carburetor malfunction |2.25 ,5mainbearing

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piston-return-spring

piston-return-spring

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Ok , so this time need help to adjust the carburetor.

Before i started stripping every down to restore it ,the engine ran high at idle and too rich because it drowned every time you accelerated..

Now i have the same issues plus that a bang and then smoke comes out of the carb. :( Whenever it does that the engine stops turning.
Could that be cause of the wrong volume mixture????

She fires right up with the choke engaged but as soon as you take some choke off it dies. Same thing when you push the accelerator.........

And here my next question : How to adjust properly the Volume mixture screw?? I know it needs to be done when engine is hot but it wasn't getting hot because after half an hour of cranking the batteries were too low.... :(

thank you if you reply:)
 
sounds like yer have air getting in on one of the manifold gaskets somewhere or a cracked manifold

is it a zenith carb yer running or solex
 
Are you sure its too rich or too lean? Symtoms can be similar. First thing to do is adjust the timing as suggested, check valve lash and make sure its got fresh fuel and a working fuel pump, no leaks etc....
The engine should run ok even if the volume screw is a bit off optimum so if its doing random things then its likely something else is afoot.
Try the screw 2 turns from fully in ( be gentle) and if its not running at least in some passable form, something is afoot.
If all is ok ss above then you may have a warped carb leaking fuel or a malfunctioning accelerator pump or maybe the float is causing an issue.
Check another post of mine with a zenith bulletin link, if you have a weber then it wont be much help!
Good luck
 
yep i would turn the mixture screw in all the way then out 2 turns then 1/4 of a turn that should see it running reasonable then minute adjustements until your happy with it also check that your nuts are properly tight on the manifold and its not damp around the gaskets (loose nuts can cause this) even nipping them can help and get it running on choke the put a glove on and losen the adjustment nut on the dizzy and see what happens it should pick up and drop off you will see what i mean if you have a timing light you can dial your engine in to standard settings or like me i run at 4 degrees advance because i am running a fuel cat and tank pellets which make the fuel leaded again so just play you will find about 6 or 7degrees advance good and it will be running fast then slow it down go and sniff the exhuast and itshould be pretty good
 
ok thanks for the advises , will try that tomorow.
Forgot to mention that it is a Zenith carb.
I just Need to buy a timing light for my 24 volt system , and i will look at the timing too :)
 
If your anything like me you will spend many hours trying to find out what is wrong with fuelling, ignition etc....

I bought a brand new Britpart Zenith in the end as I couldn't be arsed with old carbs and wanted something guaranteed to work. It only cost £42 delivered but the accelerator pump wouldn't work out of the box. I stripped it down and found the ball bearing for the pump had slipped out of its seat. Bit shoddy really for a new carb. I have 3 carbs in my garage after buying old ones and trying various things. Ridiculous really.

These Zenith carbs are fickle things I have found. If you suspect the carb may be faulty in some way, in the long run it will save you time if you just strip it down, check everything, lap the mating surfaces, new gaskets, blow out with compressed air, new volume screw etc.... and then see how it performs. Use that service bulletin as a guide.

Good luck dude;)
 
Sooo , today i retarded the ignition , was already better after firing her up , didn't do so much backfires.... ;)

Then did what you told me : turn the volumescreew all the way in and then 2 turns and a quarter out. Was way better then before , didnt died after half a minute....

Smoke is white and black....

I have a question , the rotor arm from the distributor (Blue thing) is it normal that there exists some play ????, the play comes from the nut that connects the gear and the distributor. (bit worn )Schouls ther be some play

I think i just have to adjust timing a bit, or more properly..

But still i can't let the engine run without choke ....

When i took the sparksplugs out , i found the the plug from the second cylinder wasn't so black like the other three , pretty clean actually??!! What is going on?
 
piston-return-spring said:
Sooo , today i retarded the ignition , was already better after firing her up , didn't do so much backfires.... ;)

Then did what you told me : turn the volumescreew all the way in and then 2 turns and a quarter out. Was way better then before , didnt died after half a minute....

