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Forum: Engines & props

20 July 2021, 17:22

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

Removed 5L of mix from the tank and diluted the...

Removed 5L of mix from the tank and diluted the remainder down with 5L of fresh fuel.

By my estimate the tank is now about 80:1.

I'd already topped up the 25L tank on Sunday morning with...

Forum: Engines & props

20 July 2021, 13:43

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

Carb back on and its running fine. More blue...

Carb back on and its running fine. More blue smoke than I'd expect and when it cools down I'll check the plugs again.

It doesn't smell of fuel when running so I'm not convinced it's over fuelling.

Forum: Engines & props

20 July 2021, 13:40

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

I assumed this originally but scouring the...

I assumed this originally but scouring the Internet seems to be quite adamant that it's 50:1.

I've not found conclusive proof other than the latest ones are 100:1. Mines a 1990 Yamaha model.
...

Forum: Engines & props

20 July 2021, 11:47

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

Worth trying. I've got the carb off at the moment...

Worth trying. I've got the carb off at the moment and I really think it's running rich.

Everything seems very clean and I've not yet found anything to suggest an issue but I can't find the tool...

Forum: Engines & props

20 July 2021, 10:43

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

I tried the 'little bit of choke' trick last...

I tried the 'little bit of choke' trick last night with no joy but not again since replacing the plugs. I'll do that now.

My father kept the ultrasonic bath from his shop and it's large enough...

Forum: Engines & props

20 July 2021, 10:14

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

That's one of my schools of thought. I'm in...

That's one of my schools of thought.

I'm in the middle of ordering a thermostat and diaphragms to rebuild the pump so that I can eliminate those and they should be done anyway given the age of...

Forum: Engines & props

20 July 2021, 09:35

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

New plugs in. Starts instantly, ticks over...

New plugs in. Starts instantly, ticks over smoothly now I've dialled the mix in and wound it back out to a point of smooth running. It revs up well.

Put it in gear and it idles well, any throttle...

Forum: Engines & props

20 July 2021, 09:24

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

I'm also going to do another compression test as...

I'm also going to do another compression test as the oily plugs could be due to more serious issues which would be a big blow.

Forum: Engines & props

20 July 2021, 09:21

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

It doesn't cut immediately. It's very much like...

It doesn't cut immediately. It's very much like an old B movie over actor. You know it's going to die but it takes it's time and makes a bit of a song and dance about it.

I've just returned with...

Forum: Engines & props

20 July 2021, 07:27

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

Yup. Good idea. I should have replaced it anyway...

Yup. Good idea. I should have replaced it anyway when I bought the engine so I'm going to order a couple and some fuel filters and change those regardless.

Forum: Engines & props

19 July 2021, 19:50

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

The problem is keeping the engine from stalling...

The problem is keeping the engine from stalling at idle.

I'm hoping that a set of new plugs tomorrow will bodge it back running so I can play with the idle and assure myself it's correct.

If...

Forum: Engines & props

19 July 2021, 18:58

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

Again! Are you suggesting I should have done the...

Again! Are you suggesting I should have done the carb strip and clean properly the first time? ;)

Forum: Engines & props

19 July 2021, 17:57

Replies: 21

Yamaha 15hp 2 stroke won't idle

Views: 7,113

Posted By TmMorris

Yamaha 15hp 2 stroke won't idle

I've a new to me but 90s 2 stroke 15hp.

I've reconditioned the gearbox and impeller. Compression on both cylinders is 120. In test the engine has been starting and running beautifully.

I...

Showing results 1 to 13 of 13

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