HELLP = Choke problems... !

[guyom]

Hi guys, I have a problem: i cleaned my carb (separately) so rebuilt then with new seals after cleaning... and now my choke does not work.

When the motor is cold, the choke does not help to start...

Another test, when the motor is warm, if i put the choke on, the motor chokes... and stop and i was thinking that the RPM should increase.

So i checked the discs (perhaps upside down) but i think no (if someone has a picture of good disc position, level in correct position, i'll take it) when i pull on the cable of each choke, at the beginning the RPM increases but quickly the motor chokes...

Or perhaps the mix air/gaz is not good (too rich ??) and when i restrict the air with the choke, there is no air at the end... and the motor chokes? Any other idea ?  

[Barry]

Correct orientation of the choke disc is easy if you understand how it works. Fuel enters via progressively larger holes at the bottom of the disc and the mixture exits via a tapered pear shaped slot at the top of the disc. The enrichers are correctly oriented when the pear slot is at the top of the disc and points towards the cylinder head.  The animation below shows the enricher moving from the off position through the 4 progressively larger fuel holes and back to off again.

[montmil]

Photos may be of help:

[guyom]

Herés mine !

[guyom]

Looks good but i want that wrong to answer my problems... Otherwise i need to look for something else.... Perhaps mixture screws : i found them at 3 turns so far from the 11/2 recommanded to start to find the good ratio ?!

[guyom]

I forgot to mention that the levers are down of each, so inducate 5:00 for the Left one and 7:00 for the Right

[Barry]

I forgot to mention that the levers are down of each, so inducate 5:00 for the Left one and 7:00 for the Right  

That sounds correct for the off position as long as  they both hit the stops at the same time.

3 turns out on the mixture screws sounds very rich even 1 1/2 turns out sounds too much but you haven't given us the model and year  of the bike.

[guyom]

Sure i've got a R65 1981

[Bob_Roller]

There is a small dimple on the threaded end of the brass shaft that the disc is on .

The dimple is offset from the  center of the shaft, the dimple should be towards the arm that the cable goes on.

The  disc can be 180 degrees out, but still goes together .

[montmil]

Lot's of Bing CV Enricher Circuit info on Snowbum's site.

[Barry]

Sure i've got a R65 1981

I believe the base line setting for your mixture screws is only 1/2 turn out or 3/4 at the most.

[guyom]

Thanks Barry. only a 1/2 turn Whaaa ! It's not a lot and far from 1 1/2 or more. Do you suggest i start the setup at 1/2 and try to see if it's good ? Is it possible that with my setting (3 turns) the choke does not work with ?

Just to understand well : when the screw is closed (we can say 0 turn :-)), there's less air, so it's rich ? Or the inverse ?
Thanks for time

[Barry]

Yes you should always start the mixture adjustment from the baseline setting. Gently turn in the screw until it stops and turn out by the specified amount.  From that base line setting Turning further out richens the mixture and turning in weakens it.

If the engine doesn't idle reasonably well at the baseline setting there is usually something else wrong with the carb.

The enrichers are completely independent of the main carb and have no interaction with the idle mixture adjustment.

To be certain of your baseline setting for the mixture screw check your carb model no against this list.

1/2 turn
64/28/201, 64/28/202, 64/28/301, 64/28/302, 64/28/303, 64/28/304, 64/32/203, 64/32/204, 64/32/307, 64/32/308, 64/32/347, 64/32/348, 64/32/201 (US), 64/32/202 (US), 64/32/223, 64/32/224, 94/40/107, 94/40/108


3/4 turn
64/32/305 (UK), 64/32/306 (UK), 64/32/321, 64/32/322, 64/32/325, 64/32/326, 64/32/335, 64/32/336, 64/32/349, 64/32/350, 64/32/351, 64/32/352, 64/32/353, 64/32/354, 64/32/357, 64/32/358

1/2 - 1 turn
64/32/9, 64/32/10, 64/32/11, 64/32/12, 64/32/13, 64/32/14, 64/32/201 (UK), 64/32/202 (UK)
[edit]
1 turn
64/32/19, 64/32/20, 94/40/109, 94/40/110, 94/40/113, 94/40/114

[guyom]

héhé thanks. just a question: where i can find the no of my carbs ?

[guyom]

I will try to find the number and test the carbs. However, if i well understand what you write, the problem with my enrichers can not come from the setup of my carb so definitely i do not understand what's happen, the disc are in correct position, cables are ok... If you have any other ideas...

Anyway thanks for help.