Polaris Pro Riders
Sign up Calendar Latest Topics
 
 
 


Reply
  Author   Comment  
Brandon13buckley

Registered:
Posts: 117
Reply with quote  #1 
Ok my buddy just picked up a sweet yfz that has apparently been bored out to 535 i wanna know how my 560cc pred will hold up against this thing and if not what mods should i look at in order to get them similar
LEOGM5150

Avatar / Picture

SITE OWNER
Registered:
Posts: 15,429
Reply with quote  #2 
a well equipped much lighter yfz will be a tough chase for a long time. every yfz with good mods i lined up against on my well modded 558 predator left me a long ways behind. after a big bore pipe filter and jetting on the predator the hp start to get really expensive. the hp per $ on the yfz are much more plentiful. a big bore yfz with a cam mod will make some good hp. i would just race it and if you are close be happy. if you must beat him save up a large chunk of cash and start with huge cams all new aftermarket valve train and get ready to pay real good head guy to go through the predator head, like daryl from hpd.
__________________
FROM: POWELL WYOMING USA

MY GREATEST FEAR IS THAT WHEN I DIE MY WIFE WILL SELL MY TOYS FOR WHAT I TOLD HER I HAVE INTO THEM...

2014 POLARIS RZR 4 900 EPS
2012 POLARIS RZR 4 900 XP
2008 POLARIS RZR 800
2008 POLARIS OUTLAW 525S LE
2007 POLARIS OUTLAW 525 IRS
2000 400 RCR TWO STROKE SCRAMBLER
2001 400 TWO STROKE SCRAMBLER
2005 SKI DOO 1000 TWO STROKE SAND SLED
Brandon13buckley

Registered:
Posts: 117
Reply with quote  #3 
My quad only has a 12:5:1 compression piston would going to a higher ratio piston add mich hp for extra $in gas?
LEOGM5150

Avatar / Picture

SITE OWNER
Registered:
Posts: 15,429
Reply with quote  #4 
no just upping the compression will not add hp. if you up the comp along with the flow like a stroker, higher lift and longer duration cams and lighter weight piston and lighter rotating mass like lightened flywheel ect ect then higher comp may add some significant hp but just upping the comp from 12.5:1 to 13.5:1 will likely just cost you double in fuel cost when you now need to run race fuel, but will add very little actual hp.
__________________
FROM: POWELL WYOMING USA

MY GREATEST FEAR IS THAT WHEN I DIE MY WIFE WILL SELL MY TOYS FOR WHAT I TOLD HER I HAVE INTO THEM...

2014 POLARIS RZR 4 900 EPS
2012 POLARIS RZR 4 900 XP
2008 POLARIS RZR 800
2008 POLARIS OUTLAW 525S LE
2007 POLARIS OUTLAW 525 IRS
2000 400 RCR TWO STROKE SCRAMBLER
2001 400 TWO STROKE SCRAMBLER
2005 SKI DOO 1000 TWO STROKE SAND SLED
Dunph

Avatar / Picture

Moderator
Registered:
Posts: 2,277
Reply with quote  #5 
yea leo is right but his bbk yfz wont last long so just keep popping his tires til his motor blows
__________________
06 Outlaw 558
15 sportsman 850 sp
02 scrammy 400
2016 2500hd
2003 GMC Sierra 1500hd Quadrasteer Yes i know my rear wheels are crooked! http://www.youtube.com/user/dustinwpearce
Commi-chusetts
Kmack

Avatar / Picture

Moderator
Registered:
Posts: 3,312
Reply with quote  #6 
Quote:
Originally Posted by Dunph
yea leo is right but his bbk yfz wont last long so just keep popping his tires til his motor blows

+1 0n that. Those YFZ engines just don't seem to hold up from what I've seen.

__________________
From: Artesia, New Mexico

BE POSITIVE - Because, if you think you CAN or if you think you CAN'T, you are right!

2009 Outlaw 525 S
2008 KTM 525
2004 KTM 525 EXC Dual Purpose Bike
1998 Yamaha 600 Grizzly - Elk Hauler
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.