Hard starting Yamato 102

[ZUL8TR]

tune tweek tips

Man, ... this is great info guys, ... Whoo-Hoo!

I just ordered 4 NGK B10EGV plugs, ... they'll be in tomorrow.

I want to buy a fuel pump setup, .. but for the last 2 days, ... BTM hasn't answered their phone, ... are they still around? Who else carries the fuel pump kits?

As far as tweaking, ... I meant, ... dialing it in, getting it running in tip-top shape. The little tricks you guys have.

I am looking for web sites were people document their tear downs, rebuilds of the engine and it's various parts, like cleaning, rebuilding carbs, points, fluids and such. But so far, ... my searches have came up with nothing. Maybe it was meant to be that way considering it's racing, and racing is very secretive.

So far, in the one time I have taken the boat out since I built it, ... I AM HAVING A BLAST even with the hard starting.

Heck, ... I might have to look into building a racing rig and try my hand at racing again. It's been many, many years, ... but I used to race speedway Motorcycles 20 years ago and quite after a pretty harry accident.

Thanks Guy's, ... REALLY!

Bill

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Look into Ric Montoya's site for some tips

http://yamatoracing.com/yamato302.php

Look under the Services tab then Technical Blog, there you will find how to set the ignition as well as other stuff. For the ignition to set it accurately you need a buzz box and a dial indicator that's how I do it. For accurate setting we lock the mag at full advance. For lake running you may want to leave it unlocked but that tends to not keep the accurate advance setting described on Montoya's Blog. Ric might have a buzz box and dial indicator for sale just ask him. Also see the owners manuals if you don't have one.

[stevegray]

Wild Bill is Right! Open that throttle UP, you'll still have plenty time to keep it from getting away from you, if that is what you are worried about

[BillCNC]

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Look into Ric Montoya's site for some tips

http://yamatoracing.com/yamato302.php

Look under the Services tab then Technical Blog, there you will find how to set the ignition as well as other stuff. For the ignition to set it accurately you need a buzz box and a dial indicator that's how I do it. For accurate setting we lock the mag at full advance. For lake running you may want to leave it unlocked but that tends to not keep the accurate advance setting described on Montoya's Blog. Ric might have a buzz box and dial indicator for sale just ask him. Also see the owners manuals if you don't have one.

ZUL8TR,

Got it, ... thanks!

[BillCNC]

Wild Bill is Right! Open that throttle UP, you'll still have plenty time to keep it from getting away from you, if that is what you are worried about

No, I'm not worried of it getting away from me, ... I just dont need a ticket.

The lake has a 35 MPH speed limit. So far, every person working on the lake thought my boat was cool, so they said they would turn their head in regards to the speed limit as long as I don't act like I own the lake. The boats so small, ... they can always tell people that complain, ... it's an optical illusion because of it's size.

I really don't want to push my luck, if you know what I mean. Use it, ... but don't abuse it.

[Top Gun 3-Z]

Starting problem

Not trying to deter you but the one thing about the Yamato is the carb set up is simple installing a fuel pump is more stuff to have to deal with when motor is giving you problems starting my opinion getting fuel to the spark plugs is very difficult when the prop is in the water try taking the carb cover off and covering the carb with your hand and pull start the motor kinda a manual choke that gets the fuel to the cylinders it works ! The fuel has to travel from carb to cylinder past crank kinda hard with lotta back pressure all yea two wraps around fly wheel with pull cord is plenty . Good luck Top Gun 3-Z

[BillCNC]

Since I am putting new plugs in it tomorrow I removed the plugs. They have soot on the ends of the threads. The bottom one had soot on one side more than the other side, ... strange. The top plug had soot on the threads just like the bottom one, ... but it was all around the plug.

The soot on the threads puzzles me especially since I have 18-14mm adapters.

Thoughts?

ADD: ... BTW, ... These plugs have 1.5 tanks of gas useage.

