Rounded Blower Housing - HS40 - Modifications

[DesertG]

Hello Gentlemen, are you a Tecumseh expert? I have a mid-70s HS40 with the square looking blower housing. I have a Rupp 1972 blower housing that I want to install. Interestingly, its a points engine with a steel flywheel.

Do I need to change the flywheel and or starter cup to make this work. Thank you!

 

[massacre]

You might need a thin flywheel and corresponding starter cup. Hard to tell how thick the flywheel is from the pic.
you could bolt on the rounded shroud and see if there is interference?

 

[creia]

Read # 15 "Flywheel and Blower Housings" from this very informative article:
https://www.pinrepair.com/minibikes/tecumsehmb.htm
Credit for this excellent publication goes to fellow OldMiniBikes member cfh
Michael

 

[DesertG]

Read # 15 "Flywheel and Blower Housings" from this very informative article:
https://www.pinrepair.com/minibikes/tecumsehmb.htm
Credit for this excellent publication goes to fellow OldMiniBikes member cfh
Michael

Thank you. Yes, I just read that article and it was great. I sent him an email as I had a question. It was not clear to me what flywheel I need. He talks about converting a snowblower HS50, not an HS40. Looking on ebay, there are hundreds of flywheels. Not sure which one I need.

 

[Mark G]

This should help:

https://oldminibikes.com/forum/index.php?threads/back-dating-4hp-tecumseh.158404/

 

[DesertG]

This should help:

https://oldminibikes.com/forum/index.php?threads/back-dating-4hp-tecumseh.158404/

Thank you Mark for this post. I am not quite following. I have the old school housing already. I think I need a slim flywheel, but not sure which one. Thank you

 

[Skipp]

You’ll need the 32517 flywheel and a short cup to use the Rupp shroud….

 

[Mark Brooks]

@Skipp that's why I love this site, people help a brutha out!

 

[massacre]

Sorry, i put up the wrong part # for your application OP.
the correct info was posted below. My bad.

 

[DesertG]

If you want to, you could go with a #30755 and coil which would give you lights.

Thank you! I already have the lightning coil. I just need to find a nice straight flywheel

 

[DesertG]

You’ll need the 32517 flywheel and a short cup to use the Rupp shroud….

Thank you! I just need to find a nice straight one!

 

[Skipp]

@bobco usually has a few laying around

 

[Skipp]

Thank you! I already have the lightning coil. I just need to find a nice straight flywheel

The number I gave you is NOT the lighted one..

 

[DesertG]

The number I gave you is NOT the lighted one..

Thank you Skip. Not sure what you mean. Are you saying the 32517 won't fit over my existing points/condenser and lighting coil?

 

[Skipp]

Thank you Skip. Not sure what you mean. Are you saying the 32517 won't fit over my existing points/condenser and lighting coil?

That’s what I’m saying…
You’ll need the lighted flywheel….bobco should still have one….
32517 is NON-LIGHTED

 

[DesertG]

That’s what I’m saying…
You’ll need the lighted flywheel….bobco should still have one….
32517 is NON-LIGHTED

Thank you!

 

[DesertG]

If you want to, you could go with a #30755 and coil which would give you lights.

The number I gave you is NOT the lighted one..

Still not clear. Mark's article says Rupp used 32517. Thank you for this discussion!

 

[bobco]

OK, I guess it's time for me to chime in here, since this thread turned into a train wreck! If anyone would have looked at your 2nd picture in your initial posting, they would have seen the 3-prong lighting stator plug sticking out of the front of the engine. The good news is you have the correct round top 72 blower housing for the aluminum lighting flywheel with the studs and not screws to mount the recoil. The flywheel number you need is a 610769A or a 610869 from the 2-stroke AH817MB engine. Both of these flywheels have 12 magnets. The tapers are the same and so is the fin configuration. A 30755 number lighting flywheel is for the early H50 - H70 medium frame engines. The bad news is these flywheels are super hard to find. I may have one, but it's not $60 like a 32517. I hope this clears things up. Good Luck in your search.

 

[DesertG]

OK, I guess it's time for me to chime in here, since this thread turned into a train wreck! If anyone would have looked at your 2nd picture in your initial posting, they would have seen the 3-prong lighting stator plug sticking out of the front of the engine. The good news is you have the correct round top 72 blower housing for the aluminum lighting flywheel with the studs and not screws to mount the recoil. The flywheel number you need is a 610769A or a 610869 from the 2-stroke AH817MB engine. Both of these flywheels have 12 magnets. The tapers are the same and so is the fin configuration. A 30755 number lighting flywheel is for the early H50 - H70 medium frame engines. The bad news is these flywheels are super hard to find. I may have one, but it's not $60 like a 32517. I hope this clears things up. Good Luck in your search.

Thank you Bob!

 

[DesertG]

OK, I guess it's time for me to chime in here, since this thread turned into a train wreck! If anyone would have looked at your 2nd picture in your initial posting, they would have seen the 3-prong lighting stator plug sticking out of the front of the engine. The good news is you have the correct round top 72 blower housing for the aluminum lighting flywheel with the studs and not screws to mount the recoil. The flywheel number you need is a 610769A or a 610869 from the 2-stroke AH817MB engine. Both of these flywheels have 12 magnets. The tapers are the same and so is the fin configuration. A 30755 number lighting flywheel is for the early H50 - H70 medium frame engines. The bad news is these flywheels are super hard to find. I may have one, but it's not $60 like a 32517. I hope this clears things up. Good Luck in your search.

Bob, quick question. Why so much focus on the slim looking 32517 flywheel. What was this part used on..