Can't say that I've had this problem, but in THEORY, popping back thru the carby
sounds like the engine is firing to soon (ie when inlet valve not fully closed).
Under load, that sounds like too much vacuum advance.
(The only time I've had inability to make power under load, it was bad plug
leads -
however it wasn't popping back thru carb.)
Vic, waiting for another beautiful theory to be destroyed by an ugly fact.
BPARLEE wrote:
> Got a problem I need some help on.
> I restored my Tiger about 5 years ago and it has run great for about 8K
> miles now every time I ask the original 260 to make more then a little power
> it pops back through the carb and in turn - loses power till I back off. It
> idles fine with no strange noises and I can rev it up with no problems, as
> long as there is no load. I have Stock everything except the coil which I
> replaced in trying to solve this problem it is a off the self coil spec'd
> for an early Mustang.
> I have;
> Rebuilt the carb
> Checked timing
> Checked the vacuum advance
> Took apart and cleaned the distributor ( made sure the advance
>mechanisms
> were free and operating.
> Changed the coil, cap, rotor, points and condenser
> Checked over the wiring
> + all the normal stuff.
>
> I have not; because they are hard to do with no engine compartment
>room
> Done a compression test
> Changed the plugs (Only 2k miles on them and the ones I took out
>looked
> perfect and that was a pain)
>
> I'm stumped and I don't want to go in to the engine unless that is the
> problem.
>
> What could be amiss that would make it pop through the carb only under load
> that I missed?
> What would make it pop through the carb only under load in general?
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