bowtieboy77
Member
I posted a thread almost a year ago about a 135 perkins gas hardly running even after a massey dealer billed me $800 to repair. As a quick back story the points welded togeather. I replaced points , condenser, plugs, cap and rotor, rebuilt carb and could not get it running properly. Massey dealer replaced all the above, and tore carb apart again, also installed a coil requiring a ballist resistor and ballist resistor. It ran good for a few days then went back to the way it was before (hardly run, back firing only run with choke on) I was very frustrated so I left it in drive shed until a month ago. I disassembled carb again and checked float height. I got it running and have been setting timing.
After engine is warmed up my idle is 850rpm and timing set to 12 degrees BTDC. It idles fairly smooth but if I give it throttle to fast it will back fire a few times then clear up. If I hold throttle around 1800rpm it will back fire lightly once every few seconds.
If I slowly give it throttle it will increase rpms with no popping.
If I advance the timing to 30deg it runs slightly rougher but will accept throttlequicker. I also checked my advance by setting timing to 12 deg at idle then increase rpm to 2000rpms and rechecked timing and noticed its about 26deg which is per spec.
I think I am very close to having engine fine tuned just wondering if anyone has any suggestions as to why the engine will backfire when throttle is pulled to quickly?
After engine is warmed up my idle is 850rpm and timing set to 12 degrees BTDC. It idles fairly smooth but if I give it throttle to fast it will back fire a few times then clear up. If I hold throttle around 1800rpm it will back fire lightly once every few seconds.
If I slowly give it throttle it will increase rpms with no popping.
If I advance the timing to 30deg it runs slightly rougher but will accept throttlequicker. I also checked my advance by setting timing to 12 deg at idle then increase rpm to 2000rpms and rechecked timing and noticed its about 26deg which is per spec.
I think I am very close to having engine fine tuned just wondering if anyone has any suggestions as to why the engine will backfire when throttle is pulled to quickly?