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Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by Platypus-3in1, Mar 14, 2011.
Read the post I quoted.
reinstalled 2 into 1 roxx pipe with high temp silicone gasket sealant: no better, no change, dang it!
I have the SAS plates/cannisterectomy done and recently installed the Roxx system with no sealant etc. I'm even using generic throttle return springs in place of the exhaust springs that weren't included when I ordered the system. Sounds great (wind it to red line and it absolutely wails, absolutely no decel popping).
I had a carbon Remus with an adv 2-1 previously. The rivets holding together the intake side chewed into the carbon can enough that l had to epoxy it back together before a 3 state trip last fall, which worked well. I had several issues sealing that system, both were the can bolts to the 2-1 and where the 2-1 fits onto the header pipes. The Roxx appears tight as a frogs sphincter first time on.
I personally don't think the adv 2-1 construction affects anything significantly, but there is no doubt that the fabrication of the Roxx 2-1, really the whole system, is much more precise and the design seals better than what I had on there before.
Took out the restrictor / spark arrestor and rode to work with the Roxx. The top end ROXX!
How much louder is it on a scale from "Not much" to "Holy shit!"
i bet it's: Holy shit that crap is loud as fuck! (and i toned it down profanity wise)
Without the insert the ROXX is definitely not quiet but still sounds great. I haven't ridden mine with the insert yet so will have to try it out one day to hear what it is like.
Without the insert it is quite loud, but not stupid loud. It is a very sweet sound. Has a real strong top end to it. It breathes so free that there is a bit a of a stumble with a large quick throttle opening off idle with no secondary throttle butterflies installed.
It is a little too reasonable with the Euro compliant restrictor / spark arrestor. Just the right thing for a moto trip though. I'm trying to get a friend of mine to make a less restrictive spark arrestor. The top end performance suffers a bit with the restrictor, but there is no stumble off idle.
Old thread, but informative enough to resurrect.
When you buy a 2 into 1 pipe, check inside how it looks. I got this from Adventure Spec, but had to send it back. Very small opening inside and the end of the pipe coming from the rear cylinder had been hammered partially flat to make it easier to weld on the other half.
Next I ordered pipe from our Polish friends, 21Brothers. It is rough on outside - and inside, but openings are somewhat ok-ish.. :huh It doesn't fit very well, but good enough for now.
Bike runs fine, a bit louder and rougher sound, but it sounds good on a forest leg I have a Wings can with the small insert, not sure if that is too restrictive.
I originally had the AdvTank 2:1. It was better than your AdventureSpec one but there was still a pronounced restriction where the rear cylinder joined (i.e the opening wasn't large enough). The AdvTank also had poor fitment, a known issue that I believe still has not been fixed, see: http://www.advrider.com/forums/showpost.php?p=19456528&postcount=9
I got a CJ Designs 2:1, fit was perfect (since it's based on an OEM header). There was a little bit of cruft (similar to your Polish one) that I removed with a dremel extension.
I'd recommend the CJ one.
I'm not sure if the AdventureSpec's pipe is the same as ADVTank, but they use same pics and info for marketing. After I got the pipe, did some digging and found some of your posts mentioning that people haven't been happy with their ADVTank pipes. So I figured it's the same scheisse.
I knew about CJ, but was trying to find something I didn't have to pay customs.
I could've made my own from the stock collector (still might), but it's worth of 300 euros and might want to use it some day.
Hmmn I would not have thought they were that expensive but you're right, $340. I guess the prevailing used price is $225 as that's what CJ charges for core. I just paid the core and kept my original, like you, I figure I might need it someday (go back to 2:2).
Yeah, an expensive piece of art. Should clean from the inside to see how it looks there.
I was actually surprised to read that you felt the need to clean after CJ's work.
It's one thing to do your own, it might look like a porcupine with all the MIG wires sticking out and you'd be happy with your work, but to buy one that was advertised to be a piece of art that it certainly isn't, is an other.
There was a little bit of beading but (looking at your pics again) it was much better than your second Polish one. I'm sure it would have been fine as is, but since I have a dremel extension it was easy to take 10 mins and clean it up.
No metion of jetting ... Anyone run any of these 2-1 setups on a 950? If so did the manufacturer supply a starting point for jetting setup?
I have the 2-1 GPR Rally system on my otherwise stock 950, no mention of re-jetting anywhere (in fact they state it's not necessary).
That said, it's defenitely running a bit lean.
160/165 for that one @sea level
Any one got a left hand akro hexagon or ti oval muffler they want to sell
After many tears, bloody knuckles, and a thrown wrench or two my home made 2-1 FMFQ (modified) 2004 950 is finally running decent.
Temp: 100 F
Clips @ 3
IMS @ 2.0 and 1.75
Pre-filter on and K&N style oil/cotton filter
EPC removed, SAS removed, cats gone otherwise stock
Feels like clips may need fine tuning but it runs
On my 05 950 I have a 2-1 with a ti Remus and a prefilter. Stock jetting and it runs great.