Unsure if it helps the general brains trust, I found a ripper of a DCD manual from the mazda guys,
H'mm. There may be a gasket on all four sides, but the fuel bowl needs to be vented - somehow. There may be a passage / cavity / gallery on the underside of the top cover. From memory most carbys are vented to above the venturi area, under the top "horn" of the carby.Yes, I have 3 complete carbs, but only one set of jets, choke tubes for correct tune for Renault motor. All 3 of the carbs were originally fitted to 1500cc Cortina GTs.
There is no vent to the float chamber. The top gasket seals the top of the float chamber on all 4 sides.
Henry
Hi. I like your thinking and agree that this could assist in identify what is occuring. Like others here, I am keen to understand the answer to this riddle.Been busy the last few days and haven't had much time to think about this issue. Just read through this thread again, we need to get this solved for every ones sanity.
I have thought of another test that can be tried.
Remove the carby top and put it aside, remove the fuse that supplies power to that electric fuel pump. Fill the float bowl to about the half way mark and then start the car and see how it runs. It should idle and be able to be revved up until the float bowl runs dry. You should still be able to look down the primary barrel and see what is happening with the auxiliary ventury (if fuel is pouring out into the primary barrel).
The thinking is to eliminate the bottom part of the carby with all the jets etc. You could repeat the process raising the fuel level until you can simulate the problem you are having.
At least there's a good garage. Moving is terrible!<thread hijack>
Ah. Sad to say the 807 didn't make the move down to Melbourne with me It's been looked after buy another reno tragic, very very confident it's going to be put to very very good use
I've sacrificed heaps in moving back actually. The Motorbike (it yes a Series 2 Yamaha, Yellow TDM900. Bloody wanted one for ever and got it $$ (made money selling it) and was just getting comfortable with it, Fell in love with it because of the Yamaha TRX that shared the parallel twin, anyway, I'll never see another one that nice in yellow again. booo) that 807, and the Yellow R12 submarine I nearly had back together.
Moving sucks. No wait. Moving without a heap of cash sucks!
Thankfully new house has a good garage, moving in after Easter, shenanigans can continue
</thread hijack>
Glad its going again, the only thing is that we never found the route cause of the problem so it may raise its ugly head again, ol well we will see what the future brings. In the mean time have fun terrorising those streets of Christchurch.IT'S WORKING!
After being off the road for about a year, my R10 is now running sweetly again. After stripping cleaning, replacing, adjusting, swopping parts and re-assembling the bits and pieces of the 3 carbs that I have, about 50 times, I tried starting the b>?#h again and it just started idling and revving as normal without the clouds of black smoke and fouling of plugs.
All the original jets, choke tubes etc. have been reinstalled and all the settings are as when the problem first started.
I have been playing around with these carbs (and cars) since 1969 and I have never come across any thing like this before, even the guys at WEBER Specialities (N.Z.) could not help me.
The car has just passed a roadworthy test and I'm back, terrorising the streets of Christchurch.
Thanks again for all the help offered by fellow Froggers
Henry