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Post by mhanks71 on Jul 30, 2009 23:21:42 GMT -5
Almost Every thread I read says to used stock size 1 1/2"OD tubing on a stock motor . Most of the sites I've found selling Exhaust use 1 3/4"OD tubing. Some trheads I read says the stock xs650 exhaust is "choked" enough already . Is it that bad to use the 1 3/4"  ? Will I lose alot of low end ? What about TPO's and EPO's ? Please help ! |
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Post by 5twins on Jul 31, 2009 8:38:42 GMT -5
If you're going to use 1 3/4", you'll need the TPO's and EPO's. With 1 1/2" single wall, you can use just the EPO's. Yes, the stock exhaust is choked off but it's double wall. While it shows like 1 1/2" on the outside, the I.D. is much smaller, something like 1 1/4".
The 1 3/4" exhaust is for racing. It moves the power band way up in the RPM range, sometimes even at or above redline. That's not very practical for a street bike. This motor likes a smaller pipe up by the head. By using the EPO's, you "fool" it into thinking it has one.
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Post by mhanks71 on Jul 31, 2009 17:39:01 GMT -5
What is the gauge thickness of the single wall ? I found a few places to buy Tubing for exhaust and they have 1 1/2"OD with 16 or 18 gauge . What would be best ? Thanks for the help in advance .
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Post by grizld1 on Jul 31, 2009 19:04:30 GMT -5
Standard thickness is 18 ga. 1-1/2" pipes are available from Mike's XS and MAC.
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Post by mhanks71 on Jul 31, 2009 22:26:26 GMT -5
The only problem I have is I really don't like the way the stock exhaust has more of a curved radius compared to the ones I like that come out of the head a little more and has sharper curves and goes straight gown and straight under . Ardcore,G&L,Scott and a few others have some real nice ones but Im on a budget. Does Mikexs have some like that ? I want to run straight pipes with a mild baffle.
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Post by grizld1 on Aug 4, 2009 9:40:46 GMT -5
Mike's XS pipes are illustrated on his site, and I can't tell you more than the pictures can. Wide-radius pipes are better for flow, but just about everything on the aftermarket uses the angular close-radius bends you prefer. For performance you're much better off with a good-flowing muffler than with a baffle inserted in a straight pipe; that setup may look trick, but it's a flow killer.
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Post by mhanks71 on Aug 7, 2009 23:59:24 GMT -5
Thanks for the info .
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Post by islanddave on Aug 11, 2009 22:50:42 GMT -5
Well for what it's worth this is the system that I run. It's Mikes 1.5" head pipes and his newly designed 17" reverse cone muffler with the mechanical baffle. Its plenty loud with a lot of flow. www.youtube.com/watch?v=tvtv3Nr9oxEDave |
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Post by mhanks71 on Aug 18, 2009 20:27:09 GMT -5
Running something like that would you have any suggestions for jetting on my bs34's ? It sounds great though.
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Post by islanddave on Aug 19, 2009 17:01:16 GMT -5
I haven't a clue......sorry I am more familiar with the VM's. Best bet would be to get the set up and then play around with the jetting. Buy a couple of larger jet sizes and a different tapered needles to have on hand and play around till you get it right. Maybe Mike could direct you since these were dyno tested and developed mufflers, he might have access to the jetting specs of the carbs used.
Dave
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Post by bikerguy2222 on Sept 11, 2009 7:18:35 GMT -5
Only DUMB question is one you dont ask I guess. BUT what are TPO's and EPO's ? Thanks |
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Post by grizld1 on Sept 11, 2009 7:46:11 GMT -5
Those are exhaust inserts by Michael "Mercury" Morse of 650 Central. EPO=Exhaust Prt Optimizer, TPO=Torque Peak Optimizer. Have a look at MMM's explanations and descriptions at www.650central.com . Pipe length determines where peak power occurs, pipe diameter determines where peak torque occurs. Oversized pipes move the torque peak way up the rpm scale. The TPO sleeves down the pipe outlet to move the torque peak back into usable range and match it to the power peak. |
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Post by bikerguy2222 on Sept 11, 2009 14:40:27 GMT -5
hey thanks for the info. I have seen various inserts before just never heard them called that. Rite on that helps quite a bit
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Post by grizld1 on Sept 11, 2009 19:30:40 GMT -5
Just to confuse the issue a little more, I don't want to imply that 1-3/4" pipes without inserts won't work on a stock 650. I know two guys (one a professional motorcycle tech and the other a first-rate amateur wrench with years of XS650 experience) whose bikes run very well without them using OEM carbs (BS38's on one bike, BS34's on the other). As far as performance is concerned the setup isn't optimal, but it can be made to work well. Tuning is touchier without inserts, but it's doable. That having been said, I strongly recommend the inserts or 1-1/2" pipes with exhaust port inserts.
BTW bikerguy, your question was far from dumb; we get a little thick with the alphabet soup sometimes!
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ktoy
Junior Member
Posts: 52
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Post by ktoy on Feb 2, 2011 1:28:48 GMT -5
what about omars twin tracker pipes.with the redosers up at the head
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? Will I lose alot of low end ? What about TPO's and EPO's ? Please help !
