Question:
Dear Motorhead,
My 2005 MXZ 800 X is slow to disengage or idle down when you let off on the throttle. Plus its backfiring quite a bit.
My dealer can’t fix it and doesn’t want to. Can you help?
Guy
Response:
Thanks for your email!
As soon as you indicated you have had crank issues with the engine my antennae where up – you better get a leak-down test done ASAP!
Very high idle and backfiring are primary warnings of leaking main seals. If a new seal(s) were installed it/they may not be properly seated.
If air is leaking in and/or out – you will get an overly lean condition and a weird “hanging” high idle. This situation can and usually does cause a piston burn down from being overly lean.
However, you’re engine (I assume it’s a PowerTek?) has a knock sensor which will protect the motor by pulling out timing when the cylinder goes lean and creates knock. Still, you can’t keep running this way.
A leak-down test is needed – pronto!
Motorhead Mark
