It is currently Sep 22nd, '18, 17:56

All times are UTC + 10 hours [ DST ]




Post new topic Reply to topic  [ 2 posts ] 
Author Message
PostPosted: Apr 29th, '18, 19:17 
Offline
Midshipman
User avatar

Joined: Jul 13th, '08, 20:48
Posts: 15
Location: Melbourne
Has thanked: 0 time
Have thanks: 2 times
My scenario is:
- a Yamaha 8hp 2 stroke that has behaved reasonably well over the years- not sure the year of manufacture, but about 2004 or 2005
- used exclusively on Gippsland Lakes, and motor always flushed after use, and serviced every 3-4 years including changing impeller
- when used at Easter experienced problems- the water flow from the telltale slowed to a trickle, and exhaust smoke was emitting from the telltale hole;
- when revs increased, the motor seemed to 'suffocate', with exhaust smoke emitting from around the base of the motor, and it would stall unless revs backed off
- removed the cowling cover on the theory that would allow air to flow to the motor, and seemed to run a little better, but still not as per usual

Has been suggested to me that these Yamaha motors are prone to internal corrosion, and that this is likely problem

I came across the post below from MoodyBlue and wonder whether this may be my issue?

viewtopic.php?f=31&t=11241&p=122933&hilit=yamaha+8hp#p122933

Not being at all 'mechanical', I am not sure whether this is a case of approaching the motor's end of life, or whether there are steps that can be taken to restore the performance

Any thoughts or suggestions gratefully received.

Regards

All in Blue
sonata 26

_________________
All in Blue


Top
 Profile  
 
PostPosted: Apr 29th, '18, 20:44 
Offline
Able Skipper
User avatar

Joined: Mar 4th, '07, 11:02
Posts: 1136
Location: SE Melb
Has thanked: 132 times
Have thanks: 112 times
Dangar Marine/Dangar Stu's video, especially at 12 minutes 50secs. Good tell tale and water flow, occasional pulsing of the water because of exhaust gas getting in. https://www.youtube.com/watch?v=joEQChc ... mIRUO&t=0s

Either a blown gasket or corrosion. So a mechanic or yourself could pull it apart and have a look.

_________________
Northerner28.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC + 10 hours [ DST ]


Who is online

Users browsing this forum: Google [Bot], Majestic-12 [Bot] and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group