Notices

Replacing carburetor hoses Yamaha 40mshq

Old 11-14-2020, 07:22 PM
  #1  
Member
Thread Starter
 
Join Date: May 2016
Location: Smithville,Texas
Posts: 36
Received 1 Like on 1 Post
Default Replacing carburetor hoses Yamaha 40mshq

Ive replaced the intire fuel system up to the carburetors under cowling. Do I need to stick to OEM or can I use tygon or something else I can buy in bulk rather than spend $40 on 4 short hoses?
Also I just read in another thread that nkg plugs can cause damage. Is there anything to that. Yamaha recommends nkg ?
Just thought Id ask. Ive posted so much about this motor. I wouldnt have gotten near this far without you guys. Ive learned a lot.

Last edited by Douglasdzaster; 11-14-2020 at 07:32 PM.
Old 11-15-2020, 02:08 PM
  #2  
Member
Thread Starter
 
Join Date: May 2016
Location: Smithville,Texas
Posts: 36
Received 1 Like on 1 Post
Default

Some one please give me some input. The main reason I ask was I already have a few sizes of tygon hose from other things I’ve repaired. I really appreciate any thoughts. I do not want to do anything dangerous.
Old 11-15-2020, 02:26 PM
  #3  
Admirals Club Admiral's Club Member
 
Join Date: Nov 2008
Location: Somewhere in the middle of Michigan
Posts: 10,569
Likes: 0
Received 1,333 Likes on 714 Posts
Default

There are Tygon formulations that are used to make marine fuel hoses. If that is the type of tygon tubing you have, go for it.
Amazon Amazon

NGK plugs can be a problem if used in outboard motors designed for certain Champion plugs, like my 1991 Johnson 2-stroke. If your outboard manual lists an NGK plug as an acceptable plug, then there should be no problem using NGK.
Old 11-15-2020, 03:27 PM
  #4  
Member
Thread Starter
 
Join Date: May 2016
Location: Smithville,Texas
Posts: 36
Received 1 Like on 1 Post
Default

Thank you so much. I know it’s good for 2 stroke but I don’t know about marine. Better safe than sorry. I appreciate the link as well. That still gives me a savings of over half.
Old 11-16-2020, 02:11 PM
  #5  
Senior Member
 
Join Date: Mar 2009
Posts: 2,189
Likes: 0
Received 573 Likes on 366 Posts
Default

I have been using NGK plugs in my 2 stroke yamaha outboards since 1985. No issues.
Old 11-16-2020, 03:06 PM
  #6  
Member
Thread Starter
 
Join Date: May 2016
Location: Smithville,Texas
Posts: 36
Received 1 Like on 1 Post
Default

I went back and looked and it was a Johnson . They recommend champions. Our Yamahas are NKG. My bad for being a worrier.
Old 12-04-2020, 07:48 PM
  #7  
Member
Thread Starter
 
Join Date: May 2016
Location: Smithville,Texas
Posts: 36
Received 1 Like on 1 Post
Default

Update: I ordered the oem fuel lines for under the cowling. I’ve got one more question. I’ve replaced the hose and all fittings from tank to motor. Size 5/16”. Also installed a 10 micron fuel water separator. When I install the new lines under the cowling (1/4”) there is a clear inline screen filter ( not oem) I’d like to keep but worry about fuel restriction. I don’t know if the fuel pump has a screen since the manual tells me it came with an inline filter from Yamaha. Am I good with just the separator or should I keep the inline as well? Again thanks for all the help and advice on getting the maintenance caught up on this boat.
Old 12-19-2020, 11:18 AM
  #8  
Senior Member
 
Join Date: Feb 2017
Location: New Jersey
Posts: 207
Likes: 0
Received 25 Likes on 21 Posts
Default

Typically there is an in-line fuel filter before the carbs and it would be good to replace since you did the whole fuel system. A good source for parts is boats.net. You can view schematics to see if that filter is an OEM set up.
Old 12-19-2020, 02:41 PM
  #9  
Member
Thread Starter
 
Join Date: May 2016
Location: Smithville,Texas
Posts: 36
Received 1 Like on 1 Post
Default

Thanks for the input. I just received the OEM filter and will be installing it.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.