Thread: gp 1300r tuning question
02-21-2009, 07:13 PM #1
gp 1300r tuning question
I have a 2003 gp1300r that is running great but i think is running lean in the 2000 to 5000 rpm range cause i can hear a (blup,blup,blup) sound that i think that is call (flat spot). the engine is running great, it don't die or surge but i always hear that sound that i want to get rid off. it can easely be heard from the shore.
When i bought the ski,the previous owner had put in NGK BR8HS instead of BR8ES in it. The BR8HS tread is about 1/4 inch shorter then the BR8ES and when i rode the ski with the BR8HS the flat spot is reduce by half, it must be cause by the combustion chamber volume being a little bit larger due to the gap left by the plug.
That why i'm guessing that it is running lean.
So is there a way to richen the mixture on a gp1300 without buying a $400 efi control module
02-21-2009, 07:16 PM #2
02-21-2009, 08:17 PM #3
ok thank's, but how do you call that sound? is it a flat spot
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