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Author Topic:   suzuki carbs dt90
crosley95 posted 08-22-2002 08:45 PM ET (US)   Profile for crosley95   Send Email to crosley95  
hello experts,

throwing this out to any and all HELP!!

Issue: 1994 Suzuki DT90. bought used. shipped to me in february. it sat on its side until august. installed and rigged the engine using teleflex cables and brand new morse mt3 controller. '67 sakonnet.

new tempo fuel tank and lines. new tempo bulb. cleaned out oil tank. replaced inline oil filter (sensor)?? new fuel filter.

problem: engine starts and sneezes. will not accelerate under load.

action: took off carbs. found to be full of varnish. cleaned carbs and fuel lines with gumout and carb spray.

resolution: engine ran a little better. was actually able to motor around for a couple of hours at a very low rpm. (not sure of reading, tach is not working???) still bogging at higher revs.

talked to technician in florida. he thinks jets are still gummed up.

action: pulled all 6 jets and pilot screws. all were pretty clean except 2 on lower carbs. cleaned all 6 jets and two pilot screws. replaced and set screws to specs in clymer owner's manual. sprayed carb cleaner into the carbs while running.

result: ran worse than before. (HELP!!) talked to tech at brownspoint marine. he says right away that the carbs are still dirty. interior passages are still gunked up. recommends the removal of carbs and soak them in carb cleaner overnight.

What you all think? i know bigshot wants me to run the techron in the 1/2 gallon of gas. (that will happen as soon as i find another fuel tank to do this) hard to believe my problems aren't more serious. compression is 105, 105, 110, and 105.


crosley95 posted 08-22-2002 10:41 PM ET (US)     Profile for crosley95  Send Email to crosley95     
just a follow-up

when the plugs are pulled, all 4 are oil/fuel fouled. wet and black.

they were new when this all began two weeks ago. thanks for your consideration.


JFM posted 08-23-2002 12:12 PM ET (US)     Profile for JFM  Send Email to JFM     
Jeff, give me a call. I got an extra can you can use.
Regards, Jay 353-1800
Franko posted 08-26-2002 12:27 AM ET (US)     Profile for Franko  Send Email to Franko     
Another follow up:

We dipped the carbs in Berryman's Chem-Dip over the weekend. Cleaned the jets, orifices, tubes, hoses. You name it we cleaned it. Put the carbs back on and it purred like a kitten at idle. While in neutral, we can throttle it as much as we want. Sounds great. But...put it in gear and it dies when we try to throttle it up?
On a positive note, we did locate a Suzuki mechanic pretty close to us. It's going to be in his hands this week. We give...

Bigshot posted 08-27-2002 03:52 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
To do the techron thing you use a windshield washer fluid bottle or something. Just dip the line in it and squeeze the ball. You are getting there but without compressed air and knowing how to set up the carbs, they will not be right. Boiling carbs will not work if really gummed, which yours were. I hope you did not do any damage by running it that way. Do another comp test to be sure. i doubt it but make sure.
crosley95 posted 08-27-2002 06:47 PM ET (US)     Profile for crosley95  Send Email to crosley95     
hey big,

thanks for replying. finally gave up. we did do a compression test after the boat was run for a couple of hours. 105, 105, 110, 105.

took it to a mechanic. i guess it might be the fuel pump. what is it with these suzuki engines. NO ONE wanted to look at it.

have my fingers crossed that its just an adjustment.


Bigshot posted 08-28-2002 09:46 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
You need to find a zuki mechanic. As far as your situation goes, any good mechanic could try and work on it being it is carb related.
crosley95 posted 08-28-2002 01:45 PM ET (US)     Profile for crosley95  Send Email to crosley95     
hey big,

i've taken it to the closest zuki dealer. he's brand new and i'm not sure if he's the guy for the job. anyway, the only zuki expert that i've found is the guys at brownspointe. talked to him this morning and he says matter of factly that it is still my carbs. he says i have to soak the carbs for up to 3 or 4 days. he says an engine needs very little fuel to run without being under pressure. under pressure its a different story. he says the oil fouled plugs are an indication of lack of fuel and combustion.


Bigshot posted 08-28-2002 03:02 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
you really need an air compressor to blow out the gunk after boiling them.
crosley95 posted 09-03-2002 03:02 PM ET (US)     Profile for crosley95  Send Email to crosley95     

the closest suzuki dealer is a crook. i'm surprised suzuki would allow a guy to be a dealer with absolutly no idea what he's doing. he was surprised that i expected him to have a service manual.

this thing is so frustrating. the engine is finally starting to rev in gear. gps reading of 13mph at wot. motored around a little bit. suddenly heard a terrible sound out of the engine. shut it down and went home.

what to do now? cleaned the carbs 3 times. ran one tank of techron. ripped off by the closest dealer.

here's what i do have. a refinished 67 sakonnet that people go nuts over at the dock as i load and launch. "yeah its pretty alright, she'll only do 13mph, but yeah she sure is pretty"

somebody shoot me.

jay, i did read your kind offer. thanks, but no thanks. you're too kind.

i'm going to do another compression test and make sure something awful didn't happen yesterday.


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