03 F-90 TLRB shaking/loud ticking

mommicked

Lieutenant Commander
Joined
Dec 15, 2009
Messages
1,700
Been a while, hows everybody doing?......My 03 Yamaha F90TLRB has shook when first started/idled for years and then smooths out as it warms up but lately it seems to be worse ( shaking the whole boat (light Jonboat) while on the trailer and I can hear a loud tick about every half second @ 800rpm through the exhaust I haven't noticed before. I'm thinking it's a valve problem ? All advice is apprciated
 

robert graham

Admiral
Joined
Apr 16, 2009
Messages
6,908
Maybe remove and inspect each spark plug for any indications of poor running conditions like lean mixture, rich mixture or partially fouled plug....it's a good place to start...
 
Top