Yes the ball and spring near each jet keeps the jet feeding passages primed, but the non-return valve in the bottom of the bowl (1 per carb) allows the pump to fill then squirt. No seals on mine either until I had to add some because the non-return valves are wrong. There are a fair few parts unavailable for DRLAs that vendors have substituted DHLA parts for without saying because they are...nearly the same. Took me ages to track that down, both carbs were the same.
What hose are you using for the vacuum advance, distributor to carb manifold please?Need to sort mine out to something like yours. Cheers
Just silicone vacuum hose.. https://www.ebay.co.uk/itm/351674259955 But now I can't remember the size.. See above 4mm.. Sent from my SM-G930F using Tapatalk
@Deefer66 yes the one you circled but the o-ring as shown doesn't help if the valve is too short. I had to add much smaller o-rings right at the bottom of the hole to seal the gap made by the short valve. Hard to explain and hopefully your valves won't need them anyway so I'll shut up until you've had time to investigate.
Took it out cleaned it up... squirt mcsquirt face is back in town.. Must have not rinsed through after the ultrasonic bath.. just needed a little prod with a sewing needle to let the ball beating rattle again. Photo of size if originsl if you're interested. Found idle jet stack rubber had been trapped and cut in the dismantle too so will have to try and make one of those to test run! Sent from my SM-G930F using Tapatalk
Excellent, I'm almost tempted to take a carb off/apart to measure my valve...almost but not quite! One day. I seem to have them apart every year for one thing or another. Always bag up your old o-rings I say, glad I did and had a few sizes to try or I'd have struggled. I have more £ into jets and Venturis and other parts than the carbs cost. 13.5mm.
Oldd o rings were shot.. hard and cracked.. good sign it's never been messed with though I suppose.. untill I came along.. double checked the other pump jets while at it.. one was squirting off to the side.. blew out refitted and all good. Quite a lot of squirt for very little pump movement..! Block mated back to gearbox now.. quick cuppa before getting back on hangers and reconnect everything!... see where else leaks Sent from my SM-G930F using Tapatalk
Yarp, it's the spring that does the pumping so it's always identical and even. It must squirt with the merest touch of pedal. That pile of washers, the spacer and springs is odd, I'm sure mine doesn't/can't work properly in terms of being able to adjust the duration. Whatever I do seems to give the full squirt, it's like I'd have to wind the nut right off and more to get any adjustment. Maybe I'm looking at that wrong. Maybe it's for adjusting the range of throttle position where it's effective.
Yes , quite clever bit of set up... The inside sping primes it by pushing out the bellows until it hits the lever. The lever is adjusted on the nut after the pivot, so the further down the rod you wind the nut the more the pump primes, I've got about 2.5mm of rod left. Throttle linkage pushes the nut out of the way and spring on the rod pushes the lever out .. and the pump in.. doesn't need to go far to let it pump out a full dose, pump jet hole just governs the rate it gets to leave, so big jet or small the amount is the same, one bellows full.. just changes how long it squirts for as the bellows get squeezed by that long spring. A smaller jet might atomise the fuel more as its squirted out under pressure, and as it's there to tide you over until the other jets kick in , the longer duration probably lasts until the velocity gets up in the venturi to pull the fuel through..or maybe not... Sent from my SM-T580 using Tapatalk
