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Old 11-13-2012, 05:04 PM   #16
Wattner
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Old 11-14-2012, 11:10 AM   #17
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Originally Posted by sh0rtlife View Post
589 lol...i was soooo close

ok soo in my hunt for the right slug....if i do have to go up in compression what piston do i need?....soo bloody confused its annoying me

im guessing as i dont have my book in front of me...stock is 97mm so i need a 97.5 or a 98...can the stock sleeve handle 98?

98mm in no big deal at all! I bore XR600s to 100mm (628cc) all the time. Some people will even go to 101-2mm but unless it's a total effort race engine 100mm is as big as I like to go (on the stock sleeve).
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Old 11-14-2012, 01:18 PM   #18
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Stock XL600 bore is 100 mm. They have a short 75 mm stroke.
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Old 11-14-2012, 05:18 PM   #19
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Oops, I think he's right.
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Old 11-16-2012, 09:58 AM   #20
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ok that makes no sense ....no way the stock bore is 100mm..everything ive found says its 97mm...or is that part of the change from 83 to 85?
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Old 11-16-2012, 12:46 PM   #21
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You either need to put the pipe down or put some glasses on. The XL600r uses a 100mm piston. The XR600r uses a 97mm piston. The XR650l uses a 100 piston. Have you even measured the cylinder??

http://www.wiseco.com/ProductSearch.aspx
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mcma111 screwed with this post 11-16-2012 at 05:17 PM
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Old 11-16-2012, 03:52 PM   #22
RubberSideUp
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Do you have an XR engine, possibly, or an XL bottom end with an XR (97mm) cylinder?
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Old 11-20-2012, 09:49 PM   #23
sh0rtlife OP
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ok..ive verifyed it is a 99.5mm piston that was in there..or was..the bore now is a 100mm

odd my manual states it should be a 97mm bore....ahh well this makes things simple now LOL

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Old 11-21-2012, 02:56 AM   #24
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Go with the big bore kit. I eat up XRLs all day. not sure of the size i got, the receipt the PO gave me is unclear on the size, just says "Wiseco hi-comp." All I know is it likes 91 octane and when I roll back on the throttle, it is pure exhilaration for a single lung bike.
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Old 11-21-2012, 02:59 AM   #25
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Go with the big bore kit. I eat up XRLs all day. not sure of the size i got, the receipt the PO gave me is unclear on the size, just says "Wiseco hi-comp." All I know is when I roll back on the throttle, it is pure exhilaration for a single lung bike. on the street the front end just rises right up and im running the stock gearing
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Old 11-21-2012, 11:02 AM   #26
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i allready had a problem keeping the front down on the street and the rear under me off road....

anyone else find it weird that the slug i removed was 99.5mm...my brain just cant wrap around that if the stock xl bore is 100mm how did it have a 99.5 in it
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Old 11-21-2012, 11:54 AM   #27
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How old is the picton, Miles?? Most likely the piston is a 100mm but has shrunk from wear. They do that ya know. The wear out bit.
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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 11-21-2012, 01:56 PM   #28
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but that doesnt explain the bore cleaned and ready to roll for the next slug comming out at 100mm
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Old 11-21-2012, 03:43 PM   #29
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Sure it does. What's harder? The steel cylinder sleeve or the alloy piston? Who measured the piston and cylinder? You or a machinist?
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BMW's
58 R26
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 11-21-2012, 03:47 PM   #30
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I have a mid 80's XR600 cylinder that has a 100mm Wiseco piston in it. This is used but in very good condition. Just give the cylinder a ball bone and order a new set of rings. I have the hone. You'll be set. Yours for $100.00 + shipping.
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BMW's
58 R26
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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