Couple of stock bore-stock stroke 04/05 TRX450R's

[ghott]

Posted these results on a couple of forums - figure'd I would post them here too.

Dyno used was a Dynojet 168 dyno with 18" American Racer slicks with some sort of bead lock wheels.

Here's the setups and the graphs:

Dad's setup:
- Stock bore/stroke 2004
- DASA intake on stock 04/05 boot
- Racers Edge AZ 42.5mm FCR
- RBC Web 208/921 straight up
- 36/31 valves
- Wicked Motors head (decked)
- DASA LL 13:1 piston
- DASA Classic exhaust (uncut)
- Dynatek on Curve 3
- VP MRX02 fuel
- 14/36 gearing w/ +4" arm

Dad's graph:
http://www.garyhott.com/dad-hp.jpg

My setup:
- Stock bore/stroke 2005
- DASA intake on stock 04/05 boot
- Sredrum 43.5mm FCR
- FBC Web 242/921 straight up
- 36/31 valves
- Wicked Motors head (decked)
- DASA LL 13:1 piston
- DASA Classic exhaust (uncut)
- Dynatek on Curve 3
- VP MRX02 fuel
- 14/37 gearing w/ +4" arm

My graphs:

http://www.garyhott.com/me-hp.jpg

http://www.garyhott.com/me-tq.jpg

We may have made a tiny bit more power if I would have remembered to switch the Dyna to the stock curve with the 10,500 rev limit - our bikes have always made the best power with the stock timing curve but I had been playing with the ignitions forgot to switch it back. I also might have been able to squeeze a pinch more out of mine if I would have richened up the A/F mixture since oxy fuel likes to be on the richer side of things - my A/F curve tagged 14.5:1 at one point! - Not good. I'll be heading back to this dyno in a month or two for the intake testing - so I'll hopefully get to tweak it a little more.

I'll have a few more graphs including the A/F and some comparison graphs up on my site later this week (see sig).

I also have a bigger engine on the way for next year thanks to John at RE AZ - it makes a bit more power than these

[Burns310r]

Basically the cam is the only difference in your dads and yours motors?

[ghott]

Basically the cam is the only difference in your dads and yours motors?

There are a few differences - the cam being the first.

Dad's cam = RBC 208/921
My cam = FBC 242/921

Dad's carb = FCR 42.5mm straight bore
My carb = FCR 43.5mm taper bore

Dad's head porting = Wicked Motors, MD - ported in 2012 (kinda a "race" head)
My head porting = Wicked Motors, MD - ported in 2013 (more of a "pro" style head - little more expensive than Dad's and flows a little better)

Other than those 3 differences, the engine components are exactly the same from the air filter and fuel all the way to the exhaust silencer and everything in between.

[2001400exrida]

looks like some nice curves and power for SB/SS. For a drag build that's a nice curve. Looks like he hit peak around 9250 rpm. Your dads fall right off after that, where yours keeps some power all the way through 10500 rpm.