Zero Knievel Posted August 24, 2013 Share Posted August 24, 2013 Something I've noticed. Not sure where to start checking. Took the bike out for a short run. At about 4,500 RPM and above, there's a "vibration" I can feel that I don't think should be there. At higher RPMs it is still there (felt mostly through the hand grips), but it is most noticeable around 4,000-4,500 RPM when I can feel it both through the hand grips and the foot pegs. Don't feel anything under 4,000 RPM. Idles fine. Sounds fine (as far as I can tell). To be fair, it has a full tank of gas, but I last gassed up weeks ago. Without burning through a whole tank to refill, I don't have an easy way to put in "new gas" and see if it goes away. IIRC, I used fuel system cleaner at the last fill up (B12 Chemtool). What things could it be and what should I watch for? Quote Link to comment Share on other sites More sharing options...
Iceman_40 Posted August 24, 2013 Share Posted August 24, 2013 CCT? do you hear a noise too...? Kink in chain? Check the basics first Quote Link to comment Share on other sites More sharing options...
cecome Posted August 25, 2013 Share Posted August 25, 2013 Can it be duplicated while in the garage? If not maybe as was mentioned the chain or sprockets. Just shooting from the hip here. Let us know. Quote Link to comment Share on other sites More sharing options...
John01XX Posted August 25, 2013 Share Posted August 25, 2013 I would guess tires first! Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted August 25, 2013 Author Share Posted August 25, 2013 I know it's not the CCT. I've had mine go before, and I'd recognize the sound. I don't think it's the tires but since I kept it in 3rd to test the RPM range on roads I couldn't go too fast on, It's possible it's speed related and not RPM. I'd have to try different gears and see if it occurs at a speed or at a RPM range. Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted August 25, 2013 Author Share Posted August 25, 2013 Took a good ride. It's definitely RPM related. I put it up on the center stand and tried running it up without it in gear. It's even more noticeable...even at lower RPMs. Definitely something in the motor making it run "rough." I remember checking the valve clearances a couple years back. All but one were well within spec, and the lone anomaly was on the edge of what was permissible. I wasn't going to tear things down for a minor adjustment. I don't know if that could be the issue. Plugs haven't been changed for a couple years (IIRC)...but I haven't been riding that much in the last couple of years. I don't expect it is bad gas. IIRC I put in B12 Chemtool at the last fill up. FPR? What symptoms does it produce when it's not working right? I should go and disconnect the PCII and see if it goes away. Nothing should have changed as I've not touched the map in years. 1 Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted August 27, 2013 Author Share Posted August 27, 2013 Bump for new ideas? I don't want to ruin the motor if something's going wrong. Quote Link to comment Share on other sites More sharing options...
EVLXX Posted August 27, 2013 Share Posted August 27, 2013 sounds like maybe a mild misfire... Do you have a Power Commander? Knock sensor? Could be a spark plug has gone bad? Or maybe it's a Tumor! Quote Link to comment Share on other sites More sharing options...
blackhawkxx Posted August 27, 2013 Share Posted August 27, 2013 I should go and disconnect the PCII and see if it goes away. Well, did you do this? Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted August 27, 2013 Author Share Posted August 27, 2013 sounds like maybe a mild misfire... Do you have a Power Commander? Knock sensor? Could be a spark plug has gone bad? Or maybe it's a Tumor! Tumor...definitely a tumor. (I miss the animated GIFs) Silly me...I haven't tried unplugging the PCII and seeing if it goes away (just to eliminate it as a cause). It shouldn't be due for a plug replacement...I did one in January (unless something's happened). There's a knock sensor? What are the signs of impending FPR failure? I've not touched mine and I have over 85K on the clock. Quote Link to comment Share on other sites More sharing options...
RodeRash Posted August 27, 2013 Share Posted August 27, 2013 Check the logo on your tank. Maybe someone replaced your Blackbird with a Busa. They have a vibration point around 4500. Quote Link to comment Share on other sites More sharing options...
