No secondarys

CRAIG · Post by **CRAIG** » Thu Sep 17, 15 1:55 pm

I don't think my secondarys are working. Took it for mot last week and have used it once since, it felt like it was underpowered.

So today I took it out and put the paperclip at the top of the vacuum shaft on the carb. Went for a drive, came back and clip is still in same place.

Also dosent seem to be kicking down and I have adjusted the cable a few times with no joy.

I have recently had the carb (HOLLY 650) rebuilt. secs worked ok before

Any ideas, don't think the guy who rebuilt it put a different spring in.

TW71 · Post by **TW71** » Thu Sep 17, 15 2:24 pm

See what the colour of the spring is, I think black is the hardest and yellow and / or clear the smallest/ weakest.

It may pay you to get the vacuum top which you can quick change the spring , that's if you haven't already

http://www.ebay.co.uk/itm/like/33153738 ... ue&ff13=80

CRAIG · Post by **CRAIG** » Thu Sep 17, 15 2:40 pm

I will swap the spring next week when I get chance, whats the best colour spring to use for average performance?

Pete · Post by **Pete** » Thu Sep 17, 15 5:16 pm

CRAIG wrote:I will swap the spring next week when I get chance, whats the best colour spring to use for average performance?

I would put the lightest in first to prove that the secondaries actually open - you can tune it later.

CRAIG · Post by **CRAIG** » Tue Sep 22, 15 7:11 pm

Had 5 mins free today so checked to see what spring is in, it had the long yellow one in, which I believe is light, I have replaced it with the short yellow one which is even lighter. so it should open if all is well.
I will take it for a spin and see.

Guy · Post by **Guy** » Tue Sep 22, 15 7:43 pm

A quick and easy method of checking is to put a paper clip on the operating secondary pushrod then Bananarama! up under the vacuum canister, take out for a drive give the motor a foot full and when you get back check the paper clip if its moved the the push rod the secondaries are working if not .....there not

CRAIG · Post by **CRAIG** » Thu Sep 24, 15 9:11 am

Hi Guy, yes I did that when I suspected they wasn't working, and paperclip didn't move. I have put the lightest spring in now and will take it for a test drive later.

CRAIG · Post by **CRAIG** » Thu Sep 24, 15 2:00 pm

Took car for a drive, secondary's are now working. Must of been the long yellow spring that was fitted causing the problem.
Just need to adjust the kickdown cable now as its not kicking down.

TW71 · Post by **TW71** » Fri Sep 25, 15 1:19 pm

Great stuff!