 |
02-07-2012, 09:07 PM
|
#1 (permalink)
|
|
Junior Member
Member #15972
Join Date: Feb 2012
 ( 0)
Posts: 5
|
Engine
I run an 08 trx450er on sand and do a lot of drag racing. I had a full hrc kit on and it would fly. Now i know its still low in the numbers as far as hp goes. But I just installed a JE 12.8-1 piston and a full rs-2 comp series Yosh. Should i save up money and buy a big bore later on or go with a port and polish and bigger vavles with a carb bore to boot. What kind of hp difference am i looking at between the two ideas?
|
|
|
|
02-07-2012, 10:18 PM
|
#2 (permalink)
|
|
Senior Member
Member #13858
Join Date: Oct 2011
Location: Ohio
( 0)
Posts: 111
|
Quote:
Originally Posted by tdanbb18
I run an 08 trx450er on sand and do a lot of drag racing. I had a full hrc kit on and it would fly. Now i know its still low in the numbers as far as hp goes. But I just installed a JE 12.8-1 piston and a full rs-2 comp series Yosh. Should i save up money and buy a big bore later on or go with a port and polish and bigger vavles with a carb bore to boot. What kind of hp difference am i looking at between the two ideas?
|
I can't quote exact HP numbers, but from a lot of experience with these engines, I would go with the port, polish, and bigger valves. The carb bore will give a nice increase in top end power too. The lower priced big bore kits are somewhat suspect, there have been reports of running hot. I build these motors for a few A class racers, and after a lengthy discussion with Mark Baldwin from Baldwin Motorsports, he said the same thing. If you're set on a big bore, save your money for an Ice Cube cylinder. Increased water jackets in the cylinder help keep temps at a managable level.
__________________
2011 CRA Senior II, Buckeye series, and True Grit series Harescramble Champion
2009 CRA Senior II, Buckeye series, True Grit, and Salem MC Harescramble Champ.
2007 CRA Senior II, Buckeye series, and True Grit series Harescramble Champ.
2007 TRX450R
2004 TRX450R
2003 Lonestar 250R
2001 Lonestar 250R.....now a 310
1986 TRX250R (restored to new)
1986 TRX250R (still in pieces)
1999 CR500
1999 CR250
1996 CR250
1986 ATC250R
1975 MR50
1999 Banshee
and many more.
|
|
|
|
|
02-07-2012, 10:47 PM
|
#3 (permalink)
|
|
Junior Member
Member #15972
Join Date: Feb 2012
( 0)
Posts: 5
|
Where can i learn more about an ice cube cylinder and is Sparks Racing big bore not a good idea?
|
|
|
|
|
02-08-2012, 11:20 AM
|
#4 (permalink)
|
|
Senior Member
Member #14099
Join Date: Nov 2011
Location: western ky
( 0)
Posts: 1,354
|
You will benefit more from the head work and carb work then you will from a big bore and later on if you do a big bore stroker kit then you will already have your carb and head done so it means even more power.
__________________
01 Rancher 350 manual shift 4x4
27" Kenda claws
P&P head
04 250ex Wife's ride
Removed the baffle and rewelded spark arrestor back in,Jetted,Uni-filter
04 YFZ450
Port and Polish,12.5:1,Dyno-jet kit,K&N air filter with custom intake tube,Cam mod,Pro circuit Ti4,GYTR nerf bars.
01 400ex
Port and Polish
Pro Circuit T4
Uni-filter
Dyno-jet 160 45 pilot 2 1/4 turns out
Custom foot pegs
With many things to come
It is a good trail quad with a lot of torque
|
|
|
|
02-08-2012, 11:33 AM
|
#5 (permalink)
|
|
Senior Member
Member #7607
Join Date: Dec 2010
( 0)
Posts: 3,930
|
i dont know if this applies to atv's. but with cars, if you step up a bit with heads and the intake, it will slightly increase your compression ratio. it should apply to atv's too.
|
|
|
|
|
02-08-2012, 10:41 PM
|
#6 (permalink)
|
|
Senior Member
Member #13858
Join Date: Oct 2011
Location: Ohio
( 0)
Posts: 111
|
Quote:
Originally Posted by tdanbb18
Where can i learn more about an ice cube cylinder and is Sparks Racing big bore not a good idea?
|
Not sure about the Sparks kit, but I'd bet it's a repackaged Cylinder Works or Athena.
Here's a link to the Ice Cube.
TRX488 ICE CUBE Big Bore '06 | TRX450R 06-Current | Honda | ATV / UTV Kits
__________________
2011 CRA Senior II, Buckeye series, and True Grit series Harescramble Champion
2009 CRA Senior II, Buckeye series, True Grit, and Salem MC Harescramble Champ.
2007 CRA Senior II, Buckeye series, and True Grit series Harescramble Champ.
2007 TRX450R
2004 TRX450R
2003 Lonestar 250R
2001 Lonestar 250R.....now a 310
1986 TRX250R (restored to new)
1986 TRX250R (still in pieces)
1999 CR500
1999 CR250
1996 CR250
1986 ATC250R
1975 MR50
1999 Banshee
and many more.
|
|
|
|
|
Lower Navigation
|
|
|
| Search tags for this page |
|
2007 trx450r motor for sale, atv engines motor 450r, big bore honda 450 sand drag, big bore kit trx450r difference, big bore kits 450 honda foreman, cr250 cylinder on trx250r hp difference, foreman 450 big bore kit, honda atv engines for sale, honda foreman 450 motor for sale with big bore kit, honda hrc kit, how to polish a trx 450 motor, how to port and polish a cylinder head on a honda 450r atv engine?, trx 450r baldwin port job hp, trx450r big bore, trx450r big bore horsepower, trx450r big bore kit hp, trx450r big bore kit vrs hrc kit, trx450r engine motor for sale, trx450r how big of a differance does port amd polish have, trx450r port and polish
Click on a term to search our sites for related topics.
|
| Thread Tools |
|
|
| Display Modes |
 Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
|
