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Old 08-21-2012, 10:06 PM
Drenhead Drenhead is offline
LawnSite Member
Join Date: May 2005
Location: Oklahoma
Posts: 1
Exmark Lazer Z HP dropping RPMs for no reason

I have an older Exmark Lazer Z HP that seems to be losing RPMs for no reason. It is from about 2001 - 2002 timeframe. The Engine is a 21hp kawasaki.

It will seem to be running just fine, then all of a sudden, the engine will sound like it is bogging down and the blades will start losing a bunch of rpms. This happens whether I'm going thru grass or not. It will sometimes do it whether the blades are engaged or not.

After a while of this, it will just pop back to full RPM and seem to run fine for a while, then it will do it again for no reason.

Could this be a fuel pump or fuel filter issue? I had it to the shop, but of course it wouldn't do it while they had it.

I appreciate any suggestions you can give.
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Old 08-22-2012, 02:00 PM
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tobylou8 tobylou8 is offline
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Join Date: Dec 2008
Posts: 1,723
You "might" have a head gasket leak. I had a similar problem on my "Toro"/Exmark and that fixed it. Only your mechanic will know for sure though.
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Old 08-22-2012, 08:17 PM
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piston slapper piston slapper is offline
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Join Date: Mar 2010
Location: Tampa Fl
Posts: 4,221
Loose connections on coils...maybe bad sparplug boots..maybe bad coils..
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