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Post by deathawaits on Mar 8, 2006 0:07:22 GMT -5
Right now I have a 2-1 setup and they work fine on the stock bike, but I 'm looking at something a little more extreme for the chop. I don't want to cut up the header to build a new exhaust. I've looked on ebay, gonna get a junk header to mutilate. Has anyone cut a set of pipes? What length have you found worked the best? I want to go with header wrap and baffles like for a sporty. Easy to clean and not straight pipe loud, but close. Hehehehehe. I know I have to rejet, any thoughts? D.A.W.
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Post by grizld1 on Mar 8, 2006 0:42:22 GMT -5
Good idea to lose the 2-1. Even on machines with enhanced forks and tall rear shocks the lower pipe of the header tends to grind the asphalt if you go deep in right-handers, and with the reduced ground clearance of a chopper, they could make for grief at pretty moderate heel. One limiting factor for making power with the stock pipes is the ID--only 1 1/4". The MAC 2-2 pipes are 1/8" larger in ID. At a larger ID than 1 1/2" the low end and midrange suffer. Ditto for a length less than 34" or so. As far as jetting goes, you might wind up fairly close if your carbs are set up right for the 2-1. The Mikuni Tuning Manual from Sudco's a good place to start. It's not written with reference to the CV carbs, but the diagnostic tips still apply.
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Post by deathawaits on Mar 8, 2006 21:38:00 GMT -5
So ideally I want to stick around the stock id. and go no less than 34 inchs in legnth. I thought about running the pipes on either side instead of under/over. My Bro owns a muffler shop and we can mock it up a couple of different ways. What do you think about using the baffles? I will get ahold of the manual, gonna rebuild both carbs here shortly and I will go ahead and order a few different jet sizes.
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Post by Tom Graham on Mar 9, 2006 8:49:37 GMT -5
I like the looks of high pipes that run beside the engine on each side. Very British Twin Scrambler. you will need a heat shield, of course, but even these look good. Small diameter and long pipe is what a XS650 needs. JC Whitney has economical mandral bends in 16ga. That's a little thicker and easier to work with than most of the bends I see, most are 18ga.
You could also step the pipe up somewhere before the end if that's the look you want in the back. Example, 1 3/8" for the first bend out of the head, run that as far as possible and slip a 1.5" pipe over it. You could get up to 1.75" before the end of the pipe. It is easy to cheat at each step too (change the angle slightly to get everything to fit right) .
I hate baffles in the pipes. Let's call them exhaust plugs as that is what they are, now plugs don't sound too good. You will need a muffler that is larger than the pipe itself to work properly. My perfered sound is straight through glass packs. The bullets that came stock on English bikes are a personal favorite. You can get small ones that are used on the big single scramblers of the era. Another muffler that I would consider is the short Dunstall type reverse cone. A couple of these with high pipes would be very cool (cheap too).
Tom
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jack
Junior Member
Posts: 16
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Post by jack on Mar 10, 2006 19:44:26 GMT -5
Forget the baffles inside the pipe,really restricts the flow and you'll loose power in the long run. Slap apair of light weight glass packs on her for that deep throaty sound cuz with the 360 firing order,it will sound great. or it ya want loudness and performance slap a set of race megaphones on just make sure the exhaust exit is the same size as the header diameter ID and it will pull harder to scavenge the cylinders for efficiently........Jack
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Post by deathawaits on Mar 10, 2006 23:06:27 GMT -5
Thanks for the great feedback guys, things being brought to light, I may lean towards the glass packs, I like the brit look megaphones, we had a set on a BSA yrs ago....... I think the 'packs will work out well for the look I'm going for. I'm gonna hedder wrap the pipes and black the rest. I've seen them on other sites and they aren't very much.
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jack
Junior Member
Posts: 16
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Post by jack on Mar 10, 2006 23:15:30 GMT -5
I had a set of glass packs on my BMW R/90s and they had an awesome sound,some guy heard me start it up in my garage and thought it was a Brit twin ;D...............jack
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aero
Junior Member
Posts: 43
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Post by aero on Apr 29, 2007 14:09:54 GMT -5
A pair of Norton Commando Pea shooters work well, lound mind.
They come with two inlet sizes, I think it the smaller size you'll need, but that depends on the header pipes you have.
I have 2-2 with1 1/2" headrdes that are 33" long with the Norton silencers it seem s to work well.
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