How JustAnswer Works:

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

Ask RSRBOB Your Own Question

RSRBOB
RSRBOB, Technician
Category: Boat
Satisfied Customers: 900
Experience:  Former Yamaha Factory Service Rep, Dlr Line Tech, Serv Mgr, G/M
10825618
Type Your Boat Question Here...
RSRBOB is online now
A new question is answered every 9 seconds

I have two 1990 kawasaki js 440 stand ups, does any oil go

Customer Question

I have two 1990 kawasaki js 440 stand ups, does any oil go in the motor besides the mix? for example like a motorcycle, gear oil, motor oil, primary drive chain oil etc, also they have been sitting for several years winterized, what should i check for upon using again?
Submitted: 4 years ago.
Category: Boat
Expert:  shane j forrest replied 4 years ago.
The engines in those should be 2 strokes.You will mix the oil with the fuel for the engine lubrication.Go to your local Kawasaki shop and find their water craft 2 stroke oil and on the back of the bottle it will give you mixing instructions.
Customer: replied 4 years ago.
yes i knotow this but it is hard for me to believe that the bottom end has no source of lubrication....your tellin me the mix will lubricate the crankshaft, and all bottom end bearings?
Expert:  shane j forrest replied 4 years ago.
Yes the fuel in the crankcase mixed with the oil is plenty of lubrication for the the bottom end. Unlike a 4 stroke where the fuel only enters throught the intake valve and then in the combustion chamber the fuel in a 2 stroke enters the intake and then the carnkshaft basicly takes it and pushes it up in to the intake port of the cylinder.im sorry i trying to make it sound as simple as possible I hope this helps.
Customer: replied 4 years ago.
aritre sounds good not tryin to break your balls just looking to get rid of em and dont want to sell crap...last question shane, one runs and starts if i put the mix directly into top of carb, checked fuel lines they are not clogged (i think... there are four of them and one has a one-way valve, reserve, reg, return and the last i know not) took carb off and apart to check for blockage didnt find any...is there something i am missing? the other runs fine but idles high thinkin either gunk in it or choke stickin...thanx for your help
Expert:  shane j forrest replied 4 years ago.
The line that your not sure about is probally a roll over valve.the roller over valve is designed to prevent water from getting back in the fuel tank once the water craft is tipped over. do a compression test on the engine you have to pour fuel down to get started. the engine has to have good compression for it to be able to pull fuel through the carburator into the crankcase.If the compression is good then check to see if you have fuel to the carburator.If there is fuel present there then take carburator apart and look for debris or a problem with the float if equipped.
Customer: replied 4 years ago.
shane i appreciate your help but you gave me all info that i already knew....
Expert:  RSRBOB replied 4 years ago.
HiCustomer

The lines coming out of the tank are in fact On, Reserve, Vent (w/roll over valve) and Return. The On and Reserve lines go into the petcock, and the fuel supply line for the carb comes out of the petcock, goes through the fuel filter/water separator and into the carb.

One common problem on PWC carbs that have been sitting is the float needle gets stuck in the needle valve seat. These carbs are a floatless design, and depend on engine vacuum, fuel pressure and atmospheric pressure to lift the needle valve off the seat. If it becomes stuck, the normal forces exerted are not enough to move it, so you must un-stick it manually. That would require taking the carb apart and either pressing on the opposite end of the float arm or removing the pivot pin for the float arm and pulling the needle out of the seat, then putting it back together.

Also, make sure the vacuum line from the intake to the fuel pump on the carb is connected and not cracked or split. It is a pulse type fuel pump that depends on the positive and negative pressures generated in the crankcase to pump fuel to the carb from the tank.

If the ski that is running has a high idle but it is not in the water, that is normal. When the jet pump that drives the ski is in the water, it creates a load that will bring the engine speed back down to a normal idle.

These carbs do use a legitimate choke, not a fuel enrichening circuit, therefore if it were sticking, the ski would not want to run past start up, so that is highly improbable that you have a sticking choke. There is an idle speed adjustment on the side of the carb, where the throttle cable attaches to the pulley, that you can adjust the idle speed with, but you should only adjust the idle speed with the ski sitting in the water.
If you have any more questions, feel free to ask.

