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Discussion Starter #1
Hi looking at up grading the old bike with a Wossner 102 mm high compression piston.

Normal klr pistons are flat top but this one has a semi domed top that bumps up the compresion
ratio to what I have read on the forum to around 11:1? Although I have no idea if this is correct or how
that ratio was calculated.
My questions is does the upped compresion ration really have a seat of the pants improvement that could equate
to a bike with a higher cc than the 685 kit thats been around for some time. ie would it feel like a 690cc or higher..
what could you expect.
A 705 kit would be great but right now the cash gods have not been smiling on me so its 685 or the wossner for me.
Also if going to the 102mm wossner would fitting the larger valves in the head really make much of a difference?
Any opinions would be gratefully recieved......
 

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I have not made the jump yet because I have found a cheaper way to reduce oil consumption by changing the sprockets, but I am interested in piston options. I have read on the wossner and it seems everyone is using higher octane gas (91+) to prevent any pings given the higher compression. It also seems the kit is cheaper than the 685, but you still have to bore the cylinder since it is a 102mm versus stock 100mm. If you try it, please post a report on experiences and outcomes. It would be great to add to the KLR knowledge pool.

From what I read, people who done the change were happy, here is one guy who tested it.

 

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Artrix,
What year is YOUR BIKE?
IF older than 1996, Don't do it!
Not With-out a 1996 or newer cylinder or an 'LA Sleeve' installed in old cylinder!
The lower cylinder skirt, gets TOO THIN, from what I have read!
 

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Discussion Starter #6
Artrix,
What year is YOUR BIKE?
IF older than 1996, Don't do it!
Not With-out a 1996 or newer cylinder or an 'LA Sleeve' installed in old cylinder!
The lower cylinder skirt, gets TOO THIN, from what I have read!

Cheers mate good tip
 

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Wossner FTW

My 101mm Wossie is a blast. I can run 89 but I can make it ping in 4th at WOT which no one should be doing anyway. 93 is premium here and I'm not that cheap to care about running it when I get 42mpg while flogging it as much as I like. My Honda Odyssey gets 14mpg and my Taurus gets 18 mpg in town and the dumb Taurus has pinged on 87 since it was new 15 yrs ago. I run premium in the bull because my wife drives it. But when I fill it up it gets half 93 and half 87 which it doesn't ping on (it does ping on 89)...so I guess a I am a little cheap :HappyRoll:

PD has a good point on the pre-96 and the 102mm but you can use the 101mm just fine on the Pre-96.
 
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