Originally Posted by 92Fatty
I used a 7/64 drill bit to enlarge the hole and used 2000 grit sand paper and smoothed it out. Mine has excellent throttle response. I'm surprised at 50 plus mpg around town with the 48 slowjet, must be the bagger gearing. My 92 fatboy 80" running 45/175 with a sportster needle pulls mid 40's. Just curious what needle are you running? Thanks Kent
Apologies for not getting back to this sooner...
I was running the needle that came with the used CV off a 95 Softtail. Jetted 45/165 with an N86E (leanest) I went to the 175 first, then added the 48. In all honesty, I was fooling myself into thinking that was good. The 48 was rich (but trimmed with the screw) and 175 was barely adequate at high speed.
So I did drill the spare slide and changed nothing else except for a mild chamfer job on the front edge of the slide. OH BOY! Talk about throttle response - I had no idea it had been so dogish for so long. Then I added a short spring (out of 44MM TC carb) and it ruined it. Way too much lift/air and all the jetting changes thereafter produced no satisfaction.
In the interim, I stumbled acrosss an HD Thunderslide Kit for cheap, complete with a used diaphragm. Actually, the slide/diaphram were the only used parts in the kit and it was complete. I installed all that and particularly was happy to get a new accelerator nozzle/check valve, as mine had been slobering too long.
So I ended up with 45/185, needle clip @ 3 and 2.5 on the mixture. I rode a good bit Sunday at 70 degrees and later at 3000 feet and 65 degrees. At interstate speeds (over 65 - under 75) I got 45.9 and at low speed 45 - 55mph some hills, and no traffic and got 55mpg. Bear in mind, that was extremely
conservative on acceleration both conditions.
I ride more cooler weather than extremely hot, but think I still have a bit of tweaking yet to be tried because the major increase in throttle response seems to fade a slightly in higher air temps. But for now, I'm totally good with it!
And, in all fairness, I believe if I'd gone back with a stock spring and the originally drilled slide, certainly a richer needle and played with shims, I am confident that
combination would have given me similar results concerning response and mileage. I may try it sometime later....