boston whaler rage jetboat problem

[H2OGuy75]

i have a 1994 boston whaler rage jetboat with an omc 115 engine. i ran it only once last summer, it had an overheat issue and i spent the rest of the season trying to get it resolved. the overheating issue is now resolved (by a mechanic), but now the boat won't run unless i continually press the choke on the key. it runs completely fine so long as i press the key ( about every 5 seconds ).

i have installed a new anti siphon valve, a new primer bulb, and some new fuel lines. the primer ball does act funny from time to time. the mechanic thinks that the carbs need to be rebuilt, but i took them off and looked and they look fine, like nearly brand new, so it doesn't seem like that's the issue.

i bought a bottle of sea foam and i was going to try that. does anybody have any suggestions on how to use the sea foam most effecitvely (i.e. right into the gas tank, or apply it other places?) or any other suggestions of what might be causing the issue?

 

[JustJason]

Re: boston whaler rage jetboat problem

Well, this needs to get moved to the OB forums. But.... first identify what kind of choke you have. If it is a plate style choke system. Then your richening the mixture by restricting air. If you have an enrichening system. Then your richening the mixture by adding fuel.

Either way... you need to test the boats fuel system first. Then more than likely rebuild the carbs, and sync everything up. Looking at the carbs won't tell you anything. It takes less than a grain of sand inside of 1 to get it not to run right.

 

[SKEETR]

Re: boston whaler rage jetboat problem

First ensure that the carbs are completely closed at idle before making any adjustments. Also, as I just discovered on my boat, check that the throttle cable is adjusted correctly so that the carbs do close all the way when in neutral. Some times it is the simple things that get overlooked.

Disengage throttle cable and loosen idle timing screw until it no longer touches stop(large flathead screw facing front on upper linkage arm)

Adjust the linkage by loosening the screw on the lower carb and with thumb pressure take the slack out of the linkage while re-tightening screw. Carbs should both be closed and operate in unison. Open carbs fully by moving shaft where throttle cable was and verify that carbs operate together and at full open the butterflys are parallel not beyond.

Close them again, now on the upper carb there is a roller that contacts the throttle cam. It should not be making contact with the cam. Adjust it so that it is just a hair before contact.

Tighten the idle timing screw so it touches the stop.

Start the engine. If the idle continues to stumble tighten the idle screw a bit more. In a driveway on the hose you want these engine/jets around 1400 rpm to overcome the gear backlash.

If you still can't get it to idle by doing the above your carbs are dirty and in need of rebuild kits and a good soaking.

 

[SKEETR]

Re: boston whaler rage jetboat problem

That primer bulb is not legal in that setup btw. You really shouldn't need it if your fuel pump is working correctly.

How far did the mechanic go when he resolved your overheat? Is your compression still ok?