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1985 VT500C won't start when hot

8846 Views 48 Replies 10 Participants Last post by  David C.
I bought this bike back in Feb. of this year. It had a bad rod knock, so we tore it down and replaced the crankshaft, push rods, and push rod bearings. It is running fine. I can start it, drive it wherever I want to go, but if it's hot, it does not want to re-start. After a bunch of reading here, I decided that the fuel system might be creating a vacuum, so I started poking around. I noticed that the fuel shutoff valve has this vacuum line;



The new fuel shutoff valves do not have the vacuum line;

Honda Shadow Aero Sabre Spirit 1100 Ace Tourer Gas Fuel Tank Petcock Valve | eBay

Does anyone have experience with this problem, or should I be checking another part of the fuel system?
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Open your fuel cap and try it again. Might not be a hot issue at all, but a plugged vent.
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