Overheat alarm

[Deleted]

Hi guys,

Put the boat in this morning to take the granddaughters and wife
for a little boat ride for the first time ever there were no rods
and reels on board.
Engine started immediately, headed down the river, I was running around 4000 RPMs, when I got to the wide part of the river, I throtled up to about 4500-4800 RPMs, after a minute or so
an alarm went off and the engine started running rough and I pulled back on the throttle, checked the pee trail and it appeared to have plenty of flow, the alarm stoppped.

I slowly idled back up to 3500 RPMs and it ran fine, I began to push it up to 4000 and then to 4500 RPMs while glancing back at the pee trail, the alarm sounded again and I throttled back.

Waited a minute at idle, the alarm stopped, told the crew I would
feel a lot better if we headed back to the dock. Cruised back to the dock at about 4000 RPMs with no problem.

The pee trail seemed to have a strong stream, but from all
indications I was getting an overheat alarm.

I don't normaly run at or over 4500 RPMS, but have at times
just to try WOT.

Is it possible that because of weight distribution
of the extra people and gear (purses, drinks, sandwiches,
toys, ...etc) in the front causing the boat to plow and
putting extra load on the motor that caused the overheat
alarm.

Or should I just face reality and say well I guess I need a
new impeller.

Oh yeah, 170cc seapro with 1999 yamaha 90 2 stroke.

Any help, opinions, comments, and/or smart azz remarks are
welcome. ;D

[ejstenger]

seapro52, I had the same thing happen to me a couple of years back and by the time I got to the dock the squirter wasn't. I had to replace the water pump impeller and that fixed it. Seems that Yamaha put in impellers that had a plastic insert and they come loose and spin on the insert, replaced my impeller with one that had a brass insert and has been running well ever since. I have a1999 190DC with Yamaha 115 two stroke. Hope this helps. <`)>((((< ED

[Simple Man]

My moneys on the water pump. Sounds like your not getting the volume of water needed to cool the motor at higher load conditions.

[Deleted]

Thanks guys,

I went fishing with a buddy today and told him about it.
He said he had the same thing happen to him before,
he said sometime when we are not fishing, I'll help you
replace it. ;D

IBoats has an impeller for $18 and the water pump repair
kit for $30.

He said all need is the impeller, Do y'all think I should I go
ahead and spring for the water pump repair kit with the
impeller, housing, gaskets, and O rings?

Thanks.

[ejstenger]

seapro52, I would spring for the repair kit. get it right the first time since it is a '99 and getting some age on it. Make sure you get an impeller with the brass insert. Helps to have a buddy that is willing to help too. <`)>((((< ED

[Simple Man]

X2.
Unless you have replaced it in the last three years. Your buddies probably right but I've always been a little anal about things like that. For the difference in money its worth it to me just for peace of mind and knowing what you have got.

[Deleted]

Ordered the kit today, thanks for the input.

[ejstenger]

But did it fix it, Let us know. <`)>((((< ED

[Deleted]

Sorry I should have posted before now.

ED, the answer is yes and no.

My buddy and I attacked the water pump, but when removing
the WP housing one of the bolts broke off. We tried screw
removal bits, then drill and tap a new thread, all to no avail.

Finally just took it to my trusty mechanic, who I have been
dealing with for 20 years, and apologized for not bringing it
to him in the first place. He was able to drill the bolt and
used a heli-coil insert to repair and rethread the hole.

Cost me a couple extra Franklins but it seems to be
working fine now, at least in the driveway.