Author Topic: can a 60 be bored to take a stock 65 piston (Read 16232 times)

jonny500 · « **on:** December 21, 2011, 06:03:38 AM »

i have a barrel from a kx 60 with a steel liner at 43mm stock bore, it needs a rebore but all the o/s piston are very costly in the u.k. how ever there are loads off cheap stock kx65 pistons 44.5mm (i think). any 1 now if the ring gaps are in the right place and the wrist pins the same size ect
thanks in advance

DoldGuy · « **Reply #1 on:** December 21, 2011, 06:48:05 AM »

http://www.lukesracing.com/luksr/kx60bb72.htm

jonny500 · « **Reply #2 on:** December 21, 2011, 07:52:03 AM »

thanks doldguy, i looked on that site and the part numbers for the 46mm 65 piston kit and the 46mm 60 kit are different so i think its a no go unless anyone knows different

81cr450 · « **Reply #3 on:** December 21, 2011, 03:30:45 PM »

Just a guess on my part but it might serve you. When swapping something like that I would check the stock rod length & stroke length of each. If they match & the pistons cheap enough it might be worth the gamble

jonny500 · « **Reply #4 on:** December 21, 2011, 09:50:21 PM »

the stroke and wrist pin is defo the same and so is the crank i think. its the ring gap i am stuck on now
thanks for your inptut guys

sandblaster · « **Reply #5 on:** December 22, 2011, 07:46:11 AM »

2000 KX60 has a stroke of 41.6mm.
2000 KX65 also has a stroke of 41.6mm.
According to the book, **KX60 crank 13031-1448** Fits
1999 KX60-B15 KX60 CRANKSHAFT-PISTON(S)
2000 KX60-B16 KX60 CRANKSHAFT-PISTON(S)
2001 KX60-B17 KX60 CRANKSHAFT-PISTON(S)
2002 KX60-B18 KX60 CRANKSHAFT-PISTON(S)
2003 KX60-B19 KX60 CRANKSHAFT-PISTON(S)
According to the book, **KX65 crank 13031-1467** Fits
2000 KX65-A1 KX65 CRANKSHAFT-PISTON(S)
2001 KX65-A2 KX65 CRANKSHAFT-PISTON(S)
2002 KX65-A3 KX65 CRANKSHAFT-PISTON(S)
2003 KX65-A4 KX65 CRANKSHAFT-PISTON(S)
2004 KX65-A5 KX65 CRANKSHAFT-PISTON(S)
2005 KX65-A6 KX65 CRANKSHAFT-PISTON(S)
Another option would be to buy a KX65 cylinder that needs a rebuild and get all the dimensions from it:
http://www.ebay.com/itm/Kawasaki-1990-KX-65-Cylinder-E-369-/170720073429?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item27bfb596d5
Off the guy 50 bucks for it.
If you get it, you can always resell it when your done (Assuming that it does not work out)
There must be a forum that specializes in these smaller bikes:
Just a quick Google search netted the following:
http://www.justanswer.com/motorcycle/5g9e1-will-kx65-fit-kx60-bike.html
http://bikez.com/msgboard/msg.php?id=19826&type=bike
http://forums.dirtrider.com/70/6525841/kawasaki-dirt-bikes/kx60-top-end-job/index.html

DoldGuy · « **Reply #6 on:** December 22, 2011, 01:38:21 PM »

John,
The KX60 & KX65 have the same Wrist Pin, the same Rings per size. The difference in the pistons is the KX60 has a 24mm compression height & the KX65 is 23.6 mm. If memory serves......

......the ring pin location is the same. The head needs to be brought down to correct the squish clearance & adds some port timing

Hope this helps,
DoldGuy

jonny500 · « **Reply #7 on:** December 22, 2011, 06:18:30 PM »

Quote from: DoldGuy on December 22, 2011, 01:38:21 PM

John,
The KX60 & KX65 have the same Wrist Pin, the same Rings per size. The difference in the pistons is the KX60 has a 24mm compression height & the KX65 is 23.6 mm. If memory serves...... ......the ring pin location is the same. The head needs to be brought down to correct the squish clearance & adds some port timing

Hope this helps,
DoldGuy

gold dust, thats what i was after. thanks to all of you for your efforts on this. so i will buy the 65 piston and see how it goes if what doldguy is correct then is just a re-bore + a thiner head gasket. i will make sure the result of this is posted for future reference

funke93 · « **Reply #8 on:** November 13, 2012, 05:01:33 AM »

so what happened can you do it?

jonny500 · « **Reply #9 on:** November 13, 2012, 09:08:08 AM »

yes it did work and bike ran fine. the main problem is the head gasket. the bore hole needs to be widen a little and then it all works fine. i used an after market gasket kit with a fibre head gasket. in hind site i would have purchased an all metal kawasaki head gasket as it would be easier to modify. the stock kx 65 gasket will not fit

DoldGuy · « **Reply #10 on:** November 13, 2012, 09:16:06 AM »

Johnny,
How did the sqiush clearance work out? Also hope it runs better up top now with the difference in timing.

DoldGuy

jonny500 · « **Reply #11 on:** November 13, 2012, 11:08:18 PM »

i sold the bike shortly after, but it ran ok. i am 17.5 stone (lol) so i couldnt really tell how it performed but yes seemed ok

sandblaster · « **Reply #12 on:** November 14, 2012, 03:00:39 AM »

1 Stone = 14 Pounds sooooo 245lb

DoldGuy · « **Reply #13 on:** November 14, 2012, 03:41:00 AM »

Quote from: sandblaster on November 14, 2012, 03:00:39 AM

1 Stone = 14 Pounds sooooo 245lb

Skinny

jonny500 · « **Reply #14 on:** November 14, 2012, 05:06:04 AM »

some say im fat but i call it good living