I need help

[storm 22]

I have a brand new Hydro tec motor it dynoed 342hp according to HT here is the problem my stock 250 ox66 yamaha ran 81-82 loaded then I got a 300x and went 88-89 loaded so I bought this motor and went backwards it only runs 77-78 loaded it is the same prop and load that I ran with the 300x the 300x ran 5900-6000rpm at 88-89 this motor can only turn the same prop to 5400-5500 and 77-78 mph had it checked by the local yamaha marina no cods and every thing checked out the compression is 135 on 5 and 136 on the other one any help would be great please dont say I should have kept the merc only respond if you can help thanks

[spider1]

Sounds like a fuel problem.

[storm 22]

that is what wyane and I thought but it checked out fine it gotta be something simple it runs strong up to about 4500 then falls of

[spider1]

Have you checked the medium pressure fuel pump pressure?

[storm 22]

how do you check the medium fuel pressure pump

[spider1]

If you look on top of the SVT tank there is a bicycle tire valve. Connect a 100 psi pressure gauge. turn on the key but do not start the motor. Your reading should be around 50psi. Turn key off and it should be about 40psi after 5 seconds.

One of the problems with mine was it would not reach pressure and would drop off to fast. It was an o-ring that needed to be replaced

The best thing is have the tech with his laptop as you run it wot across the lake.

[storm 22]

they checked the press. and said it was ok but I gotta get this figured out or it will go back to HT for them to figure out

[spider1]

Taken it to HT may be the fastest way to get it right.

[blair]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spider1 &raquo;</TD></TR><TR><TD CLASS="quote">Taken it to HT may be the fastest way to get it right.</TD></TR></TABLE>


+1000


Sent you an IM, Steve

[spider1]

Storm I wish I would have done that 11/2 years ago!!