killerST6
Re: STock Exhaust Modifications.
Pete if you ever head down to Ga or heck close lol, let me know I would like to hear her.
Pete if you ever head down to Ga or heck close lol, let me know I would like to hear her.
Article [13] ST1300 - STock Exhaust Modifications
- Thread starter 100MPG
- Start date
OP
OP
100MPG
Convert
Re: STock Exhaust Modifications.
I have gotten 45-52 mpg on several tanks in a row so I do think the MPG's are a little higher with the modified pipes...
mikest1300
Re: STock Exhaust Modifications.
do know where the cats are located in the muffler and what type bb's or ?
is your st a 2008 thanks
do know where the cats are located in the muffler and what type bb's or ?
is your st a 2008 thanks
Smallville
Scott
Re: STock Exhaust Modifications.
The cats are located in the front of the muffler where it starts to get larger. They run from the large round part back into the triangle part. It is the honeycome type cat.
The cats are located in the front of the muffler where it starts to get larger. They run from the large round part back into the triangle part. It is the honeycome type cat.
NCrider
Andrew Seawell
Re: STock Exhaust Modifications.
I'm interested it this for heat reason.
The heat if fine everywhere else, but my feet cook....and yes I wear nice thick boots.
Did it help the heat at your feet?
I'm interested it this for heat reason.
The heat if fine everywhere else, but my feet cook....and yes I wear nice thick boots.
Did it help the heat at your feet?
michaelk12
Re: STock Exhaust Modifications.
picked up a pair of mufflers and pipes cheap on ebay, own a v65 sabre and love the sound of it, will try the punch through mod myself here shortly. Was originally thinking of gutting the mufflers and packing them slightly with some high quality steel wool similar to the way glass packs used to be packed.
picked up a pair of mufflers and pipes cheap on ebay, own a v65 sabre and love the sound of it, will try the punch through mod myself here shortly. Was originally thinking of gutting the mufflers and packing them slightly with some high quality steel wool similar to the way glass packs used to be packed.
treemuncher
Vegetation Terrorist
Re: ST1300-STock Exhaust Modifications
I did the "punch out" modification on a '78 Harley Sportster many, many years ago. The bike stayed quiet at idle but it certainly opened up the top end and it would shoot blue flames out the exhaust on decel at night time. It had a nice mellow bark on hard acceleration, too. It really helped that p.o.s. perform better but nothing ever helped it to stop or handle a corner.
Ever since owning the ST I've been thinking of doing the same mod, but I did not want to chance messing up my ST with negative results. Now I have done it, many thanks to Mondo for giving me his old stock cans to experiment with. So far, I've only put on 150-200 miles since the modded cans were installed but the fuel economy does seem to have improved according to the bike's computer. Note: my '07 had a heat shield on the left exhaust for the ABS brake lines, his cans did not have that same heat shield.
In order to punch these out to the maximum diameter without hurting the outlet tubes, I custom cut a punch out tool on the lathe within 0.015" of the tube's inner diameter and mounted that on the end of a 0.500" steel rod to hammer it home in 2 or 3 hits. It works great.
I have a sound meter so I took before and after mod readings with the bike in the same location at various rpms. The meter was set approx 12' behind the back of the ST (on center stand, bags & top box on) and approximately 3.75 feet high. The sound meter was set on slow response and varied on the A & C weighting options. The results are as follows:
RPM A position C position
idle 70 db 84 db stock
69 db 82 db punched out
4000 rpm 82 db 90 db stock
84 db 89 db punched out
6000 rpm 86 db 95 db stock
85 db 92 db punched out
It does not seem right that the end result was mostly quieter than stock. Perhaps the drop in pressure and minimized length of travel may have an effect on the output noise levels. The amount is negligible anyway. I checked the battery before and after taking readings and it was still good. The meter's position was not changed during any of the data collection. I believe the numbers to be valid.
I took the bike for a ride with the modded cans and I did not notice any sound difference at all except for some popping on downhill engine braking. The fuel economy meter showed an increase but the ride was too short to draw conclusions on that matter. The "seat of the pants" meter showed about the same but I rarely twist the throttle fully anyway. So far, I'm happy to keep this mod in effect.
Anyone who wants to borrow the tool is welcome to give me a call and stop by. It's about a 60 second operation to knock out all 4 tubes.
I did the "punch out" modification on a '78 Harley Sportster many, many years ago. The bike stayed quiet at idle but it certainly opened up the top end and it would shoot blue flames out the exhaust on decel at night time. It had a nice mellow bark on hard acceleration, too. It really helped that p.o.s. perform better but nothing ever helped it to stop or handle a corner.
Ever since owning the ST I've been thinking of doing the same mod, but I did not want to chance messing up my ST with negative results. Now I have done it, many thanks to Mondo for giving me his old stock cans to experiment with. So far, I've only put on 150-200 miles since the modded cans were installed but the fuel economy does seem to have improved according to the bike's computer. Note: my '07 had a heat shield on the left exhaust for the ABS brake lines, his cans did not have that same heat shield.
