves? Higher compression? Is anyone (heaven forbid) RACING these "tractors"? Just kidding Tom! Lets hear from you and what mods are being done. I'm not concerned about the cost but I don't want to spend money on useless mods. 10 more horse would be a big benefit to the 400 Pound PIG!!
Regards....justjeff
PS. Tom:
I havn't searched that thread for a while, so I will and see what surfaces now.jj

It's not a Tractor....It's a LOCOMOTIVE!! Chugga Chugga
Woooo WOOOOO!!!!!
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post #9 of 145 Old 09-29-2012, 12:34 AM Thread Starter
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BMW power

Quote:
Originally Posted by Tom Schmitz View Post
I had one of the 650s as a loaner bike. I rode it around a fair amount, but never got to like it. The KLR worked better for me as a mid-size dual sport. I know that's largely because I'm so used to the KLR and you can't really get used to another bike in just a day or two.

Have you checked out the Common Mods and Issues thread? There's some engine stuff in there. There's also a thread or two on doing the 685 mod.

T
Hi Tom!
Was the power difference noticeable? Could you lift the front wheel just by twisting the throttle?
Regards....Justjeff

It's not a Tractor....It's a LOCOMOTIVE!! Chugga Chugga
Woooo WOOOOO!!!!!
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post #10 of 145 Old 09-29-2012, 12:40 AM
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I didn't notice much of a power difference. Of course, my KLR isn't stock. The BMW would loft the front end pretty well. It wuold ahve done better without my lard ass on it.

The bike really had a different feel than the KLR, and not all in a better way.

T

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“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

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


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