[TR] Travel and tuning question

[dave northrup]

What I did vs what I should have done.

We drove from Dallas (sea level) to Reno (about 5000 ft) and did nothing.  The car drove ok.  once in Reno we leaned it out quite a bit and it ran much better.  Back through Taos and return to Dallas did not do anything.  Car still runs and drives but I really should get out there and do a tune up.

Here is how to tell:  hold the piston up just a smidge with a flat bladed screwdriver.

RPM increase means the carb is adjusted too rich.  RPM drop means the carb is adjusted too lean.  RPM stumble, but returning close to normal or no change means the mixture is about right.

-----Original Message-----
From: Triumphs <triumphs-bounces at autox.team.net> On Behalf Of Dave Connitt
Sent: Friday, December 2, 2022 9:50 AM
To: Triumphs <triumphs at autox.team.net>
Subject: [TR] Travel and tuning question

Hi all,
This coming summer my wife and I are planning a fairly long trip in my TR4A  leaving from Cincinnati, Ohio (altitude approximately 500’). Our first destination is going to be Colorado Springs, Co. to drive up Pikes Peak (altitude approximately 14,115’). Then north to Mt. Rushmore (altitude approximately 5,700’), then north to drive through Yellowstone national park (altitude approximately 9,200’). That’s going to be quite a swing in altitude and I am wondering if I will have to occasionally tune the SU HS-6 carbs? Has anyone on the list done a similar drive? If so, how did your Triumph run and what did you have to adjust?
Thanks in advance!
Dave Connitt
‘67 TR4A-IRS
DavesTR4A.com

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