Smoke is white and black....

I have a question , the rotor arm from the distributor (Blue thing) is it normal that there exists some play ????, the play comes from the nut that connects the gear and the distributor. (bit worn )Schouls ther be some play

I think i just have to adjust timing a bit, or more properly..

But still i can't let the engine run without choke ....

When i took the sparksplugs out , i found the the plug from the second cylinder wasn't so black like the other three , pretty clean actually??!! What is going on?
Click to expand...

oil in yer second pot ( most likely a valve stem oil seal popped off ) could even be the tappet wants a little adjustment to allow it to shut propperly ;)
 
piston-return-spring said:
Sooo , today i retarded the ignition , was already better after firing her up , didn't do so much backfires.... ;)

Then did what you told me : turn the volumescreew all the way in and then 2 turns and a quarter out. Was way better then before , didnt died after half a minute....

Smoke is white and black....

I have a question , the rotor arm from the distributor (Blue thing) is it normal that there exists some play ????, the play comes from the nut that connects the gear and the distributor. (bit worn )Schouls ther be some play

I think i just have to adjust timing a bit, or more properly..

But still i can't let the engine run without choke ....

When i took the sparksplugs out , i found the the plug from the second cylinder wasn't so black like the other three , pretty clean actually??!! What is going on?
Click to expand...
i will take some piccys today for you so you can see should not really be anyplay in the dizzy as mentioned if you want a spare to play with just let me know and if itonly runs on choke try your tickover screw so it overrevs about 1500 or 1700 rpm then put the choke in and because its already revving it should stay running and you really have to play with your carbs adjustment like 1/32 adjustments until you feel it is running nice for you but if it only runs on choke it sounds a bit weak on the mixture
 
oil in yer second pot ( most likely a valve stem oil seal popped off ) could even be the tappet wants a little adjustment to allow it to shut propperly
Click to expand...

i don't think thats the case cause engine only has 25000 km on the clock and i have adjusted the valves a month ago.. :)

i will take some piccys today for you so you can see should not really be anyplay in the dizzy as mentioned if you want a spare to play with just let me know and if itonly runs on choke try your tickover screw so it overrevs about 1500 or 1700 rpm then put the choke in and because its already revving it should stay running and you really have to play with your carbs adjustment like 1/32 adjustments until you feel it is running nice for you but if it only runs on choke it sounds a bit weak on the mixture
Click to expand...

I idles already high about 1200-1500 rpm ( if i have good ears ).
but can't it be the problem it fires on the wrong cylinders???!!! You can turn the distributor 360°so it is possible... So could it be possible that I actually adjusted the ignition but on the wrong cylinder ??!!( cyl.2 i think) ....... :(

That would explain the smoke coming out of the carb and this stops the engine from reving.....

It ran already bad like that when i bought it 2 years ago...
Or am i wrong??? :/
 
no you cant turn he dizzy 360 degrees it should only give you a 10 degree movement and the dizzy has a bigger retaining ring on your adjuster slot try using a standard civvy one you will see what i mean (army dizzy slightly fatter) technically you can turn it 360 but you have to take the 7/16 boly all the way out in doing so lifting the dizzy slightly (not really advisable when running) then you can turn it as you like when running, also connect your timing light to only 1 battery but you will have to run extension wires (jump cables should do) then it should work as normal as it will still sense the voltage going to the spark plug and being that the voltage is a lot higher than 12v going through HT leads so it should work ok have a play
 
Yes , the fault i made was to take the pinch bolt out and everything stripped....

Found out today that one battery needs to be replaced ( isn't charging to) ....

have to go buy one , probably Wednesday , as i have no driving licence ...

hope it the engine will run smooth before i get my driving licence ..

Anyway thank you for your help :)
 
Will take the carb of and take it apart , repair it. One more question , when the rotor arm touches the contact for the leads , is it firing just after it didn't touches the contact anymore or does it fires exactly when it touches it.?????
 
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