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Old 03-20-2013, 06:23 PM   #7456
Captain115
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Wicked

Hmmm ok thanks for the info everyone. Didn't think about the increased engine braking from higher comp, not that it bothers me but it's just one of those things that never occoured to me!

All those prices I posted are for the pistons shipped to Australia and adjusted for AU dollars.

Steve, I quoted the Wossner price from a mob here in Brisbane. After having a look on eBay I found a US seller who can post a 98mm Wossner here for $188AUD. Like Cristian said, I really like the idea of Wosser pistons, German engineered and all that.
Plus I'd love to say my engine is 610cc! I've been doing that with the previous 630 kit (before I knew that it wasn't even in there) and people nod apreciateively...it's the little things you know .

Getting a 1mm OS brings it to what, 601ish? Doesn't quite have the same ring to it:

"bored it out to a 600!'

"isn't it already a 600?"

..."uh well stock its a 591 but uh...yeah pretty much"
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But then the fact I'm a poor student and still have to fix the transmission (god that's looking expernsive) makes me remember that for $46 less I can get a high comp Wiseco. Fuel availability is not really an issue then, I was more concerned that I'd be stuck using 98RON exclusively but if it runs fine on 95 then that makes me feel better.

At the moment I am leaning towards the Wiseco 11:1, 98mm.

Will update the thread if I decide differently. Thanks again for the discussion and info everyone.

John
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Old 03-20-2013, 06:44 PM   #7457
mcma111
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I have a used XR600 cylinder fitted with a 100mm Wiseco piston that looks damn near new sitting on the work bench.
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87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 03-21-2013, 01:38 AM   #7458
Captain115
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Quote:
Originally Posted by mcma111 View Post
I have a used XR600 cylinder fitted with a 100mm Wiseco piston that looks damn near new sitting on the work bench.
Really, that has definately piqued my interest. Sent a PM

EDIT:

Actually while I'm writing this I should double check what everyone thinks of the head journals.

]

This last two are of the centre journal, which doesn't have a bearings and is the most scuffed:


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Old 03-21-2013, 04:26 AM   #7459
mcma111
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Get some 600 grit wet and dry sand paper and smooth out the center journal. It's not that bad.
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BMW's
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87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 03-21-2013, 07:23 AM   #7460
elsalvadorklr
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Originally Posted by mcma111 View Post
I just checked E-Bay. There are Wossner 98mm 9.1 pistons available for $151.00. Same or less than Wiseco.

I recently installed a Wossner piston in a friends XR650l. The piston is very light and provides good power.
so I just re read benno h, thread, remeber the great guy who was shanked by his machinist for boring a cast piston tolerance on the beaituful wossner forged?

well according to hins measured weights

the oem CAST piston is the lightest at 415g without rings, however oem rings are known for being robust and he calculated them to be heavier than others and therefore the cast piston with rings was slightly heavier than the 99mm wossner.

alsio the 99m wossner is a different skirtless racing piston design much like a crf piston per say...

th 98mm was a full skirt or at least had side skirts and weighed MORE than the 99mm

BOTH PISTONS look beitiful and need 3thousands clearance, the 99 can use less at 25.

just thought this would be interesting for anybody who is doing the change

CAPTAIN? jejeje
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Old 03-21-2013, 07:43 AM   #7461
mcma111
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Christian,

I just drop the cylinder and what ever brand piston it may be, Wiseco, JE or Wossner on my machinist's counter and let him do his thing. I've never had a problem with Engine Dynamics work in the thirty years of doing business with Mike. http://www.enginedynamics.com/
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BMW's
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79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 03-21-2013, 07:51 AM   #7462
elsalvadorklr
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Quote:
Originally Posted by mcma111 View Post
Christian,

I just drop the cylinder and what ever brand piston it may be, Wiseco, JE or Wossner on my machinist's counter and let him do his thing. I've never had a problem with Engine Dynamics work in the thirty years of doing business with Mike. http://www.enginedynamics.com/
OH I KNOW

that place rocks!

just sayin that for those that dont have access to a great machinist or WORSE a damn stubborn one like benno or the one I had to deal with...

you need to clarify and have the piston specs on hand so no douche tells you otherwise!

jajajaja

peace
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Old 03-21-2013, 08:54 AM   #7463
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Quote:
Originally Posted by mcma111 View Post
Christian,

I just drop the cylinder and what ever brand piston it may be, Wiseco, JE or Wossner on my machinist's counter and let him do his thing. I've never had a problem with Engine Dynamics work in the thirty years of doing business with Mike. http://www.enginedynamics.com/
The JE I ordered came with all the details for boring, ring gap etc. neatly printed out in the box.
Only way the machinist can screw it up is by not reading it.

Is this true for all piston manufacturers ?
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Old 03-21-2013, 08:55 AM   #7464
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Originally Posted by elsalvadorklr View Post

you need to clarify and have the piston specs on hand so no douche tells you otherwise!
+1
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Old 03-21-2013, 10:25 AM   #7465
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All these broken xr motors popping up and im still sitting on my beast.
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Old 03-21-2013, 11:31 AM   #7466
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went for a little ride today, need to adjust the accelerator pump but other than that it seems pretty ok. New date for dyno is Tuesday next week.



Starting didnt give any issues.
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Old 03-21-2013, 11:40 AM   #7467
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Obviously the wheather in your part of the country is better than mine
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Old 03-21-2013, 11:49 AM   #7468
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Obviously the wheather in your part of the country is better than mine
had a bit of snow in the early afternoon. other than that it was pretty OK.

How's your piggy coming along?
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Old 03-21-2013, 12:06 PM   #7469
zipper2680
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HRC 11:1 100mm ..590g...

JE 101mm 10,8:1 .........530g....goooood!!! 641cc.....



20.000 kms later still pulls like a bull, no oil consumption and starts easily...

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Old 03-21-2013, 12:22 PM   #7470
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20.000 kms later still pulls like a bull, no oil consumption and starts easily...

That is a nice looking XR. I have never been a big fan of blacked out bikes, but you have a good eye for mixing in the colors at just the right combination. Well Done.

The muffler has to be the longest can I have ever seen on an exhaust...
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