DT75 - can't get it to stay running

[Timk]

Re: DT75 - can't get it to stay running

I have a 1992 DT 75 TC, that I am thinking about selling. Do you know what I should ask for it?

 

[Vitamansea]

Re: DT75 - can't get it to stay running

I have A DT40 Zuki' that was running perfect, 1 key bump starting. Then one day idling along it died, it would restart but would not stay running. I got home with my girl driving and me pumping the ball constantly keeping it rock hard. Now I have the same prob, fuel right?

So I:

Rebuilt the fuel pump, disassembled and cleaned the carb with cleaner twice. Installed a new primer ball (on the right way) I primed that too. When I take off the hose to the carb fuel pumps out. Once it starts (after pumping the ball till solid) it runs for a few seconds and dies again new diaphram and all gaskets. I have no leaks and it WILL start.

Frustrating dont begin to describe this... Im an auto tech and aircraft mechanic, I can sync carbs (only has one) on bikes and bugs. All this hassle on what appears to be a reed valve 2 stroke carb? I have 130 compression, new plugs, spark for sure, I dont get it...

Anyone?

My last guess is either the feed from the tank or the connector at the engine whick I have no clue how that comes off, its on there tight and in a space you cant get a tool on, fuel flows thru it so I assume its ok.

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[Gas Giant]

Re: DT75 - can't get it to stay running

Um.... I have no idea what a running DT75 is worth. I'll swap you a 50hp Force for it......lol

Vitaman, I am definitely not a marine engine expert by any means but if you can pump gas manually to the engine and it runs, it sounds like your fuel pump can't supply the carb with enough gas. No idea why, especially since it has a new diaphragm. Or maybe I'm wrong, I dunno.

I gave up on my DT75 and its sitting on a stand in my garage. When I get the time (and space) I'm going to tear it down. But putting floors in my Bel Air is currently a higher priority.