YSE8

[furdui]

YSE8 Manual Start

Hi,happy Yamaha 25 Mk2 owners,in particular happy Yamaha 25 Mk2 with YSE8 motor owners.


I intend to dismantle the manual starting system,precisely,the faulty pinion sprocket,which turns freely both ways.

Is there anyone who knows if the pulley nut has left or right thread? .

Please let me know,before I will apply the full(available to me)force to unscrew it!!

Thanks,

Simon

 

[furdui]

Re: YSE8 Manual Start

I decided to postpone this project,I'll be away for a month.When back,I'll start the engine and,I suppose,the way to unscrew the nut is the same with the direction of shaft rotation.
Other job I've done,replaced the water mixing elbow,found it complete stuffed with rust and rubbish,maybe 0.1 squre inch left open to pass exhaust and water,and consequently,with throttle more then half,the black smoke was comming out from exhaust pipe,and boat speed only 3.5 kn. After this the engine runs smoothly,like a brand new engine,well done,thanks.

 

[g5665]

Hi there

i guess that is also one of my problems... however i don't figure out how to remove the mixing elbow!!!
Mine it's connect very tight to a flexible pipe similar to this picture from JBSailsSD http://forums.sbo.sailboatowners.com/attachment.php?attachmentid=38720&d=1302010661

Have to remove all the pipes and attachments?

Thks

I decided to postpone this project,I'll be away for a month.When back,I'll start the engine and,I suppose,the way to undue the nut is the same with the direction of shaft rotation.
Other job I've done,replaced the water mixing elbow,found it complete stuffed with rust and rubbish,maybe 0.1 squre inch left open to pass exhaust and water,and consequently,with throttle more then half,the black smoke was comming out from exhaust pipe,and boat speed only 3.5 kn. After this the engine runs smoothly,like a brand new engine,well done,thanks.

 

[Bill Roosa]

Furdui
The only time I have seen left handed threads in production is on the passenger side of the old ramble. the only time you use left handed threads is with a (looking at the fastener wrench end) clockwise rotating device where the nut has proven to come off and there is no way to "wire" it on.
I'd bet on it being a right had thread.

G5665
Getting hoses off nipples is an art; some would say a black art. Without deluging all my secrets you should try first twisting the hose with a large set of pliers to break it free. Do not clamp down on the hose while doing so though as that just makes it harder to turn. See, black art!! Then you can wiggle (more black art stuff) the hose off. If you can/t get the hose to turn then try (getting the clearance is the black art in this technique) sticking a thin but very strong screwdriver between the hose and the nipple to break it free then back to the first technique.
The “always works” solution is to take a utility knife and run it from the beginning of the hose to the end of the nipple then use the screwdriver to pry the newly formed cut off. This does have the bad side effect of not being able to re-use the hose though so be fore warned.

 

[furdui]

1) loosen top hoseclamp,use a strong screwdriver and eventually a hammer to break the bond between elbow and exhaust hose(don't worry about small damage,the flow of water/gases is top to bottom and a bit of sikaflex291 will fix it when reinstalling) then push down the hose.
2) if there is enough room to turn the elbow(left hand thread!!!!!) turn it,making sure you have a wrench on adaptor/joiner and you do not apply any excess pressure on vertical manifold,then you can clean the elbow.
3) if not,unscrew three 8 mm bolts holding the vertical manifold on cyl. head(when i did it,i was pleasantly suprised how easy first bolt came out,but next two were 'tough guys',had to break them and spent two days(and almost my entire patience!!)to get them out with no need of redrilling).
i used a blow torch on elbow to help break bond between it and adaptor/joiner.
you may need to replace the old gasket.

attachment for reference

good luck

Hi there

i guess that is also one of my problems... however i don't figure out how to remove the mixing elbow!!!
Mine it's connect very tight to a flexible pipe similar to this picture from JBSailsSD http://forums.sbo.sailboatowners.com/attachment.php?attachmentid=38720&d=1302010661

Have to remove all the pipes and attachments?

Thks

 

[g5665]

Thanks for the detailed info... this weekend will bring the boat out and try to dive to check the propeller
Later when back to the marina will remove the elbow (will try i mean!!!)...

Thank you

1) loosen top hoseclamp,use a strong screwdriver and eventually a hammer to break the bond between elbow and exhaust hose(don't worry about small damage,the flow of water/gases is top to bottom and a bit of sikaflex291 will fix it when reinstalling) then push down the hose.
2) if there is enough room to turn the elbow(left hand thread!!!!!) turn it,making sure you have a wrench on adaptor/joiner and you do not apply any excess pressure on vertical manifold,then you can clean the elbow.
3) if not,unscrew three 8 mm bolts holding the vertical manifold on cyl. head(when i did it,i was pleasantly suprised how easy first bolt came out,but next two were 'tough guys',had to break them and spent two days(and almost my entire patience!!)to get them out with no need of redrilling).
i used a blow torch on elbow to help break bond between it and adaptor/joiner.
you may need to replace the old seal.

attachment for reference

good luck

 

[furdui]

you're right,it is right hand thread,the shaft turns anticlockwise

Furdui
The only time I have seen left handed threads in production is on the passenger side of the old ramble. the only time you use left handed threads is with a (looking at the fastener wrench end) clockwise rotating device where the nut has proven to come off and there is no way to "wire" it on.
I'd bet on it being a right had thread.