6 replies to this topic

[blade_47714]

i have a 95 speedster with twin 85s .it seems like when i put a load on the boat on take off at full throtle one engine is taching out alot higher than the other one.its like its spininning out or something.could this be cavatation or is it maybe a drive shaft. i had the pump rebuilt last season with a new wear ring.it revs to about 7000 and one is about 4000.when i was drive at full speed sometimes it would tach way up bye itself and i would have to pull back on the throttle to even it up with the other one.i hope someone else has had this problem please let me know the solution before i rip this thing down thanks.

[tiggerman]

Definitely cavitation. Read in on some of the posts here and find out other things to check. Your boat has a different driveshaft seal than the later models, and actually should seal better than ours. If your wear rings are new, the next best place to check is where your pumps seal up at the hull. The '95 models used alot of black RTV silicone I think. Make sure they are sealed up really well. Also make sure the impeller isn't nicked up on the edges. Pull the pump and visually inspect it. That way, you can seal it up right. Look at the first two pics here: http://seadoosportbo...p?showtopic=110
Notice the gobs of silicone. That is where the pump mates up to the hull.

[tiggerman]

I'm actually wrong about using the silicone. The boat came with neoprene seals for the pump to hull seal. You could use neoprene weatherstripping (3/8"x3/16") to seal that up. Use an o-ring for the water intake (the little hole at the top of the photos)..

[blade_47714]

I'm actually wrong about using the silicone. The boat came with neoprene seals for the pump to hull seal. You could use neoprene weatherstripping (3/8"x3/16") to seal that up. Use an o-ring for the water intake (the little hole at the top of the photos)..

so i shouldent use silicone at all.and does the ride plate on the bottom have to be sealed all the way up

[blade_47714]

I'm actually wrong about using the silicone. The boat came with neoprene seals for the pump to hull seal. You could use neoprene weatherstripping (3/8"x3/16") to seal that up. Use an o-ring for the water intake (the little hole at the top of the photos)..

if it was the drivw shaft it wouldent turn at all would it.

[tiggerman]

In answer to your questions, I would try to seal up the pump with the neoprene. Use silicone only as a last resort. It is messy, and hard to get out of the groove where you would put it. If your driveshaft was stripped in the splines, it would sound like something coming apart. The symptoms you describe are classic of cavitation.

[blade_47714]

In answer to your questions, I would try to seal up the pump with the neoprene. Use silicone only as a last resort. It is messy, and hard to get out of the groove where you would put it. If your driveshaft was stripped in the splines, it would sound like something coming apart. The symptoms you describe are classic of cavitation.

thanks i will try to seal it all up