Boat

Have Boat Questions? Ask a Boat Repair Expert.

Ask an Expert,
Get an Answer ASAP!

Boat

I have a 2002 1200 stx-r. New pistons rings, new

Customer Question
I have a 2002 1200...
I have a 2002 1200 stx-r. New jugs pistons rings, new rectfier/regulator, new gas diverter valve, stator results yellow to yellow wires 0.00 ohms, according to my chart the results are suppose to be .64-.96, however they put out 30-45+ volts when running, the green/blue.51 ohms(which is normal, battery gets 12.8-13.5 volts while running. on land revs like crazy, in water sounds good but will not go over 1/2 throttle or 35-3800 rpm's.
JA: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Is there anything else the Marine Mechanic should be aware of?
Customer: no
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Marine Mechanic about your situation and then connect you two.
Submitted: 1 year ago.Category: Boat
Show More
Show Less
Ask Your Own Boat Question
Answered in 22 minutes by:
7/4/2016
Marine Mechanic: RSRBOB, Technician replied 1 year ago
RSRBOB
RSRBOB, Technician
Category: Boat
Satisfied Customers: 1,078
Experience: Former Yamaha Factory Service Rep, Dlr Line Tech, Serv Mgr, G/M
Verified

Hi and thank you for your question.

I am happy to help you resolve the problem with your Jet Ski. I do however have a couple of questions for you that will help me more fully understand what you are up against.

First, why did the cylinders, pistons and rings get replaced? Please be as detailed as possible.

Were the parts replaced with OEM Kawasaki parts or aftermarket parts for a Kawasaki?

Who replaced the parts?

Is a gas diverter valve also known as a petcock, or as Kawasaki calls it in their parts diagrams a fuel tap assembly? Why was it replaced?

As far as the stator, it is very difficult to measure less than 1 ohm resistance so I wouldn't worry about that. It sounds like you have good AC output on the stator leads so that should not be an issue. Even if it were, it would manifest itself as being a dead battery. The ignition system is a magneto system that does not use the battery for running. The battery's main purpose is powering the electric starter.

Unless you have already confirmed it, I suggest putting an automotive style inductive timing light on one of the spark plug leads and put the pump in the water and see if you are losing spark at half throttle. If the engine goes into a mis-fire, or does what ever it does preventing it from revving up, and the spark remains constant, you do not have an ignition/electrical problem. If the ski is on a trailer, you don't have to take it off the trailer for this. Just back it into the water still strapped to the trailer and do the test right there.

If you are not losing spark, the next thing I would like you to do is a compression test on all 3 cylinders. I fully understand those parts are new but we know we have a problem with the ski so we don't want to assume anything. Make sure when you do the compression test you leave the 2 spark plugs installed in the cylinders that are not being tested. Ground the high tension leads to a suitable ground. You do not want to actually run the engine while performing the compression test.

Lastly, I would suspect a fuel supply issue, quite possibly carb related. That however is the last thing I would suspect and definitely do not advise going into the carbs until we address the other points first.

Let me know what you find,

Thanks

Customer/p>
Ask Your Own Boat Question
Customer reply replied 1 year ago
according to my compression tester(which I can't fully trust at this point) said the compression was low, so I got a set of SBT jugs piston ring, gasket set, I installed them, I had to put a new starter in as idler bearing was bad and trashed the old starter, which was the state i bought the machine in. Fuel Tap was very sticky so I replaced it. Carbs have been cleaner out all jets are ones suppose to be in there. I did put a new rectifier in as it was only putting 12.2 volts running now it's 13+v. I dont have a way to check the spark that I know of.
Customer reply replied 1 year ago
Actually I do have an inductive timing light.
Marine Mechanic: RSRBOB, Technician replied 1 year ago

Thank you for the additional information.

Go ahead and test for spark at idle and revving it up and see what happens. It would actually be a good idea to check your compression again even if you don't trust your gauge. At this point, it is more about consistency than a number. Especially if your new readings are somewhat consistent with your old readings. Was the ski running poorly before that prompted you to do a compression test and then replace everything?

Let me know the results.

Thanks

Customer/p>
Ask Your Own Boat Question
Customer reply replied 1 year ago
I bought the machine not running seller told me it needed a new starter, he didn't know(or maybe he did) idler bearing was bad so after reinstalling motor the bad bearing trashed the new starter. so out comes the motor again. The fuel pump is new as it was leaking from the start. After replacing idler bearing and starter had no issues getting it to start and idle. Just when under pressure in the water it would not go above 3600 RPM, So that's when the shotgun mechanics started. So the only thing that hasn't been replaced is the CDI ignitor Coil pack. It almost seems like it's in a limp mode if this machine has one. The water temp sensor and air temp sensors all check out and do what they are suppose to do.
Marine Mechanic: RSRBOB, Technician replied 1 year ago

Thank you for the additional information.

The best thing we can do now is use the divide and conquer method to diag and repair the ski.

As I am sure you know, we need adequate compression, sufficient spark at the correct time, and the proper air/fuel ratio being delivered into the cylinder. When a problem exists or occurs, we need to divide those 3 elements up and find out which is missing or being lost. Once we know that, they we can hone in on that system and get more in depth with our diagnosis. I still do not suspect an ignition related issue but the timing light test will determine that. Not to mention it is non invasive and very easy to do. We can gain a lot of information with a very small effort on our part.

