[Tigers] Vapor lock/fuel percolation

[awtiger at cox.net]

Ron:

Thanks for the suggestion.  I'll double-check the advance on the timing before we get it out to drive tomorrow.  I've already been through the fuel system and have determined that I have a good pump, a good fuel filter and nothing in the tanks but gas.  That is why I suspected that, if it was still a fuel problem, it had to be heat-related. 

Thanks and I'll keep everybody posted as to what we find,
Andy

----  Ron Fraser <rfraser at bluefrog.com> wrote: 
> Andy
> 	Any time you think you have a carb problem the 1st thing to check is
> your timing and advance curve and make sure the timing always comes back to
> the initial timing point.  I have seen this advice in a few articles that
> most carb problems are really ignition and timing problems and I now agree
> with that statement.
> 
> 	I have been working on some similar problems with my Tiger, low rpm
> feels wrong, lethargic and wanted to stall until I step on it then it goes.
> My problem was the after market fuel pump gave up after 20 yrs.  Fortunately
> it totally died in my garage and not out on the road.  I suspected the carb
> idle circuit and the main jet where also contaminated.  I found many small
> particles of whatever in the carb.  I had to remove and clean the 2bbl carb
> plus I replaced the fuel filter.  I tapped on the removed fuel filter, more
> particles fell out.
>    
> 	The engine now feels and sounds better at low rpm and idle but it
> still needs more work.   I need to tune the carb and engine to run better on
> the 10% alcohol fuel we are now forced to buy here in NY State.
> 
> 	Alcohol can be good and bad in older cars.  Good at cleaning
> deposits out of the fuel system and give a bit of an octane boost; bad that
> it can also dissolve rubber parts, gaskets and some older fuel filters, so
> I've read.  The point here is to be aware of some of these problems with
> alcohol fuels.
> 
> Good luck with your situation.   It most likely is a combination of several
> small problems that you need to step through which you are doing.    Assume
> nothing and take nothing for granted until you find the real source of the
> problem.
> 
> Ron Fraser