685/688 kit cant decide. - 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 9 Old 02-08-2012, 06:38 AM Thread Starter
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685/688 kit cant decide.

I'm up in the air on these two bb kits, I can't decide which to do. With the 688 I read on another forum that its the biggest you can go with the stock sleeve. With the 685 you still have some meat on the sleeve. But the 688 was a better design for the Klr?? Whatever that means.
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post #2 of 9 Old 02-08-2012, 09:47 AM
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Originally Posted by johnnybravo View Post
I'm up in the air on these two bb kits, I can't decide which to do. With the 688 I read on another forum that its the biggest you can go with the stock sleeve. With the 685 you still have some meat on the sleeve. But the 688 was a better design for the Klr?? Whatever that means.
'Meat on the sleeve" makes little difference, when NO OVERSIZE PISTONS AND RING SETS ARE AVAILABLE for either 685 or 688, AFAIK!

Schnitz is a long-time supplier of 685 kits with proven service lives galore; 688 is the product of a favored .Net website vendor; may be perfectly o.k.; less maintenance history on the 688.

685 pistons are forged; don't know about the 688's, but given a choice, I'd favor forged over cast pistons (for strength and homogeneity), but . . maybe that's just ME!

------------

WAIT A MINUTE--I don't know NOTHIN' about the 688 kit!

Last edited by LoneRider; 02-08-2012 at 09:52 AM.
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post #3 of 9 Old 02-09-2012, 11:18 AM Thread Starter
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Has anyone here installed the 688? any issues? Thanks.
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post #4 of 9 Old 02-09-2012, 12:24 PM
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Has anyone here installed the 688? any issues? Thanks.
Just wondering, JB; what are your expectations from the big bore kit?

Do you have an excessive oil consumption problem? Known worn rings?

Can't comment on the 688, but; ain't nothin' wrong with the 685, AFAIK, from my observation and my riding partner's testimonial. But . . . you're increasing displacement by 5 %; what performance enhancement do you expect?
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post #5 of 9 Old 03-20-2012, 12:33 PM
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Eagle Mike sells the 688 kit and his add says its a forged piston. It also says it was designed to be used when a 685 big bore needs redone. It may extend the life of your engine when used that way, although I have talked to people who have 90,000+ miles on their stock pistons so another kit is likely not necessary for most.

I have the 685 and have been been very happy with the performance improvment over stock. I have 18,000 on it with zero oil use or problems of any kind.
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post #6 of 9 Old 03-20-2012, 11:11 PM
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Has everyone who installed a 685 kit also installed the Thermo-Bob kit to keep the temp a little more stable?
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post #7 of 9 Old 03-21-2012, 08:10 AM
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I have the thermobob installed. I have had it for about three years. It warms up faster and the temperature stays hotter than it did. I have heard that this is a good thing but I couldnt say for sure. It really makes no difference in how the bike runs as far as I can tell. At times the bike seems to run too hot.
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post #8 of 9 Old 03-21-2012, 08:20 AM
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Mini-hijack: While the Thermo-Bob doubtlessly stabilizes coolant temperture more fully, and at a higher temperature than the OEM system . . . any effect on performance, durability, and reliability remains theoretical. Maybe valid, but--no tangible data verifies the theory, AFAIK.

Any component failures, engine malfunctions, or truncated service life traceable to the stock cooling system, operated within safe limits?

Just askin'!
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post #9 of 9 Old 03-22-2012, 10:48 PM
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Originally Posted by LoneRider View Post
Mini-hijack: While the Thermo-Bob doubtlessly stabilizes coolant temperture more fully, and at a higher temperature than the OEM system . . . any effect on performance, durability, and reliability remains theoretical. Maybe valid, but--no tangible data verifies the theory, AFAIK.

Any component failures, engine malfunctions, or truncated service life traceable to the stock cooling system, operated within safe limits?

Just askin'!
totally with you on this one, air-cooled engines always seemed to have done quite well and have temp swings.
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