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timing advance

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#1 delray OFFLINE  

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Posted December 30, 2017 - 11:11 AM

hey guys, do any of you have a tecumseh handbook that shows how much much timing advance a factory points hs-40 has. i know i have seen it before in a book and i believe it was some where around 30+ degrees they run at.

not looking to set the timing or anything. just would like have some verification on this. picture maybe too would be great.

thanks .....

 



#2 boyscout862 ONLINE  

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Posted December 30, 2017 - 12:01 PM

In our Manuals Section you can find the manuals that you want and can download 3 for free per day. It is a great resource that we have for members. Several of our sponsors are good at finding Tecumseh parts if you need them. Good Luck, Rick

Try this one: http://gardentractor...service-manual/

Edited by boyscout862, December 30, 2017 - 12:04 PM.


#3 dodge trucker ONLINE  

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Posted December 30, 2017 - 01:03 PM

They show a spec of so many thousandths before TDC where the points just break. (Start to open) measuring with a dial indicator thru the spark plug hole there's a special tool they sell for this.

#4 delray OFFLINE  

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Posted December 30, 2017 - 03:23 PM

dodge trucker, thats not what i was asking,but i do appreciate your help.

thanks boyscout862 , i will check it out and see if i can find it?

any other input would be great.

thanks.....



#5 delray OFFLINE  

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Posted December 30, 2017 - 03:44 PM

i just check it out and unfortunately it took me to 8 to 18hp motors. no luck!

manual has to be from 70's or early 80's for the hs-40 small block with points.

if someone has this book it will show how much advance timing they ran.

not having any luck on the internet with this manaul. it's all newer stuff?



#6 29 Chev ONLINE  

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Posted December 30, 2017 - 04:02 PM

i just check it out and unfortunately it took me to 8 to 18hp motors. no luck!

manual has to be from 70's or early 80's for the hs-40 small block with points.

if someone has this book it will show how much advance timing they ran.

not having any luck on the internet with this manaul. it's all newer stuff?

 

​This books covers the HS-40 points but may be too new - http://gardentractor...-manual-692509/



#7 Bolens 1000 ONLINE  

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Posted December 30, 2017 - 04:05 PM

Heres a video make by an authorized Tecumseh rep in the 80's which shows you how to do it

 

 

I also stock the 2008 hard copy of the L head manual those run $9.95 and do cover a bit of the prcedure


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#8 delray OFFLINE  

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Posted December 30, 2017 - 06:56 PM

thanks 29 chev,but to new too.

sorry bolens 1000 not looking to set the points and initial timing.

just trying to get some verification that the older hs-40's ran a total 30+ degrees advance.

i know i have seen this in the pass in a older tecumseh book,but unfortunately i don't have any books on me.

just the newer ones and they don't really help me.

this is for a performance up grade i would like to do,if you guys are wondering by now?

still thanks for your input and quick replys.



#9 drbish ONLINE  

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Posted December 30, 2017 - 09:05 PM

Here you go

tecspec.jpg  tecspec1.jpg

 

 


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#10 delray OFFLINE  

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Posted December 30, 2017 - 11:14 PM

thanks drbish,your close. but does not show advance degrees of timing for hs-40 (when running)

just the settings for timing.

thanks .....


Edited by delray, December 30, 2017 - 11:15 PM.


#11 delray OFFLINE  

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Posted January 01, 2018 - 01:09 AM

i might just degree the flywheel and then hook up a timing light and go from there.

i know the newer stock motors(electronic ignition) run only 20+ degrees and to change the advance

you could buy a different coil(part#36605k) and that would advance it to 30 degrees.

 i was just hoping to get some verification from a older manual on how much advancement they run.

 

Engine1.gif



#12 Alc ONLINE  

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Posted January 01, 2018 - 08:40 AM

I've been following your thread and waiting to see what the factory was calling for . I have no clue myself though I would think a engine would be hard to start at 20-30 degrees before TDC so I'm guessing they run some kind of way to advance ? 


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#13 dodge trucker ONLINE  

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Posted January 01, 2018 - 10:33 AM

no these had no advance that varied while running other than the air cooled outboards.... (Ted Williams-- a Sears brand, Eska and a few others)

I have had several Tecumseh manuals over the years,  old and new, and all I have ever seen was the "thousandths of an inch before TDC" type of spec, never saw a degreed spec.... maybe beause you can't pull the flywheel while running and alter the setting?   Might have been some other source like maybe a go carting club magazine from back in the day, possibly?  I know that 0.030" before TDC is nowhere near 30* before TDC.



#14 delray OFFLINE  

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Posted January 01, 2018 - 11:06 AM

here you guys, small video i did after installing a tecumseh performance coil and degreeing the flywheel. you can see a small glips of the timing with the timing light.

 

Alc

 

would think a engine would be hard to start at 20-30 degrees before TDC

 

most cams also have compression relief, making it little easyer to pull over,except for some racing cams


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