<VV> Mower problem - NO Corvair

[Hugo Miller]

My best guess would be a blocked fuel tank vent. What I would try is 
rigging up a gravity feed to the carburettor somehow & see what it does. 
Or take the muffler off & annoy the neighbors ;)


On 2019-11-04 15:02, Grant Young via VirtualVairs wrote:
> This is one of those shots in the dark, but I have struck out in
> attempts to solve a problem with my Toro Zero-Turn mower with a 
> Kohler
> 27HP V2 engine, so I am hoping someone out there might be able to 
> help
> diagnose. There are some Toro help sites, but no help there either.
> The engine stars and runs fine for the first 5-10 minutes, then
> suddenly goes into some sort of loss of power mode and backfires
> through the exhaust (enough to blow a hole in the muffler). Taking 
> the
> load (blade drive) off helps, but still not much power, similar to
> having water or contamination in the gas. Then for no reason, after 5
> minutes of this, it will jump back into the power mode and be fine 
> for
> the next 15-20 minutes. Then another bout of power loss and back
> firing for another five minutes, (I just sit and wait, knowing it 
> will
> recover) then I can finish the next 2 hours of mowing without
> incident.
>
> I have rebuilt the carburetor, changed the plugs and fuel pump,
> replaced all the fuel lines, fuel and air filters, and drained the
> tanks completely. Fuel octane doesn't make any difference nor did a
> bottle of Heet. I also use Sta-Bil ethanol treatment, but tried it
> once without it.  I could almost live with this except for the cost 
> of
> patching the muffler each time I mow. Don't want to put on a new one
> until I find the fix. It is a fairly low hour 60" mower.
>
> A private reply is fine. Thanks much,
> Grant
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