Boat

Have Boat Questions? Ask a Boat Repair Expert.

Ask an Expert,
Get an Answer ASAP!

Boat

Have a 2003 yamaha LST 1200AB engine in a LX210 jet boat, Starboard

Customer Question
engine will be running at...
have a 2003 yamaha LST 1200AB engine in a LX210 jet boat, Starboard engine will be running at 4000 and lugs down to 3000 rpm but is not in limp mode, does not seem to be overheating, on the ramp with boat on trailer will peg at 5500 RPM no fluctuation, will idle but rpms are erratic in the 4000 range, drop to 3 then up to 5 with a little throttle.
comp tested both engines all cylinders between 122 and 125, pulled the plugs, cleaned and gapped at .026
tested fuel, looks clean, filters are see through, i see no dirt, both engines pull from same tank.
when on the ramp it seems like the port engine tries to move the boat when in nuetral, but does not happen with the starboard is it possible the coupler is slipping also?
Submitted: 1 year ago.Category: Boat
Show More
Show Less
Ask Your Own Boat Question
Answered in 10 hours by:
5/14/2016
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 not sure what you mean when you say you have an LST engine in an LX210. All of those boats used the 65U engine so compatibility should not be an issue.However, since you mentioned it, it sounds like what you are also saying is there was an engine swap at some point and the starboard engine is no longer the original engine. If that is true, is the replacement engine a rebuilt engine or short block from an aftermarket manufacturer? I am also going on the assumption that the engine in question was not doing this prior to needing to replace it. Please correct me or fill in as many details as you can here please, you never know what might help us get to the bottom of this problem quickly.Since you said the compression was consistent, we will look in other areas for now. Mainly, the carburetion. Since carbs have different circuits that they use to meter fuel flow at various throttle settings, it is plausible that it could start and idle fine, yet under a load demonstrate a running problem. This would indicate the high speed circuit has issues. The first thing I would suggest is checking to make sure the high speed screws are set correctly. The #1 and #3 carb have their high speed screws set at 3/4 turn out from LIGHTLY seated. The #2 carb has its high speed screw set at 1 turn out from LIGHTLY seated. Unfortunately you about have to pull the carbs to be able to check that. The high speed screws are on the sides of the carbs that are facing the cylinders. The screws that are on the same side as the throttle linkage are your low speed screws.If the high speed screws are set correctly, then you will need to take the carbs apart and inspect and clean them. You want to pay special attention to any kind of debris that would restrict fuel flow on the high speed circuit. The high speed main jet is sized 135. In case someone has been in here before you, remove the high speed screw and blow compressed air or contact cleaner through the high speed screw hole in towards the carb. Make sure it is coming out inside the carburetor where the 135 main jet was.Lastly, I would check to make sure the vacuum lines for the fuel pumps were all connected and stick your fingers down the intake manifold and make sure you dont have any bro***** *****s.If you have any more questions, feel free to ask.ThanksRSRBOB
Ask Your Own Boat Question
Customer reply replied 1 year ago
The Boat is an LX210, i thought it came with these engines, but their serial numbers or models were LST200AB which I have found that number when looking for parts. I am pretty sure these are original engines.
I pretty much figure by now I will be cleaning and rebuilding the carbs, or may have it done at a shop.
Any idea what the book hours would be on a job like that?
Is there any procedures documents for removal and install of the carbs?
When I look at Yamaha parts on their web page it shows carb 2 & 3 NLA do you know if the internal rebuild parts are the same as # ***** for all 3
Marine Mechanic: RSRBOB, Technician replied 1 year ago
Without actually consulting the flat rate, and it being a boat and not a personal water craft, you are probably going to be looking at 3-4 hours per engine to get the carbs cleaned. One bugaboo is that the exhaust has to come off to get to the carbs to be able to take them off. Flat rate really only applies when a dealer is getting paid by the manufacturer. Most shops bump flat rate 50% because typically the factory flat rate times aren't terribly realistic.If you decide to do it for yourself, make sure you get the Mikuni 44mm carb kits for Yamaha engines (if you don't go OEM). Mikuni makes the same size (44mm) but the carb body is much smaller than the Yamaha carb body and the o rings and gaskets won't fit.If you have any more questions, feel free to ask.ThanksRSRBOB
Ask Your Own Boat Question
Customer reply replied 1 year ago
Thanks still deciding, when I look at OEM do not see actual kits,all I see is an ala cart list
Marine Mechanic: RSRBOB, Technician replied 1 year ago
Here is what I was looking at. Typically, aftermarket distributors sell the Mikuni rebuild kits for less than the boat manufacturer. This shows the repair kit as $267. That is per carb. I believe that includes a lot of components that you would not automatically need to replace.http://partsfinder.onlinemicrofiche.com/riva_normal/showmodel.asp?Type=13&make=yamahajb&a=33&b=34&c=0&d=2003%20LX%20210%20CARBURETOR%20REPAIR%20KIT This is a link to an aftermarket distributor that sells Mikuni brand rebuild kits. I am not a fan of 3rd party rebuild kits howeve. I do suggest sticking with Mikuni genuine parts, just not necessarily from Yamaha. :)Let me know if you have any more questions.ThanksRSRBOB http://catalogs.wps-inc.com/2016/watercraft/#182/z
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

