mikuni superbn44 switching from choke to primers, how to seal up other hole?

T

t0mmy91

Location
18940
Hello all, i hope all is well. let me know if this is not the correct area to post this. i couldnt find an exact matching area to post this. i have 2 1995 waveraider deluxe 700, a1995 wave venture 700, and a 1997 wave venture 760. they all currently have chokes, and i bought primer kits for them. i plan to remove the choke plates and shafts to install. 3 questions for those of you who have did this:
1. which fuel line did you tap into. i have read multiple different theories on reserve OR return lines
2. how did you seal you primer fittings into the carb as i read they are loose fit? jb weld?
3. what did you use to seal the other unused hole in the top of the carb from the choke shaft? RTV, jbweld?
 
WFO Speedracer

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
Don't do it , if you do you will be replacing primers and primer lines every year from now on , all of those skis starting problems can easily be fixed by readjusting the low speed screws and ignoring the factory settings.

Turn the low speed screws out about 1 1/2 turns , at this point it probably will not idle correctly so readjust the idle speed screw so it will idle , what you will find is the soggy bottom end is now gone and the skis will now start without the choke , why does this work , it works because the factory settings were way too lean, they were set for emissions, not for performance.

Most of the time 1 1/2 turns does it , occasionally you may have to go out or in 1/4 turn from there, I always water test the ski after I reset it to see where it needs to go , if you turn the ski off and let it set for a few minutes and it restarts cleanly without having to give it throttle you are good to go , if you do have to hold the throttle open to start it go in 1/4 turn at a time till it starts cleanly.

As I said you have to readjust the idle so it will idle correctly, I have literally done 50 or more skis like this and usually they will start with no choke or very light use of the choke.
 
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T

t0mmy91

Location
18940
WFO Speedracer said:
Don't do it , if you do you will be replacing primers every year from now on , all three of those skis starting problems can easily be fixed by readjusting the low speed screws and ignoring the factory settings.

Turn the low speed screws out about 1 1/2 turns , at this point it probably will not idle correctly so readjust the idle speed screw so it will idle , what you will find is the soggy bottom end is now gone and the skis will now start without the choke , why does this work , it works because the factory settings were way too lean, they were set for emissions, not for performance.

Most of the time 1 1/2 turns does it , occasionally you may have to go out or in 1/4 turn from there, I always water test the ski after I reset it to see where it needs to go , if you turn the ski off and let it set for a few minutes and it restarts cleanly without having to give it throttle you are good to go , if you do have to hold the throttle open to start it go in 1/4 turn at a time till it starts cleanly.

As I said you have to readjust the idle so it will idle correctly, I have literally done 50 or more skis like this and usually they will start with no choke or very light use of the choke.
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ok, sounds good, i will try that. a couple follow up questions just to be sure i got it right:
so for 3 of the 700 skis, the 700 factory settings with sbn38's low speed screw is 5/8 +- 1/4 turn.... your saying go to 1 1/2 turns on both carbs correct on the low speed, and leave the high speed at factory?
also, for the 4th ski, wave venture 760, with twin sbn44mm carbs, the factory settings on the 760 are high speed 3/8 +- 1/4 turn, and low speed 1 5/8 +- 1/4 turn out. what are your thoughts on that ski? richen up the low speed an addition 1/4 or so maybe?
 
WFO Speedracer

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
No I am saying go out 1 1/2 turs from where they are at right now, which is why I said totally disregard the stock settings , yes they are set that lean, trust me.
 
SteveC

SteveC

Location
West MI
WFO Speedracer said:
you will be replacing primers and primer lines every year from now on
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This. The lines typically fail, but I think if you spend enough and buy aircraft fuel line or something, that part might be solvable. The real problem is the primers failing themselves and/or a potential air leak into the furl line. I installed primer on two SJs before knowing otherwise, and regret both. Some folks say that being able to burst fuel in helps in surf if the ski gets water into carbs, and I’m not saying they are wrong, but not having experienced that need but having experienced failed primers, I regret it.
 
T

t0mmy91

Location
18940
SteveC said:
This. The lines typically fail, but I think if you spend enough and buy aircraft fuel line or something, that part might be solvable. The real problem is the primers failing themselves and/or a potential air leak into the furl line. I installed primer on two SJs before knowing otherwise, and regret both. Some folks say that being able to burst fuel in helps in surf if the ski gets water into carbs, and I’m not saying they are wrong, but not having experienced that need but having experienced failed primers, I regret it.
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yea thats a perspective i didnt think of, thanks for sharing :)
 
WFO Speedracer

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
On some skis yeah they probably need a primer on yours they don't, I have repaired way to many of those skis where the customer complained that they just would not start or they almost ran the battery down before it started , 99% of the time when retuned they would start without the choke before you could get your finger off the start button.
 
fx1mark

fx1mark

Location
Alabama
SteveC said:
This. The lines typically fail, but I think if you spend enough and buy aircraft fuel line or something, that part might be solvable. The real problem is the primers failing themselves and/or a potential air leak into the furl line. I installed primer on two SJs before knowing otherwise, and regret both. Some folks say that being able to burst fuel in helps in surf if the ski gets water into carbs, and I’m not saying they are wrong, but not having experienced that need but having experienced failed primers, I regret it.
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You have had one of these fail? I haven't.
 

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WFO Speedracer

WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
fx1mark said:
You have had one of these fail? I haven't.
Click to expand...
I have a stack of them here , you can take them apart and replace the o-ring on them and sometimes they will work again but on my skis that have primers I use these , they usually last 4 or 5 years before the bulb wears out.

BTW they do seem to last longer on skis that run premix , I am assuming it prolongs the life of the o-rings somewhat.

On Something like an XLT 1200 pv engine I wouldn't hesitate to install a primer, those are ultra lean and notoriously hard starters , but I leave all the choke plates and shafts intact and tee into the accell pump lines that are already there.

On an XLT -GP 800 or the 1200's for that matter if you remove the plates and shafts the ski will no longer plane out and run properly, I know I have repaired many where people did exactly that.

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Roseand

Roseand

The Weaponizer
Site Supporter
Location
Wisconsin
Don't waste your time with a primer especially on a couch that doesn't see any water injestion. Even on my freestyle ski I take a flame arrestor off(already off because I fog it after every ride) and hand choke it and it's good for the day.
Primers are best for surf skis and skis that gulp a lot of water. Not worth the headache or time on your skis.
 
T

t0mmy91

Location
18940
Roseand said:
Don't waste your time with a primer especially on a couch that doesn't see any water injestion. Even on my freestyle ski I take a flame arrestor off(already off because I fog it after every ride) and hand choke it and it's good for the day.
Primers are best for surf skis and skis that gulp a lot of water. Not worth the headache or time on your skis.
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sounds good, thanks! ill try and richen up the screws a bit and see if that works.
 
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