dual 38s on 61x motor
- Thread starter JetManiac
- Start date
Quinc
Buy a Superjet
- Location
- California
I would start with stock sj jets and pop off. Or if it has a protec pipe call Carl.
- Location
- Eugene, Oregon
Jets worked out good guys thanks! Held off on changing the pop off springs until I get a tester but throttle was crisp with the springs in it.
- Location
- Eugene, Oregon
Well spoke too soon. Anyone have any advice/ideas as to why the front cylinder won't fatten up?
Blaster with 61x dual 38's each has their own fuel pump and direct line to fuel tank. I'm thinking there is an air leak some place causing the front cylinder to go lean.
I have replaced about every gasket ( base, new head ada girdled, intake gaskets) I also rebuilt the carbs. The high speed on the front seems like it's not working. The back looks good plug is brown. I can run the high on the front carb all the way out with no change. Ski rips low and half throttle but once i go full it runs hard for about 1 min then dies. Like it ran out of fuel, starts back up without issue. Replaced all fuel filters, new lines.
Highs 145
Lows 72.5
Pop off 32
Factory pipe, msd enhancer, blowsion filters with outerwears .
Blaster with 61x dual 38's each has their own fuel pump and direct line to fuel tank. I'm thinking there is an air leak some place causing the front cylinder to go lean.
I have replaced about every gasket ( base, new head ada girdled, intake gaskets) I also rebuilt the carbs. The high speed on the front seems like it's not working. The back looks good plug is brown. I can run the high on the front carb all the way out with no change. Ski rips low and half throttle but once i go full it runs hard for about 1 min then dies. Like it ran out of fuel, starts back up without issue. Replaced all fuel filters, new lines.
Highs 145
Lows 72.5
Pop off 32
Factory pipe, msd enhancer, blowsion filters with outerwears .
- Location
- Coeur D' Alene, ID
Two things to check
1. Do you have a primer? Is it only going to problem carb? Is it hooked up in reverse? This will cause it to suck air into your fuel line leaning out that cylinder...don't ask me how i know this...
2. Is your gas tank breather tube breathing? My buddies got pinched between gas tank and the hull and caused the lean/shutdown issue you are experiencing, would run ok mid and low, but once he opened it up it would create a vacuum in the tank and carb wasn't able to pull anymore fuel. Once it died and he stopped the tank would equalize and he would be off to the races again for a short time.
1. Do you have a primer? Is it only going to problem carb? Is it hooked up in reverse? This will cause it to suck air into your fuel line leaning out that cylinder...don't ask me how i know this...
2. Is your gas tank breather tube breathing? My buddies got pinched between gas tank and the hull and caused the lean/shutdown issue you are experiencing, would run ok mid and low, but once he opened it up it would create a vacuum in the tank and carb wasn't able to pull anymore fuel. Once it died and he stopped the tank would equalize and he would be off to the races again for a short time.
- Location
- Eugene, Oregon
Primer line is t'd to both carbs but plugged/capped with a screw in the line being closest to front carb. I'll see about moving that around or just complete the lines so it works.
Fuel lines are hooked up to ins and both returns are t'd to single return to tank. Doubled check those to make sure.
The tank vent I believe it's ok. I can blow through one way and it's installed with arrow pointing to fuel tank.
Fuel lines are hooked up to ins and both returns are t'd to single return to tank. Doubled check those to make sure.
The tank vent I believe it's ok. I can blow through one way and it's installed with arrow pointing to fuel tank.
Big Kahuna
Administrator
- Location
- Tuscaloosa, AL
You may have some gunk in high speed circuits. Spray some carb cleaner thru the high speed adjuster hole.
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Sent from my SAMSUNG-SM-G930A using Tapatalk
- Location
- Eugene, Oregon
No restricter in the return line. Should I stuff a 120 jet in the return line or how do you judge the size to use? Both returns from the carbs are T'd to a single line them attached to top of tank.
- Location
- Eugene, Oregon
Changed out the leaky tygon fuel lines with some good stuff from jetmaniac along with the black Y from above and a 60 jet seemed to do the trick! Little blaster runs good now. Thanks for all the help. I need to pick up some carbon tech reeds before it eats the metal stockers.
Happy ending!
