agforman
Posts: 2
Joined: 9/20/2008
Status: offline
|
Hi,
Just developed a new fault on my Yamaha WR500
Starts and runs fine at idle / low revs, but as soon as you rev it up it starts to cutout almost as if it's hitting the rev limiter, but at nowhere
near full rpm doesn't actually stall
Checked overheat sensor - all OK.
Compression is 140Psi on both cylinders, 3 sets of plugs tried - same result.
Done all those tests:-
Coil HT ..........5.5 Kohms
Coil LT ..........0.3 ohms
Lighting Coil ....1.2 ohms
Pulser coil ......104 ohms
charge coil .......88 ohms
Also trimed ht leads back 2 inches to clean wires and refitted caps
Connected a strobe light and ran it, light fires OK until you rev it then at the same time as
it appears to hit the rev limiter the strobe goes out as it stutters, indicating that the spark
is switching off - it's the same for both plugs.
Connected a 12v light to the LT side of the coil and that also dims/goes out as the engine
stutters, it is just like it is hitting the rev limiter, but why would it cut in so early?
Faulty rev limiter??? wiring
CDI problem???
Any ideas?
Cheers, Tony.
|
Printable Version
Cut out / stutter at high revs - 
New Messages
No New Messages
Hot Topic w/ New Messages
Hot Topic w/o New Messages
Locked w/ New Messages
Locked w/o New Messages
Post New Thread