Yamaha 85

matt h · 29 November 2006, 17:29

probally a bit late but just done a deal on an Yam 85 two stroke on Boats and outboards, (fitted the financial bill for now)supposed to be a 1995, with full history and one owner, and on Fresh water lake, are these engines ok, ??? what mixture ratios etc?? and input will be valuable!! thanks chaps!!

Neil Harvey · 29 November 2006, 18:08

Hi Matt,
got a yam 90 on my searider and it's great, about 1992 I think.
Don't see any reason why the 85 should be any different, yammies are renowned as being quite bomb proof and very well built.

re mixture ratio - is it not injection?

good luck with it

Neil

Nos4r2 · 29 November 2006, 18:14

Quote:

Originally Posted by matt h

probally a bit late but just done a deal on an Yam 85 two stroke on Boats and outboards, (fitted the financial bill for now)supposed to be a 1995, with full history and one owner, and on Fresh water lake, are these engines ok, ??? what mixture ratios etc?? and input will be valuable!! thanks chaps!!

Mixture's 100:1 on most Yams if it's not oil injection but I'd personally run it at 50:1-75:1

matt h · 29 November 2006, 18:54

should it be oil injection for a 95 engine?? or do some people just mix it in the tank for reliability??

Nos4r2 · 29 November 2006, 20:23

Has it got an oil tank or oil pump?

I'll guess it should be autolube at that age. Some people don't like any autolube systems and remove them though.

matt h · 29 November 2006, 20:34

the chap said it was a pre mix!! have a look, its on Boats and outboards! even so, i think it a good engine and will last reliably for a while,

Nos4r2 · 29 November 2006, 20:48

Premix is safer as long as you can work out the right numbers anyway. He'll know the correct mix when you collect it.

Can't see any obvious fittings to suggest autolube in the pics...

Pete7 · 30 November 2006, 14:23

90s were oil injection, the 85s are pre mix, but based on the same engine. Our club dive boat has an 85 pre mix. I first saw the engine in 91 and it wasn't new then. Since that time it has spent 10 years on a dive school rib and the remainder with us being totally neglected and only maintained when it stopped (club politics/funds etc). With regular maintenance and good fuel they should run like a well ollied sewing machine. Superb choice.

Pete

matt h · 30 November 2006, 19:10

spoke to Yamaha technical today, (very helpful) and he confirmed it was a 93 model, AETL, he reckoned the engines were superb, should it have oil injection?? can it be put on??

Pete7 · 30 November 2006, 19:46

Not without a shed load of work. Mercs/mariners and Envirudes/Johnsons mix the oil with the fuel then pass it through the carbs. Yamaha and Suzuki inject it into the block separately from the fuel. Therefore keep it on premix.

Pete