600 to 650cc is it possable ?? - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 11 Old 07-28-2010, 04:13 PM Thread Starter
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600 to 650cc is it possable ??

Hi All, I have a 89 KLR600 and would like to upgrade to 650 is it a straight swap barrel, piston, head ? or any suggestions ! cheers
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post #2 of 11 Old 07-28-2010, 06:49 PM
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KLR's have been 650's since 1987. If you have a 1989, you already have a 650.
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post #3 of 11 Old 07-28-2010, 06:52 PM
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post #4 of 11 Old 07-28-2010, 08:22 PM
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"Only Superman could do that", Tom said with a steely grin.

No, seriously, I think you may mean that you have an '86 KLR600. I don't know the answer to your question; I'd have to do some research. I think the answer may be 'yes'. I'll try to look that up.

I do think that an engine swap is possible, though, and might be less trouble, as you would need the barrel, piston, and head at the very least.

The downside is that you'd probably lose the kick starter, as there are likely more late model engines available.

Interesting question.

Tom

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post #5 of 11 Old 07-28-2010, 08:43 PM
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OK, I'm gonna say 'no'.

The 600 had a 96mm bore and a 78mm stroke.

It looks like they bored and stroked it to 100X83 to get to 650. And that's assuming they DID save the case and do a bore and stroke and didn't just start over from scratch, dunno.

If you do the three piece swap you'll be 5mm short on stroke and have no compression, plus you'll have issues with cam and balancer chain length. And who knows what else. If they had just bored it and the 600 had a 100mm stroke, you might have been in business.

To make the 600 into a 650 you'd have to replace everything from the crank up.

I don't even think you could bore the 600 jug for the 650 piston and make something like a 635 (I didn't do the math, that's a guess) because you'd be boring 2mm (.080") on a side.


Sorry, that's all I got!

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Last edited by Tom Schmitz; 07-28-2010 at 08:48 PM.
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post #6 of 11 Old 07-30-2010, 11:21 AM Thread Starter
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600 - 650

Quote:
Originally Posted by klarkekent View Post
Hi All, I have a 89 KLR600 and would like to upgrade to 650 is it a straight swap barrel, piston, head ? or any suggestions ! cheers
No honestly its a 600 here in the UK they ran alongside the 650 mine was prob one of the last !
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post #7 of 11 Old 07-30-2010, 11:29 AM Thread Starter
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many thanks for the reply tom, I thought it may not be easy !! I will leave it as it is and maybe trade it for a later 650 in the future, I am happy with it as is but would have been nice to have a bit more power ! my brother has a 600 transalp and its faster damit ! but the KLR is much better off road ,
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post #8 of 11 Old 07-30-2010, 12:55 PM
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Quote:
Originally Posted by Tom Schmitz View Post
"Only Superman could do that", Tom said with a steely grin.

No, seriously, I think you may mean that you have an '86 KLR600. I don't know the answer to your question; I'd have to do some research. I think the answer may be 'yes'. I'll try to look that up.

I do think that an engine swap is possible, though, and might be less trouble, as you would need the barrel, piston, and head at the very least.

The downside is that you'd probably lose the kick starter, as there are likely more late model engines available.

Interesting question.

Tom
"You snuck that one by me," Tom said puckishly.

And yeah, bikes, bikes, bikes. For real though, that's funny. We all want the 685 and you want a 650. Would love to see a pic of your bike and the transalp if you get to 15 posts.




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post #9 of 11 Old 07-30-2010, 02:00 PM Thread Starter
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klr600

I have a pic from a ride out yesterday, Attachment 570 hope this works chris

Last edited by klarkekent; 08-20-2010 at 04:54 PM.
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post #10 of 11 Old 07-30-2010, 10:46 PM
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Worked. Sweet looking bikes!




"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!
-------------------
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