Newbie DT-25 exhaust & cooling questions

[tallmatt67]

Hi, thanks in advance for your responses. I have a new-to-me 1987 Suzuki DT-25. I ran it for about an hour last season and have a handful of questions:

1. It appears to exhaust through the prop once above idle speed Is this right?

2. Virtually no water except a drop comes through the tell tale hole. Should there be a steady stream?

3. After running wide open for a few minutes, water spits out through the exhaust ports above the waterline. This water is hot to the touch. Is this supposed to spit out here or is this a symptom that the system isn't working right?

4. After running wide open for a few minutes, I removed the cover and found the head wasn't overly hot to the touch. Does this mean that there is sufficient cooling?

Today, I installed a replacement water pump kit (impeller, backing plate, gasket) and inspected the water tube. I assumed that the impeller was shot, but the old one looked good. After reassembly, I put her in the lake and found no improvement over last season. Of course, the water was quite cold at 41 degrees, but Am I risking overheating & damaging the engine when the water warms up?

I didn't try to blow out the tell tale hole but can hook up a compressor and use air on it if it's supposed to have a steady stream. Any tips & answers to the questions? Thanks again for any suggestions you might have.

-Matt

 

[Mas]

Re: Newbie DT-25 exhaust & cooling questions

Everything sounds OK except the tell tale. If the motor is not overheating, likely the tell tale is plugged. Run some weed eater string up through the tell tale and see if some debris will clear. There may also be a chance that the water tube grommet was pinched. Make sure the motor is not over heating! You should be able to hold your hand on the head area for a bout three seconds when at temp...can you?

MAS

 

[deejaycee_2000]

Re: Newbie DT-25 exhaust & cooling questions

Everything sounds good to me .... just take a thin wire and wiggle it around in the tell tale while the motor is running, insects love to make their nests in there .......

 

[gsk2005uk]

Re: Newbie DT-25 exhaust & cooling questions

2. Virtually no water except a drop comes through the tell tale hole. Should there be a steady stream?


I didn't try to blow out the tell tale hole but can hook up a compressor and use air on it if it's supposed to have a steady stream. Any tips & answers to the questions? Thanks again for any suggestions you might have.

-Matt

Hello,

I had the same problem with my DT25 a couple of years back. I changed impeller (as the old one was in pieces!) and still not water stream. I used water with pressure (via the garden hose pressure attachment), through the tell tale hole, and problem solved. It could be anything blocking the hole, a piece of wire should push most of the blockage away but water should clean it best.

Hope this helps

 

[tallmatt67]

Re: Newbie DT-25 exhaust & cooling questions

Forgot to say thank you to all for the help. There was sand plugging the telltale, it took a dozen or so probings with weedeater line to clear it all as the jackets flushed clean. Peeing like a champ now and great cooling.

I appreciate all your responses.

-Matt