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87 Yamaha 70 starting problems
In2Deep	#1  Posted on 06/01/09 - 9:11 AM
Member Personal Page Posts: 177 Comments: 0 Joined: 08/14/08	1983 Outrage 18 with twin 70 hp Yamahas,starboard motor runs/starts fine,port one is a pita to start,just cranks and cranke till it eventually ,sometimes after 10 mins starts,then runs fine the rest of the day. It has new fuel filters,plugs, and this weekend I took off the airbox and it actually fires up relatively quick? Any ideas? The airbox seems clear? Thanks,Jerry
Derwd24	#2  Posted on 06/01/09 - 9:17 AM
Member Posts: 1607 Comments: 9 Joined: 05/09/07	When you say it fires up relatively quick with the airbox off, do you mean from a dead cold start? And when you say it runs fine the rest of the day, it starts normally when warm? Dave - 1983 Outrage 22
In2Deep	#3  Posted on 06/01/09 - 11:32 AM
Member Personal Page Posts: 177 Comments: 0 Joined: 08/14/08	Yes form a dead start,after sitting overnight. And yes again it starts normally when warm.
Derwd24	#4  Posted on 06/01/09 - 11:41 PM
Member Posts: 1607 Comments: 9 Joined: 05/09/07	Any chance a compression test was done when you bought the boat? Dave - 1983 Outrage 22
In2Deep	#5  Posted on 06/02/09 - 4:43 AM
Member Personal Page Posts: 177 Comments: 0 Joined: 08/14/08	negative
Phil T	#6  Posted on 06/02/09 - 5:35 AM
Administrator Personal Page Personal Album Project Albums Posts: 7043 Comments: 6 Joined: 03/26/05	How long has this been a problem? Last time the carb was cleaned, adjusted? What is your procedure for a cold start on this and the other engine? Two thoughts: 1) electrical - Are the battery cables recent? Check for a hidden splice or loose/dirty connections. (Had a cold start issue with my Yamaha 90) 2)Carb/choke setting: Maybe the carb is misadjusted so there is too much fuel. 1992 Outrage 17 I 2019 E-TEC 90, Viper 17 2+ 2018 Load Rite Elite 18280096VT
In2Deep	#7  Posted on 06/03/09 - 12:26 PM
Member Personal Page Posts: 177 Comments: 0 Joined: 08/14/08	I think if it were a battery cable the starter motor wouldnt be cranking the motor? I think your probably right on with the carb mixture adjustments. Ill also check the grounds. Thanks,Jerry
Phil T	#8  Posted on 06/03/09 - 12:34 PM
Administrator Personal Page Personal Album Project Albums Posts: 7043 Comments: 6 Joined: 03/26/05	Jerry - If there is a poor electrical connection, the engine may not get the minimum voltage to start. While it may turn over and sound fine, no start. Can't hurt to check. 1992 Outrage 17 I 2019 E-TEC 90, Viper 17 2+ 2018 Load Rite Elite 18280096VT
WhalerDan	#9  Posted on 06/03/09 - 1:05 PM
Member Personal Page Posts: 245 Comments: 1 Joined: 11/13/05	maybe you have a vapor lock issue and need a carb adjustment
In2Deep	#10  Posted on 06/11/09 - 6:21 AM
Member Personal Page Posts: 177 Comments: 0 Joined: 08/14/08	Just an update,I changed the fuel filters which seemed to help the starting problem. The next weekend I was out runnung 50% throttle and the motor started clanging and making squeaking sounds,loss of power! So I shut it down and will trouble shoot it this weekend.I ended up limping back on the other motor,thank God for 2 motors.
theo	#11  Posted on 06/11/09 - 8:50 AM
Member Personal Page Posts: 252 Comments: 0 Joined: 08/26/08	In2Deep wrote:. . . the motor started clanging and making squeaking sounds . . . Sounds like a wrist pin or a bearing has given up the ghost. Trouble with a capital T. I feel for you. Edited by theo on 06/11/09 - 8:52 AM Ted 1985 15' CC, 1994 60 hp Merc (Wednesday built), 5" jack plate
In2Deep	#12  Posted on 06/13/09 - 8:12 PM
Member Personal Page Posts: 177 Comments: 0 Joined: 08/14/08	Exactly,spun a bearing,now do rebuild ? sell the boat? The compression was 100/110/110. Not that bad,and the motor is immaculate,Im just not a fan of rebuilt motors. I question their reliability and longevity?
theo	#13  Posted on 06/15/09 - 10:04 AM
Member Personal Page Posts: 252 Comments: 0 Joined: 08/26/08	I don't have any experience with rebuilt outboards. I've rebuilt a few automotive engines with good success. And being inquisitive and something of a cheapskate, if I had the time I would probably tear into that old Yamaha and see what I could do. But, as you know, it's an arm and a leg to have a mechanic do it for you, especially for anything that says "marine" on it. Can you afford to repower with a new, dependable, single outboard? Maybe add a kicker later for peace of mind? Did I hear you say "sell the boat"? Blasphemy! Ted 1985 15' CC, 1994 60 hp Merc (Wednesday built), 5" jack plate