![]() When I think of all the gasoline I’ve wasted over the years because of the default Harley Davidson common knowledge to make it run so rich the tailpipes turn black inside… It makes me sad… Should be looking at around 42/45 mpg with good gas. That’s with the crappy “winter blend” of gas. Kinda hard to maintain 65 mph because the slightest twist of the throttle had me at 75+. Actually sounded better with no loss in acceleration. Took the Dyna out on Christmas day for a long ride. Decided to drop the needle down 1 notch in my quest for better mpg. Joe Minton, THANK YOU AGAIN!!!!! Your recommendations gave me 37.2 mpg and no loss of power. I’ll check back and give out my mpg numbers later. Feels like the speedo needle is attached to the throttle, give it a 1/4 twist and needle jumps up in unison with throttle. 17.5 pilot, 50 nozzle, nozzle squirts right off idle, 97 needle, middle clip was perfect. Runs like a Screaming Banshee!!! Following you Gas Mileage suggestion, all I can say is WOW. Earlier today, I installed a Mikuni HSR 42 on my 07 105″ 10.1:1 CR pistons, cammed Dyna. It’s hard to believe it can run this good, and get better fuel economy, to boot. My face (I think my wife heard a happy expletive or two)!Īnyway, thank you for this info. Responsive, and powerful, that immediately a grin formed on The acceleration from idle (Once tuned right) was so smooth, ![]() Today, and I could hardly believe what we were experiencing! Information on getting my old Evo (’97 Dyna FXDS-CONV) I must say, “Thank you very much”, for your generous To “Joe Minton Mikuni HSR42 setup/tuning recommendations” You can skip to the end and leave a response. You can follow any responses to this entry through the On Sunday, May 6th, 2018 at 7:01 am and is filed under General. Either race the thing or install a more appropriate cam for street use. No Mikuni or any other carburetor can fix this. Big cams, those with intake-closing angles of close to 50 degrees ATDC, aren’t going to run well below 4,000 rpm. Nothing, not this kit, not this carburetor, nor any carburetor, is going to make an engine suffering with open straight pipes run well.ģ. The original 97 needle should fix this.Ģ. Engines with high cranking pressures (high compression) may detonate at low rpm when accelerating. Midrange throttle response is greatly improved and the engine is much more pleasant to use. Don’t be surprised if you record 48-to-49 mpg at 65 mph. Fuel mileage increases, sometimes dramatically. ![]() The engine is more responsive, cleaner and “happier” sounding because of the leaner mixtures in the 10-to-25- percent throttle range, where we do most of our riding.ģ. This is because the idle jet is more correct and the pump delivers fuel sooner but at a lower rate than stock.Ģ. Performance just off-idle is cleaner and more immediate. Fit the leaner needle with the clip in the middle notch.ġ. Fit the smaller idle jet and adjust the mixture screw for best idle.ģ. Adjust the end point for maximum travel.Ģ. Adjust the accelerator starting point so that the pump starts working immediately. The kits come with simple installation and tuning instructions.Īdjustments (See The Manual For Details):ġ. The kit is called the Mikuni Mileage Kit and there are separate kits for the HSR42 and 45 carburetors because the needles are different. These parts are available individually or in kit form from Fox Distributing in St. The main jet is whatever it needs to be and the stock one is generally correct.50 accelerator pump nozzle way down from the stock 80.17.5 idle jet, leaner than the stock 25 or 20.They report that throttle response is improved, fuel mileage is better, and their engines sound and seem “happier.” The changes I recommend include accelerator nozzle size and adjustments, idle jet size, and needle size. Many hundreds of Harley owners have adopted my recommendations and have gotten excellent results. By properly tuned I mean that the engine is sound, there are no long straight pipes, drag-race cams, or stylish air cleaners that don’t flow much air. I have developed a set of jets and adjustments for the HSR42 and 45 that work better on most properly tuned engines. I have no complaint about the stock tuning, except for the accelerator-pump settings, which I am convinced are just plain wrong. However, the stock settings are fail-safes and are on the fuel rich side of ideal. Tens of thousands have been sold with very few complaints about how well they work. Mikuni’s default jetting and adjustments cover most engine setups, as they should. ![]() Our testing shows that the HSR48 only adds 2 or 3 top-end horsepower to an already powerful (120-plus horsepower) engines.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |