New Engine ran well and now is un-driveable

[jst854]

I did one. Held 6 lbs for 6 mins.

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[caleb90]

1 hour ago, jst854 said:

I did one. Held 6 lbs for 6 mins.

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Did it start to loose pressure? My motor lost 1lb when sitting over night. 

[jst854]

No I only left it on for 10 mins or so though. Insurrections that came with my tester said 1 lb loss a minute is acceptable

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[jst854]

Fairly confident it has to do with the needles properly closing off the fuel supply. I turn the gas off and it runs perfect until the bowls go dry. Just had the floats set at 19mm will verify tomorrow that the needles are holding pressure when closed and go from there

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[Jereme6655]

1lb loss per minute is acceptable. Obviously try for less, but perfectly fine with that loss. 

[375hp banshees]

2 hours ago, jst854 said:

Fairly confident it has to do with the needles properly closing off the fuel supply. I turn the gas off and it runs perfect until the bowls go dry. Just had the floats set at 19mm will verify tomorrow that the needles are holding pressure when closed and go from there

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What do you have for fuel tank vent?

[jst854]

Just the stock cap for th fuel tank. Float needles will not hold any pressure. Bowl off carb upside down I put the guage from my leak down tester on the inlet. Will very verify hold until 3 lbs or so and then fall off quickly. Sprayed some wd40 and it is leaking from the needle. These carbs are brand new, 3 hours on them. Is the needle supposed to have something it seats into, or just the housing of the carb? Anything I can do to fix it besides getting new needles even though the are practically new

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[375hp banshees]

The fuel will put up pressure on the needle (via float), to keep it seated....kinda hard to duplicate that

[375hp banshees]

If it were old carb's or knock off's i'd say dig deeper but, prob. Not the issue.

Typically the fuel inlet needles, "seat" o.d. is  fitted into the carb body, via an oring. which gets over looked during an old carb rebuild & the needle seats on the i.d. of that.

[jst854]

Idk I think it is that. The one carb will hold 5 psi the other will not. Switch the float and needle and the problem stays with the same carb

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[jst854]

It would explain being so rich despite jetting leaner, just not sure how to fix it as it seems it is part of the carb itself

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[375hp banshees]

Is your over flow flowing? Maybe try & set hight, to seat off  flow sooner in that carb, for now & see?...i assume youre only having issues with 1 cyl. & you swapped carbs?

[jst854]

Correct only issue with one side, follows the carb. I tried setting them out of wack to shut off fuel sooner, didn't make a difference. I don't think the needle seat is a replaceable part in these carbs. Will see if I can clean it up a bit and see if that helps

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[jst854]

The over flow is not overflowing, which makes my theory make less sense but it's the best one I got now.

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[kawa110]

Knock off China jets?


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