In order to punch these out to the maximum diameter without hurting the outlet tubes, I custom cut a punch out tool on the lathe within 0.015" of the tube's inner diameter and mounted that on the end of a 0.500" steel rod to hammer it home in 2 or 3 hits. It works great.
I have a sound meter so I took before and after mod readings with the bike in the same location at various rpms. The meter was set approx 12' behind the back of the ST (on center stand, bags & top box on) and approximately 3.75 feet high. The sound meter was set on slow response and varied on the A & C weighting options. The results are as follows:
idle 70 db 84 db stock
69 db 82 db punched out
4000 rpm 82 db 90 db stock
84 db 89 db punched out
6000 rpm 86 db 95 db stock
85 db 92 db punched out
It does not seem right that the end result was mostly quieter than stock. Perhaps the drop in pressure and minimized length of travel may have an effect on the output noise levels. The amount is negligible anyway. I checked the battery before and after taking readings and it was still good. The meter's position was not changed during any of the data collection. I believe the numbers to be valid.
I took the bike for a ride with the modded cans and I did not notice any sound difference at all except for some popping on downhill engine braking. The fuel economy meter showed an increase but the ride was too short to draw conclusions on that matter. The "seat of the pants" meter showed about the same but I rarely twist the throttle fully anyway. So far, I'm happy to keep this mod in effect.
Anyone who wants to borrow the tool is welcome to give me a call and stop by. It's about a 60 second operation to knock out all 4 tubes.
Rikj
Re: STock Exhaust Modifications.
RE the stock muffler mods. Had mine done recently. Removed the outer end cap and cut out the two small pipes right through the internal end plate and the three compartments, using a 30mm metal cutter attached to a long extension to the drill. Pressed out the holes in the external end cap to (32mm) to accommodate a 30mm pipe (external measurement) . These small pipes were only 30mm long as well and were stainless steel welded to the inner end plate. The external end cap was stainless welded on again, and the 30mm pipes only just protruded through the external end cap. The idea was to keep the look of the muffler as close as possible to original. You would need to look closely to notice the difference. It is noisier, (has a nice burble) but not uncomfortably so at the idle and up to about 40kmh. When you crank the throttle the noise is less than expected, and there is no drone in the helmet at any time. At speed, as the rider, you cannot hear the bike. Have received quite a few favourable comments on the sound, but more importantly, my fuel consumption has improved, and the bike is certainly more responsive. Took 4 hours and cost $250. Love the result. Regards Rikj (Australia)
RE the stock muffler mods. Had mine done recently. Removed the outer end cap and cut out the two small pipes right through the internal end plate and the three compartments, using a 30mm metal cutter attached to a long extension to the drill. Pressed out the holes in the external end cap to (32mm) to accommodate a 30mm pipe (external measurement) . These small pipes were only 30mm long as well and were stainless steel welded to the inner end plate. The external end cap was stainless welded on again, and the 30mm pipes only just protruded through the external end cap. The idea was to keep the look of the muffler as close as possible to original. You would need to look closely to notice the difference. It is noisier, (has a nice burble) but not uncomfortably so at the idle and up to about 40kmh. When you crank the throttle the noise is less than expected, and there is no drone in the helmet at any time. At speed, as the rider, you cannot hear the bike. Have received quite a few favourable comments on the sound, but more importantly, my fuel consumption has improved, and the bike is certainly more responsive. Took 4 hours and cost $250. Love the result. Regards Rikj (Australia)
mellow mark
Re: STock Exhaust Modifications.
My completely stock 06 is almost embarrassing - sometimes sounds like someone is
running a Brothers' sewing machine flat out. Butt - good mileage, great acceleration
good cornering - I just wear wear plugs!
My completely stock 06 is almost embarrassing - sometimes sounds like someone is
running a Brothers' sewing machine flat out. Butt - good mileage, great acceleration
good cornering - I just wear wear plugs!
- Joined
- Nov 20, 2005
- Messages
- 637
- Location
- Cedar City, Utah
- Bike
- 12/04/AZ05 ST 1300s
- 2026 Miles
- 000216
So, does anyone have any idea how many miles we can get out of a set of mufflers before the cats plug up?
Smallville
Scott
So, does anyone have any idea how many miles we can get out of a set of mufflers before the cats plug up?
I bet under normal conditions, they would out last the rest of the bike.
I have finished the 3/4 punch out in the mufflers I am getting a rather non obnoxious popping under throttle off and a increase in fuel consumption ranging from 19km to 27km per litre for 100km 27km per litre gives me around 700km per tank although not tested yet.. but I did do a half tank test today and received 260km before half a tank was used.. used to be just on 200km for half a tank with about 450km empty with 4 litres in the tank at that point.. engine is more responsive and i do not get the jerk at low throttle any more. In part it is way more driveable and reves a lit easier.. I'm happy with the results even if the consumption was lower the bike certainly runs a lot better and is way more responsive so I'd still be happy. Tone wise is the only downfall it sounds like it farted.. but that's the st engine all over..
Last edited:
OP
OP
100MPG
Convert
From the dead. (This thread, not me)
The pipes are for sale. 200 + shipping.
The pipes are for sale. 200 + shipping.