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88b DT150

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boatmadmaniac

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Hi all.

I have a DT150 88&#

Hi all.

I have a DT150 88' model. The motor is no longer oil injected and I am running pre-mix at 50:1 ratio. I fired her up the other day and ran the motor for a few minutes. Later on that day I noticed an oily discharge running out from under the propeller and down the skeg. I pulled the prop off and i was glad to see it wasnt the drive shaft seal leaking. Its a thick greasy dark grey/black sludge. doesnt have much of a smell. smells like exhaust fumes. Is this just exhaust sludge or what?

Cheers
 
"That is exactly what it is -

"That is exactly what it is - burnt/unburnt oil that is exiting down the exhaust housing and out through the "through hub" exhaust on the prop.

Most oil injected motors will have a variable oiler such that at idle it may only be mixing at 100:1 and 50:1 at wide open throttle (or something along that line). Idling on pre-mix results in greater concentration of unburnt oil than you are used to.

If you do alot of trolling, low speed running etc you may also want to keep an eye on the sparkplugs. The richer oil mix will tend to foul them considerably quicker - no adverse affect on the motor mechanically, but will knock the performance down somewhat due to the fouled plugs, so worth changing them sooner than you would have otherwise..."
 
"Hi there.

Thanks for that

"Hi there.

Thanks for that Im very apprecaitive. Its a ski motor so im only slow moving for a moment while the ropes tighten :)

Thankyou for that,
Kind regards"
 
Are you running "gapped&#3

Are you running "gapped" plugs or surface gaps?

If you are mostly running it a little heavy on the throttle a decent surface gap plug would be in order...
 
Hi there.

At the moment it

Hi there.

At the moment it has the 6 plugs in it that it had in when I purchased the motor. They are just regular spark plugs (like car ones) are suggesting I need the other kind?

regards
CAllum
 
"There is two different styles

"There is two different styles of plugs. The "regular" kind (gapped with the little metal thingy gapped away from the diode at whatever the mfg calls for) and a surface gap plug - looks like a plug with that metal thing broken off.

Most motors will have a cross reference for both styles of plugs.

The (regular) plug tends to work best at lower rpms - lots of trolling, running canals etc - slower speed operation.

The surface gap is designed for higher rpm operations and do work better.

The regular plug is great "all around" but in certain applications - ski boats that are usually pulling a skier, a bassboat that bogies from one spot to the other and then shuts down etc may experience significant performance increases (in a cleaner burn and better fuel usage) if they have surface gap plugs installed.

If you have a local dealer you could enquire as to whether or not they would be suitable for you particular application and if in fact they are available..."
 
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