2003 Yamaha F115TLRB

by Tommie
(Ellabell, Ga. USA)

Have a "weak" spark on cylinders 1&4. have swapped coil positions with same result. Replaced both ignition coils, same thing. Ran YDS software for testing and nothing shows as a fault/warning. Went step by step per Yamaha factory service manual and all test results matched the specs given in the manual. You can start the engine and pull plug wire #1 and no noticeable difference, same if #4 is pulled. If either plug wire # 2 or 3 is pulled the engine will shut down. All ground terminations are clean and tight. There is a termination point for a group of "grounds (red/yel) wires all come together on the port side, that was also checked and was in good shape. The engine starts if you touch the key, the engine hours are 243. any help/direction would be great. TIA

Comments for 2003 Yamaha F115TLRB

Average Rating starstarstarstarstar

Click here to add your own comments

Aug 28, 2021
Yamaha trouble
by: Terry Baughan

Not sure about the 4 cylinder models but on my 90 hp Yamaha the #2 cylinder is controlled by the cdi unit. My engine would start great but only go up to 2000 rpm until it warmed up then run great all day. Others have had a bad cdi that ran fine until it warmed up then would cut back to 2000rpm. Replaced my cdi unit which cost $750 but now runs great, so check to see if on the 115 hp yamaha if the cdi controls those with low spark.

Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Yamaha Outboard Forum.