Mf10 hh-100 ssi conversion...

Hello. I am trying to resurrect a mf10 garden tractor I got a while back. Everything seems to be here for it except the ssi coil, didn't notice that til I took the shroud off. Anyway I've read a bit about converting this over to have a 12v coil, ignition control module, a trigger switch(abs sensor), and a toggle switch to power the coil. But, I have read some other stuff about how there are two different hh-100 engines and some you can convert and some you cant???? And if this is a true statement about some you can and cant, how do you differentiate the two?

But my understanding of what I have gathered from online sources, the abs sensor basically picks up magnetic forces when the flywheel spins from the two(long/short) trigger pins, sending that signal threw the ignition control module, then to the coil to fire the spark plug, assuming you have the toggle switch on to give the coil 12v. I dont understand how some engines you can/cant do this on? And one other thing I'm confused about, would I need an alternator to charge the battery for this set-up?

Thanks mike
 
The basic home-made system involves some witing, a Ford F-150 brake sensor and a
GM HEI ignition spark module, and there are diagrams and parts list for that
do-it-yourself conversion for the NLA stock ignition system. There are also
sellers who have fully fabricated conversion systems that come with instructions.


You would need to figure out if the engine has a stator and a voltage regulator
because the ignition system is separate from the charging system.
 
I'd prefer the scattered truck part route, as if any future issues come up I'll already have it configured into my machine and the parts are cheap. if I just have to replace one at a time that is. Where that fancy gizmo some ppl made as a plug and play would be a whole new one if one piece goes out.

Anyway back to the machine, stator and voltage regulator..... locations for these parts... I believe the voltage regulator is a positive but not sure about the stator.
 
I think the 'some can't/Some can' issue is the early HH10s with starter generator had a magneto with ignition points. Somebody will correct me if I am wrong. but I am thinking the electronic ignition came later, after Tecumseh went to an alternator under the flywheel.

If the engine has a set of igntion points, it would be far easier to install a Delco (style) ignition coil (NAPA IC14 SB) and connect the negative to your points.

I never did this conversion myself. When I got the battery hooked up, solenoid installed and the engine spinning over, I happily had a spark at the plug wire from the old ignition module. So I don't know why the previous owner removed the flywheel shroud and then got rid of the tractor.

There was a video on Youtube by Donny Boy making that conversion that I liked. There were some others in the same vein, but his was the best. I have looked at some of his other videos and I think he knows his stuff.
 
I'd prefer the scattered truck part route, as if any future issues come up I'll already have it configured into my machine and the parts are cheap. if I just have to replace one at a time that is. Where that fancy gizmo some ppl made as a plug and play would be a whole new one if one piece goes out.

Anyway back to the machine, stator and voltage regulator..... locations for these parts... I believe a voltage regulator is there, but not sure about the stator.
 
Some of the early tecumseh rebranded lauson hh100 eng(late 60's-73) with a starter/generator did have solid state ign,they had a small generator coil mounted under flywheel & a small spark coil mounted on a Y bracket over the outside of flywheel where the later oem ssi coil mounts,I had 2 of these eng,they even had a cast cavity in block close to carb for points even though eng didn't have points,condenser & coil,some yrs later tecumseh changed style of block & did away with points cavity.Year's later when scrapping both eng I removed ign units from eng & stuffed in a box/put on a shelf in shed WITHOUT tagging them,about 10 yrs ago I was cleaing out shed & found box but couldn't remember what coils were for so I threw them out,several months later I saw same coils on ebay and the price for them(used)just about every week since then I'm kicking myself for not labeling coils,I don't know if you would call this hindsight/closeing the barn door after the horse is gone,either way it was a stupid mistake on my part.
 
If your eng has a ring gear flywheel,standard gear drive style starter then you will have an alt stator UNDER flywheel,if eng had an ssi module(large cast aluminum unit)mounted over flywheel there will also be a separate winding on alt stator to power this module,this is a GROUND KILL ign system,if you were to put +12v into the center pin of 3 prong connector that exits flywheel cover above starter motor and ssi module was still on eng you would instantly burn out ssi module in addition damaging/burning out coil on alt stator that powers ssi module,the 2 outside pins goto vr.

If your flywheel has ring gear & trigger pins it might be easier/quicker going to ebay and getting a used ssi unit,the down side is the cost($125-$250)the up side is you install coil with 2 bolts,set pin air gaps,tighten bilts & you're done,you don't have to spend time bird dogging parts,installing brackets and possibly replaceing ign sw/rewiring tractor.You might also want to goto ebay and buy a tecumseh eng service manual cd that has hh series eng on it,has all info you need to repair/rebuild eng.

