Perplexed Fast strike

[basscat21]

J150GLEDB
G 04141990

when cold, will start Idle fine, hit the throttle off you go and runs well.

Fish a while and it starts, idles fine, put in gear, stalls. I can get it to go if I hit the primer.

So far replaced:

Rebuilt carbs, and new bowls, also new Port manifold gasket to get to the little cover.
Rebuilt the VST tank, needle, seat float and gasket
rebuilt VST pump
replaced the VRO
new fuel filter, gasket, o ring and cap.
Rebuilt the maintenance valve, gasket and cover
new Plugs champion QL78YC (.30)
New Power pack omc
Plug wires ohm-d correct
Coils ohm-ed correct
New OMC bulb, new fuel line.
Throttle roller cam adjusted
de carboned.
butterflys on manifold all open correctly.
Thermostats replace last year.

Compression
Port starboard
110 115
110 110
100 100

What to check next?

Given its a 96, I did not mind replacing parts as I chase this, the carb really need new gaskets.

Thank you,

[JoePA]

How many turns out on the Idle air/fuel adjustment screws? I think factory setting is 5.5 turns out?

[ChampioNman]

Initial setting is 5 turns out from a soft stop. they've been known to be adjusted out to 7 full turns.

[basscat21]

Initial setting is 5 turns out from a soft stop. they've been known to be adjusted out to 7 full turns.

Will this have an effect on the in gear stall? initial idle is up about 1100 and settles down to 800.

[ChampioNman]

Nope, 1100->800 coming out of QUICK start.

[basscat21]

I put a clear tube between the fuel line and the fuel filter on the fuel bracket. Ran motor on muffs, gas was clean coming through no bubbles. I put a auto fuel pressure tester (goes to 100psi) so looking for 5 is tough. Once connected between the VST barb and line to fuel rail, bulbed pressure up to 15. Started motor the pressure stayed for 15 seconds then to zero.
I did rebuild the VRO diaphragms both sides. And the diaphram and gaskets on the vapor pump and tank gasket needle, seat. I see no leaks.

Some how its not pumping fuel out of the bracket?

What next?

And thank you, for the assistance!

[suzukidave]

looks like you've done everything but the stator.

something bad in the wiring harness maybe.

edit: missed last post. does the bulb stay hard?

[ChampioNman]

Bite the bullet and install new float bowls and carb kits.

[basscat21]

Bite the bullet and install new float bowls and carb kits.

ChampioNman- Completed full rebuild, bowls the flat gasket on the throttle bodys.
Concern is there is no pressure in the lines from VST tank to the fuel rails.

[basscat21]

looks like you've done everything but the stator.

something bad in the wiring harness maybe.

edit: missed last post. does the bulb stay hard?

Not hard as when you pump, but 1-2 squeezes it hard. New bulb-OEM BRP.

[ChampioNman]

ChampioNman- Completed full rebuild, bowls the flat gasket on the throttle bodys.
Concern is there is no pressure in the lines from VST tank to the fuel rails.

That would be the VRO pump then.

[basscat21]

So I did not trust the fuel pressure gauge since the gauge was intended for higher pressure. I took clear 3/8, attached it to the port fuel rail with premix, tied to the rafter, took another clear 3/8s and attached to the VST nipple and hung that end to rafter, pumped ball to the point that fuel was 6 inches up the clear line. Started motor and the fuel moved up the clear line in pulses.

I think the VRO is working.

Took it out, start Idle and took off, fished for an hour, caught 1 -7 inch Smallie.

Started idle, put in gear dies. Push primer, stumbles but gets going.

Guess I need to go back and recheck my rebuild of carbs?

[DLinzy]

Yes, follow the service manual to a TEE and use OEM gaskets, floats and run a wire thru the jets to ensure they're clear. Also larger jet goes on bottom, 39 in my case 24 up top.

[suzukidave]

when you say bulb goes hard after 1-2 pumps are you talking when not running or running? how long does it stay hard after you pump it up when not running?

to recap

even compression

runs fine when cold

idles fine but stalls out under load when warm.

when it stalls, giving it fuel perks it up.

sounds like too much air.

[basscat21]

when you say bulb goes hard after 1-2 pumps are you talking when not running or running? how long does it stay hard after you pump it up when not running?

to recap

even compression

runs fine when cold

idles fine but stalls out under load when warm.

when it stalls, giving it fuel perks it up.

sounds like too much air.

Pumped ball at home drove to lake 3 miles, grabbed bulb about 1/4 squeeze hard. Started right up, i have new hoses coming, VST to fuel rails. They are 24yrs old.

Jets how can you tell size?

[ChampioNman]

Pumped ball at home drove to lake 3 miles, grabbed bulb about 1/4 squeeze hard. Started right up, i have new hoses coming, VST to fuel rails. They are 24yrs old.

Jets how can you tell size?

You'll have to remove one of the carb drain plugs and remove on of them the number is stamped on the side. The mid size will be stamped on the end.

[suzukidave]

Pumped ball at home drove to lake 3 miles, grabbed bulb about 1/4 squeeze hard. Started right up, i have new hoses coming, VST to fuel rails. They are 24yrs old.

Jets how can you tell size?

you have to look at them with good eyes or a magnifying glass. they are marked. you can tell relative size more easily by looking through the orifices and comparing.

i am sorry to be not much help here.

my suggestion for now would be to eliminate the problem being localized to one cylinder. get it good and warm in the lake to where it is stalling on you and then start removing plug leads one at a time and run it on 5 cylinders one at a time and see if you see any difference in engine idle. you are looking for one cylinder that makes no difference when unplugged. put it in gear on 5 cylinders to find out if runs different. if you find a down cylinder, try moving the plug and coil to another cylinder and see if the problem moves. if it doesn't move, go back to your rebuild on that carb.

if the response is uniform on all cylinders then you know the issue is somewhere upstream of the carbs and coils in your common denominators (fuel supply/powerpack/stator)

[basscat21]

I think I found the issue, the middle bowl gasket seems to too thick, it prevents a good seat of the perimeter gasket.
These are new bowls and rebuild kits from BRP. When I look at the bowl with the middle gasket installed, then put bowl on its evident that the gap is too great.


img host



Center gasket in



No Gaskets

[suzukidave]

not seeing the images. just a dead link.

[basscat21]

not seeing the images. just a dead link.

The gap of the bowl is greater than the gasket due to the center gasket.