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90 hp yamaha 2 stroke

8/23/14 @ 8:34 AM
ORIGNAL POST
reeldrag83
reeldrag83
User since 12/20/12
This one has me baffled. 90 hp yamaha 2 stroke runs like a top at all speeds except wot. Its hard to explain but at 5400 rpms it will just drop a 100 rpms and not a miss persay it just drops for 5 seconds or so then jumps rite back up for say 30 seconds then drops for a few seconds then back up again. I have drained fuel, drained float bowls, replaced all fuel lines and bulb,plugs, fillter, all the standard stuff even ran 2 bottles of sea foam. Any ideas would be great.

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8/23/14 @ 11:10 AM
centralwiwalleyeslayer2
User since 2/15/10
could be the brain box

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