SPITTING CARB - 914-6 all stock, Need assistance - please see latest post to this thread Options

[ctc911ctc]

1970 - 914-6 All stock

Got the car off the rack after a 1 year clean up documented here:

http://www.914world.com/bbs2/index.php?sho...3371&st=100

- tightened the lugs, check one more time for leaks.......

Car started first try, backed out of the driveway and went around the block

Drive strong.....very strong......

#2 cyl-carb is still 'spitting' definitely not backfiring. Chasing this through my trusty guide:

https://www.performanceoriented.com/special-procedures-1

See "notes" section

Seems that when I performed the Lean Best Idle procedure #2 failed during the procedure......the diagnosis within the document states that either the path in that carb #2 is blocked or the jet is the wrong size - my bet is a clog......though the carbs were very clean when I got the car.

There is a little noise from the right side, that in a 914-2L 4Cyl would be considered quiet, my hope is that it is not valve noise and may be exhaust leaking......did I tighten the heater manifold small nuts????? dry.gif

Carb advice sought from those that have chased a SPITTING Carb

[gereed75]

Agree with everything here except one thing- the hand throttle simply holds the throttle open, it does not act like a choke. There is no choke provision on these carbs

Starting cold requires a rich mixture. You get that by pumping the throttle before starting This activates the acceleration pump diaphragms to squirt fuel into the intakes and producing a rich mixture. Keeping the throttles closed at that point ensures the mixture stays rich ( which is what the traditional choke does in a choke equipped carb)

Once started, the hand throttle can be used to crack the throttles and increase idle speed to accelerate warm up.

Not saying using the hand throttle doesn’t work for those that use it. It is particularly good for clearing a flooded (overly rich condition) in the combustion chamber by letting in more air while cranking the engine.

[930cabman]

Agree with everything here except one thing- the hand throttle simply holds the throttle open, it does not act like a choke. There is no choke provision on these carbs

Starting cold requires a rich mixture. You get that by pumping the throttle before starting This activates the acceleration pump diaphragms to squirt fuel into the intakes and producing a rich mixture. Keeping the throttles closed at that point ensures the mixture stays rich ( which is what the traditional choke does in a choke equipped carb)

Once started, the hand throttle can be used to crack the throttles and increase idle speed to accelerate warm up.

Not saying using the hand throttle doesn’t work for those that use it. It is particularly good for clearing a flooded (overly rich condition) in the combustion chamber by letting in more air while cranking the engine.

(IMG:style_emoticons/default/agree.gif)

Hand throttle is not an enriching device, it merely opens the throttle plates to raise the idle speed. Once the engine has some level of heat, she should run smoothly at 900 - 1000 rpms