| Author | Message | ||
     Earwiguhuhuh |
I bought an 08 Ulysses xb12xt and brought it home today. It has a Drummer installed and on deceleration it pops/backfires. These aren't crazy loud backfires but defiantly pops. I asked this on another forum because this one is jacked up today and got lots of different opinions and replies. I'd like to take the cheapest route to fix this if it is even an issue so I ask... Do I have an issue or are these pops/backfires normal with the Drummer pipe? Would you suggest a Dyno Tune? Erik Buell Racing ECM? TPS Reset? Do they even do TPS rests on 08 Ulys? Thanks for any info/retrogradations any of you have. Also, if anyone is in NJ and wants to fix this for me I'm willing to pay as long as you don't rip me off  Thank you. | ||
| Froggy |
Popping is normal for a bike running an aftermarket pipe with the stock tune. It will still pop a bit with the stock exhaust, but it is a lot harder to notice. Your best bet is the Erik Buell Racing ECM, they did all the homework and hard work for you, and will transform the way your bike performs. Yes there is still a TPS reset, but it can be quickly done with a special combonation of throttle input while the engine isn't running. No need for external software or a computer | ||
| Earwiguhuhuh |
Froggy, thanks for the reply. A couple more questions if you don't mind. Is the popping bad for the bike? It isn't obnoxious and I actually like how it sounds but I don't want to harm anything. Also, will I need to perform a TPS reset after I install the Erik Buell Racing ECM? Do you have the instructions on how to do this? Thanks again. | ||
| Froggy |
Not required as the bike automagicly does it every so often, but it can't hurt to do.
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| Earwiguhuhuh |
Froggy, thanks again, this really helps. I'm going to do a TPS reset tomorrow morning just for the hell of it. I hate to ask the same question again, but is decel popping bad for the bike? Not loud crazy backfires... but pops on deceleration/engine breaking. TY! | ||
| Hughlysses |
Minor backfiring like that won't hurt anything. My 1983 Honda Ascot was jetted lean from the factory to meet emissions regs and backfires like that on deceleration. I've read that what happens is the mixture is too lean to fire, so unburned fuel/air mixture accumulates in the exhaust until there's enough fuel to be ignited and you get a "pop". You aren't going to burn valves or anything like that. | ||
| Anonymous |
Could be loose header stud nuts or flange gasket.Check for exhaust leaks. | ||
| earwig |
Any tips or tricks for checking for leaks? Aside from aside from making sure all the bolts are tight? | ||
| WasAesquire |
While exhaust pops won't hurt the engine itself, it may eventually loosen or damage the exhaust system. Hughlysses explanation might be right, but my experience is that you have unburned fuel in the exhaust that ignites on a later exhaust flame front. Aftermarket cans don't have the same pressure wave characteristics as stock.....that's why they may give more power and are louder. Stock systems are tuned for minimum noise at a certain rpm and to stuff unburned fuel vapor back in the cylinder for pollution control. It's a balance of cams, heads, FI, Spark, intake & exhaust. Also, could be an air leak as Anonymous says. |
