Can anyone tell me the HP of a 99cc Mastercraft generator motor?

[freakincage]

Just like the title says. Yesterday on Kijiji, I picked up for free, a 1350W Mastercraft generator. It doesn't produce electrical power, so I thought that maybe this might be a suitable candidate for my Sears Roper. The motor just says 99cc...any idea on the HP of it? The ad says it's a 4HP, but I don't know how they would have known that.

 

[MancoGX390]

It looks like a ok motor but the big question is, does it have a tapered shaft? If it does you will have to change the crank. The only way to find out is to talk it apart.

 

[freakincage]

That is a great point. If it is tapered, I'll sell it. Any Idea on the HP? I already have a 2HP Briggs, but it won't be enough power for this mini bike.

 

[itsid]

the HP can be assumed.. if it's a 1350W generator the engine is most likely rated between 1800 and 2200 Watts that's (2.4 - 3 HP)
but you WILL find a sticker on the engine stating it's powerout in watts!
(just divide by 735.5 to get a HP value)
The shaft is the smallest problem I'm afraid..
most generators I've seen have a special crankcase cover.
So if you remove the generator, you'll end up buying a new crank case cover
(and that might turn out difficult to find )

but just see what you got, maybe it's just an ordinary straight shaft engine with an ordinary crank case cover

'sid

 

[freakincage]

Thanks for the input. This unit was free and it was on my way home from work so if it doesn't work out, I'm not out anything. I'll pull it apart in the next few days and see watts watt. That's right I'm punny. Thanks again.

 

[mckutzy]

Why not figure out what's wrong with the geny, sell that and get a 6.5?

 

[freakincage]

It smells like burnt electronics...I think the stator is fried. I'll do a bit more digging into it.

 

[Young One With A Manco]

I would recommend watching this whole series.https://m.youtube.com/watch?v=cJv54bAMx-E

It's 4 parts. No, this is not me.

 

[OzFab]

99cc are usually in the vicinity of 2-3hp, depending on age & make; there should be some indication on the starter shroud...

 

[joshkidner]

Check the brushes and for any corrosion! My grandma paid 500$ for a generator and her nor her husband could get it running. I finally got it running and it wouldn't produce electricity. I took the cover off, removed the brushes and cleaned the corrosion off and presto! If they are too worn you can get new brushes I believe 5-$10. They should be replaced every so many hours its ran anyways.

 

[freakincage]

Ok a little update. I traded the generator for a Honda GX-120. The guy didn't seem to care that the generator didn't work and I was happy to get a little nice running Honda motor. So that's the good. Now the bad. This motor was off of a water pump, when I first measured the shaft, I was like "A 5/8" shaft. Perfect clutches come in that size, I'll just cut in a key way." Upon further inspection, the shaft is metric. 18mm to be exact. So now I need to know, where do I get a clutch for this? I can get 3/4" clutches locally for $40. How do I get one of these to fit? Thanks in advance.

 

[Badot]

With 18mm being .709 inches I wonder if it's close enough that you can get away with using a wrap of .02" shim stock and a 3/4" clutch.

 

[mckutzy]

Im kinda amazed you got any reading worth wile on that shaft. Clean it up nice then measure it.

 

[freakincage]

Im kinda amazed you got any reading worth wile on that shaft. Clean it up nice then measure it.

I get what you're saying about the rust. The gx120 came with two shafts around the same size, 5/8" and 18mm. Being that 5/8" is pretty well 16mm and it miked at a hair over 18mm, I'm assuming its 18mm. I will clean it up and remike, but I'm fairly confident that there isn't 1mm of corrosion all around...but I've been wrong before.

With 18mm being .709 inches I wonder if it's close enough that you can get away with using a wrap of .02" shim stock and a 3/4" clutch.

I thought about using a shim but I don't know how it will work being that all the clutches I've seen have an integral key. If I could find one with a keyway, I could make a custom key specific for this application, or is the difference in diameter insignificant being that it's so little?

 

[itsid]

there even was a gx120 with a 3/4 shaft
at this time the ONLY shaft with an outer thread is a T type (and that is 5/8")
then ther's the metric 18mm (S Type) and the 3/4" (Q Type).. both inner thread.

I'm not sure what shafts were out of production, so it still can be nearly anything;
but chances are it's 5/8 T-Type

'sid

 

[freakincage]

Actually, there are a few shafts with outer threads. There's the U, P, T & W. I just cleaned the shaft up and I'm sure it's a W shaft. 18mm with a threaded area of 12.5mm. I can't seem to find the website now that had a link to the Honda brochure that lists all the various shafts the gx120 comes with. This motor is off of a water pump and the date sticker on the gas tank says it's from 2004. I don't know if that makes a difference.

EDIT:
Found the brochure and stuff.
http://www.mikeschainsawshop.co.nz/assets/Uploads/Documents/honda-engine-brochures/GX120-Brochure.pdf

 

[Badot]

If I could find one with a keyway, I could make a custom key specific for this application, or is the difference in diameter insignificant being that it's so little?

I believe a custom key would be necessary in that case. Looks like an 18mm shaft would use a 6mmx6mm key and 3/4" clutch would use a 3/16, meaning you'd just get a 6x6 key and grind it down. A little laborious but it should be functional. Or if you have access to a bench mill/machinist the key should be doable in about 30 seconds. So we're getting more practical here than a tapered shaft, just not by a whole lot.

 

[freakincage]

This motor doesn't have a key. Since I have to cut one in, it can be whatever I want. I also have access to machine tools. So if I understand correctly, the general concensus is, using a shim with a 3/4" clutch shouldn't be a big deal...right?

 

[Badot]

Ah, didn't realize that had a non-keyed shaft, but I see where you mentioned cutting a keyway.

 

[freakincage]

Does anyone see any issues in using a small shim to allow the use if a 3/4" clutch?