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Hard starting custom 10


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#1 junkyardjeff OFFLINE  

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Posted November 20, 2016 - 06:04 PM

I have a early 70s custom 10 that when trying to start cold with the throttle above idle it acts like the timing is too advanced,motor spins over just fine at idle and been putting up with this since I got it so time to fix.



#2 MH81 OFFLINE  

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Posted November 20, 2016 - 06:33 PM

Starter Gen or bendix starter?

#3 junkyardjeff OFFLINE  

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Posted November 20, 2016 - 07:00 PM

Bendix starter.



#4 Tecumseh power OFFLINE  

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Posted November 20, 2016 - 08:27 PM

Check the air gap on the solid state there is two trigger pins on the flywheel. The air gap is critical on those Tecumsehs. Because it affects the ignition timing That's why they have two it goes by the height. And rpm.
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#5 junkyardjeff OFFLINE  

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Posted November 20, 2016 - 09:32 PM

What is the gap supposed to be.



#6 MH81 OFFLINE  

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Posted November 20, 2016 - 10:39 PM

Have you tried a different starter?
I know it seems odd, but I've had good looking starters that won't quite crank it over fast enough. Change them and it starts like it should.
Also, make certain the battery is a good one. Low current or low voltage can make troubles.

Now, all that aside, i have always found the Teccys like to turn over best at idle, then slowly advance the throttle.
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#7 Tecumseh power OFFLINE  

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Posted November 20, 2016 - 10:58 PM

Put it at 9 thousandths
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#8 EricFromPa ONLINE  

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Posted November 21, 2016 - 06:29 AM

Sounds like Flywheel key is partly sheered.It affects starting quite a bit.

Doesn't have to be completely sheered off.It could have just a slight dent or line pressed into the key and it will make it crank hard especially when cold.

 

What Oil are you running in it? Don't use that cheap Wallmart Hi-Tec 30wt crap.It gets thick as tar when it's cold outside.

I had that junk in my snow blower last winter and it got so thick that the 120v starter wouldn't even crank it over.Had to bring it in the house and heat it up and change the oil before I could even start it.


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#9 TAHOE OFFLINE  

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Posted November 21, 2016 - 08:06 AM

What is the gap supposed to be.

 

.006-.010 on tall pin.

 

My Tecumseh always starts at advance ( approx 25*) and I have no problems spinning it or starting it at an idle.

 

Jeff, you asked this on the yahoo group too? I was going to respond there, but this site is much easier.


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#10 junkyardjeff OFFLINE  

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Posted November 21, 2016 - 08:20 AM

I do have another starter I can put on it and I have never had the motor apart but who knows what previous owners have done so I will pull the shroud and check the gap and inspect. I am using rural Kings 15 -40 diesel oil.



#11 MH81 OFFLINE  

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Posted November 24, 2016 - 07:20 AM

Is it the same at any temp or is it worse, the colder it gets?

#12 junkyardjeff OFFLINE  

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Posted November 29, 2016 - 01:10 AM

It is worse the colder the motor is.



#13 Alc ONLINE  

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Posted November 29, 2016 - 06:36 AM

Would it help to pull the plug wire off and crank it to see if it make any difference ?



#14 TAHOE OFFLINE  

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Posted November 29, 2016 - 09:32 AM

Would it help to pull the plug wire off and crank it to see if it make any difference ?

 

Do not do that Jeff, you can fry your SSI module if plug wire/plug Is not grounded when spinning it over.


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#15 junkyardjeff OFFLINE  

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Posted November 29, 2016 - 09:55 AM

I am going to put it in the garage in a couple weeks and take the shroud off and check the pins and flywheel key to see what I can find,I have never had it apart so who knows what a previous owner has done.






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