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Forum: Engines and Propulsion Systems 08-08-2019, 21:59
Replies: 8
Views: 2,224
Posted By Compass790
Re: Yanmar SB12 Rebuild Follow Up

Homer take Wotnames advice as he knows that pump whereas our YSM8 pump is quite different. My advice is limited to the spring problem only.
He rebuilt his injection pump so he knows the quirks...
Forum: Engines and Propulsion Systems 08-08-2019, 15:23
Replies: 8
Views: 2,224
Posted By Compass790
Re: Yanmar SB12 Rebuild Follow Up

Yes I was going to add a 2nd spring too but it wont be a yanmar one.
Yanmar singles can rattle your fillings out alright but you just have to find the sweet spot & then they are not too...
Forum: Engines and Propulsion Systems 07-08-2019, 22:19
Replies: 8
Views: 2,224
Posted By Compass790
Re: Yanmar SB12 Rebuild Follow Up

Whoops CORRECTION: Forgot you were using mono 30 oil, in that case 20w-50 or 25w -70 will be no harder to crank when cold.
Mono 40 will be harder though.

Wotnames post about the linkages is a...
Forum: Engines and Propulsion Systems 07-08-2019, 19:56
Replies: 8
Views: 2,224
Posted By Compass790
Re: Yanmar SB12 Rebuild Follow Up

I don't have a copy of the SB12 w/shop manual so don't know if it's the same governor setup as our ysm8.
All I can tell you is the spring tension is important on the linkages. I think on ours the...
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