I think my Flattie is a Cool Bore, Cool!

trepanned23

trepanned23

New Member
#1
#1
So, the standard bore rebuild kit will not work, right? I need chromed piston and rings? APS Karting has many sizes of the Raptor 3 for aluminum cylinder chromed pistons and rings for 43.00 ea. Good deal?

Just wanted to confirm that standard bore rebuild kits will not work in a Cool Bore. My engine model # is 130202 0365-02 coming from eBay in a day or two. I will check it out before buying anything and make sure that there is no iron sleeve in there. I am not going to run this motor too hard and a lot of guys run race karts with no iron sleeve so I figure I should be ok

Thanks for any input

George
 
milo raptors

milo raptors

New Member
#2
#2
ok general rule of thumb if it has a bearing on the crank its sleeved now you dont have to get over bore sizes it depends on the bore conditi when you get it that deal on the rap 3 piston sounds good but thema are the heavyest of the raptor pistons with you always use crome or it tears the bore up
 
trepanned23

trepanned23

New Member
#3
#3
Guys over on the 4cycle forum say that it's not a good idea to bore aluminum cylinders more than .020 - .030 because you start getting into the softer, unseasoned aluminum base material. There is the XLS chromed piston which is half the weight of the Raptor 3 Super Stock piston and then you need the long rod for that one.

Well, thanks Milo . . . good stuff to think about.
 
milo raptors

milo raptors

New Member
#4
#4
prsonaly the 20 to 15 range is prolly best to stay in ive bored one out 15 had a 4.50 h beam rod and a 500 compression height wiscoe just find the lenth of rod you need arc an horstman prolly got it an order it
 
badtec

badtec

Banned
#5
#5
trepanned23 said:
APS Karting has many sizes of the Raptor 3 for aluminum cylinder chromed pistons and rings for 43.00 ea. Good deal? George
Click to expand...
That sounds like a helluva good deal. Buy as many as you can afford....maybe you can get a break on 'em. One of the top, if not thee top, engine builder(s) in the country, told me that the chromed pistons that I have are like gold, and to hang onto them. I've heard that they can sell for anywhere up to $80 each. Are you positive that they're chromed? Scott.
 
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