Exhaust Question, (I think)
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Road Master
Joined: Apr 2009
Posts: 1,123
Likes: 43
From: NJ
Exhaust Question, (I think)
Hi, and yes I'm a noobie, but a decent wrench..
I'm riding a 94 FXSTC, it runs strong when you are accelerating and sounds good. At slower speeds like riding in traffic in 2nd or 3rd the pipes sort of break up and pop (or bark) a little, when you are not accelerating or decelerating. The engine does not seem to be missing but the sound makes it seem so. Plugs are good, carb is clean, fuel economy is good, no smoke, it really runs well. It has Python staggered slashcut pipes with some sort of bafffles in them-(I just picked up the bike).
I'm thinking there is not enough back preasure in the pipes but I am new to this. Or maybe the slow speed sircuit in the carb? I know it's hard but anyone have any ideas or is there a way to test it without buying a bunch of baffles to try out.
Pic of the pipes:
https://www.hdforums.com/forum/attac...1&d=1248614955
Thanks,
Doug
I'm riding a 94 FXSTC, it runs strong when you are accelerating and sounds good. At slower speeds like riding in traffic in 2nd or 3rd the pipes sort of break up and pop (or bark) a little, when you are not accelerating or decelerating. The engine does not seem to be missing but the sound makes it seem so. Plugs are good, carb is clean, fuel economy is good, no smoke, it really runs well. It has Python staggered slashcut pipes with some sort of bafffles in them-(I just picked up the bike).
I'm thinking there is not enough back preasure in the pipes but I am new to this. Or maybe the slow speed sircuit in the carb? I know it's hard but anyone have any ideas or is there a way to test it without buying a bunch of baffles to try out.
Pic of the pipes:
https://www.hdforums.com/forum/attac...1&d=1248614955
Thanks,
Doug
Thread Starter
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Road Master
Joined: Apr 2009
Posts: 1,123
Likes: 43
From: NJ
I has the sock cv carb with a power slide kit and a Crane CV3 cam & etc. I have no idea what the jetting is and I've got my nose burried in the carb section of the S/M...LOL
Thanks
Doug
Thanks
Doug
Cruiser
Joined: Jun 2009
Posts: 104
Likes: 1
From: Richland, WA
How are you doing with that? I don't think the factory has any tuning info in their manuals. You might want to find out what jets are available through the parts counter and then experiment one step at a time. I would go a size larger (a little more rich) for the slow speed jet and see what happens. Otherwise, I highly recommend the Mikuni carb that HD sells for them. They do work better and are set up pretty good right out of the box. They are more tuneable if need be. I can't tell from the picture but do the pipes have a crossover like the factory? Probably not, and that doesn't help but the lack of a crossover shouldn't prevent you from getting your low speeds dialed in - just harder.
Last edited by billiamharley; Aug 23, 2009 at 08:40 AM.
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Road Master
Joined: Apr 2009
Posts: 1,123
Likes: 43
From: NJ
Bill,
I'm still at it but learning alot. The pipes are 1 7/8s ID so my choice of different baffles is rather limited. I did mess around with cheap Custome Chrome ones(cut/weld/drill & etc), and got it running smooth in all ranges but it also ran like a showroom bike..(slooow/quiet)-too constricted. I've had the carb off and totally cleaned it, increased the slow speed jet and it ran better but too rich, I've tried 3 jets 45,46,48 and can change them in 15 min by just dropping the bowl. I'm currently running the 45 with the original baffles (HD Chrome Werks) and I added a 3/4 washer (popsicle) to them. The power is good, no flat spots or black smoke, mileage seems good but I still get a pop/crackle on slow speed decel sometimes. Next step is to take a pipe cutter and lop off the slash cut from the pipes. After that you will see yet another thread on "Help me pick out my new Pipes"....LOL
BTW: I made a nifty tool for removing stuck baffles, 3'long/3/8s stainless rod with a slight hook on one end and a "U" on the other. Hook it on the baffle, back is better, take an air chisel with out the chisel and put the "U" end in it. Run the chisel slow and it will work them right out with no damage. No more yanking or banging stuff with a hammer...
Doug
I'm still at it but learning alot. The pipes are 1 7/8s ID so my choice of different baffles is rather limited. I did mess around with cheap Custome Chrome ones(cut/weld/drill & etc), and got it running smooth in all ranges but it also ran like a showroom bike..(slooow/quiet)-too constricted. I've had the carb off and totally cleaned it, increased the slow speed jet and it ran better but too rich, I've tried 3 jets 45,46,48 and can change them in 15 min by just dropping the bowl. I'm currently running the 45 with the original baffles (HD Chrome Werks) and I added a 3/4 washer (popsicle) to them. The power is good, no flat spots or black smoke, mileage seems good but I still get a pop/crackle on slow speed decel sometimes. Next step is to take a pipe cutter and lop off the slash cut from the pipes. After that you will see yet another thread on "Help me pick out my new Pipes"....LOL
BTW: I made a nifty tool for removing stuck baffles, 3'long/3/8s stainless rod with a slight hook on one end and a "U" on the other. Hook it on the baffle, back is better, take an air chisel with out the chisel and put the "U" end in it. Run the chisel slow and it will work them right out with no damage. No more yanking or banging stuff with a hammer...
Doug
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