Need header info

ahdoman · Post by **ahdoman** » Tue Jun 07, 2005 2:59 am

Does anybody know what the "route" is on the header pipes? In other words are they 2 into 1 into 2? If not what is the purpose of the "X" junction under the engine?

Post by **Skins** » Tue Jun 07, 2005 3:29 am

Looking at the drawing in the parts book, it looks very much like both headers flow into both cans - which is not a bad idea, I'd say, because the pressure from each exhaust would help the other.

Gwenadu · Post by **Gwenadu** » Tue Jun 07, 2005 10:14 am

I f you stop one of the cans you will see the flow of the other one doubling...

fasterdammit · Post by **fasterdammit** » Tue Jun 07, 2005 1:10 pm

I think it's still referred to as 2-into-2; the crossover is really only a junction that serves to equalize pressure and duty through both cans. Like Gwenadu said, if you block one can, you'll see all the exhaust come from the other - but you'll probably also notice the performance start to dip, since you only have one can to pass all the exhaust. Having the crossover helps maintain backpressure to the non-exhausting cylinder as well.

ahdoman · Post by **ahdoman** » Tue Jun 07, 2005 3:04 pm

Thanks guys. I'm getting a little backfiring under 1/3 throttle and it appears that it seems to only be coming from the right pipe. If I get on it (above about 4k) it goes away and it is not there at idle (under 1k). I was hoping to assume that if it was one pipe then I could figure out which cylinder was the problem. I guess I'll have to once again strip the plastic to get to the guts.

Post by **jcslocum** » Tue Jun 07, 2005 5:55 pm

What carb/carbs are you running?? On my Dell's I would get a cough/backfire at 4500 RPM so I lifter the needle up 1 notch to richen the mixture slightly at mid revs and it has gone away.

The exhaust is a 2 into 2.

ahdoman · Post by **ahdoman** » Tue Jun 07, 2005 9:37 pm

I'm running the Dell's also but I think this may be more than a lean/rich problem. I got the bike back from a local shop a couple of weeks ago (not a Duc shop just a local tuner (Vance & Hines)). They sync'd the carbs and the bike ran the best it's ever ran. I rode it for a couple of days. It sat for about 2 days and when I went to ride it yesterday the backfiring and popping was there from the moment it started. I think it is still part of the random Magneti Marelli ignition problems. I was hoping to be able to tell what cylinder it was by listening to the exhaust but since it combines I need to tear the plastic off and see if I can trace it down.

Post by **jcslocum** » Wed Jun 08, 2005 1:17 am

If it's electric, then just start by cleaning every connector.

Did you fuel up before putting the bike away after the last ride?? How old is the fuel filter?

Last but not least, do you know what jets your running in the Dell's?