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Discussion Starter · #1 · (Edited)
Hit the OCP dyno again this weekend:

2009 YFZ450R
Athena Big Bore Cylinder
Venom 98mm 12.25:1 Piston
Venom HVP porting with +1 DelWest TI Valves
MMAD Warpspeed Intake cam stock exhaust cam
44mm Throttle Body
Fuel Customs Intake without box
Barkers Exhaust
Vortex ECU MAP#9 low 5, Mid 8, High 4

Blue Line = new build
54.85HP 35.06TQ

Red line was old build: 51.95HP 33.65 TQ
FCI
Barkers
06 intake cam
Venom stock valve HVP porting
44mm TB
MSD
Stock bore CP 12.75:1 Piston



Bike definitely runs good, always hoping to see a little more power at the dyno, but these YFZR's are hard to get lots of power out of. Once this piston is worn out i think i will do a high compression 14:1 piston with a bigger cam, hopefully i can get a few more HP and a bit more TQ out of it.
 

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Wow great numbers! Glad you put that warp speed cam too good use!
 

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Discussion Starter · #9 ·
When we were at the Dyno we had a chance to compare the Vortex VS the MSD on my buddies bike. The Vortex made the same HP as a properly tuned MSD with the timing advanced. So save your $$ unless you really like the clean install of the Vortex, i always hated the way the MSD was in the way of the filter and eventually my space age velcro wore out.
 

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When we were at the Dyno we had a chance to compare the Vortex VS the MSD on my buddies bike. The Vortex made the same HP as a properly tuned MSD with the timing advanced. So save your $$ unless you really like the clean install of the Vortex, i always hated the way the MSD was in the way of the filter and eventually my space age velcro wore out.
I never put the msd where they said to. I saw a power difference believe or not.
 

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Discussion Starter · #11 ·
I never put the msd where they said to. I saw a power difference believe or not.
You made more power with the MSD? Your YFZR was a full tilt build with that MMAD 121 head on MR12, I doubt those pre loaded Vortex maps would do as good a job as a custom MSD map. Did you ever get a chance to use the Vortex software?
 

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Really nice curve you´ve made.
I have also just made a build with the Athena big bore cylinder, but with Hotcams stage 3 intake cam. After testing it on track, I think the engine got a little too hot, so I ordered the Hotcams stage 3 exhaust cam to. Now the engine is operating at an acceptable temperature, so problem solved.
I would recommend you to think about another exhaust cam, if you are using your machine for track racing...:)
 
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