15,750 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,001 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
I have a volvo Penta 130 with twin solex 44pai carbs. I have
I have a volvo Penta 130 with twin solex 44pai carbs. I have just stripped and cleaned them our, and fitted new kits into them. what float level do I set? can't seem to find the setting anywhere. Than… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,750 satisfied customers
I have a 2002 mercruiser 454 mpi. the fuelpump dose not come
hello, I have a 2002 mercruiser 454 mpi. the fuelpump dose not come on when I turn the key on. tested the pump by jumping it at the relay and it is good. tested the relay by putting on the other motor… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,750 satisfied customers
Recently purchased a 2005 Silverton 34' Convertible with
Recently purchased a 2005 Silverton 34' Convertible with twin 6.0l gas Crusaders with twin engine controls (single helm station on the upper fly-bridge). That being said,, I hate the dual set of engin… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
Have an 898C system and can't get the new Navionics Platinum
have an 898C system and can't get the new Navionics Platinum card to stay down in the SD card slot. I can hold the card down and the card works but soon as I release it the depth line go away. Any sug… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a 2003 Sea Ray 320 I just had an engine replaced the
I have a 2003 Sea Ray 320 I just had an engine replaced the problem now is none of the instruments work I can't get that engine hatch to go up or down none of the 12-volt instruments on the panel work… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
No water coming through the bottom but through the top, 240
No water coming through the bottom but through the top … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,750 satisfied customers
It is a boat and not running correct. Testing injectors (2 )
it is a boat and not running correct. Testing injectors (2 ) they are suppose to read 230 barr and actual reading 260 barr. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,750 satisfied customers
1970? Mercruiser 165 in a 1970 Tri Hull Thunderbird boat
1970? Mercruiser 165 in a 1970 Tri Hull Thunderbird boat won't stay running. See video here https://www.youtube.com/watch?v=MBYia1Gdn9cI'm trying to get this running, and need to know why it is cuttin… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,750 satisfied customers
Want to swap 12o hp omc engine with 140hp omc engine. Will
Want to swap 12o hp omc engine with 140hp omc engine. Will they interchange … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a year old dragonfly 5 unit installed. It turns on
I have a year old dragonfly 5 unit installed. It turns on with the main 12v boat switch to show the dragonfly name, but will not accept any input from the panel buttons, including the power off button… read more
Boat Doc
Boat Doc
122 satisfied customers
Looking for suitable outboard for one off design 6.5m
Looking for suitable outboard for one off design 6.5m aluminium catamaran weight around 2200 kg. calculated power needed for my usage around 210hp. Evinrudes seem to have two versions of E-Tec G2 66 d… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,750 satisfied customers
It is a 2006 rxtsupercharged sea doo it beeps all the time
it is a 2006 rxtsupercharged sea doo it beeps all the time until we unplug the battery … read more
Boat Doc
Boat Doc
122 satisfied customers
Which lowrance hook 4 series has all the bells and whistles?
Which lowrance hook 4 series has all the bells and whistles? I don't want to buy one and then realize I should have got a better 4 series and I just didn't research enough, I plan on using it on a lar… read more
Boat Doc
Boat Doc
122 satisfied customers
Boat went aground hard. surveyor is recommending that the
boat went aground hard. surveyor is recommending that the keel be rebedded. Boat lifted and no evidence of damage to structure, no movement in keel when swung against. No loose bolts and no leakage. r… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,750 satisfied customers
I have a 1996 140hp Nissan Outboard motor. I put it in the
I have a 1996 140hp Nissan Outboard motor. I put it in the water last week and it ran fine from idle to 4700rpm. I put it on the lift and next week it started fine and idled fine although it's running… read more
Boat Doc
Boat Doc
122 satisfied customers
Changed the gimbal ( had to take motor out) re-installed but
changed the gimbal ( had to take motor out) re-installed but something nor right Jump the solenoid and it starts from the key, no start. all wires back properly … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,750 satisfied customers
I have a 2003 70 hp outboard that starts and runs for about
i have a 2003 70 hp johnson outboard that starts and runs for about ten minutes then dies and wont restart … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
15,750 satisfied customers
Have a Mercruiser 350 engine, all of sudden it just started
Have a Mercruiser 350 engine, all of sudden it just started to notice smoking from both exhaust. Smoke a greyish colour and worse when idling. Engine still runs fine no power loss except at same time … read more
Boat Doc
Boat Doc
122 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