Aluminum conducts heat, so it's really not helping at all. A Phenolic or composite spacer would reduce heat some, but even that may not solve the problem.
Ok but driving this almost every day for a year no problems tell last week with starting an today start up fine all day so I'm confused help
Well it sounds like a flooding issue, and since it never had that problem before, it's probably not caused by heat (although heat will make the problem worse). I'd refer back to the suggestion that you may have a needle/seat not completely closing off the inlet of fuel. I'd probably go through the carb before doing anything else. Does the carb have a choke? And if so, is it fully open when the engine is hot?
Do you buy your fuel in at the same place all the time??? Same octane rating each time??? It could be a fuel formulation/octane issue as well. But... Most likely as stated above. Check your float setting cold and hot before you start tearing things apart. Allways do the diagnostics that dont cost you money/disassembly before tearing into stuff. You can stop alot of a heat soak issue by, blocking off the heat riser passages in the heads that feed hot air to the bottom of the intake under the carb.
Crazy Larry is correct. An aluminum spacer will do next to nothing to insulate the carb. Try a composite, it could be an inexpensive remedy.
I didn't mean to say it would cure a hard starting problem. I just meant that it was a good write up on how to use a vacuum gauge.
