superjet

[Novak p]

I.have a 1991 superjet with cofeman pipe my ski isn't going.faster.than five mph and minimal water coming put the pisser from pipe any suggestions?

 

[DAG]

What was the last thing you changed before it started running poorly?
Pull spark plug and check compression.

 

[tor*p*do]

blown pump seal?
getting a lot of vibration?
does motor rev up?

 

[Novak p]

I ran a new oil and it was ok foe 20 minutes than its as just real slow and can't go past five

 

[Novak p]

So I dumped the gas put new gas and same oil as I usually run

 

[Novak p]

I was thinking possible pump seal maybe even blown head gasket.

 

[Flight Risk]

I was thinking possible pump seal maybe even blown head gasket.

It it probaly getting hot and it has a sensor that cuts power.

 

[tor*p*do]

check the cooling line from the pump
may be a blockage or pebble in an L on the incoming water line causing overheating

 

[Novak p]

I blew thru all the lines.didn't find a blockage

 

[Flight Risk]

I was thinking possible pump seal maybe even blown head gasket.

It it probaly getting hot and it has a sensor that cuts power

I blew thru all the lines.didn't find a blockage

Do you have stock head

 

[Novak p]

Ya

 

[Flight Risk]

it could also be an exhaust leak. Fills engine compartment with carbon monoxide.

 

[Novak p]

If it wasn't exhaust leak wouldn't carbon built up inside like black dust

 

[Flight Risk]

If it wasn't exhaust leak wouldn't carbon built up inside like black dust

Not so much . Ride it then pull hood off you will see it filled with exhaust gas

 

[Novak p]

Like fuels?

 

[Novak p]

Fuems

 

[Flight Risk]

that little rubber piece on the top of the head with th wires attatched is the sensor.it reduces power to the motor when overheating but keeps running to not leave you stranded

 

[Flight Risk]

yes fumes

 

[Novak p]

Ok I'm.gonna.check the compression as well

 

[jetpilot36]

if you don't have water coming out of the pisser, then that's the root of the problem. like others have said, that's causing your engine to overheat and if you're still using the temp sensor in the head, then its reducing power. you gotta figure out what causing the water problem. pull spark plugs and see if they have water on them. hit the starter button without the plugs in the head.