engine overheating and not getting up on plain

[hondakillrsx]

Hey guys I've got yet another problem now (pretty soon I should have just about everything replaced). So this problems seems to have gotten steadly worse and worse over the last few trips. What happens is the boat will not plain out, it tries to but just doesnt seem to get the prop spinning at a fast enough RPM to get up, then after a few minutes of putting the load of trying to plain out on the motor it over heats.... I'm not a boat mechanic by any means but it seems like it has to do with something in the lower unit or prop. The reason I say this is the engine itself runs fine and revs up great like it always has. I checked the compression on both cylinders and its reading perfect at 150 on both cylinders. I don't notice any binding in the lower unit when its in neutral but i will say that the bottom piece of the lower unit that guards the prop from smacking the ground is broke off and I've hit the prop more times then I can count so I'm thinking something is off in the lower unit or maybe the prop is screwed.... Any help would be huge. I found a used lower unit on ebay for a 160 bucks but its a long shot that that would work. Has anyone else had this problem? I could be way off here so please throw your two sense in, I'm all ears...

Lane

 

[1983rinker]

Re: engine overheating and not getting up on plain

hows the impeller??

 

[hondakillrsx]

Re: engine overheating and not getting up on plain

Just replaced a couple weeks ago because we thought that's why it was overheating.

 

[1983rinker]

Re: engine overheating and not getting up on plain

and it spitting out water when it running?

 

[hondakillrsx]

Re: engine overheating and not getting up on plain

Yup, I added a tell tale, the water streams out, is it possible that the tell tale is taking too much water?

 

[1983rinker]

Re: engine overheating and not getting up on plain

ya, close that up and let it come out the right way. You are not letting the water do it work to cool it motor. When you give it gas the motor get hotter so it needs more water. And your water is shootting out before it can go all around the block. Try this I bet it will work. Take the tale off.

 

[1983rinker]

Re: engine overheating and not getting up on plain

and you may have to replace the inpeller agin.

 

[1983rinker]

Re: engine overheating and not getting up on plain

the tale look cool, but not ment for these motors.

 

[hondakillrsx]

Re: engine overheating and not getting up on plain

This might help it but it started before I put it on. It just got worse after, would the reason why it can't get on plain be because its over heating?

 

[1983rinker]

Re: engine overheating and not getting up on plain

is you lower unit full of greese?????

 

[1983rinker]

Re: engine overheating and not getting up on plain

how the thermostat?? test that??

 

[hondakillrsx]

Re: engine overheating and not getting up on plain

Should be, ill make sure tomorrow.

 

[further]

Re: engine overheating and not getting up on plain

Spun prop hub? I've been runnin a tell tale for a while now with no adverse effects. I would try another prop before any thing else.

 

[1983rinker]

Re: engine overheating and not getting up on plain

Its a water problem.

 

[1983rinker]

Re: engine overheating and not getting up on plain

what size is you motor??

 

[hondakillrsx]

Re: engine overheating and not getting up on plain

50 horse. Could the prop make the motor overheat though?

 

[metor99]

Re: engine overheating and not getting up on plain

Hi
Your boat will not plain out because of the pitch / size of your prop. I has nothing to do with your motor getting hot. Also your tale-tale has nothing to do with it getting hot either unless you have a 1/2 line or bigger to your tale-tale. If your pump is working properly you can dog these motors.

1. look for spun prop. Borrow someone elses prop.
2. change pitch of prop lower pitch means you can pickup a load but not go as fast.
3. check thermostat, impeller and an obstruction in the water ports.

 

[hondakillrsx]

Re: engine overheating and not getting up on plain

ok, now I'm pretty set on it just being a engine problem, nothing to do with the lower end. The motor sounds really different when I gas it, kinda like deeper noise. Plus it is releasing ALOT of gas out the exhaust. I'm pretty certain whatever is making the gas come out is making it run this bad and overheating. does anyone have any suggestions as to why I would have so much release of gas? I checked the compression and both cylinders are at 150.

 

[BuzzStPoint]

Re: engine overheating and not getting up on plain

Running rich wont overheat your engine.. Running lean can.

Remove the tell tale.
Take the thermostat out completely. Put the cover back on.
While the thermostat is out, get a pan of water. put the thermostat in the water and start heating it on the stove. Have a thermometer handy so you can measure the temp, when it opens, write that temp down. Compare to what temp stat you have.

Keep thermostat out of engine.
Test the motor in a barrel. Do you have water spitting out the exhaust spout?

If you have a spun prop, your motor will spin at a higher RPM and your boat wont move as fast. (Prop hub spinning, but blades not spinning at the same speed)

Wrap a belt around the flywheel. Have someone hold the flywheel and see if you can turn the prop by hand, If you can spin the prop without turning the engine, more then likely your prop is shot.

Carbs.
Turn the idle air screws in till they bottom. Back out 1 1/4 turns.