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Jet size to drill bit conversion/ motor rant #8828535 04/15/13 06:53 PM
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Bradshuflin aka hunter'sdad Offline OP
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Need to jet to 174 does anyone know how to figure this up in a bit size?

Last edited by Bradshuflin aka hunter'sdad; 04/16/13 03:53 PM.
Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8828568 04/15/13 07:03 PM
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Best I can figure its a .082 diameter and number 45 bit

Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8829737 04/16/13 12:05 AM
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Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8829972 04/16/13 01:09 AM
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Gary thanks i looked a that chart and many others that contradict each other all i know is the jet diameter is.082 and from chart to chart the bit size varies

Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8830294 04/16/13 02:24 AM
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why is every thing so far off on ur eng, seen several post????????


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Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8830583 04/16/13 03:39 AM
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Im staring to think the one that built it didn't really know what he was doing to honestly answer question but Im not naming any names it has been a constant headache since i had the powerhead done, after the third trip back with the same results i gave up on getting it done there. Im no boat mechanic and don't claim to be by anymeans but it is slowly getting better. I have hopes that it will be right after the jets and timing change. I have had those hopes though after everything i have changed since then. With nearly 5k in this motor you would think it would be perfect but sometimes that is just how things go.

Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8830780 04/16/13 05:39 AM
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I'm not claiming to be an outboard mechanic but on Holley Carb jets you could not go by drill size. They had a taper inside that caused some jets the same drill size to flow differently. I would just buy new jets instead of drilling old ones. I think you would be better served in the long run. JMHO

Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8830801 04/16/13 06:07 AM
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Well jets are 30-40 each x6 I want to make sure the timing and jets make a difference before dropping more money into it. I agree that buying the correct jets is better in the long run if that actually fixes my issue. I also went and bought 2 of the factory fuel pumps today too the electric wasn't working out tested it at 3.8psi and I need 6. So with the added timing it wasn't going to workout with low fuel pressure. Ray neudecker that I have been in contact with now is the one that did all the machine work to this motor and I'm told is the 2.6l guru on yamaha's. I have more faith in his opinion than most others and he told me the timing was probably set wrong I checked it today and it was, he also said the jets needed to be bumped to 174 to work with the correct timing. If this doesn't cure the problem i have no other alternatives but to take it somewhere. I'm not tearing into the motor and that's about the only other thing that could be changed. I will find out tomorrow if I get to put it on the lake I guess.

Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8830827 04/16/13 07:03 AM
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By upping the fuel pressure you could increase fuel flow also. It depends on the setup. Also does it have any idle circuits or high speed air bleeds that could be an issue. Like I said I am not an outboard mechanic but I do know a little about auto carbs. By retarding the timing , if that is what you had to do to get it right, could also richen it up a tad. I would just try and see what it does with all the stuff you have done to it and see what it does. If it is only 1 or 2 jet sizes off it should not affect the way it runs at partial throttle. On some carbs you can cover the air bleeds or idle circuits up and affect fuel flow also. Check and make sure all gaskets are installed corectly. Just trying to think of anything that might help.

Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8830828 04/16/13 07:10 AM
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Does this motor have any sensors on it for Baro, TPS, or O2? When they were installed what sealer did they use. I have seen different sealer affect sensors in some of the strangest ways you can imagine.

Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8831930 04/16/13 03:52 PM
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This is the stuff that is getting me so mad about my motor.
Started pulling jets 5 of 6 are missing gaskets, 2 of them are missing washers.
And pulled the brand new fuel pumps out and one is busted in piece just my luck they won't have another one till Friday. Thinking I may just tear it apart and put the few diaphragms in my old housing though.

Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8832114 04/16/13 04:35 PM
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I have had those o rings come apart and stop up the jet before.

Re: Jet size to drill bit conversion??? [Re: Bradshuflin aka hunter'sdad] #8832204 04/16/13 04:52 PM
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I don't know why someone put that black oring on one jet. It doesn't belong there. That jet probably was not going all the way in with that oring on there. The aluminum washers are the gaskets. The jets without a seal probably went in to far. I believe I would think real hard about pulling those carburetors apart and giving them a thorough cleaning and put a kit in each one.

Last edited by Todd B; 04/16/13 04:59 PM.
Re: Jet size to drill bit conversion/ motor rant [Re: Bradshuflin aka hunter'sdad] #8832528 04/16/13 05:59 PM
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Todd think your right again, the timing advance was also not set right or tightened so just one thing after another

bang

Re: Jet size to drill bit conversion/ motor rant [Re: Bradshuflin aka hunter'sdad] #8832583 04/16/13 06:14 PM
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Looks like you need to start from square one on this motor. I dont know who you had rebuild this engine but I would think long and hard about taking anything back to them.

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