He told me he never tunes a dirt bike with knobbies as the results aren’t always accurate.
#Thumper racing license#
Hello – license plate and turn signals might suggest that it is, but hey, I do get knit-picky sometimes. As stated, he asked if my bike was street legal. The call ends with the promise that they’ll get to it that afternoon or the next morning, and with me thinking, do we not know about service documents or scheduling appointments?At this point, let me explain some of the conversation I had with the ‘tech’ about tuning my bike. Six business days later I call and, “Oh, we stuck your bike in the back and out of sight is out of mind”. Can I bring my bike in for a tune? “Well sure, just bring her on down and we’ll get to it as quickly as possible.” Worst case scenario, I’m told, is a week, but “that ain’t gonna happen”. One significant reason for dyno-tuning at this point in the modification process was to see just how close I could get to other WR’s with an aftermarket (see: expensive) exhaust system.My story begins with a call to the shop that has a dynamometer.
#Thumper racing mods#
If you chose to read any further, grab a cup of coffee and a hanky or two, and be prepared to find either a comedy of errors or a tragedy of incompetence.I’ll start with a quick recap of the mods done to my WR250R: Power Commander III USB (with PC IV software cut and pasted into it), opened the air box, pulled the EXUP system and installed the 12 O’clock Labs replacement module, gut the stock exhaust including catalytic converter, and opened the exhaust tip to 1 1/8th inches. Or in this case, and old man and his dual sport. Sooo, from here I’ll go into that, but I’ll warn you now, it’s a long sad story about a boy and his dog. Would I recommend that anyone else with an EFI controller and/or any other mods done, dyno-tune their bike? YES, without hesitation. The increase in power and fuel mileage makes me strongly believe that my bike is running at its peak performance, which should only add to its reliability and longevity. Power is up noticeably, and fuel mileage went from as low as 36 MPG to between 45 & 50 MPG, depending on how I ride it. Ah, but wait, there’s more incompetence to come!!!But before I go there, the bottom line is that I am extremely pleased with the end result, regardless of the dyno numbers. Then he asked me if it was “a street legal bike”, and all assumptions about his expertise on my bike when right out the window. Based on this and some other comments he made about the WR, I assumed he was some sort of an expert on the bike. (Editor’s note: There’s a longstanding debate over the validity of ‘claimed horsepower’ by manufacturers, with many believing the numbers have been fudged to help sales figures) I sort of mentioned this to the “technician/shop owner” that ran my bike, and got a definitive, “No, they don’t”. What the hell? Did all my mods result in an overall power loss? Thought I’d read in several publications that a stock WR250R was putting out somewhere in the neighborhood of 24 HP. I learned a lot throughout the process, but the most important lessons I learned were: any moron can buy a dynamometer but that doesn’t necessarily mean he’s proficient with it, and sometimes numbers are just numbers.I should probably start at the beginning of the process, but I’m impatient, so here’s a printout of the end result: Yes, you’re reading that correctly: 22.5 HP between 8 & 9,000 RPM. Contributing Writer: Frank MortonAfter much careful deliberation (meaning a long period of indecision) I decided to have my Yamaha WR250R dyno-tuned, so I scheduled an appointment.
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