Fast running

[David M]

Hi All. New member and first post!! Bought my '74 mk2 earlier this year and hope to meet some of you at some stage at a meet. Been running great but today began to run fast (12-1500 rpm) once warmed up. Will try it tomorrow to see if it's better cold but wondered if anyone had any suggestions as to the possible cause before I blindly investigate those tricky carbs?? Thanks in advance. Dave.

[richard1705]

sticking choke cable maybe need greasing
richard

[jcslocum]

Look for loose oe cracked vacuum hoses. An extra bit of air can cause a high idle.

[jonfey]

Hi All. New member and first post!! Bought my '74 mk2 earlier this year and hope to meet some of you at some stage at a meet. Been running great but today began to run fast (12-1500 rpm) once warmed up. Will try it tomorrow to see if it's better cold but wondered if anyone had any suggestions as to the possible cause before I blindly investigate those tricky carbs?? Thanks in advance. Dave.

I'm new to stags too David, but I once had a similar problem with a previous classic which turned out to be an air imbalance. May apply to Stags too. Maybe worth the question?

[Ian F]

David,

Process of elimination, firstly check that the throttle is returning fully and not sticking, whether this be something simple like a floor mat catching the accelerator, the cable sticking or the throttle mechanism on the carbs sticking - including the choke cable possibly sticking, holding the throttle.

Once you know this is OK, then check the carb diaphragms and that the pistons in the carb are not sticking.
After that you need to be looking for air leaks or collapsed vacuum pipes etc.

If it's been OK for a while, it could be something simple like the throttle sticking and needing lubricating, don't look for complicated issues 'til you've checked the simple ones.

Ian F

[markmark2]

Hi All. New member and first post!! Bought my '74 mk2 earlier this year and hope to meet some of you at some stage at a meet. Been running great but today began to run fast (12-1500 rpm) once warmed up. Will try it tomorrow to see if it's better cold but wondered if anyone had any suggestions as to the possible cause before I blindly investigate those tricky carbs?? Thanks in advance. Dave.

Sometimes breather pipe from carb stops throttle returning correctly....

[Robmsharp]

There's nothing tricky with the original Stromberg CD175 carbs, I was a newcomer to this type of carb (indeed it was many years since I tinkered with any carbs) and I've found them very easy to refurbish and set up. Theres a lot of great information both on this Forum, in the ROM and on the excellent American Buckeye Triumphs website here; http://www.buckeyetriumphs.org/?page_id=347
Good luck with tracking your fast running problem down.

[steve_stag]

David

I had a similar problem recently - following the link for what fixed my issue.

http://socforum.com/forum/showthread.php?34079-Ticking-over-fast/page3

Steve

[dasadrew]

When it happened to me it was the ferrule of the accelerator cable which had popped out of the bush on the carburettor bracket

[David M]

Thanks all for the tips. Busy weekend ahead under the bonnet!!