What size jets ?
 

My '40 runs really rich as I have black soot coming out the tail pipe at start and I get poor gas mileage.

What size jets are recommended for 85hp - '40 and is there something else I can do to lean it out ?

Thx....Mike

Re: What size jets ?
 

Could be just a bad Power valve.

Re: What size jets ?
 

That would be the first thing I would check.

Sal

Re: What size jets ?
 

Should be around 51 main jets.

Re: What size jets ?
 

51 jets, but I think you'll find the power valve is carput. Walt

Re: What size jets ?
 

Should I buy a new Power Valve or just clean it. If so...where to buy ?

Thx....Mike

Re: What size jets ?
 

Check with CharlieNY on this site. Has machined PV's that's seat properly.

Re: What size jets ?
 

Thx Chap....

Re: What size jets ?
 

Type this into google:

running rich site:www.fordbarn.com

Lots of posts here for 94s running rich. I have typed out the long list of things that can cause it many many times. Once only recently.

This was it:

https://www.fordbarn.com/forum/showthread.php?t=197943

Lots of things to check before changing jets.

Mart.

Re: What size jets ?
 

Thx Mart

Re: What size jets ?
 

Yeah, you are at or close to sea level, so #51 jets should be just right for you altitude. Must be something else causing rich condition.

Re: What size jets ?
 

You might try a company called Renners Corner. They only advertise '28 to '34 but they might be able to help. All the jet's that I had purchased before Renners were JUNK. If you check them with a pin gauge they weren't even close. Renners flow tests every jet and gives you a paper showing the results. You can't ask for better service.

Re: What size jets ?
 

Thx woodie I'll give them a try along with new power valve.

Mike