Triumphrat

reloader/parts · 08-08-2009, 01:19 PM

I have an issue with fouling plugs. I had this issue once before on a 65 TR6 and the answer was a top end rebuild. This is my first time, believe it or not, working on a T140V. There is a new charged battery, new Amals, and a new Pazon. She runs fine, starts on the 1st kick, but after 30 min...chug pop pop bang! I also noticed at night, with the headlight on, it starts poppin sooner until the light is brown and she wond start again. Iv checked the battery when running with the headlight and the break light on "stop" and there is no drastic drop in voltage. Im running B7ES as I always have in my 650's.
Did I forget something?! Is there somewhere Im NOT looking?!

thirdbike · 08-08-2009, 10:49 PM

Its either one or the other: Your headlight can't go"brown" and at the same time your voltage not "dropping."
You can confirm that your headlight is dimming by checking the voltage at the headlight. If this voltage variance does not exist at the battery then you have a wiring problem which I suspect is also robbing your Pazon.

reloader/parts · 08-09-2009, 12:38 AM

Duh! At the headlamp! I know that, why didnt I do that.

So bush league. I think I got so bent outta shape I just stayed stuck on stupid.
I betcha thats where my real problem lies. 1st thing after coffee tomorrow Im going right back to work and tearin that headlight bucket apart. Thanks 3rd! Good lookin out!

GrandPaulZ · 08-09-2009, 12:34 PM

Electronic ignitions are far more sensitive to battery voltage than points, so you've got to make sure to rule out that variable. If you have a modern headlight bulb, it's likely that it draws more amps than the original.

3-phase alternators are one of the best solutions to REDUCING these issues (they still don't build higher amps till low-mid revs).

I suggest you run Champion N5C plugs rather than NGKs, they have better longevity in marginal conditions.

Also, the more around-town cruising you do, the more the drain on your battery, ESPECIALLY if you run with headlights on all the time.

reloader/parts · 08-09-2009, 01:20 PM

I am aware of the battery to ignition issues. I was thinking the new headlamp was pulling alot of power, but not that much to steal the spark. However this is looking to be the culprit. The bulb and the crap switch in the bucket. Both are being relocated to a shelf in the shop.
Thanks for the help fellas!

GrandPaulZ · 08-09-2009, 02:43 PM

As bad as original Lucas and cheap replacement electrical parts (switches) can be, and as much as modern bulbs can draw excessive amps, LOOSE, DIRTY and CORRODED CONNECTIONS (especially grounding) cause more problems than anything else.