My fist round of carb changes:- Changed the pilot jet from the original 45 to a 50
- Changed the main jet from the original 145 to a 150
- Replaced the white spacer with 2 brass washers which equals 1/2 the white spacer thickness. ( I had to file down the outside diameter of the brass washers a little bit to the same diameter as the white spacer)
- I checked the float height and found it to be a bit low at 25.6mm or 1.01" (spec is 27 to 29mm or 1.06" to 1.14")
First round results were:- I think the main jet change to a 150 is probably perfect. Good steady power on the throttle. No surging and no harder pull when I roll off the throttle.
- I achieved my best idle at 1 3/4 turns out on the idle mixture.
- I'm still getting a lot of popping when I roll off the throttle hard. I don't mind a bit of popping (actually kind of like it
) but the frequent backfire is annoying. There has got to be a further alteration to eliminate the backfire. I tried turning the idle mixture out another 1/2 turn to 2 1/4 turns. Even though it smelled rich it made no difference in the popping or backfire.
I'm thinking maybe going down to no spacer or 1/4 spacer. Or maybe go to a 52.5 or 55 pilot jet (which I have both)
What would be your next moves???
Thanks a bunch for anyone's input.