how much hp on my 660? - Yamaha Raptor Forum

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Old 10-28-2008, 08:51 PM   #1 (permalink)
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Default 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...
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Old 10-28-2008, 09:30 PM   #2 (permalink)
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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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Old 10-28-2008, 09:54 PM   #3 (permalink)
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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
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Old 10-31-2008, 07:20 PM   #4 (permalink)
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Quote:
Originally Posted by Evan B. View Post
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
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Old 10-31-2008, 08:26 PM   #5 (permalink)
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Quote:
Originally Posted by willykiller View Post
You will have 39.35 hp
hey Willy, just curious how you got that? is there a formula or so?

thanks
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Old 10-31-2008, 09:44 PM   #6 (permalink)
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Quote:
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You will have 39.35 hp
I dunno how you figured that. I came up with 47.16hp...
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Old 10-31-2008, 09:56 PM   #7 (permalink)
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Quote:
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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
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Old 10-31-2008, 09:58 PM   #8 (permalink)
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Quote:
Originally Posted by joequad16 View Post
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..........
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Old 11-01-2008, 09:01 AM   #9 (permalink)
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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 ...
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Old 11-01-2008, 10:56 AM   #10 (permalink)
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Quote:
Originally Posted by willykiller View Post
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!
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