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  #1  
Old 08-22-2005, 05:22 AM
Surfer Surfer is offline
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Join Date: Sep 2004
Boat: MC PS 190 1995, 350 cid. injection, 275 hp, 1:1, 4-blade prop.
Location: South Finland
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Lower top speed?

Hi,

just noticed last week my MC Pro Star 190 (, 1995, 1940 hours) top speed is 6 MPH less than it is used to be. Earlier 42 MPH, now 36 MPH.

The boat was about two weeks not used in the harbour. Engine works just like normal otherwise.
Normal spring maintenance was done in May.
I wonder if it could be flame arrestor being not so clean, something with transmission, ie. the prop axle joint tightness, antifriction bearing (of which two I do not know much about), or something else.
Anyway I am going to check and clean the flame arrestor.
Also if the green stuff on the hull, can it cause that much?
I am not sure if the speedo show's correct?
They were calibrated with gps just a month or so, ago.

I can verify this speed by barefooting: long line one foot almost impossible.

Other question: the manual tells to change oil every 50 hrs, which is close now, but the oil is still very clean, so any point? Except, it could be good to clean the hull at the same point.

Thank you for any answers!
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  #2  
Old 08-22-2005, 06:53 AM
jimmer2880 jimmer2880 is offline
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Boat: 95 PS 190 EFI
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I bet it's the fuel pump. Actually, it may only be dirt in the fuel pump. In 95, fuel went from the tank into the pump (located on the lower passenger's side rear of the engine compartment), then into a fuel filter (hard metal), then into the throttlebody.

step:

1) shut off fuel at the tank (pull the rear access panel & rotate shut-off valve
2) Pull the pump out (need to be a midget contorsionist standing on your head)
3) remove the adapter fitting on the pump where the fuel-line entered the pump.
4) check the screen on the pump for debris.
5) clean pump, re-install
6) install cheap-o fuel filter in the soft rubber line before the pump.

If there isn't any debri in the pump, a new pump is $270.00 from www.skidim.com. I will sell you a used one for $100.00 + shipping that I guarantee will work.

hope that helps....
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  #3  
Old 08-22-2005, 07:35 AM
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MarkP MarkP is offline
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I would start by cleaning the hull. You will pick up speed.

I’m going to guess you should change the oil (before) it is dirty..

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  #4  
Old 08-22-2005, 09:44 AM
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G-man G-man is offline
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Boat: SN 196 previous 93 stars&stripes 190 red
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I would clean the bottom, with our temps here water in the high 80's you ger the start of growth in 24hrs.
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Last edited by G-man; 08-22-2005 at 10:47 AM.
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  #5  
Old 08-22-2005, 10:18 AM
Leroy
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Guy told me Sat he loses 10 MPH topend due to the build up on his hull.
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  #6  
Old 08-22-2005, 10:20 AM
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east tx skier east tx skier is offline
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Welcome, Surfer. I'd also suggest that, if possible, after you clean the hull, put a coat of wax on there, too.
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  #7  
Old 08-23-2005, 04:50 AM
Surfer Surfer is offline
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Join Date: Sep 2004
Boat: MC PS 190 1995, 350 cid. injection, 275 hp, 1:1, 4-blade prop.
Location: South Finland
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Hi!

Thanks for the reply all.
1. Hull cleaning.
2. I will check check the pump.

I did change this spring the filter before the pump (the one with nuts, and on a metal fuel line). I did not get the filter (the one on top of fuel tank on rubber lines) from the MC dealer (MC UK).
Anyway this filter, I did change, stops smaller particles.

As far as I know there are two filters before the pump, referring to a earlier discussion in this site: http://www.tmcowners.com/teamtalk/sh...ht=fuel+filter

Thanks.
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  #8  
Old 08-23-2005, 06:46 AM
jimmer2880 jimmer2880 is offline
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Quote:
Originally Posted by Surfer
Hi!

Thanks for the reply all.
1. Hull cleaning.
2. I will check check the pump.

I did change this spring the filter before the pump (the one with nuts, and on a metal fuel line). I did not get the filter (the one on top of fuel tank on rubber lines) from the MC dealer (MC UK).
Anyway this filter, I did change, stops smaller particles.

As far as I know there are two filters before the pump, referring to a earlier discussion in this site: http://www.tmcowners.com/teamtalk/sh...ht=fuel+filter

Thanks.
on my '95 - there were none before the pump & 1 after. Now, I put one before & removed the one after. Perhaps someone before you already had the pump problem & had the one before the pump installed?
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  #9  
Old 08-23-2005, 06:57 AM
Surfer Surfer is offline
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Join Date: Sep 2004
Boat: MC PS 190 1995, 350 cid. injection, 275 hp, 1:1, 4-blade prop.
Location: South Finland
Posts: 48
Hi,

I am not totally sure if the filter I did change is before the pump.
Anyway I am going to check this issue today.
No pressurization needed? Or new seals?

Cheers.
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  #10  
Old 08-23-2005, 07:02 AM
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André André is offline
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Is the engine running fine at 3600 rpm ?
If it's a fuel issue,the engine should bog when at full throttle...There's also a screen at the inlet of the pump...http://www.tmcowners.com/teamtalk/sh...oisy+fuel+pump
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