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914World.com _ 914World Garage _ changing idle jet

Posted by: JBart Apr 8 2007, 06:07 PM

OK I just changed my idle jets from the stock 52mm to 47mm because the car is way over carbed 1.7 w/44 webers but till i find smaller carbs I jetted them down But my idle has rised it now idles at about 1600 RPMs sence I put smaller jets in do I to readjust the idle ? If so do I use the linkage to so or are there screws to adjust the idle ?

I'm a newbie so gentle

Thanks,
jbart

Posted by: Joe Ricard Apr 8 2007, 07:50 PM

That is EXACTLY what should happen. Leaner means more power (to a point)

So now you need to optimize the idle mixture screws. Start with 1.5 turns out front gently closed.
(As you do this next step you should hear the engine pick up more speed as it leans out.
- turn them in ever so slowly till the engine slightly begins to drop speed
Turn them back 1/4 turn.

Now with your synch tool equally turn out the idle stop screws till you obtain 900 - 1000 RPM

When you get this part done let us know so you can tell us how it runs and then wecan do the next step.

Posted by: Aaron Cox Apr 8 2007, 07:51 PM

joe nailed it.

Posted by: JBart Apr 8 2007, 09:03 PM

Thank you Joe,
Tommorow will go pick up a syncro tool from the local VW shop after work and let you know how it went .

Thanks again,
jbart

Posted by: bperry Apr 8 2007, 11:02 PM

I highly recommend this book: http://www.cbperformance.com/catalog.asp?ProductID=4
It is only $10 and is a wealth of information.

--- bill

Posted by: Joe Ricard Apr 9 2007, 08:12 AM

Wait till the weather changes....
Like this past week I jetted for 85 degrees and 90% humidity.
Then when I went to see Barry in Pensacola on Saturday it was cold and dry. 40's and maybe 35% humidity. A/F went from 13.5 : 1 to 14.5 : 1 and as it got colder I was really too lean seeing 15:1 at certain speeds. Was getting intermitant spits back on the carbs. Carbs start spitting around 16:1