XXBirdSlapper Posted August 27, 2013 Share Posted August 27, 2013 Perhaps your crankshaft has developed a crack in one of the rod journal area. Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted August 27, 2013 Author Share Posted August 27, 2013 Perhaps your crankshaft has developed a crack in one of the rod journal area. Let's hope not. I'd like to see what I can check without tearing down half the bike to do it. I know that's not much, but I'd feel stupid if it proved to be something simple. Quote Link to comment Share on other sites More sharing options...
slowrideCX Posted August 28, 2013 Share Posted August 28, 2013 Have you ever adjusted the counter balance shafts? There is 3 adjustment points and a set sequence for adjusting. Check you manual for this. Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted August 28, 2013 Author Share Posted August 28, 2013 Have you ever adjusted the counter balance shafts? There is 3 adjustment points and a set sequence for adjusting. Check you manual for this. 1. No. 2. First I ever heard of such a thing. Quote Link to comment Share on other sites More sharing options...
The Krypt Keeper Posted August 28, 2013 Share Posted August 28, 2013 Counter balance would be a good start and gas being shitty. My xx hates high octane gas. If I am somewhere that only has 93 or so I get half a tank so I can find 87 and fill it up. Whole bike will get buzzy in pegs and bars. 2 Quote Link to comment Share on other sites More sharing options...
blackhawkxx Posted August 28, 2013 Share Posted August 28, 2013 Counter balance would be a good start and gas being shitty. My xx hates high octane gas. If I am somewhere that only has 93 or so I get half a tank so I can find 87 and fill it up. Whole bike will get buzzy in pegs and bars. Please explain how or why this would happen. Quote Link to comment Share on other sites More sharing options...
slowrideCX Posted August 28, 2013 Share Posted August 28, 2013 The counter balance shafts reduce the vibration from the motor if the gears that drive them get to where they may need adjustments then it will cause a slight buzz as he is describing. Quote Link to comment Share on other sites More sharing options...
The Krypt Keeper Posted August 29, 2013 Share Posted August 29, 2013 what Stefan said about the balaners.. as for the fuel. honda made the bike to run on regular unleaded gas and not high test with a mild 11:1 CR. My power commander is tuned for where I ride the most (normal operating speeds) yet when you ask for it, you shall receive. (keeping lean and rich spots to a minimum) all on 87, no pinging or anything. you thin the mix or richen the mix and you get different results. You change octane and you get different results. 87 bangs easier than 93 and it bangs sweet in my XX, soon as I am forced to run higher octane the buzziness begins. higher octane don't mean more power or better running. Always stick with running what runs the best and doesn't ping. funny how many people actually run 93 or higher octane in a stock bike without ever know what was recommended.. just the mind set of higher octane makes more power. 1 Quote Link to comment Share on other sites More sharing options...
blackhawkxx Posted August 29, 2013 Share Posted August 29, 2013 funny how many people actually run 93 or higher octane in a stock bike without ever know what was recommended.. just the mind set of higher octane makes more power. That may be true but I don't see how it would make it run bad. I have tried 93 in everything from all my bikes to my F-250 with no bad results. Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted August 29, 2013 Author Share Posted August 29, 2013 What part of the manual does the counter balance shaft fall under? Quote Link to comment Share on other sites More sharing options...
The Krypt Keeper Posted August 29, 2013 Share Posted August 29, 2013 93 is harder to bang than 87. So maybe my bike being tuned to run 87 doesn't like the higher octane. Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted August 30, 2013 Author Share Posted August 30, 2013 What part of the manual does the counter balance shaft fall under? Bump for this. I'm not having luck finding it. Quote Link to comment Share on other sites More sharing options...
tomek Posted August 31, 2013 Share Posted August 31, 2013 12-22 Quote Link to comment Share on other sites More sharing options...
Zero Knievel Posted August 31, 2013 Author Share Posted August 31, 2013 12-22 Thanks...bookmarked. Crap...looks like I gotta open up the crankcase to get to it. No way to check it without tearing stuff down, right? Quote Link to comment Share on other sites More sharing options...
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