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Big Bore Kits?

This is a discussion on Big Bore Kits? within the Yamaha YFM700R Raptor (2006-Present) forums, part of the Performance /Technical category; I think im ready to start messing with the engine, to get more power. I was looking around at DRracing kits, but i dont need ...


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Old 05-11-2009, 10:01 PM   #1
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Default Big Bore Kits?

I think im ready to start messing with the engine, to get more power. I was looking around at DRracing kits, but i dont need everything they have for those. I plan on slowly getting parts and starting the build in the fall/winter, stock bore is 102mm x 84mm

790cc BB kit $2150 @ maxpower-engines.com
779cc BB/stroker $????? @ faliconcranks.com
750cc BB Kit $629 @ KDSracing.com
741cc BB kit $750 @ ctracing.com
734cc BB kit $640 @ maxpower-engines.com
734cc BB Kit $875 @ tqsatv.com
727cc BB kit $525 @ kustom-kraft.com
727cc BB kit $680 @ maxpower-engines.com



Duncan Racing, and Alba Action Sports didn’t break down the cost of just a BB kit.
Barker doesn’t have their BB kits listed

What parts work for you guys?
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Old 05-15-2009, 01:11 PM   #2
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Old 05-15-2009, 07:58 PM   #3
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WWW.BARKERSEXHAUST.COM
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Old 05-24-2009, 12:14 AM   #4
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Theres lots of great options out there, no need to bore or stroke the hell out of the 700's. Theres plenty of 70+ HP stockbores. I would recommend a Cam, +3 TB, and dynatek ign. If you want to go crazy then add a piston and port and it will be rocking!!!
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Old 10-14-2009, 03:55 PM   #5
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Anyone know any others? Or better prices?
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2006 700, AC bumper, Proarmor Nerf/Skid plates, K&N Intake, LSR axle, Two Bros Slip on, PCIII, 22x12.5 ITPs, Trail tech Comp, more
04 Dodge 1500 Off Road Ed. 5.7
03 Suzuki SV 650

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Old 10-21-2009, 08:35 PM   #6
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Quote: Originally Posted by inSANDity View Post
Theres lots of great options out there, no need to bore or stroke the hell out of the 700's. Theres plenty of 70+ HP stockbores. I would recommend a Cam, +3 TB, and dynatek ign. If you want to go crazy then add a piston and port and it will be rocking!!!
What cam do you have? What else works for you?
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2006 700, AC bumper, Proarmor Nerf/Skid plates, K&N Intake, LSR axle, Two Bros Slip on, PCIII, 22x12.5 ITPs, Trail tech Comp, more
04 Dodge 1500 Off Road Ed. 5.7
03 Suzuki SV 650
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Old 10-29-2009, 12:30 PM   #7
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I had Rocket Factory do me a sweet stock bore build.. I wanted a reliable duner that could run the hill a few times then dune away.. Didnt go high compression because I wanted to run pump gas. Running a 14:1 piston scares me. I have been there done that with blown head gaskets and ruined dune trips on other more aggressivle built bikes... They would go like hell until they went boom then I was relegated to riding my wifes 3-mod 660 the rest of the week...

Stock bore 10.5:1 / ignition with custom RF mapping / P&P by RF / +2 TB / Barker Duals / K&N filter.. I have thsi build for almost 2 years now and havent had one problem with it. I have done 40 mile runs to mexico and back when in Glamis. It will dune all day and beat 95% of the bikes at whatever compy hill you pull up to. I have had to do nothingmore then change the oil and sadjust the valves..

Couldnt be happier with it. It revs fast, hits hard and keep pulling. I have a buddy who has a built 734 and I consistantly beat him even though I outweigh him by 100 lbs...

There is plenty you can do with a stock bore. Its cheaper and more reliable IMO. If my motor ever greandes and I need a clean up on teh cylinder, then I will go bigger bore but I aint messing with a good thing.. I think this was the dyno run before and after the +2 TB I did with Jason @ RF a while back for a write-up we did here at BT.

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