Enrichment circuit on Lance 250 carb By billg (Read 2,101 times)

[billg]

It just occurred to me that the 'enricher' has to have voltage because it does heat up just like it did when it tested it.

I could be wrong about how short a time it takes to idle normally, it's just a guess. The problem is, because the 'enricher' retracts so slowly, making adjustments and testing by starting the engine, each add to the 'key on' time which effectively is cumulative unless you wait for more than the 10 or more minutes it takes for retraction between each engine start.

I'd rather have a manual choke.

[Alleyoop]

You can convert it to manual choke I DID. In the summer I got tired of smelling gas from the enricher when I first start it. In hot weather you do not need the Enricher only when it is cold do motors need extra fuel.
Alleyoop

Here is my carb and manual enricher:

[billg]

I posted this message earlier but it seems to have disappeared.  The enricher heats up normally, so it must have voltage.  Of course, this is no guarantee that it's extending, but it's a pretty good indication seeing that it did so when tested separately.  In any case, I just ordered the manual choke kit. 

As it turns out, there is no way to reach the idle mixture adjust screw on the Lance Duke Touring 250 without taking the carb out of the rubber intake manifold.  It is not possible to twist the carb as it interferes with the fitting that holds the coolant temp sensor.  This makes dialing in the best idle mixture setting a very slow process.  The motorcycle special 90 degree long screwdriver for reaching idle mixture screws on motorcycles is sadly not even modifiable to be short enough to fit between the idle mixture screw and the frame.  If you run across one that works, I'd sure like to hear about it.

On another subject, my owner's manual says to use propylene glycol for coolant.  Nobody has it locally in California.  Does everyone just use regular auto antifreeze like I'm doing?

[Alleyoop]

Most use your auto coolant PRESTONE 50/50 mix cannot go wrong with that.
Alleyoop

[Alleyoop]

Billg,
Maybe the only solution is a extension:
Alleyoop


www.motorcycle-superstore.com/18720/i/r-d-racing-flex-jet-remote-fuel-screw?SiteId=Criteo_Active_31-63&WT.mc_ID=11325

[billg]

Appreciate the look out.  I've looked everywhere and can't get a picture of how this extender fixes to the idle mixture screw.  From the looks of it, it will not make the 90 deg. bend in the space necessary to work in the Lance Chinese puzzle.  Right now, I'm inching my way up to proper richness 1/2 turn at a time, the hard way.  Installing the manual enricher will help speed the process.  I'm thinking about an auto choke cable with the handle sticking out just under the front of the seat.

[billg]

I finally got around to checking the voltage to the 'enricher'.  It 4.65 volts and is turned on by the ignition key.  Do you guys think this is a problem?  I checked the enricher using 12 Volt battery power and it worked as advertised.  It still heats up when installed so I assumed (there's that word again) everything was OK.

Bill

[Bashan]

I would consider that a problem on one of my bikes. They either get 12v AC from the stator or 12v DC from the battery. Some of them do have resistors, do you have a wiring diagram?

[billg]

Bashan,

Yes I do have a wiring diagram, thanks to Scooter Doc Forum. The one in the owner's manual is the wrong one. So is the spark plug callout.

On the wiring diagram, I can't find the 'enricher' unless it's the PTC, in which case it gets AC directly off one leg of the magneto. That would account for the 4.65 volts I read going to the 'enricher'. Here is the wiring diagram.

[Bashan]

Yes the PTC is the auto choke. If it gets voltage when the key is turned on that wiring diagram is wrong. If it was from the stator it would only energize when the stator started spinning. Voltage from the key should be battery so unless there is a resistor there is something wrong there. Possibly there's a bad connection or ground. So when you put 12v DC to it how long did it take to come out?

Hey! If it is energized by the key just pull the auto-choke, turn on the key and see if the plunger comes out in 5 or 6 minutes. If it does then that's normal function and there's a resistor in there that it's designed for.

[cyborg]

I think Alley is on it AGAIN and manual choke is the way to go,,,all my bikes have been converted,,,don't miss the auto choke one bit,,,you know Alley doesn't look that smart,,,,amazing

[cyborg]

Just kiddin put the shotgun away Alley,,,,lol

[billg]

Yeah, I figured pulling out the enricher and turning on the key would give me the straight skinny.  Too bad they don't include the wiring diagram of the regulator.  Then we could tell what's going on.  Maybe that's why they don't.  If you come across one, I'd sure like to hear about it.

It will be interesting to see the response with just the key on, and the response with the engine running.

There is a spliced in extra wire in that circuit, identifiable because it is yellow cloth weave covered.  I just assumed (there's that word again!) that it had something to do with a mod to conform to California standards which, in addition to emissions, include a hard wired headlight on.  Guess now I'll have to trace it all out. 

The enricher is acting funny.  In addition to no extra fuel at cold startup, I came out of grocery shopping to restart with too much extra fuel, identifiable by all the characteristics of a flooded engine.  Almost didn't get it started.

I ordered the manual choke from Tsunami Bike.  Their customer service via their website sucks!  No response at all.  Called them and they don't even know about the order.

[billg]

Bashan,

I pulled the auto choke and turned on the key. Nothing. I then started the engine and the auto choke extended within 3 minutes. It figures since the auto choke works by heating an expanding medium that extends the cylinder, and it takes AC to make heat. It took 10 minutes + to retract once the engine was shut down.

I don't know what's wrong with Tsunami Bike in Canada. They do not answer emails or acknowledge orders even after being paid by Pay Pal. Something wrong there. I just want to get my manual choke kit. Today ATT internet is real flakey. Maybe if the NSA would butt out we could get on with business.

[Bashan]

DC will make heat but if the auto-choke comes on when the engine starts it is energized by the stator. So that wiring diagram is probably pretty close. What do you want to know about the R/R? The three phase R/Rs are pretty straightforward.