fuel enrichment system

[saw11mill]

can someone tell me how the fuel enrichment system works thanks in advance

[greasyshaft]

it gives the engine more fuel...

what model engine are we dealing with??

[boscoe99]

Yes, need to know the model.

Some models use choke plates, some use solenoids, some pulse the fuel injectors longer, some use an electro-thermal valve, ...

[saw11mill]

it is a Yamaha 225 hp model 1995 225tlrt

[rodbolt17]

it works well.

[saw11mill]

it gets fuel from the top carb bowl
it has two solenoids
dose the key switch activate it?
or dose the key switch activate something on cpu and it activates it?

[saw11mill]

when I lift the red lever on the side it only has fuel coming out of one hose (it has 3 hoses

[rodbolt17]

the top fuel pump is the enrichment pump.
it draws fuel from the top carb.
the ECU controls the soliniods.

[boscoe99]

The enrichment system on the 90° 225HP engines (1990 - 1995) is con*****ed by a microprocessor. The choke switch and choke valve system have been eliminated. Temperature and throttle position are monitored and enrichment is automatic. An electromagnetic valve unit with a pair of injectors with different diameters are used to provide enrichment. Timing advance is also con*****ed by the microprocessor, thus eliminating the need to advance the throttle during startup.

Need to know more or is this enough?

[saw11mill]

ecu ??????????????????

[saw11mill]

so I don't have to push in on the key switch to activate it

[saw11mill]

where would I find the microprocessor

[coueytwo]

It's the CDI unit under the black plastic cover on the back of the block.

[saw11mill]

ok thanks if there is something wrong with mine is the some were I can seed it to be fixed (they don't offer any new ones)

[boscoe99]

ok thanks if there is something wrong with mine is the some were I can seed it to be fixed (they don't offer any new ones)

Joe's Marine Services
Address: 652 Harbor Rd, Wanchese, NC 27981
Phone: (252) 473-6267

Ask for the crusty ole guy in the back to do the work.