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Congrats on hitting your goal Matt!!!! You worked hard for that one. When is the "demo-day" for me to ride it?

Hey Matt, Is your new build ready? At the Dumont Drags, do we need whips or lights on the bikes? I assume not but don't want to get ticketed. What time does the racing start? end?

I have a Big Gun Rev box for a 2004 or 2005 TRX450R for $50 shipped. I have a K+N filter for the same bike for $35 shipped. K+N is a HA4504 which is a bolt on filter to replace your stock one with. . .

Thanks guys! I am having a blast on this thing. The worst part is getting back on my Honda and expecting the same acceleration when I dune. I am using "Powerdirector 9". It works really well and is pretty affordable. I don't think people realize how much time it takes to put together a good 20 minute vid. This one was only 2 mins and I spent hours on it. LOL I I think I am close on the gearing but another tooth on the rear might help. I am running a 44 tooth rear but Nano from D&M saw me at the hill and thought a 45 tooth would be perfect. My ign. timing was a little too high so that slowed me down a bit too. There is always "a little more in it", right?

I am still trying to fine tune this beast but here is where I am at so far.

That EZ UP doesn't look like it provides much shade.

I was lazy and just used 4 scales for less hassle.

That is a lot of parts but you are 44 lbs lighter than mine. Impressive. That must help out a bunch when racing. Why not go JJ+A axle? Lifetime warranty and top notch quality. How does that bike handle the whoops with the shaws?

Wow, that is light. What is done/lightened on your bike? My 05 450R came in at 358 lbs with no fuel. Post up a pic of your bike and what you lightened.

It is but I love it!!!! Check it out. It wasn't running the best in this video but we will shoot some more next trip and I should be at least in the mid 80's in speed.

Thanks yfz450~bence. It is a blast to ride. We run on an automotive dyno so the length of the dyno pull is about 6 to 8 seconds. That is what I meant by a longer run time. Atv dynoes only have a run time of about 3 seconds for these bikes due to much lighter rollers. This is a budget build. I only paid $275 for the porting and I think Venom did a great job! He promised me 10% across the board for a power increase and that is exactly what I got. I have dyno runs for this whole build. The dyno runs before and after porting were roughly 50 to 55. 5 HP gain for $275 bucks is a bargain. That is only $55 per HP gain. Where else can you get that? I think I could go with larger valves, more radical cam, and more aggressive porting to get the top end to not drop off. I think there is enough of a broad curve for me to utilize. This 501 makes so much power down low that it isn't really necessary to rev the snot out of the motor. LOL

Looks good Matt. Thanks for posting up. What gains do you usually see when going with bigger valves?

I think I am good for now. I am going to just enjoy this beast.

Thanks! The broad curve really makes it fun to dune and when draggin' the hill, the power output never really drops between shifts which I feel is a big advantage. Choppy curve: It just seems to be characteristic of this dyno. I have many runs from many different bikes and they are look this way. It could just be as simple as the dyno tires we are using. The run times are much longer on this dyno to simulate the hill which may be causing these spikes to show up. Nothing to be concerned with though.

http://www.offtopic.forum/uploads/imported/2012/05/trx450rstockcarbvsfcr44-1.png Here is my before and after with the stock 2005 carb jetted right compared to a YFZ FCR straight bored to a 44. I picked up 2 HP across the board as you can see which actually seems low. I also ran a max speed test up Olds to compare the 2 carbs in the same weekend. Max speed with the stock carb was 49mph and max speed with the 44 FCR was 52 mph!!! I thought that shows how big of a difference the carb can make. My 2 dyno runs were not done back to back. The fcr was put on a couple of months later when the motor had more time on it so that could be why the difference isn't greater. Motor: +3 hot rods crank unbalanced, CW BB kit, early hrc cam, venom porting, stock size valves in head, Rossier pipe, dyna box, Dasa intake + filter with stock snorkel and air box, 13:1 CP piston, pump gas, tps hooked up, etc. The carb gives the bike better throttle response in the dunes. When racing the hill, the bike pulls much harder throughout the rpm range. This stubborn s.o.b. finally hit 60HP with a very broad curve. I am lovin' this bike now.