Thanks
RSRBOB

Edited by RSRBOB on 11/2/2009 at 1:32 AM EST
Customer: replied 4 years ago.

thanx for the info...i had the carb apart and the needle jet along with the pivot arm was not stuck, but there was a metal plate, screen, and gasket that was held together by two screws, (i am assumming it is where the fuel is directly injected into the carb due to there is a small hole in a brass piece that leads into carb) and the gasket was so dry that i could not remove it to see what was underneath...so im wondering is there anything that could block fuel flow and or possitive pressure under that gasket? i did not want to take it out for fear of ripping it and then having to travel to kawi!!! so lastly i ask if then this is not the case and the fuel lines are not clogged, and none are cracked, and the lines inside the tank are not broken, cracked or clogged, what could possibly stop flow? and both do run ive had them running

Expert:  RSRBOB replied 4 years ago.
Here is a link to a diagram of the carb. Please use the reference numbers to describe what you are afraid to take apart.

And it is not the float arm that gets stuck, it is the needle that it lifts.

I understand both are running. One you have to pour gas down the carb to get started, the other idles high.

http://216.37.204.203/Kawasaki_OEM/KawasakiPWC.asp?Type=13&A=141&B=2


RSRBOB
Customer: replied 4 years ago.
36 37 38 39, sorry used wrong word
Expert:  RSRBOB replied 4 years ago.
OK, those components should not cause the symptoms you are experiencing.

My next question would be have you double checked the routing of all the hoses connected to the carb? The easiest way to do that in your case would be to compare the running one to the non starting one.

Next, the fuel has to come in through the cap, #51, and then work its way down through the check valves, #47, then out to the perimeter and pass through the holes around the edges of #41 -#48 and into the fuel chamber area.

Also, I would advise removing the fuel screws and shooting carb cleaner and compressed air through those passages to make sure they are open. Again, set the fuel screws in the same position as the running ski. Set position is defined as the # XXXXX turns out from a LIGHTLY seated screw. Fuel screw adjustments are made in 1/4 turn increments, and specs can also be described as 1/4 turns as well.

RSRBOB

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
< Last | Next >
  • 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, 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. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Dominick

    Marine Mechanic

    Satisfied Customers:

    1009
    25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
< Last | Next >
  • http://ww2.justanswer.com/uploads/dominickb/2008-12-14_204035_dominick.jpg Dominick's Avatar

    Dominick

    Marine Mechanic

    Satisfied Customers:

    1009
    25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    Rigger, Diagnostician

    Satisfied Customers:

    557
    40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness
  • http://ww2.justanswer.com/uploads/whitesmarine/2009-11-07_025719_07011.JPG John White's Avatar

    John White

    Marine Mechanic

    Satisfied Customers:

    306
    11 years experience working on outboards, inboards, sterndrives & pwcs
  • http://ww2.justanswer.com/uploads/OL/oldnewenglandmarine/2012-9-8_15014_icon.64x64.jpg Jason's Avatar

    Jason

    Marine Mechanic

    Satisfied Customers:

    7718
    Degree in Marine Technology. Gas and diesel marine mechanic.
  • http://ww2.justanswer.com/uploads/JA/jacksparrow1956/2011-1-16_191846_009.64x64.JPG Tan's Avatar

    Tan

    MerCruiser Certified Technician

    Satisfied Customers:

    7330
    39 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
  • http://ww2.justanswer.com/uploads/JE/JeffGr/2012-6-15_14217_20001003AA1.64x64.JPG Jeff G.'s Avatar

    Jeff G.

    Marine Mechanic

    Satisfied Customers:

    4172
    39 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance
  • http://ww2.justanswer.com/uploads/dkreines/2008-3-22_155128_daveja.jpg Captain Dave's Avatar

    Captain Dave

    Marine Mechanic

    Satisfied Customers:

    2672
    USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience