I'm hoping to get some suggestions as to which air filter, intake manifold and air intake tube I should be using. My present configuration doesn't seem to work right. Some background:
I finally started the engine for my '83 SP project. Weirdly, from cold it started without the enricher more easily than with it. Took a while for the first start but ran ok once started, for about three minutes or so. Shut it off but, now warm it would not start. I think I know why. The K& N pods slide on to a very long air intake tube attached to the PHF30 carbs:
Also, notice that the bike came with the less-curved-than-stock Delrin intake manifolds, so the left filter touches the frame: (the stock side panel doesn't fit.)
I've placed the right filter above the intake tube so you can see how far the tube intrudes inside the filter:temporary image hosting
My theory is that the intake tube is partially blocking the airflow through these tiny pods, resulting in a rich mixture. And maybe these pods are just too small? To prove it, I started the bike a couple of hours later without filters (Engine was cold) and this time it started quickly with the enricher on. Once warmed up, the engine started easily without the enricher. Also seemed to rev up more quickly when twisting the throttle.
All these parts came with the bike
as I purchased it. But the frame was crabbed and the carbs were off when I bought it, so I don't know if it was actually run in this configuration. From my experience today, it doesn't seem likely.
I don't think I can fit a larger K&N (The oval one) with this configuration. It doesn't look like Delrin type manifolds with a sharper curve are available. (But please let know if you've found one.)
Ideally, I would like a solution that would allow me to A: use bigger air filters (Or a large shared one.) and B: not have to cut my left side panel to fit. I want to keep my just rebuilt PHF30's.