Plug Wires 102

[bill boyes]

I am willing to help anyone, No need for you to suffer from my mistakes. Some think that I am full of BS. HA HA

[mark5pa]

OK, if you guys are so smart (which I think you are), what is the height of the main fuel needle jet, on a Yamato 102, to get in the pall park. My mentor set it in the beginning of the season, and I have just been going up/down clicks, depending on temps, and class, CSH/20. Of course, I forgot to measure when I tore the carb apart to clean. Duh.

Thanks
Mark 55P
Rookie

[thepiranhabros]

OK, if you guys are so smart (which I think you are), what is the height of the main fuel needle jet, on a Yamato 102, to get in the pall park. My mentor set it in the beginning of the season, and I have just been going up/down clicks, depending on temps, and class, CSH/20. Of course, I forgot to measure when I tore the carb apart to clean. Duh.

Thanks
Mark 55P
Rookie

34 clicks for my 102. If I were you, I'd start at around 30 and play with the setting, keeping track all the way.

[mark5pa]

I'm stumped. 34 clicks from where? When it is totally unthreaded? The only reference I have seen, is both brass nuts out, tight together, and see how far the tip of the needle is above the hole in the top nut.

[thepiranhabros]

Bottom it out (screw it clockwise all the way in). Then 34 clicks out (anti-clockwise). In is leaning it. Out richens the mixture.

[bill boyes]

You know i have found that no 2 motor carb settings are alike. Al lot of it because of the high speed needle.
Hint.1. do not close the needle too hard on the jet. if you do you may scar the needle with a ring.
hint 2. use 2 'O' rings for packing nut
hint 3. with needle nose pliers move the spring away from the needle so as not to put pressure the needle. I have seen needles that look like corks screws because of it. DO not remove the needle spring as is needs to be there.
Hint 4. All the 302's and 102's that i have owned run about 42-44 clicks. I am not saying that 34 clicks is wrong I am just saying where my motors ran best.

[mark5pa]

You know i have found that no 2 motor carb settings are alike. Al lot of it because of the high speed needle.
Hint.1. do not close the needle too hard on the jet. if you do you may scar the needle with a ring.
hint 2. use 2 'O' rings for packing nut
hint 3. with needle nose pliers move the spring away from the needle so as not to put pressure the needle. I have seen needles that look like corks screws because of it. DO not remove the needle spring as is needs to be there.
Hint 4. All the 302's and 102's that i have owned run about 42-44 clicks. I am not saying that 34 clicks is wrong I am just saying where my motors ran best.

From full in, that makes sense now. Familiar with lipping needles from motorcycles. My index pointer is gone, may get one (bent away) just for easy reference. File mark on the nut is iffy. My mentor is getting me another o ring. I just put new rings in, so I may start out a bit rich, more toward 40 out. Bit more pre mix oil too. Been running 40/1, may do a few tanks at 30/1.

[bill boyes]

The spring has to be installed, inspection item so do not remove just bend it away from the needle.
Oil mixture. I run 20 to 1. I do not want to start another argument.

[Aussie Steve]

My 102 was always 42 to45

[thepiranhabros]

You're all correct. There is no hard-and-fast rule.

However, Mark was starting with no point of reference and asked to "get in the ballpark." Every engine is going to run differently and require different jet settings, which is why I recommended he start at 30, make some test runs, adjust the settings, and keep track from there to find what works for him.

Oil mix in the gas will play a role too. I run 12-oz. of oil per gallon of gas.

[mark5pa]

The spring has to be installed, inspection item so do not remove just bend it away from the needle.
Oil mixture. I run 20 to 1. I do not want to start another argument.

OK, info overload. I copied the tech manuals, and after the 1000th reread this season, can't find anything about the indexer arm, unless it's one of those "must remain stock" items. Looked at a bunch of 102's/302's in the pits, never seen one. But sure I'm wrong here. Gonna get one anyway, for reference marks. (fat chance I will finish up enough to get teched that close. although I did get a 3rd at Sharptown).

Just got the motor buttoned up, 40 clicks out on needle, just to be safe (rich).
And, yes, I have seen all the threads on fuel/oil mix. Don't want to go there. I race 40/1, will do 30/1 or better for the break in.

Speaking of rings, what kind of time do you all think is good to break them in (the soft rings)? I was thinking 15 to 20 miles, I live on a lake where I can test. Do dry starts hurt/help?

Thanks
Mark 55P
Rookie

[thepiranhabros]

OK, info overload. I copied the tech manuals, and after the 1000th reread this season, can't find anything about the indexer arm, unless it's one of those "must remain stock" items. Looked at a bunch of 102's/302's in the pits, never seen one. But sure I'm wrong here. Gonna get one anyway, for reference marks. (fat chance I will finish up enough to get teched that close. although I did get a 3rd at Sharptown).

Just got the motor buttoned up, 40 clicks out on needle, just to be safe (rich).
And, yes, I have seen all the threads on fuel/oil mix. Don't want to go there. I race 40/1, will do 30/1 or better for the break in.

Speaking of rings, what kind of time do you all think is good to break them in (the soft rings)? I was thinking 15 to 20 miles, I live on a lake where I can test. Do dry starts hurt/help?

Thanks
Mark 55P
Rookie

Going out on a limb here; I test wheel my freshened up Yamato for 10 to 15 minutes at varying speed and consider it "broken in."

I'm sure others will offer different methods. This works for me and is what I do.

[troy davis]

102

Bottom it out (screw it clockwise all the way in). Then 34 clicks out (anti-clockwise). In is leaning it. Out richens the mixture.

hi, mark
40 turns is a good starting point. my 102 is 41 out with 6oz. oil per gallon .my motor runs good in ca. plugs look great 34 out i think is to lean will heart your motor. troy

[mark5pa]

You guys are great! Thanks for all the input. I road raced motorcycles for 12 years, never had this kind of help.
See you on the water.

M

[bill boyes]

I have been told by top motor people that a tank of fuel is about right for rings.
I run 16oz to 2 &1/2 gals red line. Break in with Merc oil.