Rebore necessary?

torszula · 12-20-2011, 06:51 PM

I have a set of Wiseco Pistions for a VMAX4 800. they are SK1175 and are .020 over.

VMAX 800 WITH 18MM WRIST PINS 789CC 65MM STOCK BORE
SK1173 = 789CC= 65MM STOCK BORE
SK1174 = 795CC= 65.25MM .010 OVER
SK1175 = 802CC= 65.5MM .020 OVER

My question is this:

can I use my stock cylanders or do i need to bore them out with these pistions? I've heard that since the cylanders are nicasal plated that they may not need to be bored out.

twincam88 · 12-21-2011, 08:43 AM

if the piston is oversized then yes you will need to bore but you will loose the nickasil plating. you might be able to bore and get the cyl. replated but if the cyl. are good go get some stock sized pistons.

12-20-2011, 06:51 PM	#1 (permalink)
torszula Super Advanced Member Join Date: Apr 2011 Posts: 164	Rebore necessary? I have a set of Wiseco Pistions for a VMAX4 800. they are SK1175 and are .020 over. VMAX 800 WITH 18MM WRIST PINS 789CC 65MM STOCK BORE SK1173 = 789CC= 65MM STOCK BORE SK1174 = 795CC= 65.25MM .010 OVER SK1175 = 802CC= 65.5MM .020 OVER My question is this: can I use my stock cylanders or do i need to bore them out with these pistions? I've heard that since the cylanders are nicasal plated that they may not need to be bored out.

12-21-2011, 08:43 AM	#2 (permalink)
twincam88 Super Advanced Member Join Date: Dec 2008 Posts: 605 Current Sled(s): 2010 nytro mtx Previous Sled(s): 99 sx700 Location: yorkton sk Favorite Riding Area: revy Age: 33 Riding Since: 5	if the piston is oversized then yes you will need to bore but you will loose the nickasil plating. you might be able to bore and get the cyl. replated but if the cyl. are good go get some stock sized pistons. __________________ wide open till you see god then brake hesitation means devastation

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