hi, the title suggests you have had decent performance in the past and it has just gone off so assuming that...
# are you getting the same revs as normal? # are both the engines performing equally (swap rev ctr pickup to check both engines) # are you using one or two fuel pumps? # are the air filters clean? # are the plugs the correct colour? # is the performance drop off in acceleration or top speed? # is the brake binding? # are the rear axle bearings in good condition? # is chain alignment as good as it can be? # are you using the same make tyres as normal? ( diff' circumf'= diff top speed # are you using the same engine oil as previously? ( changing oil can glaze the bore and lose compression) # have you compared the engines for compression? ( see above for cause)
longwinded and basic but you have to start somewhere...
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