Sounds familiar. I had the same plug fouling issue - I checked the floats,
cleaned the float valves, reset the timing, checked the mixture, full tune
up (points, condenser - don't forget that - cap, rotor, wires, plugs, coil),
added a heat shield, replaced the fuel filter, put an electric fuel pump
in-line. Finally pulled the carbs and sent them off to be rebuilt.
I tried the normal test of spraying starter fluid around the carburetor
shafts, but got no increase in rpms. However there was some wiggle in the
shaft so I figured it had to be done anyway. Butterflys were replaced in the
rebuild, so that could have been an issue also.
The carbs are on their way back to me so I don't know for sure that will
cure the problem, but I am hopeful.
Bob
-----Original Message-----
From: Triumphs [mailto:triumphs-bounces@autox.team.net] On Behalf Of Brian
Thomas
Sent: Friday, August 15, 2014 1:28 PM
To: triumphs@autox.team.net
Subject: Re: [TR] TR4A Sputtering
Thanks to all who have replied in regards to my "sputtering" problem. Lots
of good ideas and I'll be working through the list.
This afternoon, I pulled the plugs and the front two were a nice grey/tan
colour while the back two were quite black. Suspect the rear carb (SU)
needs to be leaned out a little.
Another problem I'm having is that once the car gets up to operating
temperature, the idle will not return to 800 rpm unless the gas pedal is
goosed. I've been told my throttle shafts are worn and the carbs are likely
sucking air around them. Is this the likely cause? The linkage is in good
shape and moves freely.
... and while I've got your ears, a couple of parts I've replaced on the 4
have not lasted well - I wonder if others have experienced the same and how
they've solved?
1. Radiator air deflector - this fibreboard product does not like to get wet
(as it does when driving in the rain). The lip on the radiator side does
not appear to be rigid enough to keep the top surface in shape and it sags
down 3 or 4 inches. I'm on my second one at present. I've tried spray
painting both sides with enamel (to waterproof it) but this has not been
overly successful.
2. Turn Signal Switch - I'm on the 3rd one of these. Problem is the return
stops working (and of course I drive on and on with the signal flashing) - I
can just hear the comments - silly old fart ...
Any ideas or suggestions greatly appreciated.
Cheers,
Brian
_______________________________________________________________________
Brian Thomas E-mail: ThomasB@QueensU.Ca
92 Wyona Lane, R R 1 Phone: 613-385-1947
Wolfe Island, Ontario Toys: 54 TR2, 56 TR3, 67 TR4A, 01 XKR,
75 John Deere 920
CANADA K0H 2Y0
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