[oil pan 4]

I'm running 2 predator 459cc engines now.
The stump grinder and the wood chipper have predator 459cc engines.
First ecomod, the leaf, riding lawnmower, wood chipper, stump grinder and some day the pressure washer all use the U1 battery size. I have two U1 batteries of AGM construction and an old walmart flooded U1 that will probably last through this year. The newest AGM U1 battery goes in the leaf and stays there. The other 2 get passed around like a joint, all the machines have Anderson connectors so I can just plug and unplug the battery. When the flooded U1 battery dies it's final death I probably won't replace it.

The stump grinder eco mods are a 4 foot long straight pipe and the recommended #97 main jet for my 4,000ft elevation. With the straight pipe and ethanol free gas it doesn't seem to run very rich, doesn't sputter or die on start up.
The straight pipe blows the exhaust away with the debris off cutter head.
I'm going to try a #95 main jet and see if it it will run decent. If it sputters or has preignition I'll go back to a 97 or try a 96.

The wood chipper engine has the 6,000 to 8,000ft elevation #95 jet installed. Runs pretty good, wants to die on start up until the engine warms up a little.
I have ordered a go-kart pipe kit and it will get a 4 to 5 foot long pipe that blasts exhaust gas and noise straight up and away from people.
May not run satisfactory with the 95 jet and long straight pipe. I would like at least a 5 foot straight pipe because that will allow for negative super charging even at a pedestrian 3,600rpm.