Yamaha FZ1 choke system problems

The misunderstanding and problems of the 2004 Yamaha FZ1's 'choke' system, some of you would say that is easily answered the 2004 Yamaha FZ1 has officially no choke. The Yamaha FZ1 uses, like many other carburetor motorcycles, it instead uses a cold-start enricherner system involving separate fuel-metering circuits in each carburetor.

When you turn on the enricheners, you open a plunger valve in each carburetor that allows engine vacuum to draw a very rich fuel mixture into that carburetor's bore, just on the engine side of its butterfly valve. It has much the same effect as a choke but achieves it in a different way.

Second, if you are encounter an explosive bang out the exhaust when you open the throttle, it is called 'fterfiring', and not be mistaken by 'backfiring'. It is so named because it occurs in the exhaust, after any unburned mixture has left the combustion chamber.
It is nothing to worry about. Similarly, 'backfiring' is when the engine spits back through the intake before the mixture exits the combustion chamber.

Some 2004 Yamaha FZ1's had some small problem in which the enrichener valves did not fully closed. The problem with the enricheners is not always at the same location, therefore you should remove the fuel tank and, with the engine off, keep opening and closing the enricheners while closely watching every part of their operating system, from the cable on the handlebar to the linkage that connects all four plunger valves. Using this method, the cause of the hang-up should be easy to find and repair.

Tag: Yamaha FZ1 1000cc Choke Problem Enricheners Carburetor Cold-Start Vacuum Fuel-Mixture
Rating: 1.00/5 (1 vote cast)

Share It!



How many times have you crashed your motorcycle in the last three years?

  •  Never
  •  Once
  •  Twice
  •  Three times
  •  Four times
  •  Five times
  •  More than 6 times
  •  More than 10 times
This poll has 0 more questions.
Other polls | 8,774 votes | 21 Comments
Thai Motorcycle Enterprise Association
There are no upcoming events
What's New
No New Items
Motorcycle Thailand on Facebook
Motorcycle Thailand on Facebook
My Account