Thursday, October 20, 2016
Nothing to See Here
Victoria has committed to spending at least four hours a week working on her convertible during the Fall and Winter, so the first step was dealing with Luna’s home. Wednesday evening she and I spent an hour or so putting a new cover on the portable garage. It was nice to rip the nasty, worn out one off and expose Luna in all her ignored glory. She’s in need of a good cleaning since the resident cats like to nap on her. The plan is to get her running first so we can drive her between the portable and permanent garages allowing us to do the work in heated comfort but not tying up the heated area when she’s not available. In order to make that happen, I first need to end the carburetor adventure I’ve been on.
That started last night when I successfully got the second modified carb functioning properly on Glinda’s engine, but not without some shenanigans. To catch up: a few weeks back I used the newly modified bases (relocated jets) and tops (vents tubes added) and put together two racing carburetors with GUPs and new gaskets. I bolted them on to Glinda and the left carb flooded – stuck float. I pulled the top, checked the float (it was fine) and needle-and-set (also fine), put it all back together, and re-started the engine. This time there was no flooding, but the left side of the engine was not working right. I swapped back on the previous carb and set the racing carb to the side. Fast forward to last night when I tore down the misbehaving racing carb and blew out all the passages before putting everything back together with new gaskets and installed it onto Glinda’s engine. This time the engine fired up without any gas geysers. I blipped the throttle a few times while looking down the throat of the left carb to see if there was a squirt from the accelerator pump, but there didn't appear to be any. I shut off the engine and tried to blip the throttle again only further this time, but the throttle wouldn’t go past halfway. Irr. I investigated and discovered the linkage rod was hanging up on the tip of the tab that rides on the fast idle cam (see the surfaces indicated by the purple arrows in the above photo; the upper surface is the tab while the lower one is the surface the throttle rod sits against). Off came the carb so I could bend the tab back into place. Once I was convinced it was out of the way, I reinstalled the carb and made sure I could get full throttle travel. I also verified that the accelerator pump was squirting as it should. With those two hurdles crossed, I re-started the engine and happily felt that the engine was finally behaving properly. This was confirmed by both chokes opening simultaneously. I shut off the engine and hooked up the clear tubing to each carb’s vacuum port. With the engine running again, it only took a couple turns of the left carb’s idle speed screw to stop the bubbles from moving in the tube.
By that point, bedtime was fast approaching so I put away the tools, reinstalled the air cleaner, and called it a day.