2005 Honda TRX450R "Little Bike" 450cc Dyno Graphs

November 19, 2006

First time on the dyno - shows a nice comparison between the HMF Sport Series and DASA full exhausts on a mildly modified 2005 Honda TRX450R. The clutch was slipping during these runs so I scheduled another dyno session for December of 2006 (below).

Bike Specs:

Dyno Info:

Best Run(s):

Graphs & Pictures

December 10, 2006

Dyno comparison between a worn clutch and a brand new clutch/springs on a mildly modified 2005 Honda TRX450R. There are also some graphs comparing a main jet change and a bonus graph with the numbers from a completely stock 04/05 TRX450R. Check out the short video for this dyno session too.

Bike Specs:

Dyno Info:

Best Run(s):

Graphs & Pictures

January 12, 2008

The Little Bike's third trip to the dyno was in January of 2008 after a few mods. The bike pulled very strong down low and made good low end torque, however; there was a very pronounced dip at the upper end of the RPM range. Jetting would not cure the dip. After a lot of testing/troubleshooting, a piece of plastic from the timing chain tensioner was found lodged in the relief valve holding it open causing the oil to bypass the oil cooler and dump it directly back into the crank case. This caused the major loss in power in the top end. You can read more about the crank case pressue issue here. See the August 2008 dyno graphs (directly below) for the results of the fix. Check out the short video for this dyno session too.

Bike Specs:

Dyno Info:

Best Run(s):

Graphs & Pictures

August 24, 2008

After the disappointing dyno runs in January 2008, and then finding the cause of the problem in summer of 2008, we went to a "stingy" dyno in Washington, PA at Steel City Harley Davidson. Six different ATVs were dyno'd the same day and graphs for all of them are provided below This dyno read ~13-14% lower than the dynos used in the previous sessions. I included "corrected" HP/TQ numbers for what the bike would have made on a normal Dynojet 168. Since a stock '06/'07 TRX450R makes ~39 hp/29 tq on Dynojet 168, and the stock '07 TRX450R made ~34 hp/24 tq on this Dynojet 250ix; I used a conservative 10% difference for calculating the correction. To see how the corrected numbers were calculated, click here.

Little Bike's Specs:

Sr's Bike Specs:

Dyno Info:

Best Run(s):

Graphs & Pictures

July 28, 2012

This dyno session shows a nice comparison between the Little Bike, now equipped with a 43.5mm FCR, and Sr's latest stock bore/stroke pump gas build. Horsepower and torque numbers weren't huge since it was over 95* F outside at the time of pulls.

Little Bike's Specs:

Sr's Bike Specs:

Dyno Info:

Best Run(s):

Graphs & Pictures

September 8, 2013

This dyno session shows a nice comparison between the latest engine build on the Little Bike, and Sr's updated stock bore/stroke race gas build. We may have been able to squeeze a little more power out of them if we would have had time to do some tuning since neither A/F curve looked very flat or ideal.

Little Bike's Specs:

Sr's Bike Specs:

Dyno Info:

Best Run(s):

Graphs & Pictures

October 5, 2013

This dyno session was a very short one due to electrical and spark plug issues. We were never able to get a full pull out of the bike, it would spit and sputter and hit a false rev limiter 700 - 1500 RPM before the programmed rev limit. I later found out this was due to both a bad stator and faulty spark plug.

Bike Specs:

Dyno Info:

Best Run(s):

Graphs & Pictures

September 1, 2015

In late 2015, I found a crack in the Little Bike's "Wicked" ported head and decided to send the entire motor, along with a brand new OEM head out to Racers Edge AZ. They ported the new head, swapped the valve train over, and assembled the top end with a much safer deck height than before. They installed the little bike's engine in their dyno chassis and tested four different intakes for a nice comparison.

Bike Specs:

Dyno Info:

Best Run(s):

Graphs & Pictures

May 22, 2016

Nice comparison between the Little Bike on our local-ish Dynojet 168 vs. a mostly stock (full exhaust plus airbox lid off) '07 TRX450ER.

Little Bike's Specs:

'07 TRX450ER Specs:

Dyno Info:

Best Run(s):

Graphs & Pictures