I would call Bosch at their 800 number or e-mail them and see what spark plug number the suggest if any. You may not have any option but to change brands. Sometimes there is no choice but it sounds like the saws original manufacture had confidence in Champions. Roger
I had nothing but bad luck with champion spark plugs. Champion plugs blogs down chainsaws on some make/models but bosch doesnt. I dont use champion spark plugs on any my personal equipment. I use bosch, autolite, torch, or oregon spark plugs.
I have been a small engine mechanic for nearly 20 years and i have never had a lot of faith in Bosch or Champion plugs - I would personally fit a BPM6F or a BM6F, the projected core does help with carbon issues in the plug or just run the engine at full RPM to get combustion temps up high enough to burn the oil off
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