stock raptor 660 hp? - Yamaha Raptor Forum
 

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Old 01-14-2011, 12:50 AM   #1 (permalink)
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Default stock raptor 660 hp?

I was wondering, how much hp (not kw) has a stock raptor 660? There are several suggestions that vary between 33 & 47. And can anyone calculate the hp of mine- 727 big bored (105mm piston, sport hotcam) jet kit carburetors, fmf power bomb exhaust generation, new cdi, k&n air filter, non covered air box?
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Old 01-14-2011, 02:01 AM   #2 (permalink)
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The only way to know for sure is to run it on a dyno, otherwise its just speculation.
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Old 01-14-2011, 06:37 AM   #3 (permalink)
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Quote:
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I was wondering, how much hp (not kw) has a stock raptor 660? There are several suggestions that vary between 33 & 47. And can anyone calculate the hp of mine- 727 big bored (105mm piston, sport hotcam) jet kit carburetors, fmf power bomb exhaust generation, new cdi, k&n air filter, non covered air box?
Stock 660...........32 to 34hp................
727...................??
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Old 01-14-2011, 10:14 AM   #4 (permalink)
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Stock 660...........32 to 34hp................
727...................??
Are you sure that 32 to 34 are hp, becouse I tought that is kw. It seems pretty low to me, knowing that the 400 models are about 40- 45 hp... I think it`s near 50 hp, but not sure. And my 727, about 60? I know about the dyno, but here its almost impossible to get it checked, we have only 3 dynos in my region and it`s not cheap.
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Old 01-14-2011, 10:24 AM   #5 (permalink)
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Around 33-35 rear wheel hp, as Willy said.
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Old 01-14-2011, 06:24 PM   #6 (permalink)
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Are you sure that 32 to 34 are hp, becouse I tought that is kw. It seems pretty low to me, knowing that the 400 models are about 40- 45 hp... I think it`s near 50 hp, but not sure. And my 727, about 60? I know about the dyno, but here its almost impossible to get it checked, we have only 3 dynos in my region and it`s not cheap.
I am very sure, like positive, and you cant šompare the 400 series engines with the 660 based engine, they dont compare...........
They are lighter, rev much higher and much faster then the 660......
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Old 01-14-2011, 09:25 PM   #7 (permalink)
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You`r right, but still 35 hp on stock 660 seems low to me. A hope my 727 is at least 50 hp now. And what about raptor 700?
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Old 01-14-2011, 09:34 PM   #8 (permalink)
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You`r right, but still 35 hp on stock 660 seems low to me. A hope my 727 is at least 50 hp now. And what about raptor 700?
It depends on how you build your 727, I am building one presently and am looking for some 70 hp.........
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Old 01-14-2011, 10:44 PM   #9 (permalink)
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Well, I can tell that the compression is around 13:1 and if I fully rev it while I'm on 1st and 2nd gear, I'll fall down. As far as I enter 3rd i can push the throttle till the end and still the front wheels are in the air, the same hight as your left wheel in your pic.
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Old 01-14-2011, 10:52 PM   #10 (permalink)
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The picture in my signature is of my Raptor in oval track racing, in that pic, it is coming out of the corner in 5th gear at 60mph................
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