Yamaha me420sti inboard won't pass 1800rpm - help pls!

[Shane20211]

Hi I have a Yamaha me 420sti osprey she won't go over 1800 rpm and can't find any issues can any1 help

[Shane20211]

I have ansprey with a yamaha me420sti and won't go over 1800 rpm can any 1 help please

[Shane20211]

Can any 1 help me my me 420 still won't go over 1800 rpm

[yam man]

Have you changed fuel filters ? . Check the fuel feed in tank is clear ?

[beamishken]

Need more info to help could be a filter or could be a shagged engine and 100 things inbetween

[Shane20211]

To be honest I'm posting this problem for my dad he owns the boat as far as I know he has checked every thing that he knows he is a mechanic him self and has changed all filters and seals not unless we are missing sumthing it's running fine other than it won't give full power turbo not kicking in or sumthing in dat lines but turbo was checked and all fine

[phoenixpete]

What they are saying is you need to start your own thread from scratch not post on someone else's. Yours is a different question.

[willk]

Originally Posted by phoenixpete

What they are saying is you need to start your own thread from scratch not post on someone else's. Yours is a different question.

And here we are!

[phoenixpete]

Originally Posted by willk

And here we are!

[beamishken]

Is the hull clean?
Has the prop been changed recently
Is this an old installation or a recently fitted engine
Has it ever performed well and what was max rpm when it was running well
Does it chuck black smoke out when its trying to get on the plane?

[Shane20211]

Ok sorry lads don't know where I'm posting

[Shane20211]

No all is good with boat prop and every thing and all fully servieed would der be any sensors or relays dat can stop dis

[beamishken]

Very little in terms of sensors so shouldnt be too hard
If its definately 420sti then is has a boost pressure controller in the hard pipe behind the intercooler its secured to the outlet of the intercooler by 4 x 10mm nuts just above the belhousing operated by a capiliary pipe tapped off the solid pipe these can stick and prevent boost
Check its free and operating
Note the 421 doesnt have the boost controler and will just have a square blank in place

[Shane20211]

All checked and all new filters fuel thank cleaned out

[Shane20211]

It's defently the 420sti but will check that out thanks will get back to you soon if fixed but if u have any other info would greatly appreciate it thanks again

[beamishken]

I've repaired lots of them if you want to pm me im sure it wont be too difficult to sort