1997 GTI Carb (Settings Needed) and thoughts on issue Please

[johnbouy]

Ok well i want to make sure what the actual settings should be at to start on a 97 GTI 717.

The shop manual states the low speed at 1 3/4 out and High speed at 0.

But if you look at other reference charts like seadoo source carb reference chart is states.

Low speed at 1 out and high speed at 1 1/2 out.

What is the proper setting?

I am having problems right now with a bog i guess you call it. I had the pop off at set at 30 and it has like a 6 second delay when you hold the throttle down then it feels like the pop off popped and it goes fine if you hold the throttle. but if you let off and try again its the same thing or may get worse the more you try.
So i thought i would lower the pop off down to about 24 and initial take off was pretty darn close to snappy, but once again i let off on the throttle and try again and it bogs for 6 or more seconds then takes off.

I have rebuilt carb with genuine mikuni kit. Changed all the jets and needle/seat to be sure they are to spec and same issue.

Oh i have also changed the fuel selector. Compression is 140 on both cylinders.

So tonight i have changed all the fuel lines (They were black not grey) to clear lines so i can see if i am possibly getting air bubbles. I replaced the vent lines and verified with gauge the relief valve opens between 3-5 lbs pressure. Changed the pop-off back to 30 as i believe it was to low and leaking fuel. I noticed the lever for the pop off wasn't level to the housing.

Is there anything else i can look at before i start this thing and try another water test?

Any suggestions is good, cause i'm going crazy why this isn't working.

TIA

 

[TLH101]

I have a '97 GTS, with a 717, and went thru the same dilemma. Then I noticed the spec sheet was dated 2003, so after a lot of posts on the boards, and wide rage of answers, I went with the settings on the spec sheet (1 & 1-1/2). My ski runs perfect and transitions good.

 

[mikidymac]

TLH is correct. Go by the seadoo source specs. The manuals are typically printed 6 months before the skis are released and there are some factory changes in that time. The 1997 GTI should be H= 1-1/2, L= 1.

 

[johnbouy]

ok i will change them, Just didnt think the High would be out more then the low as you stated. I think since i did a fuel and air line swap i should do a pressure test of the lines. Do i just remove the fuel return line and put pump to that line? do i need to block another line? how much pressure? 3lbs?

Thanks

 

[johnbouy]

well even after doing everything and putting settings out to L=1 and H=1 1/2 and rev out of water still getting terrible bob on take off, wait 3-6 seconds and goes like hell. Tried moving the high and the low 1/8 turn at a time and still the same or worse. Seemed it worked the best at the first setting except for the bog. Starts better then it ever has though after i did the above to it. Lines and testing.
But i can't get rid of bog.
DO any GODS have a thought to why this is? Can a Rotary valve cause this? I just don't know where to look anymore?
TIA but very frustrated.

 

[kevinz]

something i've often wondered is exactly how much of a bog is normal? i have a 97 gti so i know that carb doesn't have an accelerator pump. when you open the throttle, there is a sudden rush of air into the engine yet no accelerator pump to provide the needed quick shot of raw gas to neutralize that. My 96 and 97 both have a very slight bog off idle, but both have perfect looking plugs and have run flawlessly with no ill effects. thus, i haven't chased it and doubt i ever will. coming from the automotive world, where carbs have accelerator pumps to deal with this very issue.

maybe someone here with more knowledge can chime in?

 

[johnbouy]

Well my bog lasts about 6 seconds then goes. that is def more then it should be lol. i am thinking of swapping the carb off my 03 gti which has an accelerator pump to see if that is all it is.

 

[drewski]

Faulty fuel jet? Obstruction in the fuel jet?

 

[mikidymac]

On my 03 GTI i rebuilt the carb twice to get rid of an off idle bog and everything was perfect but it never went away. I have been doing this for a long time so I know what I am doing. I finally bit the bullet and bought a new carb and the ski has never run so good.

 

[FaceDeAce]

Never ever known a basic naturally aspirated carbed 2 stroke engine that didn't have some hesitation if you just punch the throttle to full and hold it there. As with ANY strung out and piped 2 stroke - when you drive these things you have to "pump" the throttle a little to jump off of idle to get things flowing and glowing. Think like a dirt bike or snowmobile or chainsaw.

Try this ... On take off blip that throttle to half in 1/4 sec jolts, three times, THEN goto full. Waa waa waa waaaaAAAAWWWWAAA A A A A.

Just the way it is with these carbed and tuned piped blow boxes folks. Tune the needles for your driving style and the best snappy response knowing this characteristic.

If you are expecting "instant" response... Well sorry, it is not the machine but is your expectations that are off base. You just are not going to get that without a full EFI and CDI tuned rig.

 

[johnbouy]

i can deal with some hesitation, thats understandable. but this is beyond fluttering the throttle. It wont pick up speed unless you hold it to the pin. It had the slight hesitation before as you stated and i was fine with that, so i understand what you are saying. But now its just bad. Like i said before it will go fine after about a 6 count in your head with myself on it, but if you have a passenger on the back 80% of the time it won't lose the bog and just go about 10 miles per hour trying to get on plane.
I have a 03 gti with a 717 with an accelerator pump with main 167.5 jet and pilot 75 Spring 80g. The 97 has main 175 and pilot 70 and spring 130g.
Would i have to change the the main, pilot and spring over as well or just slap carb on and see what happens? Would i use the same settings also? low 1 high 0 that it recommends for the 03 when i try it on the 97>?
Sorry for all the questions. i am just running out of ideas and if i could swap carbs and find out thats the problem i can order a carb and kids can be happy again lol

thanks

 

[drewski]

accelerator pump is prob the issue. Thats what gets it going. check it for proper operation. or throw money at it replaceing parts until it works correctly.

 

[johnbouy]

UHm no, i said i was going to use the carb from my other 03 gti with accelerator pump on the 97. the 97 doesnt have one.
Wanting to know if i can use one.

 

[drewski]

missed that, sorry. low speed jet is clear? Sounds like youre carb still needs a cleaning. passages got a booger in them or something in youre low speed circuit. you missed somthing. good luck.

 

[johnbouy]

missed that, sorry. low speed jet is clear? Sounds like youre carb still needs a cleaning. passages got a booger in them or something in youre low speed circuit. you missed somthing. good luck.

Well I think I might have found the problem, but its was sure one cause due to my bog i'm sure.

I watched a youtube video and the guy said this bog was caused by a leaking front crank seal, and it did basically the same thing my ski was doing. Hesitate on take off for a bit then go like a scared rabbit.

So I took the front flywheel cover off and oil leaked out. SO ordered a new gasket and oil seal and last night a buddy of mine tore it all apart to change seal. Well we get it apart and he looks at me and says well there's good and bad lol, He goes the good is it will be no problem to get the seal out. The bad there was never a seal there. LOL.
Its just hard to believe when someone rebuilt it they missed that, and basically good I never blew it up over the past year and half running it. Well it was too late last night to try it out, but I am feeling good that I might have finally beat this damn machine and it should run proper now.

Stay tuned, I will post my results for future posters if they had same problems.

Wish me luck lol

JB

 

[johnbouy]

Well I finally got it out and yahoo, that was the problem. The machine runs great and throttle response is there at every speed now. This machine finally runs the way it should. I was ready to sell this damn machine as I have spent way to long trouble shooting this damn thing and just about had enough, but I hate to get beaten lol. But I think I will keep it now as I have basically re-hauled the whole thing trying to trouble shoot it. I think this machine should last the kids awhile now. Plus the machine is in mint shape.
Hopefully this post will help someone in the future if they have a bog they cant get rid of,
THX
JB