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From that wikipedia article: "Up to 120 minutes of recovery time can be required of noises of only 95 dB. For comparison, common items that can produce noise at this level are motorcycles and subways"

Loud noise exposure causes "temporary threshold shift" (TTS), basically reducing your ear's sensitivity to sound (making your hearing worse): https://en.wikipedia.org/wiki/Auditory_fatigue Excess noise also causes physical/mental fatigue. So ear plugs keep noise levels down, avoiding TTS...

I went out to the garage and tugged my shaft a few times for you. I measured less than 1mm (<0.039") of movement. It definitely moves enough and makes noise to be obvious that there is some play. Bustanut is probably the forum expert on the topic of playing with the ends of shafts, so he...

Hey... who ever said anything about raping air boxes? I only stretch their holes wider with small power tools.

The O2 sensor is before the cats. The wide-band O2 sensor replaces the stock narrow-band sensor. The stock O2 sensor wouldn't work very well either if the bung was after the cats. The cats are right where the 2 separate pipes come out of the collector (going to each of the mufflers; there's a...

The service manual does not mention the pink dots or any other specifics about aligning the clutch plates. I just put mine back in without caring about their orientation, and my bike hasn't exploded yet.

MPG is so dependent on local and personal factors that I won't try to answer beyond the general idea that you will obviously see a reduction in MPG if you have the fuel injection system modified in any way to provide more fuel in partial throttle cruising RPM ranges. Try leaving the stock...

Wicked Webby showed dyno results: https://www.fjrforum.com/forum//index.php?showtopic=102302 There's a significant gain (up to 10+%) in the 3700 to 5200 RPM range. He did some crude fuel adjustments via the CO settings and has stock header with Remus Hexacone slip-ons. The only difference...

No need to disconnect the PCV before going into DIAG mode. The PCV does not interfere with any ECU signals, except for the outgoing fuel injection signals. Even there, the injector diagnostics would still work fine.

OK, I lied. My bike's TPS ranges from 0.711v at 0% throttle to 4.140v at 100% throttle. I just remembered that I have easy access to testing the TPS signal thanks to one of my crazy projects.

I don't have a habit of checking my TPS signal with a voltmeter, but I can tell you that 0% throttle will be somewhere at the low end of the 0-5v range, and 100% throttle will be somewhere at the high end of that range. Follow the instructions for calibrating the throttle on the PCV and don't...

So my bike should sound like one of these if I cut that off?

The purpose of that thing you cut off there is probably to place the effective air inlet of the air box equidistant from the four intake tubes so that they can all suck in equal amounts of air. Cutting it off may cause some imbalance. Cutting another inlet opening into the air box on the...

If my bike was stock, I could have answered the question exactly with the data logger on my Motty AFR tuner, but my bike isn't stock. The best I can do is add to Fred's post by saying that 13.2:1 is the common AFR target for 100% throttle when dyno tuning a bike. The stock fueling must be richer...

One benefit to using all 4 ports for the cruise control (beside the obvious good feelings that come with symmetry) is that it becomes very easy to get to those ports for a throttle body sync. No more fiddling with those tiny rubber caps and retainer clips!

Just install a vacuum-powered cruise control system and hook up hoses to all 4 of those synchronization ports. It's really easy to grab those hoses and pull them off without fear of dropping them and losing them in the engine's abyss: That was in reference to using the larger caps to block...

But this one is a technical explanation based on discussions with the plug manufacturers themselves. I guess some people will never believe the experts and will treat their recommendations no different than the opinion of a forum member.

BTW - to put the effects on top speed in perspective, the difference between the best possible and worst possible drag-limited top speeds on the FJR is only 3.5mph. (first post updated to contain this tidbit)

If you look at it based on engine speed only, then yes, shorter gearing will always have a mechanical advantage over taller gearing at any given RPM. But it's ground speed that matters. Shorter gearing gains mechanical advantage at any given RPM, but equally loses ground speed at that RPM...