Yamaha 9.9 High Thrust 4 Stroke Electric Start

gump218

Cadet
Joined
Mar 27, 2004
Messages
16
My 9.9 routinely has starting problems due to what I think is low voltage. Once I clean electrical connections, she kicks over fine.... Does a 9.9 4 stroke electric start provide any charging to the battery when running?<br /><br />Also, I get a good idle and seem to get good high speed but there is a point where the engine tries to stall out during acceleration. If I milk the throttle, I can get thru that zone to high speeed. Ideas?
 

gump218

Cadet
Joined
Mar 27, 2004
Messages
16
Re: Yamaha 9.9 High Thrust 4 Stroke Electric Start

This is a 1995 T.9.9EXHT 6G8UL 787273
 

ST

Petty Officer 2nd Class
Joined
Jul 25, 2005
Messages
192
Re: Yamaha 9.9 High Thrust 4 Stroke Electric Start

The 1986 9.9 Yamaha service manual shows it has a "CDI magneto" charging system made by HITACHI. It says: "Lighting voltage: 10V or more at 3000rpm; 15+/- 1.5V at 5,500 rpm". <br /><br />If I am not mistaken; my motor develops a reading of 14V or so when I ramped up the rpm higher than idling.
 

gump218

Cadet
Joined
Mar 27, 2004
Messages
16
Re: Yamaha 9.9 High Thrust 4 Stroke Electric Start

Guess I can throw a meter onboard and take a reading while motoring... I'll check it out..
 

josef camilleri

Recruit
Joined
Apr 20, 2009
Messages
3
Re: Yamaha 9.9 High Thrust 4 Stroke Electric Start

Guys I am new here ,i am changing my engine for a 4 stroke yamaha or suzuki can anyone help please 150hp
 

gss036

Commander
Joined
Jan 18, 2003
Messages
2,914
Re: Yamaha 9.9 High Thrust 4 Stroke Electric Start

josef camilleri josef camilleri is offline
Cadet
You need to start a new thread/post and give more details on your boat and current engine.
 

Casco Bay Outrage

Petty Officer 2nd Class
Joined
May 31, 2006
Messages
112
Re: Yamaha 9.9 High Thrust 4 Stroke Electric Start

Gump -

Clean the carb for the stumbling. It is telling you there is gunk/trash. It will only get worse.
 
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