Newbie need help with SJ '08

[karimi]

Hi everyone, I am from Bahrain which is a small country in the Middle East i just started to gain interest in freestyle stand up jetskis. I recently bought an SJ '08 and had the following modifications purchased all from wamiltons. I know that obviously someone has already asked this question and I am sorry for asking again and I have no knowledge at all in mods so I used wamiltons first six steps in modifyin my SJ'08. As well as i have no idea in installing my mods so the yamaha dealership here does everything for me but they're not that experienced in mods and I am worried that either they haven't tuned my SJ'08 properly with the mods or i need some extra mods. The reason i am stating this is that, after installing all the mods mentioned below, I still can't get enough air to perform a barrel roll, the most i can do up to now is submarine my SJ and just hit wakes off of boats and land sideways. Plus I noticed that some people order parts from a website called blowsion. Are they better than wamiltons? or should I just stick with wamiltons and I'll be fine? Do I need to modify my jetski a bit more and if so, what would be the next steps? If I need to learn to tune my engine with mods, is there some sort of tool that can help me prefect the tuning?
Here are my mods and some input would be amazing. Once again sorry if this thread or question has been repeated or boring. Thank you and I am looking forward to meeting members here and learning from them as well as sharing my experience.



Step 1:
- WX-1 Wamiltons Intake grate (freestyle)
- Skat-trak 12/17
- Wamiltons Ride plate
- Wamiltons Stubbie cone.

Step 2:
- ADA head kit
- MSD enhancer
- Bilge pump dual kit

Step 3
- V-force Reeds
- Wamiltons flame arrestor air filter w/ adapter
- U.M.I steering system w/ shortened turn place & 0 degree handle bar.

Step 4
- Factory "B" pipe wammer mod

Step 5
- Freestyle combo kit (rickter foot holds and matkit)
- Scupper Valve

Step 6
- '08 Wammer kit (2 hand hold freestyle hood and nose piece)
- Pivot bracket w/ mounting hardware.

Other:
- SJ trim system
- wamiltons chin pad
- RRP Handle pole & RRP 2 hole bracket.

 

[rrlc]

Wamiltons makes very good stuff and by the list of the mods listed, that ski should rip pretty hard.

I'd try to find somebody that knows what they are doing and have them tune it for you (not the Yamaha dealer...they are usually idiots).

 

[SkiNaked]

Move the B pipe to stage 1. Everything else looks good.

 

[rrlc]

I think he meant that he had ALL the mods done at once. :dunno:

 

[karimi]

Actually yeah, I installed all the mods at once! was that really stupid??

emm what do you mean by moving it to stage 1? like setting something to stage 1??

sorry guys as i said, i just started and have no clue on what to do. Thanks for the help and the patience.

 

[rrlc]

Doing all the mods at once is cool. I think he thought that you were doing these mods in stages and to add that b-pipe to the beginning stages.

Do you know what jets are in your carbs?

 

[stanton]

practice!
you got a great ski, ride it until your arms fall off!

 

[karimi]

Ok I know what carbs are, but when you say jets? what are the jets exactly, like that do they do? purpose?

emm I dont think I have jets because anything I changed was mentioned in the list above.

I have been looking on wamiltons page and thinking of getting a bigger bore w/pistons and some bigger carbs, do you guys advice to do so or just wait for a bit and make sure the setting on my SJ is ok?

 

[karimi]

Thanks stanton, yeah I've been practicing hard, but the problem is we don't get waves like yall do in the states man.

 

[stanton]

jets are the part of the carb that control the air/fuel ratio at certain rpms, different modifications to the motor will need different ratio to be perfect.
you need to change your jetting.
more power is always good, i would reccomend running that for a while, once you get it running right. then step up to a big bore motor package from a engine builder. the 860 powervalve motor would be a great engine for that ski.
http://www.xmetalworks.com/performance.html

 

[rrlc]

you need to change your jetting.

Yup. What he said.

