1200 YAMAHA NPV CYLINDER TOP END INSTALL AND CARBURETOR ADJUSTMENTS

[@shannonwilliams601]

I run a jet ski shop in Fort Worth Texas I've been building these motors for over 20 years and makes your life much easier with the Piston Ring inserts to wrap them with thin layers of velcro tightly and then you can just slide the headright on one person velcro will slide off as the head slides on and then just under the velcro from around the rods

[@5StarPWC]

good idea!

[@dahatchery]

I rebuild dirt bikes, what would help a lot is applying some 2 stroke premix to the cylinder walls making things easier to slide in.

[@costasgeorgiou5015]

When I build these motors (sometime even in the hull) I always start with cylinder 3 for the first piston I put in jugs. So much easier (also do it without help) try then your next time. Good video.

[@shannonwilliams601]

Use Velcro straps to compress the piston rings on all three then slide the headright on your welcome for that piece of hundred-thousand-dollar advice

[@A-mechanics-review-4U]

Giant zip ties work better than Velcro just pull it tight on the piston obviously covering both rings at once then once it’s just far enough up in the cylinder with the extra piece having already been Cut off, cut the zip tie and pull out I did this on a GPR 1300 front cylinder without taking offThe middle cylinder

[@shannonwilliams601]

@@A-mechanics-review-4U giant zip ties will not pull perfectly round also they are expensive the velcro you can use over and over velcro is far better

[@TheStephenspann27]

Permatex Copper Gasket spray is where it's at for the head gasket. Takes like 30 seconds and done.

[@cerv7077]

Great Video, answers most of my questions. I’m currently rebuilding 2x Yamaha Triples non-power valve, on my Exciter 270. It’s my second rebuild in a year. Is the high and low jet adjustment just for the break in period?

[@AimeMOfficial]

where are you located??

[@5StarPWC]

Michigan

[@AimeMOfficial]

great. need to bring my boat for service, give me a call seven 0 8 eight six four 1 zero five 2

[@AimeMOfficial]

hello please let me know if i can bring my yamaha ls2000

[@Cmolejon]

is this doable with the engine in the ski? i have a 98 yamaha gp1200 that has low compression on all 3 cylinders. I want to take it apart and replace rings (and pistons) if needed.

[@5StarPWC]

Its is if u have a second person..

[@Cmolejon]

@@5StarPWC yes I have a second person. Is the sbt kit good? How do I determine the mm bore over? Is that just of there is damage in the cylinder walls? I just want to hone and replace.

[@5StarPWC]

@@Cmolejon better to call 2482217942 during business hours

[@jbk2500]

@carlos I’m in the same boat....lol actually LS2000 and center piston scorn from loose oil line. Researching to do in hull cylinder and three piston replacement. Not sure if I can get away with just a hone. 120-0-120 compression

[@tomhealy9718]

@@jbk2500 I have the same boat with the same exact issue. Center piston zero psi, all others 120. What was your outcome?

[@javierr1blue]

where do you buy the pistons

[@shannonwilliams601]

Sbt.com

[@joseacd01]

Im replacing the stator on this gp1200 do i have to worry about timing?

[@5StarPWC]

no its simple on this engine

[@bigjimar77]

I have one cylinder with no compression. Pulled the head big gap in the piston. Probably .015 gap. Do I just replace the single piston and ring?

[@5StarPWC]

No sorry. We do all 3

[@racin4ds]

I've professionally built engines of all types for 20+ years and we have never used red loctite on a cylinder head bolt!!! I lost all confidence in you when I saw that...

[@reecejones1248]

i was about to say ive never seen anyone use that ever, i was wanting to see one of these comments lol

[@joseacd01]

I just put my engine together gp1200 new piston new rings and im ony getting 90 psi in two holes the third one front one is giving me 75 also the cylinders were honed by a professional any suggestions

[@5StarPWC]

did you bore the cylinders Jose?

[@5StarPWC]

probably they are a loose fit.

[@joseacd01]

@@5StarPWC what do you recomend me doing in this case?

[@5StarPWC]

@@joseacd01 CALL 248-221-7942

[@user-ym9wb2mk5e]

Hi. Thanks for posting, very helpful! I bought a used 2001 xl800. Front cylinder piston has small amount of scoring, chip in top of piston, rear cylinder is fine other than a bit of slop. Measured with micrometer, front measured 79.67mm and rear was 79.95mm. Looks like stock nikasil, so I should be able to just order standard pistons and light hone? Thanks!

[@5StarPWC]

Yes, that should work but you should be looking at your carbs also.

[@user-ym9wb2mk5e]

@@5StarPWC Thanks. After removing heads, that cylinders piston was chunked and severly gouged the lower cylinder. Couldnt see it when I originally posted because I hadnt removed heads at that time. I purchased some stock pistons, one new iron sleeve, and will have a local machine shop insert sleeve and hone. I bought the premix block off kit and mikuni 44 rebuild kits also. Thanks again for the vid!

[@A-mechanics-review-4U]

@@user-ym9wb2mk5e I’d love to know if you ever got an iron sleeve in the nikocyl cylinder?

[@user-ym9wb2mk5e]

@@A-mechanics-review-4U I did. Had a local guy do the work. It’s back together, but running lean on that cylinder. Will be rebuilding carbs and checking for leaks. Psi on cylinder is fine. Sleeve and piston kits were ordered off of EBay and worked fine!

[@krotchlickmeugh627]

@@user-ym9wb2mk5e putting. Steel sleeve into an aluminum cylinder is one thing. When its one cylinder. In a 3 cylinder with just one with a steel sleeve? You sold it by now didnt you?

[@nightdipper5178]

Best way to apply any Gasket Maker or Engine bond is to use an industrial syringe. Much more control and much cleaner bead. The syringes with the industrial flat tip needles are less than 1$ a piece on amazon.

[@5StarPWC]

thanks for the tip

[@kennyadkins1489]

do you have a video on how to remove the carbs and clean them ?

[@cerv7077]

kenny adkins. I would suggest Yamaha Jet boaters.com, it’s a forum that helped me a ton when I had questions for my rebuild. Just check under the Yamaha 2 stroke topics.

[@davidcruz-ov7qp]

Is there anyway u can send me a copy of the carb adjustment sheet I have a gp 1200 and a gp 800r

[@TheDarkllord666]

How much for a resleeve for non power valve 1200

[@5StarPWC]

I would need more info, please call 248-221-7942 EST thanks again.

[@joshuabanwaree2640]

Would u sell your carb cheat sheet ?

[@5StarPWC]

I can email it

[@angelrodriguez777]

@@5StarPWC would you send to my mail the card cheat sheet

[@RealSuburbanCowboy]

I wouldn't use anywhere near that much rtv. It gets in the engine and messes up things. If anything, I coat the gaskets in grease. If you ever need to take the engine apart again, the gaskets come right off.

[@5StarPWC]

No dude, it won't hurt, it will spit that soft RTV right out, at worst it will get on an electrode on the spark plug.

[@joseacd01]

Thank you

[@rogeriocobianchi1791]

seri possível me passar a tabela de tork usada nesse motor.

[@raymaresh1712]

The vidio won't even play.

[@greggjarvis133]

Yeah try doing that triple cyl install while in a ski

[@5StarPWC]

not good.