96 challenger 787 carb needle/seat help

[lilngineer]

Can anyone tell me what the correct stock needle and seat size is for these carbs? 1.5mm or 2.0?

Also, which spring is correct for stock?

Lastly, does anyone know if I can use a MityVac to test pop-off?

 

[glenwhitt]

carb goods

Can anyone tell me what the correct stock needle and seat size is for these carbs? 1.5mm or 2.0?

Also, which spring is correct for stock?

Lastly, does anyone know if I can use a MityVac to test pop-off?

shop manual shows 1.5 needle, 70 low speed jet at 1 turn out, 142.5 high speed at 0 turns out. In my altitude is use the silver springs that gives a low 30's PSI pop off. I was in the twenties and it was coming off low speed circuit way to quick.

 

[lilngineer]

Do you know what the correct stock spring weight is?

 

[glenwhitt]

in the part manual

I like to use the microfish from www.ridenow.com as it is fast and easy to zoom in and out. It breaks down both the mag and pto carbs. Will list all part numbers and decsription, inlcuding pop springs.

 

[lilngineer]

Not there

I looked up my boat (96 challenger), and the spring weight is not on the fiche.

I am trying to decide between the 65 gram (silver) and the 80 gram spring (black). The silver should put me in the middle of the pop-off range. The black will put me on the upper end.

 

[glenwhitt]

I looked up my boat (96 challenger), and the spring weight is not on the fiche.

I am trying to decide between the 65 gram (silver) and the 80 gram spring (black). The silver should put me in the middle of the pop-off range. The black will put me on the upper end.

With the silver I am in the bottom half (barely) of he recomened psi and no complaints. I am not sure if being at the top end would cause it to be a little lean before crossing over or not. Let me know what you decide, what the psi is when finished, and what you think of it.

 

[timmyboy76]

oem vs. "color"

whats crazy, is that, when get'n my first boat to pop right, (threw the stock ones out..:ack, called around, gave them the "oem" number, they had spring in stock, went over, and sure enuf, it was the "black" spring...wtf.
Ended up, chas'n down some stockers, and fixed prob...

Theres 2 "silver" springs...the one, with the "OPPISITE" coil wind, is the 95gm spring..:cheers:

 

[lilngineer]

I ended up going with OEM also (kind of).

My boat is a 96, but the dealer was out of stock. We checked the 97 and it's a different part number. What gives. Since they had them, I bought and installed them.

They look like a really like a light golden-silver color. Ironically the n/s is the same part number for both years.