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Oversize piston kit for XT660R?
Hi
I have manage to cause some damage to my XT's motors sleeve and need to replace the pistons and rings. I would like to go a little bigger on the piston size. So far all I could find is the Raptor oversize kits from Wiseco and JEPistons. The 102mm overbore is what I would like to use on the standard XT motor. Has any of you done this before? Could anyone please advise me on a few small things I need to know before I start and just any help/info on doing this would be good Firsty the Piston Pin - 22 x 14 x 57.15mm SW that comes with the kit seems to be smaller than the one in the standard XT660R piston. Am I correct? This pin will not fit on the conrod? The one on my standard piston is 23mm and the kit says 22mm? Looking at this it will be a problem for fitting. The overbore is 2mm. Will taking off this aluminium cause the engine to overheat or not? Thanks |
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There are a few of us that have done a 102mm conversion. I am helping with a 105.5mm XTX conversion next weekend.
You can use any Raptor 700 piston, if you are using 98 or 95 RON fuels you can run a compression ratio up to 11.5:1. I would only use a CP piston as this piston has the longest piston skirt out of the JE & Wisco Raptor 700 pistons. My last JE 102mm piston kit only lasted 10000KMS (6K miles) & developed a rattle because of the short piston skirt. You can buy a corrected deck height 11.5:1 or normal 11:1 CP piston I would only use one of these. You can bore the standard XT660 cylinder to 103mm to make it a true 700cc, this has already been done read below. Have a read in the modification index you will find more info on big bores. http://www.xt660.com/showthread.php?t=630 http://www.xt660.com/forumdisplay.php?f=52 |
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I live in South Africa and we are a little limited to suppliers. I deal with a supplier that only get parts from Wiseco pistons. Can you maybe give me a part number of the piston kit and gasket that you would recommend I get. If you know of a USA company that will ship to South Africa I would then buy direct if possible. I had a look at the other pages/threads you posted and this looks wow? Raptor 660 Cast Cylinder Kit 727cc :icon_eek: . http://www.whiteknuckleracing.com/index1.html Will this work? Otherwise I will just go for the 102 overbore. http://www.wiseco.com/ProductSearch.aspx http://www.wiseco.com/ProductDetail....09&AppID=28659 I appreciate your time and input. Thank you. |
None of the Raptor 660 pistons fit the XT660, so look at the Raptor 700 pistons as they fit. Send Freez a PM he will know of a local CP piston supplier in SA.
USA Ebay CP 11:1 piston kit. http://cgi.ebay.com/Raptor-700-CP-piston-stock-bore-102mm-11-1-comp-NEW-/290548089746?pt=Motors_ATV_Parts_Accessories&hash= item43a6040392 http://cgi.ebay.com/ebaymotors/Raptor-Rhino-700-102mm-11-1-Std-Bore-CP-Piston-w-Gasket-/350365325365?pt=Motorcycles_Parts_Accessories&hash =item5193669835 If you are running a 102mm piston this is the one I would use. http://www.tqsatv.com/proddetail.php?prod=RAPTOR-700-TECH-PISTON http://i150.photobucket.com/albums/s...p/DSC01245.jpg |
Here is a picture of my XT660R. Not a pretty one! I am doing some mayor mods and repairs for more extreme terrain riding.
http://i401.photobucket.com/albums/pp95/RovRat/a2.jpg |
In that case go for one of these, you will need to machine the XT's casing to fit a 104mm & bigger cylinder.
http://shop.ebay.com/i.html?_nkw=raptor+700+cylinder&_frs=1&_trksid=p32 86.c0.m359 |
What you think of this one Kev?
http://cgi.ebay.com/ebaymotors/RAPTO...cessories#shId Will I need to get any more things to make this work besides machining the engine? Sorry for all the questions. It is my first time doing this kind of thing and there don't seem to be anyone around my area that has done this on a XT before. |
I am helping fit that exact kit to a XTX next weekend.
The only problem with 12.5:1 compression you can't run normal fuel you will need race fuel 100 RON or more. |
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