I’m after some tuning advice for a Cox XL Scout that I’ve recently purchased and have done some work on to bring it up to scratch as a second mower.
My issue is with tuning the engine. It’s a Briggs & Stratton 11HP cast iron bore four stroke (Model 253707) and the specific issue is that the engine is breaking down under load when I’m mowing.
Before tuning I replaced the spark plug (recommended gap is correct), fitted a new air cleaner element and dis-assembled the carby and cleaned it (I had to replace the main metering needle in the bowl as it was the wrong one fitted).
I’ve found what I think is the appropriate tuning guide in this forum (I’ve attached the guide to this post) and have tried to follow the tuning procedure (as per page 8 in the guide) and I also checked and adjusted the remote throttle/governor (as per page 7).
It seems to tune up OK as I follow the procedure but when I actually try to mow with it it breaks down under load when I engage the blades.
The only modification I’ve made that I thought may have an effect is that I’ve fitted an inline fuel filter and that it may be starving the engine at higher revs but I’m not sure how likely that is.
I’m in Geelong, Victoria, and I can’t find anyone at a mower shop locally who wants to have a go at tuning it so I’m trying to get some advice as to what either may still be wrong with the mower, or what I may be doing wrong.
