how much hp on my 660? - Yamaha Raptor Forum
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post #1 of 11 (permalink) Old 10-28-2008, 08:51 PM Thread Starter
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how much hp on my 660?

i have a K&N air filter and a pro X 686 big bore kit...9.2/1 comprestion
just had the top end rebuilt...

sold the rappy
bought a yfz
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post #2 of 11 (permalink) Old 10-28-2008, 09:30 PM
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w/o modifications to the stock exhaust or an aftermarket unit you're probably floating somewhere around 40hp assuming the airbox is an open top, if not you may not be at 40. The big bore didn't yield you much with the stock compression.

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post #3 of 11 (permalink) Old 10-28-2008, 09:54 PM Thread Starter
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well i have the spark arestor out of it...the guy befor me took it out
well, i think i had lest then average hp because when i had it rebuilt (+ the bore)
i had a HUGE jump in hp

sold the rappy
bought a yfz
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post #4 of 11 (permalink) Old 10-31-2008, 07:20 PM
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i have a K&N air filter and a pro X 686 big bore kit...9.2/1 comprestion
just had the top end rebuilt...


You will have 39.35 hp


686 three plugger with HV porting, 39 FCRS, Curtis Sparks exhaust, Dyna FS CDI
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post #5 of 11 (permalink) Old 10-31-2008, 08:26 PM
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You will have 39.35 hp
hey Willy, just curious how you got that? is there a formula or so?

thanks

...RpTr...

Monster Born! Muahahah!

2004 Raptor "660"
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post #6 of 11 (permalink) Old 10-31-2008, 09:44 PM
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You will have 39.35 hp
I dunno how you figured that. I came up with 47.16hp...

07 700 SE

03 660 Bone stock... Honest!

03/04 660 built from parts.
It's stock too of course...

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post #7 of 11 (permalink) Old 10-31-2008, 09:56 PM
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I dunno how you figured that. I came up with 47.16hp...


Well, 47.16 hp is a tad high, I get 39.35 hp, that is with my INNOVAGE calculator.
Now mind you it has a very high degree of accuracy


686 three plugger with HV porting, 39 FCRS, Curtis Sparks exhaust, Dyna FS CDI
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post #8 of 11 (permalink) Old 10-31-2008, 09:58 PM
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hey Willy, just curious how you got that? is there a formula or so?

thanks

That my son, is a very good question, someday I will tell you, but for now I shall keep this formulae to myself..........


686 three plugger with HV porting, 39 FCRS, Curtis Sparks exhaust, Dyna FS CDI
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post #9 of 11 (permalink) Old 11-01-2008, 09:01 AM
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There's no Horsepower formula crazies!!! ahahaha.... In all honesty you probably only gained 1-2 off that piston upgrade, its stock compression ...

2003 Yamaha Raptor 660:
Yoshimura TRS Carbon/Ti
Pro-Design ProFlow
Dynojet Stage 2
Barnett Carbon Clutch
I.M.S. Heel Guards
ROLL Design Foot Pegs
AC Nerfs & Wide Grab-Bar
G-Force Axle +2
Powermadd Handguards
Dr.D Reverse Lever
'06 YFZ Front Shocks
ProTaper Mid's
PRM Full Skids
Lonestar Stainless Tie-Rods
L & A One-Way
IMS Desert Tank
C.E.C. Bumper
QuadTech Carbon Hood
HiPer CF1's
19" ITP MXR6's
21" Kenda Klaws
D.I.D. X-Ring Chain
12/39
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post #10 of 11 (permalink) Old 11-01-2008, 10:56 AM
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That my son, is a very good question, someday I will tell you, but for now I shall keep this formulae to myself..........
hahaha yes sir!

...RpTr...

Monster Born! Muahahah!

2004 Raptor "660"
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