Any one big bore a 700 fi ?? - Yamaha Rhino Forums - Yamaha UTV Forum
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post #1 of 9 (permalink) Old 01-15-2009, 10:18 PM Thread Starter
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Any one big bore a 700 fi ??

I have looked at a few web sites like trinity racing , etc . Just wondering if anyone favered one place more than another?
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post #2 of 9 (permalink) Old 01-15-2009, 10:24 PM
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I haven't heard of too many success stories on the 700 yet



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post #3 of 9 (permalink) Old 01-15-2009, 11:06 PM
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Originally Posted by wally View Post
I have looked at a few web sites like trinity racing , etc . Just wondering if anyone favered one place more than another?
Stay away from Trinty,if it's anything like the quads they build forget it.
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post #4 of 9 (permalink) Old 01-16-2009, 06:52 AM
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white knuckle racing
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post #5 of 9 (permalink) Old 01-30-2009, 08:42 PM
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The Trinity cylinders are a new casting that look pretty good, I don't know if it is the same as the White Knuckle or not. If you do not need to replace your cylinder, or if you are looking for the biggest bang for your buck, I wouldn't really spend the money on a big bore kit. The prep work to make Cometic gaskets (the only thing available) seal is miserable. A stroker kit is FAR superior at making power gains on the 700. The big bore can be worth a horse or so in a couple of places in the RPM range, but a stroker kit makes power everywhere. The factory head gasket is a work of art and the most desirable for the stock bore. Beware of high torque studs, they will pull the bore out of round, and you can leave power on the table with lost ring seal.
The XT660 Super Motard and the Aprilia 650 Pegaso have the same engine as the 700 with a smaller bore, and the same 9mm Yamaha factory head bolts easily go to 36 ft-lbs in those engines because there is more meat in the bore(100mm).
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post #6 of 9 (permalink) Old 01-31-2009, 09:53 AM
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call john at the pro shop in stanton (714)892-1300
He will build you a powerfull motor but will be reliable also.

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post #7 of 9 (permalink) Old 02-01-2009, 12:30 PM
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My buddy has a big-bore kit on his Raptor 700.

My Raptor 700 has the same mods minus the big-bore...his is a monster compared to mine. Way more power everywhere.

I'd suggest calling John at The Pro Shop also

'07 Rhino 660 * Mason LT * Elka Elites * Ron Woods exhaust * 38.2 hp on the Pro Shop's Dyno * LiveWire Whip
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post #8 of 9 (permalink) Old 02-01-2009, 05:03 PM
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Originally Posted by pronstar View Post
My buddy has a big-bore kit on his Raptor 700.

My Raptor 700 has the same mods minus the big-bore...his is a monster compared to mine. Way more power everywhere.

I'd suggest calling John at The Pro Shop also
Aren't you the same guy on the Raptor forums that has the big 3? What is your Raptor setup?

Maybe I should clarify the position by saying if both engines have the same compression, the stock bore will have similar power while being more reliable. The bigger bore starts to shine when you install bigger valves to take advantage of the reduced shrouding.

Last edited by Kenny; 02-01-2009 at 05:17 PM. Reason: incomplete thought
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post #9 of 9 (permalink) Old 02-01-2009, 11:26 PM
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Originally Posted by Kenny View Post
Aren't you the same guy on the Raptor forums that has the big 3? What is your Raptor setup?

Maybe I should clarify the position by saying if both engines have the same compression, the stock bore will have similar power while being more reliable. The bigger bore starts to shine when you install bigger valves to take advantage of the reduced shrouding.
Yup...for the motor I've got a PC3 with a Rocket Factory tune (verified correct on The Pro Shop dyno), Barker's duals, and Pro Design intake with a K&N. Also have some other mods...


ssduane on the Raptor sites is my buddy, he's got a 12.5:1 piston and a big-bore kit.

Compared to my quad, his is a lot faster.
While the motors aren't identical to Rhinos, more displacement will always give more power, all else being equal...it's just a matter of "how much more" versus the amount of $$$ you throw at it.

'07 Rhino 660 * Mason LT * Elka Elites * Ron Woods exhaust * 38.2 hp on the Pro Shop's Dyno * LiveWire Whip
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