Fuel primer pump and OFF/ON Enricher By widehide (Read 2,586 times)

[widehide]

Here are a couple of things that made my life easier and my wife happier with her MC-250-54B. My sometimes hard starting problems have been solved by adding the primer plunger pump and off/on switch for the enricher. Thanks to JR for suggesting the Y conn instead of T connectors.

[Bashan]

Ok, I get the primer, very neat indeed. Now, it was my understanding that the enricher was on until you sent power to it by starting the bike. Then, a plunger comes out and shuts off the fuel enricher pathway after a few minutes. So what does the switch do, cut power to the enricher so it comes back on? Or does a 250 work differently than a 150? Bashan

[jct842]

on two of my scooters, the carino and the yamaha riva I have been contemplating installing a chainsaw primer button from gas line to inside the venturi or vacuum port. I don't use them much any more and it don't make sense to run the battery down and wear out the starters cranking with no gas in carb. monday I was asked to bring the carino down to the insurance agent for a picture since his co. did not have the carino in its data base. first ride of the year on it and it did not loose any thing sitting since nov or dec. "seafoam" just wondering if going into a vacuum port would keep sucking gas after it starts up. probably would be better to introduce raw gas into the venturi where there is less chance of a strong vacuum to keep pouring gas in to engine. john

[widehide]

bashan, with no power to the enricher, switch in the open position while the engine is running
then the plunger remains retracted, thus enriching the mixture, until you flip the switch to the closed position, applying 12 v to the enricher. About 60 seconds later the plunger extends, and stops the enrich process. This puts you in control of how long you enrich the engine, In very cold climates this might be of use to someone.

jct842, do not use the chainsaw bulb type primer, it has a weak check valve and will allow fuel to be sucked past it. The plunger type primer is designed for Jet skis, Ultra lite airplane engines etc and does not let fuel pass under high vaccum. Ok on my 54B, 257cc engine I was not sure of which nipple on the carb was directly into the venturi, and the vaccum line goes to the top of the CV carb diaphram, I dont want fuel there, I wanted a direct shot of fuel into the intake manifold. I used one of the available vaccum nipples that are on top of the intake manifold right between the carb and the engine. It works great, I have the plunger mounted down low, I use clear tubing, When the engine runs I can see that the fuel is not being drawn up the tube . 2 Pumps on the plunger, Slight throttle twist open, hit the starter and it is running. Thats about as simple as it can get. Have a good evening.

[zugzug]

Ill have to remember the on/off switch idea.
-Zug

[Alleyoop]

Question on the enricher, in warm weather you don't want the needle to be retracted. It will start just fine without needing extra fuel. How do you get the enricher to close right away?
Alleyoop