Gentlemen,
I've recently fitted a new TM32 flatslide, with Ace Air Canister and Alloy Manifold. (Thanks Tom, beautiful work!). It's jetted properly and running great. ('99 500ks)
Although, here's my issue. I've replaced the fuel line to the carb with 1/4" clear tube. Also placed in-line filter. The petcock nipple is smaller, probably 3/16". So, from the petcock to the filter, I placed smaller fuel line and worked it onto the 1/4" filter "in" side....then the 1/4 from filter to carb. (Proper size for the TM32).
I have not had any issues with fuel starvation, but have noticed (since fuel line is clear) that the 1/4" line does NOT stay full of fuel. In fact, it has gotten to the point where there is NO visible fuel in the line, but keeps running...obviously the bowl stayed full. Once parked, the line will partially fill back up again. I'm assuming that is due to the smaller sized petcock. I've read the issues of different sized petcock threads throughout the years of RE models and difficult to find the proper one to thread into the tank. Yes, it's threaded not the 2-bolt flange type. Also has what appears to be a step-down threaded adapter.
Question is....Is this most likely the problem, with the smaller petcock? OR, could it be due to the fact the fuel line has to run up/over the head steady, resulting in not having a direct gravity flow to the carb fuel inlet? I'm guessing it may be a combo of both??
As always, your advise is well appreciated.
Tim