If your mf10 is anything like the mf8(tecumseh hh80) I had years ago looking from front of tractor the vr was located on left side of hoodstand under battery holder bracket(hard to see/get to)I had to remove battery holder to get to vr.
 
As an on to last post,if you decide to go the used ssi module on ebay before going to ebay look over your flywheel cover VERY carefully as to where plug lead exits same,these modules had 3 different pn due to length of plug lead,short lead exited cover just above module,med length lead exited cover between center of module & left side of flywheel cover,long lead exited left side lip of flywheel cover thru a slotted hole with a rubber grommet on plug lead inserted into same then plug lead ran up between carb/flywheel cover across head to plug,if you get short leaded module you'll have to cut/drill flywheel cover for plug lead to exit(been there/done it).
 
Thanks for all the good info. But I gotta stop you on the ebay used ssi module for gold price and that's used. It could go bad as soon as I install and get it running or it could run for 20 years, who knows and that's why I'm not gambling 200plus bucks on that type of part. I'd rather get the brand new random truck parts to get my spark and make the brackets for the setup cuz once the brackets are made the components are readily available. But I totally under stand the ease part your driving. But I'm not in a rush to get it going, so making it easily repairable for the future is my goal.
 
mvphoto55523.jpg


mvphoto55524.jpg

Here are some photos of my engine.
 
mvphoto55526.jpg

Now this wire here??? Could this be coming from stator? I'm not real familiar with small engine stuff but I am above average when it comes to mechanical repairs so I can find my way around good with some pointers. Haha.
 
I see the threads are still shiny - that would indicate an SSI module
was removed relatively recently. Pictures of the other two sides of the
engine would help. You may still have a spot where points were or could
be located, probably under the carburetor and to the left.

Both my HH100 engines have the SSI module.
 
I actually just cleaned the dirt dobbers out of those holes. I ran a tap threw to clean the dirt out and of coarse used alot of pb blast while doing it so the dirt would run right out. But thanks for pointing out how nicely I cleaned them haha.
 
Looking at this pic the vr is clearly seen on bulkhead in addition to the 3 wires coming out of flywheel backplate,2 of these wires will goto terminals on vr usually the 2 outside terminals & the center terminal is B+(battery)the 3rd wire in pic is ign kill lead to grounding type ign sw.

The wire you're asking about in other pic is the lead from separate coil on alt stator to power ssi module,the quick disconnect terminal/tab connect to a threaded stud on ssi module.

Looking at pics of eng this eng/tractor has suffered a LOT of neglect,I wish you luck with same.
 
...wiring...
Yes, nice job (really nice job) on cleaning out the dirt daubers.
Your flywheel has those two little triggers for the electronic ignition.
The F150 ABS sensor also uses them, so the home-made ignition system
should work for you.
 
Ok so how do I wire the new parts into the wiring that is here already? I obviously need the voltage regulator for the stator to send a charge back to battery? Correct? I'm planning on doing the exact wiring plan as described in these two utube videos, "tecumseh hh100 solid state ignition system replacement 2" by big Mike's mower modification and "tecumseh hh100 high energy ignition upgrade" by shaws garage. Only these guys only show how they wired the new parts in, they didn't show anything about the stator or voltage regulator which is why I'm confused about how to wire them.
 
Is there a way to test the stator without removing the flywheel? Like these wires coming out and turning engine over, would I get a reading on a meter?
 
Get a well charged battery,remove spark plug,connect a volt meter to 2 stator leads,connect jumper cables to battery/eng,if eng spins easy you should read 6.5-7 VAC on stator leads if eng has a 10A alt(this is the most common)as far as vr connections 2 stator leads goto outside terminals,center term B+(battery) on vr connects to A(accessory) or B(battery)terminals on ign sw or + terminal on battery,either of the 3 connections will work to charge battery,that's as simple as it gets,if you don't
have the electrical knowledge/skills get help from someone who does as what you want to do is a HANDS ON job,1st thing YOU HAVE TO DO is get a wiring diagram of tractor to confirm orig factory wiring still exists on tractor.

If you really want to help yourself do a goggle search for yahoo groups garden tractors,if mf group is still listed/active click on link,join group & see if the can help you with wiring diag/any info you need.
 
I actually do have a manual for the tractor and I realized that the charging system and the ignition coil are separate systems. But the way I'm wanting to by-pass/convert the ssi coil I was a bit confused on the wiring cuz the ssi coil was getting power from the stator. I was just worried about buying all the stuff for this setup and needing to figure out a different setup for the charging system. But if this stator charges battery I should be good to go. I'll get on testing the stator.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top