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Old 11-09-2014, 07:43 PM   #1
monkeyodeath OP
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'94 KLR...658 or 685?

My '94 has turned into a mobile fumigator and it's time to get a new piston.

I'm definitely doing an Eagle Mike overbore kit, but I'm wondering if I should either:

a. Get the 658 kit and bore my existing cylinder, or
b. Get a core cylinder from a later bike and bore it for the 685 kit.

Is the 685 kit improvement worth the > $100 I'll need to spend on a core cylinder? Or should I just use what I got?
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Old 11-10-2014, 02:43 AM   #2
Bell driver
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http://www.klr650.net/forums/showthread.php?t=123673
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Old 11-10-2014, 03:10 AM   #3
Beezer
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685 it, do some head work (at least clean it up). airbox, carb, & exhaust mods make it better for not much money if you haven't done it already. change out the spring loaded balancer weights.... do the doo if you haven't yet. I'm sayin do that while you're in there. then save up money for the suspension
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Old 11-10-2014, 04:28 AM   #4
Grinnin
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It's hard to separate opinion from measured results when talking about the root cause of oil consumption. There were enough people who believed that the thin stock cylinder liner is part of the problem that I decided that putting in a thicker liner would be part of my solution.

I cannot tell you that I had to go to the larger piston and thicker sleeve, but I can tell you that it worked 100%. And I like the power.

If I had another KLR that needed the same treatment, I'd swap cylinders with EM.
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Old 11-10-2014, 06:18 AM   #5
mikehailwood
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658 or 685

Lot's of positive comments by reputable forum guys regarding the 658. The 658 will solve your oil consumption problem. If your budget is not an issue and you want a little additional power, then get the 685.
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Old 11-10-2014, 06:29 AM   #6
VACommuter
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Location: Northern Virginia
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I've got three KLRs. 2 have the 685 and 1 has the 719. If you are going to go big, might as well go as big as you can. Pleased with all three bike's performance but I've never been good at seat of the pants comparisons. I didn't notice any huge changes. I hear the updated 685 kit has a newer lighter piston that really reduces vibration. Supposedly very smooth. The guy who did my 719 just did a new 685 kit for someone else and he was amazed at how smooth the engine was on that 685.

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Old 11-10-2014, 07:17 AM   #7
Tsotsie
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50,000 miles on a 685 and still going smooth and strong. Need I say anymore?
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