Douglasdzaster

I’ve 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 I’d ask. Ive posted so much about this motor. I wouldn’t have gotten near this far without you guys. I’ve learned a lot.

Douglasdzaster

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.

yarcraft91

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.

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.

Douglasdzaster

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.

muskrattown

I have been using NGK plugs in my 2 stroke yamaha outboards since 1985. No issues.

Douglasdzaster

I went back and looked and it was a Johnson . They recommend champions. Our Yamahas are NKG. My bad for being a worrier.

Douglasdzaster

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.

Peetee907

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.

Douglasdzaster

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