Dyna, Harley Davidson

If by great sound you mean loud, your in trouble. loud doesn't equal performance. The DYNA muffler is slightly louder, has a deeper tone and less back pressure and is lighter than stock. It 's also easier to tune the carb to, which is why a lot of us use it. It also allows the  exhaust wave to expand at the end of the exhaust header (wave tuning) something that your present muffler doesn't ,which is why your bike doesn't run at higher rpms. Any muffler has to be larger in diameter than the header pipe to effect this .

Alright here's the update......... pulled carb and cleaned a again, checked jets running 55 pilot and 150 main. Adjusted the needle to the spacer mod position, and took off the air filter and put electrical tape over 2/3rd of the opening on my intake tube ( running about 10 inches of high temp silicone tube from filter to carb? Anddddddd she pulls i0 lime friggin nothing. Passes cars Ricky tick and man I'm excited to ride. Still have the shorty exhuast and may need to fine tune just a bit more. Start rolli g throttle and it revs up a bit then come s back down could be clutches too i guess. Thank you all for wvwry idea and piece of knowledge.... time to fab a new filter set up

Changing your air filter will do nothing, What is the spacer mod position?Placing tape over the inlet hose cut air flow into the carb ,which increased the vacuum in the carb body pulling more fuel from the jets( your jetting is still to lean!) You need to be running 55pilot,2 #4 washers on the needle, and a 152.5 or 155main.

Shrulk wrote on 03/02/18 at 18:11:19:


The engine/carb doesn't need a restriction on the inlet side of the carb - what you have done may be helping to mask a problem that is caused by something else.

I'm having very similar symptoms with a large cone air filter. It runs and idles just fine up until the point where it should be opening up the slide, and spits and sputters. I borrowed your idea of forcing restriction and taped up about 3/4 of the filter element starting at the end working back toward the opening. 1 wrap of fuel width duct tape helped, another overlapping wrap closing 3/4 of the filter off seems to have cured the symptom.

I'm running a 55 pilot jet and a 155 main. 2 spacer washers on the slide needle. Rotella T4.

Christof13T wrote on 03/06/18 at 04:33:21:



Hopefully that is the fix but sounds like we have other issues. I put some theory into my idea and to me it makes sense but i hope im right and not sterring you down the wrong path.

I'll throw the 155 main jet in it and try it. Thx. It's not turning blues it's turning goodish tones so I didn't know if that meant it was rich or about normal.