Probably start out with 72.5 pilot, 135 main and tune from there. (That was the advice given to me.)

 

[jetpilot08]

I wonder if they took out the tamper proof caps?

If not get a hold of john at Jet Ski Solutions. He offers a service to remove caps and install billet mixture knobs. He could also check the jets to make sure they are the correct ones for your b pipe.

 

[karimi]

ok so basically i dont need to replace the jets, by changing the jetting you mean only tune the jets and try to get the perfect ratio, right? and after I got the perfect tune than maybe move to a bigger bore engine. I used to motocross and there was a screw next to the carbs where you tune the engine rev or ration, is that the same as the jetting? like just turn the screw around till you get the perfect ratio?

jetpilot, what are tamper proof caps? billet mixture knobs, what are those and purpose? emm i would call john at jet ski solutions but I am all the way in the Middle East do you think he can talk me through it on the phone although he might get a bit frustrated for my lack of knowledge oh and you said make sure the jets are the correct ones for my b pipe so you mean I need to actually get new jets to match my b pipe?

 

[karimi]

oh yeah and what about a fly wheel charge, I heard alot of people get more power from their pipe when they add the flywheel. what do you guys think?

 

[stanton]

you do need to replace the jets. the screw adjustment is only for fine tuning. the carbs come tamper proof so you cant make adjustments, john at JSS removes them and adds the screws.
i dont know about power gains from a flywheel, i dont think thats true. you will get a quicker revving ski. has nothing to do with the pipe.

 

[karimi]

ok I found jetting for 38mm carb on wamiltons website, but here are some questions.

If i change to bigger carbs does that mean I have to get different jettings?

And if I am planning to change the bore size does that mean i have to change the carb size as well or its not necessary? and what about the other way around?

and should i purchase a mikuni high volume racing pump or am I just getting to excited about modifying?

With the Mods I listed in the beginning of the post, should I be able to do barrel rolls or back flips or is the jetski not modified enough to do those kind of tricks yet?

 

[rrlc]

I'd just stick with the stock carbs for now. You need 72.5 pilot, 135 main jets. Find somebody that knows how to tune a ski and have them replace the stock jets with the ones I mentioned and tune it from there. Your setup is great and the ski will really rip when it's tuned correctly.

Backflips and barrel rolls have been done on stock skis before. It's all about skill and technique. Just have fun and don't rush yourself into crazy tricks.

 

[waterfreak]

you do need to replace the jets. the screw adjustment is only for fine tuning. the carbs come tamper proof so you cant make adjustments, john at JSS removes them and adds the screws.
i dont know about power gains from a flywheel, i dont think thats true. you will get a quicker revving ski. has nothing to do with the pipe.

You can drill out the brass caps and make adjustments with a small flat screwdriver. It's really not a big deal.

You can also cut your ride plate flush to the hull. This greatly helps the o8 hull become looser and more playfull.

Another good tip is to replace the steering cable with an o7 or less cable. Also, move the ball joint at the steering turnplate to the last hole. These mods will give more throw which is what you need to get the ski to roll.

You me a call or e-mail...I'll be happy to answer any questions you may have

 

[karimi]

ok thanks guys, I'll try to get the main jets that rrlc mentioned and probably order a pop off guages to helpe me tune the jetski. Thanks for your help guys, but don't worry I'll probably have more questions in the future cheers.
oh and waterfreak thanks man, I'll call you if i need help. thanks once again

 

[karimi]

rrlc are you sure about the numbers cause this is the only thing I found on wamiltons site.

Stock CylinderPorted Cylinder2 - 95g Springs2 - 95g Springs2 - 75 Pilot Jets2 - 75 Pilot Jets2 - 130 Main Jets2 - 135 Main Jets

plus my engines arent ported yet so why would i use 135 main jets, not doubtin your advice man just need to learn why? Plus why 72.5 rather than the 75 pilot jets cause its the same for stock and ported?