[TR] TR6 no start

[Dave]

 Could it be too much fuel?  Dirt in the float valve can keep the valve open where fuel will overflow into the carburettor throat and flooding out the engine.  Once that happens residual fuel in the intake will be enough to almost run the engine with no contribution from the carb.

Or, since you are in the Hot-lanta neighborhood it could be vapor lock.

 

Dave Massey


 

 

-----Original Message-----
From: Jeff Scarbrough <fishplate at gmail.com>
To: Triumphs (triumphs at autox.team.net) <triumphs at autox.team.net>
Sent: Sat, Jul 11, 2015 7:31 pm
Subject: [TR] TR6 no start


Well, this shouldn't be this difficult...

Last Sunday, I went to drive my 75
TR6.  Last time driven was about
three weeks prior.  Last tank of gas was
ethanol-free, purchased on 22
May.  Currently about a half-tank left.

It
started perfectly normally, and drove out just fine.  it's about
3/4 of a mile
to the main road, and over that distance it began to
sputter a bit, then more
and more, until the point that I was hesitant
to pull out onto the main road. 
Good thing, as it finally sputtered
completely to a halt.  Just before it quit,
it made a huge bang out
the exhaust pipe, accompanied by a cloud of black
smoke.

So...

I have verified that the fuel is being delivered, the fuel
itself does
not appear to have any water or other adulterants.

I have
verified that there is a spark

I have verified that the condenser is good,
the points open and close,
and the dwell is approximately 38 degrees.

I have
verified that the piston is at or near TDC when the pointer on
the crankshaft
indicates same, and the rotor is at or near the correct
position.

Static
timing is 4 degrees BTDC.

And yet, I can get nothing but the faintest hint of
firing.  Ether
doesn't help.  Today I pulled the front carb, verified that it
had
fuel in it that wasn't watered, and that the float valve
worked..

Interestingly, when I replaced the carb, it tried to start with
an
empty bowl.  But as it filled, it got more reluctant to start.  Spins
like
crazy, but no pop.

So, a mystery.  Am I on the verge of inventing the
fuelless
automobile, or is it something simple?

(I should add that it's
hotter than the hubs of Hell, here, and my
brain may be overheated...)

Jeff
Scarbrough
Corrosion Acres, Ga.

    

 
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