I am STUMPED! please HELP!

[RogersJetboat454]

Re: I am STUMPED! please HELP!

Okay I will be taking a look here in a minute. Thank you

Hope I'm not too late...

May I also suggest taking a good look at the tip of the needle while it's out. Any kind of bending, file marks, or a very blunt end is an indication that either someone has seated the needle too hard, or someone has tried a tool shed repair to fix a bad needle. The angle of both the needle and the orifice (#35) is a critical relationship that needs to be just right to get the correct fuel mixture. If the needle is blunt, bent, or broken, and or the jet (#35) is out of round, it will richen up your mixture by allowing excess fuel to be metered by.

 

[kfa4303]

Re: I am STUMPED! please HELP!

I would also run 50:1 mix with Champion J6C, rather than the J4C too.

 

[chiefcatchemall]

Re: I am STUMPED! please HELP!

Needle looked great guys. I looked at it good and hard. Wish I could get more than an hour of free time after work or I am sure I would have gotten farther with this..

 

[scuba_redneck]

Re: I am STUMPED! please HELP!

When you are inserting part #35, it will take a bit of force to get it to go into the passageway. It is designed like this. If there is any air leakage around the needle it will run like garbage. Part #41 is crucial also to sealing off the air leak. #35 is the part I was talking about in post #26 of this thread. Make sure you get #35 all the way into the back of the passage but do NOT overtighten it!! Just a good snug fit is all that is required. You will more thank likely need to put the plastic arm minus the metal linkage onto the needle in order to get it to thread down the passageway. Holler at us if you get stuck. It should idle much better once those parts are in and the needle is tuned.

 

[chiefcatchemall]

Re: I am STUMPED! please HELP!

Well out the needle bearing in the passage after I cleaned the pistons again. It would fire but it wouldnt stay running. Only for about 3 to 5 seconds at a time. I am convinced it is a fuel problem. I believe I am getting to much fuel...I noticed some gas that looked like it was leaking out from the float bowl gasket. I took the carb apart, made sure the needle valve was set right and took a good luck in there...it all looked good...It seems like something has got to be missing or something for me to be getting too much fuel...I am kind of lost. Not that this matters, but I took a cold compression reading and both cyls were right on 80 cold. Couldnt keep the motor running long enough to heat up. Got compression, I replaced the ENTIRE electrical system, so its got to be something going on with me getting too much fuel:facepalm:

 

[nwcove]

Re: I am STUMPED! please HELP!

are you 100% sure that the carb has all the parts in all the right places? if so, are you sure that the fuel pump rebuild went ok? a torn diapragm can cause symptoms like you're describing. ( or an unexpected child. lol)

 

[chiefcatchemall]

Re: I am STUMPED! please HELP!

Haha!! I believe everything is in tact...I am pretty sure the fuel pump rebuild went good..I could blow through the one end and hear a bogging sound like you are supposed to, and when I blow through he other end nothing happens...

 

[glenn property of pam]

Re: I am STUMPED! please HELP!

dont know if its the right way but ive always used a piece of pipe and blown in the carbs when they are apart and moved the float gently with my finger to ensure the needle seats like it should as only a tiny piece of dirt can cause the carb to leak.

 

[AlTn]

Re: I am STUMPED! please HELP!

chief...I dunno...seems to me you might be barking up the wrong tree...looking at the diagram for your ignition < and seeing what is no longer available >..there are many connections, grommets protecting wires through the armature plate and ground wires as well as wiring between the points and a ground wire strap underneath the armature plate , to the extent that losing continuity somewhere in that system as it ages seems inevitable.
Do you have access to an inductive timing light so you can observe the flash while the engine is running? In Post # 15 it seems you had it running sorta ok? Can you still get it to do this?
Scanman had a similar problem with his 9.9 and took his ignition down to the bare armature plate. He then cleaned every ground point with the brushes from a gun cleaning kit, reassembled it all, and was then good to go.

