Emergency Leak-Down Test Needed

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

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