Ski wont rev up!
- Thread starter norcal ex
- Start date
norcal ex
X-H2
- Location
- San Jose, CA
its the top that has the problem, so shouldnt i up the main to 140?
norcal ex
X-H2
- Location
- San Jose, CA
i toook it out today and it still ran like ******** with different carbs and the protec head. i took it out of the no wake zone and i hopped the ski a little and it took off and rode like normal after half RPM then as sooon as i let off the throttle and let it idle down and tried to grab the throttle again, it died. then i hopped it and it was fine after half RPM. soooo i am thinking about going 80/140 jets.... does this sound good?
jetskier79
I'm goin' for two
- Location
- San Diego, CA
you should probably just give up and slap a single carb on it
norcal ex
X-H2
- Location
- San Jose, CA
haha, i should, but i dont have a manifold
I've been advising you to up your pilots to 77.5 and your mains to 140 for a while now...try it out.
norcal ex
X-H2
- Location
- San Jose, CA
shouldnt i just go to 80? if its not running with 70 then it obviously needs a lot more gas (if that is the problem)
Not necessarily....as mentioned above, the margin between running and not running can be only one jet size in cases. I recommended 77.5 because that's what I ran on a ported 701 with dual 38's and a drypipe.
But you are correct...start with 80's and work your way down.
But you are correct...start with 80's and work your way down.
norcal ex
X-H2
- Location
- San Jose, CA
shoot, i should just buy every size haha. Are these the same jets that are in muniki carbs for dirt bikes and quads? my buddy thinks they might be, but ive never heard that.
No, they are not These are SBN specific jets (those are made stricly for marine stuff
You're in California, give Jetworks a call...I bet they could help you out. www.jetworks.net
You're in California, give Jetworks a call...I bet they could help you out. www.jetworks.net
norcal ex
X-H2
- Location
- San Jose, CA
alrite, i ussually do it through protec, is jet works betteR?
norcal ex
X-H2
- Location
- San Jose, CA
jets are comming in tuesday
norcal ex
X-H2
- Location
- San Jose, CA
ok, got it rejetted and took it to the water 80/140 it deffinatly seemed much better. it still has that loaded up feeling at the bottom and then when you lay on it for two or three seconds it will take off and feel fine at top.... any ideas? i messed with the jets a lot. when i put the top in more( less than 1 1/2) if wouldnt rev up. when i leaned the bottom screw out more it wouldnt rev up as good either....:banghead:
The bottom screw (Lo adjustment) is not to be used for throttle response.
First of all, put the boat in the water on a trailer (pump in the water)
Start the engine and let it idle.
Adjust both low speed adjusters to obtain the highest idle possible (without touching the throttle or anything like that)
Then take out the boat, run at 1/4 throttle for about 30-60 seconds.
Then gas it and see what happens.
If it stumbles, you need to increase the pilot jet size.
If it simply doesn't rev and takes a while to clear out, you need to decrease the pilot jet size.
Once you have that sorted out (and jetted properly), repeat the low speed screw adjustment.
Then go to 1/2 throttle and cruise at that for 30-60 seconds.
Gun it, see what happens.
Same as above, adjust your mains accordingly. You don't necessarily have to rejet here, you can use your hi speed adjusters.
First of all, put the boat in the water on a trailer (pump in the water)
Start the engine and let it idle.
Adjust both low speed adjusters to obtain the highest idle possible (without touching the throttle or anything like that)
Then take out the boat, run at 1/4 throttle for about 30-60 seconds.
Then gas it and see what happens.
If it stumbles, you need to increase the pilot jet size.
If it simply doesn't rev and takes a while to clear out, you need to decrease the pilot jet size.
Once you have that sorted out (and jetted properly), repeat the low speed screw adjustment.
Then go to 1/2 throttle and cruise at that for 30-60 seconds.
Gun it, see what happens.
Same as above, adjust your mains accordingly. You don't necessarily have to rejet here, you can use your hi speed adjusters.
norcal ex
X-H2
- Location
- San Jose, CA
well i adjusted my high speed adjusters as much as possible. i have it so it is running its best but it is still not good. it has no low end! you have to sit on the throttle for 2 or 3 or 4 seconds until the ski will rev up and go.... so should i put the 77.5 pilot jet in?
No.
You really need to take the time to tune the carburetors. Don't just throw parts at it, make some guesstimated adjustments, and hope it runs right.
Tune the carburetors.
For more detailed instructions, check Mikuni's tuning manual.
You really need to take the time to tune the carburetors. Don't just throw parts at it, make some guesstimated adjustments, and hope it runs right.
Tune the carburetors.
For more detailed instructions, check Mikuni's tuning manual.
Last edited:
norcal ex
X-H2
- Location
- San Jose, CA
i know how to turn carborators. i spent an hour at the lake doing it today. i got it to run the best it could and it still feels loaded up.... do you think something else is wrong?
I think your carburetors are not tuned right.
If you adjusted only the hi and lo adjusters to get it to run the best it could, then I think your tuning procedure is lacking.
You need to take the time to do it right.
If your procedure of tuning the carbs was different from the basic outline of what I described, you didn't tune them.
Maybe I misunderstood you, but I thought you said you adjusted only hi and lo adjusters. Is that right?
If you adjusted only the hi and lo adjusters to get it to run the best it could, then I think your tuning procedure is lacking.
You need to take the time to do it right.
If your procedure of tuning the carbs was different from the basic outline of what I described, you didn't tune them.
Maybe I misunderstood you, but I thought you said you adjusted only hi and lo adjusters. Is that right?