 

[willocreek1202]

Re: I am STUMPED! please HELP!

It still sounds to me that your way rich on the fuel. Do your own compression check. You shouldn't have to be pulling the head off once you did the initial inspection. Never trust compression checks to the seller. It really does not sound like you need pistons and rings.
Do a compression check and report the numbers and go from there. If compression is good, you still need to look at the carbs, mainly the needle valve and seat.

 

[chiefcatchemall]

Re: I am STUMPED! please HELP!

Yeah well I can keep it running long enough to get it to temp top take an accurate compression reading. I did however do a cold compression check, and it hit 80 on the button for both. I am definitely convinced I am getting TOO much fuel. I see gas leaking out of the carb around the bottom of the float bowl. I took it apart yesterday and looked and all seemed to be good. The needle was set right and didnt seem to be sticking at all. The float was sitting parallel to the bottom of the float bowl...Also if I let it sit after trying to get it going for a few minutes and go back out it will want to fire the first time but then die shortly after. Again I believe its flooding it...

 

[willocreek1202]

Re: I am STUMPED! please HELP!

It still sounds to me that your way rich on the fuel. Do your own compression check. You shouldn't have to be pulling the head off once you did the initial inspection. Never trust compression checks to the seller. It really does not sound like you need pistons and rings.
Do a compression check and report the numbers and go from there. If compression is good, you still need to look at the carbs, mainly the needle valve and seat.

 

[BonairII]

Re: I am STUMPED! please HELP!

Have you checked compression yourself or were those numbers(108 & 110psi) based on what the PO "said" they were?

 

[chiefcatchemall]

Re: I am STUMPED! please HELP!

thats what he said it was. As I said I checked it myself yesterday. Couldnt get it warm to take an accurate reading...they were both 80 when the engine was cold.

 

[Chinewalker]

Re: I am STUMPED! please HELP!

Did I read correctly that only the TOP cylinder is running black? If so, I might check the fuel pump - assuming it is bolted to the top transfer port cover. You might have a leak in the diaphragm, allowing fuel to go directly into the top cylinder. Hole may be small enough that the pump still pumps to the carb, giving the false impression that it is pumping correctly...

 

[AlTn]

Re: I am STUMPED! please HELP!

I think the fuel pump pulse comes from the bottom cylinder on these, Chine.
Chief, what's your link'n sync procedure when you set the carb linkage roller and timing cam ?

 

[chiefcatchemall]

Re: I am STUMPED! please HELP!

I will have to check that out Chinewalker. The top one was worse than the bottom but the bottom cyl wasnt far behind it...I just took off the carb again. Looked at it next to a diagram. Everything seems to be there...I reseated the needle, and adjusted the float to where it needs to be. Same problem...just doesnt make any sense to me...Just am getting so lost...

 

[AlTn]

Re: I am STUMPED! please HELP!

chief, take a popsicle break and think a minute. You're operating under the assumption that this is the right carb on this engine. Looks like the diagrams no doubt, but so do several hp. carbs from that time. The orfice plug <jet> has a specific diameter size as it acts as a fuel metering device for the carb. It has a size stamped on it...do you recall the number? On an engine this age, it's highly doubtful you're the first one into this carb and it's tempting to clean that jet by poking something through it. If the "cleaning rod" was larger and harder than brass, it's not that difficult to increase the jet's diameter. If you used a Sierra kit...it's been noted here that some had needle seat gaskets that were too thick so the float level adjustment would have to compensate for this. Poor quality spark and retarded timing can produce black plugs as well as too much fuel. Have you noticed fuel dripping from the carb throat?

 

[nwcove]

Re: I am STUMPED! please HELP!

its also quite easy to bypass the fuel pump and gravity feed the carb. ( just to rule out a problem at the pump)

 

[chiefcatchemall]

Re: I am STUMPED! please HELP!

Just taking a few days to get away from it. I was getting awfully frustrated...Have thought about it a bit, still not making much sense to me though. Had a great day fishing with a buddy.