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Gday ive got a 2005 softail ive got s/e 11 pipes breather kit ignition module, coil ive recently added the mikuni but cant get the tuning spot on its got a 160 main 25 slow and 70 nozzle it really seams to bog dowwn either getting to much fuel or not enough when you open it up on the highway around 70 miles
the plugs are sligtly sooty(sign of richness)
and the other day when i got home and turned off the engine there was engine run on (sign of leanness)so im a bit baffles any help would be appreciated
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try a 155 main and see what it dose, that 42 is alittle more at home on a 95 ci.
I also bought a tuning kit from Head-Quarters for the midrange fatness that is hard to fix.
__________________
95 Sport/touring HQ big bore kit
.575 Firestorm cams
D&D fat cat
Mikuni 42 mm
magnecor spark cables
Here is a link to an article written by Joe Minton. He wrote the book on the HSR carb... literally. He wrote the tuning guide (which is available in PDF format on Mikuni's website.)
He states that the carbs come a bit rich. He recommends a 17.5 idle jet, a #98 needle (which is slightly leaner than the 97), and a #50 accelerator pump. He says the stock main jet is usually correct (160 I believe?). There is a kit that can be purchased from Fox Distrubuting. I believe the number is in the article. I just ordered the kit from them a while back and they were really great to work with. The person I spoke to really understood the Mik carb as well.
try a 155 main and see what it dose, that 42 is alittle more at home on a 95 ci.
I also bought a tuning kit from Head-Quarters for the midrange fatness that is hard to fix.
Here is a link to an article written by Joe Minton. He wrote the book on the HSR carb... literally. He wrote the tuning guide (which is available in PDF format on Mikuni's website.)
He states that the carbs come a bit rich. He recommends a 17.5 idle jet, a #98 needle (which is slightly leaner than the 97), and a #50 accelerator pump. He says the stock main jet is usually correct (160 I believe?). There is a kit that can be purchased from Fox Distrubuting. I believe the number is in the article. I just ordered the kit from them a while back and they were really great to work with. The person I spoke to really understood the Mik carb as well.
For those that are reading this artical, keep in mind that the writer dosnt specify which size engine that his is tuning for with his recomdations, (im assuming its a stock 80 CI evo).
His recomedation wont work for a bike with a big bore, cams and big exhausts, I have tried!!!
A # 20 pilot was just too small on my 95, (i didnt even try the 17.5 they recomend) hard starting and rough idle.
around LA most bikes with aftermarket pipes are using the #27 pilot.
The fatter needel is doable, but the HQ part works better,
I prefer to keep the stock #70 squirter and raise or lower the main jet size to do the fine tuning.
Trying to run the smaller squirters gave me masive pining on hot days when rolling on the throttle. not to mention the lack of power on acceloration.
I almost forgot to add the best advice ive ever gotten about tuning: regardless of what anyone says, just give the bike what it wants!!!
__________________
95 Sport/touring HQ big bore kit
.575 Firestorm cams
D&D fat cat
Mikuni 42 mm
magnecor spark cables
Last edited by new_mentor70; 01-15-2009 at 11:55 AM.
I'm going to read the article, but I wanted to add to this thread since there are some experienced tuners here.
I have a '96 FXDWG with an Andrews EV3 or EV27 (can't remember now), V&H straight shot pipes, the SE air cleaner, Dyna 2000 igntion (single fire) and an HSR42. All of this stuff has been on this bike for 90k miles, 1997 is when I did the work. I had the cylinders refreshed at about 60k miles, SE cast pistons, nothing radical.
The bike is running rough and idling poorly. I replaced the intake manifold gaskets last year, didn't seem to help. I can adjust the idle speed screw so it won't stall, but after riding it for 45 mins or so, when I stop at a light she's racing. I readjust the idle speed and she's OK for the rest of the day. Next day, hard start unless I tighten the idle speed screw in a couple turns. Then the whole process starts again. Seems to me I should not have to adjust the idle speed so much.
I'm certain the carb has the jets it came with and I know I haven't done anything to them in all these years either. Recently mentioned problem to a shop when I brought it in for a timing check and valve adjust. They told me they leaned it out some. The bike is running the same, not that great IMO. She was Cadillac smooth a couple years ago, but this idle speed thing has been going on for some time.
If it matters, I'm in California, so no high elevation stuff to deal with. I run 91 octane fuel.
Maybe my story will spark a thought from the experienced users here. I'd appreciate any recommendations.
Gday ive got a 2005 softail ive got s/e 11 pipes breather kit ignition module, coil ive recently added the mikuni but cant get the tuning spot on its got a 160 main 25 slow and 70 nozzle it really seams to bog dowwn either getting to much fuel or not enough when you open it up on the highway around 70 miles
the plugs are sligtly sooty(sign of richness)
and the other day when i got home and turned off the engine there was engine run on (sign of leanness)so im a bit baffles any help would be appreciated
If after you read the manual and still have questions you can call mikuni direct and a tech will answer any questions you have.
I'm going to read the article, but I wanted to add to this thread since there are some experienced tuners here.
I have a '96 FXDWG with an Andrews EV3 or EV27 (can't remember now), V&H straight shot pipes, the SE air cleaner, Dyna 2000 igntion (single fire) and an HSR42. All of this stuff has been on this bike for 90k miles, 1997 is when I did the work. I had the cylinders refreshed at about 60k miles, SE cast pistons, nothing radical.
The bike is running rough and idling poorly. I replaced the intake manifold gaskets last year, didn't seem to help. I can adjust the idle speed screw so it won't stall, but after riding it for 45 mins or so, when I stop at a light she's racing. I readjust the idle speed and she's OK for the rest of the day. Next day, hard start unless I tighten the idle speed screw in a couple turns. Then the whole process starts again. Seems to me I should not have to adjust the idle speed so much.
I'm certain the carb has the jets it came with and I know I haven't done anything to them in all these years either. Recently mentioned problem to a shop when I brought it in for a timing check and valve adjust. They told me they leaned it out some. The bike is running the same, not that great IMO. She was Cadillac smooth a couple years ago, but this idle speed thing has been going on for some time.
If it matters, I'm in California, so no high elevation stuff to deal with. I run 91 octane fuel.
Maybe my story will spark a thought from the experienced users here. I'd appreciate any recommendations.
Thanks in advance!
Jeff
Sounds like you have a vacuum leak somewhere. But I would first pull the carb and give it a complete cleaning inside and out. You may want to replace all the jets as well. If you can't do this yourself send it out to a quality rebuilder. Then see what happens.
__________________ 06 FXDLI
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Mikuni hsr 42 tuning
06 FXDLI 
