| Author | Message | ||
     Eurotwins |
Maybe my imagination but I think I hear pinging on accell at about 3800 RPM. Can it be anything else and does this mean I'm making another trip to the dealer?...John | ||
| Eurotwins |
Any comments??? | ||
| Ingemar |
Possibly. I have heard of pinging problems on the 12 before. I don't have a 12, but I guess it depends on the mods you've done and the temperature you're riding in? Did you try a search? Pinging problems with xb12 has been discussed many times. | ||
| Xring |
My XB9 pings a little when hot, in a pull (like when accelerating going uphill in 5th gear). Doesn't the manual recommend premium gas? I use regular. Mines not bad enough to worry about. A quick downshift takes care of it. Pinging is potentially very destructive to the pistons, though. Can be brought on by timing out of whack or running lean fuel mixture. Or inadequate octane gasoline. Good luck, Bill | ||
| Eurotwins |
This is stone stock and it doesn't do it all the time....John | ||
| Thansesxb9rs |
Its your valves tapping when you accelerate hard at a lower rpm, this is normal from what I have heard with the Harley motor. | ||
| Deerhunter17 |
I've been plagued with this as well. Gasoline quality, temperature, and load ( passenger ) all contribute. I recently changed to Mobil 1 v twin, and run 93 octane from a station with dedicated pump hoses ( none of that single hose, multi grade crap ). I ran yesterday, hottest day so far this year, with a passenger and had no pinging. My mechanic ( HD guy ) says you will have some detonation ( pinging ) on really hot days, but it shouldn't be the norm. I have Race ECM, K&N, and drummer, he recommends ( if the problem persists ) checking the timing ( done ) changing the plugs ( he likes autolites ) and last resort, TFI. Ultimate performance would be achieved by tuning it on a dyno. He made a good case for the tfi, and I'll be researching the archives and following along here, and will most likely get one, and will be heading to the dyno to tune it in. Don't know if any of this is helpful, good luck, enjoy the ride. | ||
| Blake |
Tim, (Thanses), Pinging is caused by an instantaneous/violent detonation of the air/fuel mixture in the cylinder. Normally the mixture experiences a progressive burn where the flame-front travels out from the spark in a uniform gentle way, beginning with a mild combustion/burn and working its way up to complete/final ignition. Detonation is when the entire mixture in the combustion chamber suddenly ignites and combusts simultaneously. It does sound like valves hitting the seats too hard though, and I used to think the very same thing not too long ago. It is not normal and is dangerous as it produces a lot more intense heat in a shorter period of time. If it becomes severe enough and is neglected it can melt a hole into the piston. Not good. A little pinging/detonation upon takeoff at low RPM on a hot day in traffic is not too big a deal, but under any other circumstances it would be troubling and should be remedied. Engines can ping/detonate due to any number of individual reason or combinations of reasons such as poor quality fuel, or not enough octane, or dirty carbon encrusted combustion chamber surfaces (creates hot spots and raises compression), too lean of a fuel mixture due to improper fuel delivery or an intake leak that is allowing in excess air, a hot engine, or just plain lugging a hot engine. That all is not to say that your Buell engine's valvetrain won't make a lot of ticking/mechanical noise, but it will not vary in amplitude, only in frequency as the engine speed rises. You'll hear it well at idle. Not anything like pinging/detonation, which if isolated makes the engine sound a bit like a diesel. | ||
| Eurotwins |
What I find unusual is that it is only 3700-3900 RPM. I use the highest octane I can find (91) and only from Unical or Chevron and the bike only has 600 miles. I usually only hear it 1st-3rd gears but that may only be because of wind noise at higher speeds above 3rd gear. I'll try to take it to the dealer but I really don't have confidence in the tech....John | ||
| Wyckedflesh |
only 3700-3900 RPM. That is an area where the valve is moving and as such you end up with a dual path so the motor leans out for just a second. As long as your not leaving the bike there its not an issue, if you are leaving it at that RPM and allowing the ping to continue, down shift to get out of that range. Just be aware of that range for roll on from part throttle and you will learn to ride around it, or if you do need to roll it on from just below that point, roll off throttle for a couple hundred RPM then roll it on so the motor swings thruogh it faster, this gets the valve to move faster not giving it a chance to lean out. | ||
| Eurotwins |
Thanks,Thats what I've been doing either cruising just below or whacking the throttle to get past it.....John | ||
| Opto |
Check the timing too, do a search on this board on how to do it, if you know how to use a multimeter or have a mate that does, you can check and adjust it yourself. |
