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post #1 of 15 (permalink) Old 05-17-2013, 07:02 PM Thread Starter
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power loss

i gt a 107 has about 650 miles on build , an i had dyno again an it has lost 4hp an 6 tq i have rev perf self tuning system on it an fuel looks the same as before , what could make it lose power,at 1st it 102hp an 110 now 98 an 106
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post #2 of 15 (permalink) Old 05-17-2013, 07:40 PM
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I'm no tuner but a few things come to mind that could make a difference such as different Dyno, different Tech doing the tuning, different weather, different fuel and I am sure the tuner guys out there can come up with more reason. To many variables.

The real question is can you feel a difference and are you happy with how she runs?? If you cannot feel a difference and you are happy, no worries


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post #3 of 15 (permalink) Old 05-17-2013, 08:19 PM
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I agree with triplej as far as the cause for the difference. My question would be what cams did you go with and did you do anything else besides changing jugs and pistons? Power seems a little low for a 107 build.

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post #4 of 15 (permalink) Old 05-17-2013, 11:25 PM Thread Starter
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same tech done the dyno, im wondering if i have broke a ring
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post #5 of 15 (permalink) Old 05-18-2013, 01:11 AM
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Any other symtoms besides loss of power? Smoke? Noise? Etc?

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post #6 of 15 (permalink) Old 05-18-2013, 09:03 AM
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What was the Temp/Humidity that day compared to last time it was tuned.Low tire pressure can also be a contributing factor.Also did he run it in the same gear.The higher the gear the better the number.
post #7 of 15 (permalink) Old 05-18-2013, 09:37 AM
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Less than 4% difference?? I'd crumple up the 2nd chart, throw it in the garbage and ride away happily. Dynos are FAR from absolute, there's a whole raft of things that can cause that small amount of a difference, and motor problems are WAY down the list.

2015 RGU CVO........under continuous change......
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post #8 of 15 (permalink) Old 05-18-2013, 10:11 AM Thread Starter
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humity was 34% on the good pull an 58% on the bad dyno,
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post #9 of 15 (permalink) Old 05-18-2013, 11:30 AM
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Humidity, barometric pressure, air temperature, engine temperature, oil temperature, ethanol or non-ethanol gas, tire pressure, filtering/smoothing level on the computer that draws the graph, throttle technique, transmission gear...........the list goes on and any one of them can account for the difference you're seeing.

Fuel is a big one, and "race" fuels are the worst as most of them are junk unless they've been stored and handled just right.
"Oh but I was running 94 octane pump gas". Yep, that's great, how many people are buying that at 50 cents over regular and how long has it been laying in the underground tank??
"But my motor doesn't ping at all when I run that gas......" Well of course not, the crap won't even burn, how's it gonna ping??

Computer settings are huge, everything from the weather numbers entered to the calibration settings, to the filtering levels used to make the graph pretty.

Not trying to bust anyone's balls, just a little truth and education.

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post #10 of 15 (permalink) Old 05-18-2013, 12:00 PM
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Dyno your bike everyday for a week and you will have a weeks worth of different results.
Like others have said, every little detail makes a difference.

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Oh and its black because blacks faster.
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