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Old 02 July 2006, 22:21   #1
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Country: Australia
Town: Sydney
Make: Zodiac
Length: 3m +
Engine: Jet 80hp
Join Date: Jul 2006
Posts: 3
Zodiac ProJet 80hp Engine/Fuel Probs

G'day - I have purchased a secondhand Projet 350. On the first run out I have used the petrol that was already in the tank....Oh no i hear you say. Yes of course it sucked out all the crap and stale fuel out of the bottom of the tank. Now when I increase the throttle from idle the motor coughs and stalls from lack of fuel. I think the only option is to take off the fuel filter and replace/clean and possibly clean the carb....does anyone have any comments and tips on how to do this?? Would it be worth sticking in some fuel additive to attempt to flush the system first??? Also is the engine in this boat the Waverunner XL700 Yam motor?? Think i may need to invest in a workshop manual! Any advise would be much appreciated - Best wishes from a very novice mechanic in OZ!
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Old 03 July 2006, 09:22   #2
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Country: USA
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Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
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a factory manual is allways a good investment, you got to clean the crap out,
no additives will help, you should clean out the carb(s) too, new filter, flush the lines and the tank.

the carb has small parts, you would need to remove the carb, the float bowl,
the needle and float,... ect
mite be diafram carb (s) on thare, similar but dif'.
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Old 03 July 2006, 19:26   #3
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Country: Australia
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Make: Zodiac
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Engine: Jet 80hp
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ProJet problem

Thanks Fast Fred. I now have to find out what manual to buy for this engine! If anyone out there has stripped a carb on a yam jet drive it would be good to hear from you. With regards to the carb parts - is it difficult to put back together??? Getting a little worried about pulling something apart that has lots of bits and pieces.....
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Old 04 July 2006, 04:36   #4
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Country: UK - England
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Boat name: Shiver
Make: Zodiac Medline II
Length: 6m +
Engine: Yamaha F150
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Posts: 80
Re:

I had a similar problem with my projet ( coughing and stalling) at the start of the season, turned out to be a loose clamp on one of the fuel hoses which stopped the flow of fuel. Up to this point the only part i've dismantled was the jet intake to remove a rope.

Sorry i can't be more helpful.
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Old 04 July 2006, 05:41   #5
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Country: USA
Town: boston
Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
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Join Date: Apr 2006
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is it an inboard rotax, or an outboard with a jet foot?got a pic?
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Old 04 July 2006, 21:37   #6
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Country: Australia
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Make: Zodiac
Length: 3m +
Engine: Jet 80hp
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Projet Fuel/Engine Probs

Thanks for your responses! With regards to the engine it is a 700cc yamaha engine out of a waverunner so it is not a jet outboard. I have been recommended by someone here in Sydney to first of all check the fuel filter and then also open the choke on the engine and spray carb cleaner through the whole opened by the choke directly into the carb. Also I have been advised to uncouple the fuel entry pipe and then take off the exit pipe and spray carb cleaner through there (seeing what sort of crap comes out of the exit pipe)....let it dry out from both these attempts and try putting some premium high octane fuel in to burn away whats left! This would avoid having to take the carb apart which i am not too confident about. I believe the carb that is fitted is more likely than not the 'Mikuni Super BN38'. It doesn't look like a very complicated carb but still there are a lot of parts to remove and remember where they have come from! Thanks again and if you have any more ideas please they would be much appreciated. Allegria - any ideas what the exact engine is so that i can buy the Yamaha PWC manual?
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Old 05 July 2006, 19:05   #7
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Country: USA
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Boat name: Miss bad 61
Make: Crapko, AKA Mako
Length: 5m +
Engine: OMC Mod50
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Yamaha did make a 700 jetski motor and drive.
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Old 25 March 2009, 18:10   #8
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Country: Australia
Town: Melbourne
Boat name: Swordfish
Make: Zodiac
Length: 4m +
Engine: 80hp jet drive
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Posts: 2
I may have the answer

My Pro jet did the exact same thing, it reved up until it stalled. There is a fuel jet adjustor screw at the back of the engine, you need to use a coin to be able to move it. Everything is explained in the manual that you can get off ebay, I will try to get you the name of the supplier.
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