OutdoorKing Repair Forum Forums Restoring, Customising and Modifying Tech Talk SB Model 45 - Clutch and Engine Problems

I'm not seeing any dirt or problems, Stuart. Did the carb cleaner squirt out of the pump intake port when you sprayed it into the mesh screen on the long pickup pipe? Did you have any difficulty pushing the fine copper wire through the main jet? Can we see a picture of the mesh screen after cleaning please?

Joe, because the engine stopped running after being out of service for a while, fuel deterioration is a more likely source of the trouble than dirt build-up. However there was a reasonable accumulation of dirt in the small chamber right under the main jet. I can only see a blocked pickup pipe as the problem if something like gum developed right across the screen. This would be a likely scenario if there were 15% ether (MTBE) in the fuel during a storage period, but hopefully we don't have ether in the fuel here in Australia. Claggy yellow fuel, probably due to ethanol, blocking the main jet (with some help from accumulated particulate matter around the jet) seems like the most likely cause to me, at this moment.