burning rich smell

[bob johnson]

so I have a 1997 faststrike 175 that I was running on the Hudson river Monday. while idleing I could smell a strong burning rich smell.... burnt my nose a little... since its winter and I cant easily run the boat at home on muffs to try and 'tune" it.... and the fact that I think with the 2 more cylinders than I have been used to( I usually ran V4's) I am thinking it would be harder to truly listen to the subtle noises of sneezes and cough to determine proper idle mixtures. soooo I am asking ABOUT how many turns is a good guess at calming this burning rich smell.... all the carbs were turned in and backed out according to the book when I first got the motor in uses last summer. so they would probably all need the same adjustment.... I was going to do one full turn each......id appreciate some feedback.....but know , I already know I cant do it the way it should PROBABLY needed to be donwe...I am only looking for advice on how many turns of the idle rich screws....thanks

bob

 

[Crosbyman]

different oils different smells ....did you change oil type

 

[bob johnson]

different oils different smells ....did you change oil type

no, I have had about 5 gallons of BRP synthetic oil for a few years now, and I used that. It is a rich running smell that applies to auotmoblies as well...I remember back in the carbuerator days cars running extra rich had a similar smell....its not a burnt oil smell.
bob

 

[jimmbo]

If the carbs are 'backed out to according to the book' then they are really rich. As you implied, tuning 4 carbs was hard enough... In theory, turning each in the same amount should work, but for some reason it rare seems to. Myself, I would run it in gear a little above normal idle, say 800 - 900 rpm. Lean one carb for highest rpm, then richen it 1/4 turn, repeat for other carbs, returning to the rpm you first chose. Then go back and do it all over but backing out 1/8 turn. Set idle at speced rpm and see if further adjustment makes much difference. Check for bogging on acceleration. If does back each needle out 1/8 and try again. It worked for me