Other yamaha wetjet kraze help needed!

[ryanmxr]

hi everyone on the forum , i bought a wetjet kraze 1996 i beleive ,last week as a non runner because of wiering problems , sorted wiering got it turning over and fiering up but it will tick over and start to pick up revs, when i go past half throttle it wants to bog and cut out , my fuel mix is at 50:1 is this correct? if not please correct me. (the previus owner took the self mixing tank out) i live in the uk if that would change any ratios? also i cannot find a manual or any advice on the internet of carb settings or any general info . if anyone could shed some light on what to look out for on these skis please could you tell me . thanks for taking interest ,ryan

 

[jetskidan]

that sounds like carb issues to me.. we mix our fuel at 50:1 too. try taking your carb out, cleaning it, then tune it to what a stock 701 would be

 

[tipafew]

I would agree that it sounds like a carb issue. Clean the carb and maybe put a rebuild kit in it. Also check the filter screen inside the carb.

 

[ryanmxr]

ive tried two carbs and they both do the same , im going to try a third tonight and see if thats the same , dose anyone know the correct settings for a 701 carb , i believe there is a upgrade but how do i check if my ski has this? thanks for the replies guys much apriciated

 

[GSXR RACER MIKE]

When doing trouble shooting in my job we always answer the question "What has changed" first, the previous wiring problems you mentioned concern me because there had to be a reason they were messed with in the first place. These engines need 2 things to run: the correct fuel/air mixture and ignition at the correct time. It's really going to be determining which one, or if both, are messed up? It sure does sound like a carb issue, but I had a motorcycle coil go bad years ago that caused a very similar issue.

To help eliminate some potential problems:

- make sure any fuel lines / filters / screens are unrestricted
(including the main / reserve fuel supply petcock assembly, most likely mounted on the fuel tank)

- check the compression in each cylinder

- confirm that the ignition timing is set correctly

- make sure there isn't any water in the electronics

- make sure there's good spark

- Make sure your battery is good and that the charging system is doing it's job

 

[ryanmxr]

thanks for thr replys guys , i stripped the car down once again last night and made sure everything was unblocked and free of dirt. ive also taken the exhaust off as i noticed a small leak coming from under it to then find the exhaust had a small amount of liquid in there is this a problem? how would i go about checking the timing? theres no water in the electronics and theres a good spark but i am going to buy new spark plugs , ive been using a car battery to turn the engie over for now. ive taken the fuel filter out to see if it is that but no better . dose anyone know the carb screw settings on this? thanks again for replying guys

 

[GSXR RACER MIKE]

...ive been using a car battery to turn the engine over for now....

So is there a battery in the ski that's junk or are you starting it with a car battery and then running the ski off the charging system only (without a battery in the ski at all)?

If the battery in the ski is junk, or your running solely off the charging system without a battery at all, then the lack of a good battery MAY be your problem. Most charging systems are made to keep the battery charged AND provide power for the electrical system, being as this is a 15 year old ski the charging system may not be able to keep up with the electrical demand by itself - a good battery would help provide extra power when needed. Also if there's a battery in the ski that's junk it can reap havoc on the electrical system, possibly even fry out other electrical components. That's really common in automotive, a bad battery can take out a good alternator, a bad alternator can take out a good battery, even bad cables can take out a good battery and/or good alternator (or shorten their lives dramatically).

I'm not saying that's it for sure, but it would be easy enough to throw a friends good battery in your ski and see if it solves the problem. If it doesn't, at least you've eliminated that as a possibility.

 

[ryanmxr]

hi im starting the ski with a car battery and keeping the battery connected , could this be the problem? also the battery is a good battery

 

[GSXR RACER MIKE]

hi im starting the ski with a car battery and keeping the battery connected , could this be the problem? also the battery is a good battery

The battery is most likely not the problem then.

I'm not sure how to check the ignition timing on this specific engine, hopefully someone else will have that info for you.

Put the brand new spark plugs in (make sure they are the correct ones for that specific engine), fire up the engine and bring it to the point where it's having the issue running and hold it there briefly, then shut the engine off without letting it idle down. After that pull the spark plugs and see what they look like: light colored = not enough fuel / too much air or carb set too lean, dark colored = too much fuel / not enough air or oil fouling (these are both assuming the ignition is set properly and good spark strength).

I'm also wondering if stuck or damaged reeds could be causing the issue?

 

[ryanmxr]

i will try this and get back to you thank you for your replies and help mike

 

[GSXR RACER MIKE]

I was thinking you should also check to see if you have an air leak somewhere between the carb and cylinder, that can cause all kinds of craziness as well. Check and make sure all mating surfaces, gaskets, and seals are in good condition (including any rubber boots in the intake tract) and that there isn't any missing hoses, set screws or plugs - it wouldn't hurt to look for cracks in everything as well.

 

[trojoro]

Just a thought, could u have possibly crossed over the temp wires causing limp mode?

 

[ryanmxr]

im going to make sure everything is sealed and also how would i check for the temp wires? also theres a sensor which sits in a insert in the head dose this have to be wired up as it looks like a cut off switch if the engine gets too warm am i right?

 

[ryanmxr]

just letting you know i have sealed the bottom of the carb, cleaned the plugs up, poured a little amount of neat fuel down the carb to see if the engine will rev out , it sure did so thats the problem of the bogging at half revs , i have the original oil mixer , do i put this back in or shal i mix fuel by hand? also is the fuel mix 50ml of oil to 1 gallon or 50ml of oil to 1 litre? i mixed mine at 50 ml to 1 litre which is why it was killing the spark , so am i right in thinking you guys do it at 50 ml to 1 gallon? thanks for all your replys guys

 

[GSXR RACER MIKE]

50:1 means you need a ratio of 1 part oil to 50 parts fuel, no matter what unit of measure you use. Here's a random ratio calculator I found using Google: ( http://www.csgnetwork.com/oilfuelcalc.html )

Per that site:

Using US Gallons it would be 2.56 US Ounces of oil to 1 US Gallon of fuel.

Using metric that would be 20 Milliliters of oil to 1 Liter of fuel.


For a US to Metric conversion:

1 US Gallon = 3.785 Liters which means for a 50:1 ratio 1 US Gallon of fuel would need about 75 ml of oil.

1 Liter = .2642 US Gallons which means for a 50:1 ratio 1 Liter of fuel would need about .68 US Ounces of oil.

 

[ryanmxr]

thats helped alot thanks mike youve helped me loads thanks again