Folks I picked up a MTD Chipper Shredder with a HM80 Tecumseh powering it. When I looked at the unit the fellow started it and it ran well. Started easily and ran at peak revs well. The only thing it did was that it backfired if decelerated too quick, according to the owner. He said the large flywheel/cutting disc kept the motor spinning so he decelerated it slowly.
Today I started it after bringing it home on the weekend. It fired first pull but ran with the occasional miss. After warming it up I put some clippings through it and didn't sound fine. It was missing and backfiring.
It seemed odd as I putt clippings through it when I picked it up and it didn't miss a beat.
I am thinking that the trip home on the back of the ute may have put some gunk through the fuel lines and causing the syptoms I experienced today.
I do know that the seller said the unit has done very little work but has sat for quite a while. Upon getting it ready for sale he put in a new needle and seat and float. He said the bowl was gummed up from stale fuel.
Today I pulled the bowl off and it was still fairly gummed up. I'll try and clean it during the week.
I cannot find any numbers on the carb itself. Only on the long intake port. Would this be the carb number?
Is anyone able to identify the year of manufacture of the engine with these numbers 8HP Cast Iron Sleeve HM80 155426M SER 1308D?
Thanks
Alf
