Join Date: Mar 2019
Model: Shadow Ace Deluxe VT750CDD
Mikuni HSR42 single manifold update
Reporting from out here on the perimeter, on the edge, but ain't fell off...yet. Well, my bike is like a new bike, runs beautifully. Got a little over 200 miles on this setup. Plugs look good, EGT balanced at ~275 degrees (after long ride, stopped and idling). Starting is just pull the choke and it starts right up. Idles strong and consistent, thump, thump, thump...The old carbs I had to blip the throttle 3 times pull the choke and MAYBE it would start. The 42 has an accelerator pump so blipping the throttle would only flood it. On the 42, I got the knob style choke it's a 2 position detent, I like it best. It came with the long choke cable but seemed mushy, squishy had no detents. The old carbs would pop on deceleration, I tried everything to fix that to no avail, I used to pull the clutch in and coast so I didn't pop and sputter. No need to do that now. Plenty of power although that was not my goal, ease of maintenance was. Below is the photo of the 6th prototype, final one. Looks easy doesn't it ? I probaly have 4 months of off and on work on this. It ain't easy, a lot of tuning the manifold had to be done. Dealing with 2 variables, unknown manifold and unknown carb was a giant hairball. I'm retired so I have plenty of time to deal with it. I would like to emphasize again, I DO NOT RECOMMEND ANYONE ELSE DO THIS. Newer bikes have safety fuel cutoffs at the petcock and the fuel pump, this bike does not. This carb is gravity fed, I just don't need no stinkin' fuel pump. I'm very happy with and glad I did this, although along the way at times I had my doubts, persistence prevailed.
Onward, through the fog...
My PC has gotten real slow lately, a classic symptom of Sh!t Buffer Overflow, once your sh!t buffer overflows, it's over man, especially if there is a fan nearby. -- Mother
Unwritten rules and regulations are not worth the paper they're not written on. -- Mother