[rball82]

Not trying to deter you but the one thing about the Yamato is the carb set up is simple installing a fuel pump is more stuff to have to deal with when motor is giving you problems starting my opinion getting fuel to the spark plugs is very difficult when the prop is in the water try taking the carb cover off and covering the carb with your hand and pull start the motor kinda a manual choke that gets the fuel to the cylinders it works ! The fuel has to travel from carb to cylinder past crank kinda hard with lotta back pressure all yea two wraps around fly wheel with pull cord is plenty . Good luck Top Gun 3-Z

Be nice to see 3Z back at a race next year, miss you guys!

[S Henderson]

Since I am putting new plugs in it tomorrow I removed the plugs. They have soot on the ends of the threads. The bottom one had soot on one side more than the other side, ... strange. The top plug had soot on the threads just like the bottom one, ... but it was all around the plug.

The soot on the threads puzzles me especially since I have 18-14mm adapters.

Thoughts?

ADD: ... BTW, ... These plugs have 1.5 tanks of gas useage.

Bill
Turn those plugs up so we can see the firing end please........

[BillCNC]

The firing ends are clean. Just the threads have soot on them.

If you need a picture, ... I'll have to take them tonight.

[raw]

Those Eix plugs are garbage throw them as far away as you can.If your ignition timing is off this will also make the motor hard to start.You need good clean ignition points gapped between 11 to 15 thou and set at around 235 before TDC and that should help a lot.Restrictor plugs and spark plug caps are not the way to go with a points type ignition.Do not worry about the soot on the end of the plug that is just there because the plug sticks in past the end of the adapter nothing to worry about.If the motor is tuned correctly the plug will have a coffe coloured ring at the bottom of the porcelain.

[bill boyes]

If your motor has Mag locks take them off and put the ones that the motors come with. Retard the ign mag when starting then advance to the stops when getting on plane. The motor runs real smooth retarded and starts very easily.
Japan does it for stadium racing.

[BillCNC]

Bill
Turn those plugs up so we can see the firing end please........

Here ya go, ... The plug on the left is the bottom cylinder.

[BillCNC]

I installed a new pair of B10EGV plugs and gaped them then at .025" I noticed that they are VERY loose when screwing them in all the way to the plug gasket before I tighten it a 1/2 turn with a plug wrench.

Could the soot on the threads be going between the plugs and the inserts because there is to big of a gap between the two? Maybe I have some cheap low quality inserts?

[BillCNC]

a fuel pump is more stuff to have to deal with when motor is giving you problems starting

Top Gun 3-Z

Top,

I need a bigger tank to insure I wont run out of fuel in the middle of the lake. I'm not racing this boat.

If your motor has Mag locks take them off and put the ones that the motors come with.
Japan does it for stadium racing.

bill

No locks, stock set-up.

Those Eix plugs are garbage throw them as far away as you can.If your ignition timing is off this will also make the motor hard to start.You need good clean ignition points gapped between 11 to 15 thou and set at around 235 before TDC and that should help a lot.

raw,

Got it, ... I have what appears to be new points or close to it. I will need to make a degree when and check the timing.

Thanks Guys
I really appreciate it.

[bill van steenwyk]

Bill:

I think what RAW was referring to when he said set your timing at 235 was 235 thousandth's before top dead center, NOT 235 degrees. You might want to clarify with Montoy'a's web site as I am not sure just what the timing is on your motor, BUT timing is usually referred to as thousandth's of an inch before top dead center, not degrees on outboard motors of the type you have.

It is different on the common Merc's, OMC's etc., and usually they have a mark on the flywheel in degrees BTDC, but not your engine.

You could use a degree wheel, by taking a reading of what degree's 235 thousandth's is before TDC, but just as simple to purchase an inexpensive dial indicator that reads out in thousandth's and then make a holder for the indicator that screws in the spark plug hole and then find TBC on the motor by rotating it until the dial indicator goes as far one way as it will go and then starts to go backwards from that point. That is TDC. Then back it up whatever number of thousandth's of an inch you want to set the timing at.

Save one of the spark plugs you were going to pitch, break all the porcelain out of it, cut the side electrode out of it and then insert the dial indicator thru it. You will need to drill and tap a couple of holes around the diameter of the piece you have left and use a couple small screws to lock it (the stem that contains the plunger on the indicator) into position so it doesn't shift while you have it in the plug hole. Very easy and cheap to make yourself, although if you do not have drills and taps, you can usually purchase one at any small engine repair shop.