Let me know when you get that test done and what the results were. BTW, I would be careful about using too cheap of a timing light to do this test. Some cheap timing lights by design cut out if too many RPM's are detected. It doesn't mean there is a problem with the engine, just the test exceeds the capability of the timing light.

Customer/p>
Ask Your Own Boat Question
Customer reply replied 1 year ago
In looking down throat of carbs when hitting the throttle the venturi slides in the CDCV carbs do not look like they are operating(or sliding open). I've taken them apart but did not fully take apart the venturi housing.
Marine Mechanic: RSRBOB, Technician replied 1 year ago

Thank you for the additional information.

That may or may not be a problem. CV carb slides react differently when there is no load on the engine compared to under load. One thing they should do is lift when you move them by hand, and should spring back down when released. If the diaphragms aren't perforated, there is no reason they should not operate properly while underway.

So far, I have asked for a compression test and a dynamic spark test. Have you made any headway on those?

If you think I am leading you in a bad direction and would prefer to work with another expert, let me know. I will opt out and open it up to others. that notwithstanding, at this point, without that information, I don't think I can help you. I am not a fan of guessing at potential problems as opposed to sound diagnostic procedures.

Customer/p>
Ask Your Own Boat Question
Ask Dominick Your Own Question
Dominick
Dominick
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1,009
1,009 Satisfied Customers
Experience: 25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Dominick is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Ted G.

Ted G.

Rigger, Diagnostician

695 satisfied customers

40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

15,782 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,003 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,728 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

< Previous | Next >

Related Boat Questions
We're on a Bav 40, 2002 model which has a Volvo Penta MD2030
We're on a Bav 40, 2002 model which has a Volvo Penta MD2030 engine. It has about 1100 hours on it. New fuel pump & mixing elbow 3 yrs ago. Recently, we changed the primary and secondary (racor) filte… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,782 satisfied customers
BF60A outboard, has had O2 sensor replaced because check
BF60A outboard, has had O2 sensor replaced because check engine light had come on twice, reader confirmed this was fault. It still will not reach full revs at times and when it does it drops back to 4… read more
Boat Doc
Boat Doc
144 satisfied customers
Which standard is maximum power rating calculated to for a
Which standard is maximum power rating calculated to for a Suzuki 150Hp Outboard. Model D150? … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
My 1994 200V6 Yamaha outboard run out of oil due to a faulty
My 1994 200V6 Yamaha outboard run out of oil due to a faulty oil level sensor in the outboard tank not activating the oil supplyfrom the filler tank. The motor died while running at 75% speed. It is s… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a 2002 125hp mercury outboard. It has a toggle kill
I have a 2002 125hp mercury outboard. It has a toggle kill switch. Im wanting to replace the kill switch and ignition. Is the current kill switch a 3 wire or 2 wire. If 3 wire, can i replace with a 2 … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,782 satisfied customers
Need to install a new Throttle Linkage Kit by wednesday. I
Need to install a new Throttle Linkage Kit by wednesday. I have the kit, and understand what the end result should look like but a step by step would be helpful … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
Ering a Bertram Purchase and switching from Freshwater Lake
ering a Bertram Purchase and switching from Freshwater Lake usage to Salt Water … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,782 satisfied customers
Flemming from DK here. So now I'm almost done with the
Hi Jason, Flemming from DK here. So now I'm almost done with the wiring on the engine, that you very succesfully helped me with. I'm looking at the switchboard and ignition key now. Quick question, is… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,782 satisfied customers
I have a 1993 Yamaha outboard 2 stroke. Which is only
Hi I have a 1993 Yamaha outboard 2 stroke. Which is only running on two of the three cylinders … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have recently purchased a second hand boat which has a
I have recently purchased a second hand boat which has a HDS5X fitted but I cannot get the split screen to disappear, could you please give me some advice. … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have an issue with my 1998 25hp NMO Autolube Yamaha. It
Hi I have an issue with my 1998 25hp NMO Autolube Yamaha. It has a backfire/sneeze on tick over only, it is fine through the rest of the power range. I have taken the carbs off had them fully cleaned … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
Iwant to install a bow thruster on my Sea Ray 240 OB, 2015.
Iwant to install a bow thruster on my Sea Ray 240 OB, 2015. Will it work? Do you recommend it? … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
Is there a bow thruster that will work on a sea ray 240 sun
Is there a bow thruster that will work on a sea ray 240 sun deck? Can it be installed where boat is stored?… read more
Boat Doc
Boat Doc
144 satisfied customers
I've got a 2006 5.0 mpi with 500 hrs on it. It had new
I've got a 2006 5.0 mpi with 500 hrs on it. It had new manifolds and risers 12 months ago, 40 hours use since. Have noticed rough idle and needs a bit of throttle to start, then low power on take off … read more
Boat Doc
Boat Doc
144 satisfied customers
I have to change the hydraulic trim/tilt pump on my 50 hp
I have to change the hydraulic trim/tilt pump on my 50 hp mercury, will I have to remove the motor from the boat to do it? … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,782 satisfied customers
Slow cranking then will crank normily be for starting. Some
slow cranking then will crank normily be for starting … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,782 satisfied customers
Do you have to remove engine on invader inbd /outbd
do you have to remove engine on invader inbd /outbd merccruiser engine to replace starter … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have an 8 horsepower Honda outboard motor that I have just
Hi I have an 8 horsepower Honda outboard motor that I have just swapped over to my pontoon boat and I'm having a problem with the alarm going off when I'm putting them in the back together I got every… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,782 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x