1987 suzuki dt 175

[jchomer]

My problem is when you throw the throttle full from dead still it jumps right on the rev limiter,,my other problem is ,my water temp buzzer on the right side is going off at idle but not when up on plane. Any help will be appreciated. THANK YOU<br /> John

 

[jim dozier]

Re: 1987 suzuki dt 175

Sounds like your prop is ventilating or your hub is slipping causing the engine to overrev and hit the rev limiter. Check for a spun hub and if not that check the trim angle and height of your engine on the transom. Has it always done this or did it just start? If the trim is up too high on takeoff or if your engine is mounted too high you will ventilate the prop and overrev the engine. What is your tach doing when this happens? <br /><br />It may be time for a new water pump impeller. Temp sensors have been known to be wrong but you need to check the block temp when the sensor buzzes to see if it is in fact overheating.

 

[jchomer]

Re: 1987 suzuki dt 175

both of these things just started.I think the impeller is good ,because water shoots out the tube real good even when trying to start. motor is alway down on take off so its not trimmed up to high.I am a rookie boater so how would i check for a spun hub?

 

[jim dozier]

Re: 1987 suzuki dt 175

There's a rubber hub which separates the inner splines and prop shaft from the outer propellor. When they get old they start to slip. Take a magic marker and mark a line across both and check the line for movement after the problem occurs. However, a spun hub usually is evident from about 2500rpm on up. It will grab at low speeds when there isn't much load but will slip when the load hits as the engine powers up. If yours slips and then catches later on we're dealing with something else.

 

[jchomer]

Re: 1987 suzuki dt 175

if i jump straight to full throttle is when i hit the limiter,if i ease to full throttle everything is fine.

 

[jim dozier]

Re: 1987 suzuki dt 175

Does it sound like its "popping" out of gear? Could be issues from the gearcase. From your last description it probably isn't a slipping hub. You probably wouldn't be able to get to WOT slowly or not with a bad hub. It might be worthwhile to test another prop if you can get one though.<br /><br />This is important, what is your tachometer saying when this happens. Do you actually see the rpms go high and bounce off the limiter? If not perhaps your impression of that is wrong and you are just dealing with a carb issue and a faltering engine.

 

[Steamboat]

Re: 1987 suzuki dt 175

Tried to post this earlier so if it shows up twice - sorry. Sounds like when he nails the throttle, the rpm's are building before he gets good water flow and the flow switch or temp switches are rev limiting the motor. The water pump may be putting out a good stream but may still not be performing well enough to get full flow to the engine (possibly an impeller blade has gotten loose and gotten into part of the engine reducing flow or the blade may have lost flexibility over time). When he eases into the throttle, the water pump is able to pump enough to keep the sensors from going off and then he can get to full throttle. My 2 cents are for problems in the impeller and cooling system.

 

[jchomer]

Re: 1987 suzuki dt 175

Thanks guys for the help I will let you know how things turn out.If you have anymore suggestions i will sure take them. THANKS<br /> JOHN